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Posted to commits@poi.apache.org by ms...@apache.org on 2010/03/11 13:12:54 UTC
svn commit: r921819 [2/2] -
/poi/trunk/src/examples/src/org/apache/poi/hssf/usermodel/examples/AddDimensionedImage.java
Modified: poi/trunk/src/examples/src/org/apache/poi/hssf/usermodel/examples/AddDimensionedImage.java
URL: http://svn.apache.org/viewvc/poi/trunk/src/examples/src/org/apache/poi/hssf/usermodel/examples/AddDimensionedImage.java?rev=921819&r1=921818&r2=921819&view=diff
==============================================================================
--- poi/trunk/src/examples/src/org/apache/poi/hssf/usermodel/examples/AddDimensionedImage.java (original)
+++ poi/trunk/src/examples/src/org/apache/poi/hssf/usermodel/examples/AddDimensionedImage.java Thu Mar 11 12:12:54 2010
@@ -1,922 +1,943 @@
-/* ====================================================================
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements. See the NOTICE file distributed with
- this work for additional information regarding copyright ownership.
- The ASF licenses this file to You under the Apache License, Version 2.0
- (the "License"); you may not use this file except in compliance with
- the License. You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
-==================================================================== */
-
-
-package org.apache.poi.hssf.usermodel.examples;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.FileNotFoundException;
-import java.io.IOException;
-
-import org.apache.poi.hssf.usermodel.HSSFWorkbook;
-import org.apache.poi.hssf.usermodel.HSSFSheet;
-import org.apache.poi.hssf.usermodel.HSSFRow;
-import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
-import org.apache.poi.hssf.usermodel.HSSFPatriarch;
-import org.apache.poi.hssf.util.CellReference;
-
-
-/**
- * Demonstrates how to add an image to a worksheet and set that image's size
- * to a specific number of milimetres irrespective of the width of the columns
- * or height of the rows. Overridden methods are provided so that the location
- * of the image - the cells row and column co-ordinates that define the top
- * left hand corners of the image - can be identified either in the familiar
- * Excel manner - A1 for instance - or using POI's methodolody of a column and
- * row index where 0, 0 would indicate cell A1.
- *
- * The best way to make use of these techniques is to delay adding the image to
- * the sheet until all other work has been completed. That way, the sizes of
- * all rows and columns will have been adjusted - assuming that step was
- * necessary. Even though the anchors type is set to prevent the image moving
- * or re-sizing, this setting does not have any effect until the sheet is being
- * viewed using the Excel application.
- *
- * The key to the process is the HSSFClientAnchor class. It accepts eight
- * parameters that define, in order;
- *
- * * How far - in terms of co-ordinate position - the image should be inset
- * from the left hand border of a cell.
- * * How far - in terms of co-ordinate positions - the image should be inset
- * from the from the top of the cell.
- * * How far - in terms of co-ordinate positions - the right hand edge of
- * the image should protrude into a cell (measured from the cell's left hand
- * edge to the image's right hand edge).
- * * How far - in terms of co-ordinate positions - the bottm edge of the
- * image should protrude into a row (measured from the cell's top edge to
- * the image's bottom edge).
- * * The index of the column that contains the cell whose top left hand
- * corner should be aligned with the top left hand corner of the image.
- * * The index of the row that contains the cell whose top left hand corner
- * should be aligned with the image's top left hand corner.
- * * The index of the column that contains the cell whose top left hand
- * corner should be aligned with the image's bottom right hand corner
- * * The index number of the row that contains the cell whose top left
- * hand corner should be aligned with the images bottom right hand corner.
- *
- * It can be used to add an image into cell A1, for example, in the following
- * manner;
- *
- * HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0,
- * (short)0, 0, (short)1, 1);
- *
- * The final four parameters determine that the top left hand corner should be
- * aligned with the top left hand corner of cell A1 and it's bottom right
- * hand corner with the top left hand corner of cell B2. Think of the image as
- * being stretched so that it's top left hand corner is aligned with the top
- * left hand corner of cell A1 and it's bottom right hand corner is aligned with
- * the top left hand corner of cell B1. Interestingly, this would also produce
- * the same results;
- *
- * anchor = new HSSFClientAnchor(0, 0, 1023, 255,
- * (short)0, 0, (short)0, 0);
- *
- * Note that the final four parameters all contain the same value and seem to
- * indicate that the images top left hand corner is aligned with the top left
- * hand corner of cell A1 and that it's bottom right hand corner is also
- * aligned with the top left hand corner of cell A1. Yet, running this code
- * would see the image fully occupying cell A1. That is the result of the
- * values passed to parameters three and four; these I have referred to as
- * determing the images co-ordinates within the cell. They indicate that the
- * image should occupy - in order - the full width of the column and the full
- * height of the row.
- *
- * The co-ordinate values shown are the maxima; and they are independent of
- * row height/column width and of the font used. Passing 255 will always result
- * in the image occupying the full height of the row and passing 1023 will
- * always result in the image occupying the full width of the column. They help
- * in situations where an image is larger than a column/row and must overlap
- * into the next column/row. Using them does mean, however, that it is often
- * necessary to perform conversions between Excel's characters units, points,
- * pixels and millimetres in order to establish how many rows/columns an image
- * should occupy and just what the varous insets ought to be.
- *
- * Note that the first two parameters of the HSSFClientAchor classes constructor
- * are not made use of in the code that follows. It would be fairly trivial
- * however to extend these example further and provide methods that would centre
- * an image within a cell or allow the user to specify that a plain border a
- * fixed number of millimetres wide should wrap around the image. Those first
- * two parameters would make this sort of functionality perfectly possible.
- *
- * Owing to the various conversions used, the actual size of the image may vary
- * from that required; testing has so far found this to be in the region of
- * plus or minus two millimetres. Most likely by modifying the way the
- * calculations are performed - possibly using double(s) throughout and
- * rounding the values at the correct point - it is likely that these errors
- * could be reduced or removed.
- *
- * @author Mark Beardsley [msb at apache.org]
- * @version 1.00 5th August 2009.
- */
-public class AddDimensionedImage {
-
- // Four constants that determine how - and indeed whether - the rows
- // and columns an image may overlie should be expanded to accomodate that
- // image.
- // Passing EXPAND_ROW will result in the height of a row being increased
- // to accomodate the image if it is not already larger. The image will
- // be layed across one or more columns.
- // Passing EXPAND_COLUMN will result in the width of the column being
- // increased to accomodate the image if it is not already larger. The image
- // will be layed across one or many rows.
- // Passing EXPAND_ROW_AND_COLUMN will result in the height of the row
- // bing increased along with the width of the column to accomdate the
- // image if either is not already larger.
- // Passing OVERLAY_ROW_AND_COLUMN will result in the image being layed
- // over one or more rows and columns. No row or column will be resized,
- // instead, code will determine how many rows and columns the image should
- // overlie.
- public static final int EXPAND_ROW = 1;
- public static final int EXPAND_COLUMN = 2;
- public static final int EXPAND_ROW_AND_COLUMN = 3;
- public static final int OVERLAY_ROW_AND_COLUMN = 7;
-
- /**
- * Add an image to a worksheet.
- *
- * @param cellNumber A String that contains the location of the cell whose
- * top left hand corner should be aligned with the top
- * left hand corner of the image; for example "A1", "A2"
- * etc. This is to support the familiar Excel syntax.
- * Whilst images are are not actually inserted into cells
- * this provides a convenient method of indicating where
- * the image should be positioned on the sheet.
- * @param sheet A reference to the sheet that contains the cell referenced
- * above.
- * @param imageFile A String that encapsulates the name of and path to
- * the image that is to be 'inserted into' the sheet.
- * @param reqImageWidthMM A primitive double that contains the required
- * width of the image in millimetres.
- * @param reqImageHeightMM A primitive double that contains the required
- * height of the image in millimetres.
- * @param resizeBehaviour A primitive int whose value will determine how
- * the code should react if the image is larger than
- * the cell referenced by the cellNumber parameter.
- * Four constants are provided to determine what
- * should happen;
- * AddDimensionedImage.EXPAND_ROW
- * AddDimensionedImage.EXPAND_COLUMN
- * AddDimensionedImage.EXPAND_ROW_AND_COLUMN
- * AddDimensionedImage.OVERLAY_ROW_AND_COLUMN
- * @throws java.io.FileNotFoundException If the file containing the image
- * cannot be located.
- * @throws java.io.IOException If a problem occurs whilst reading the file
- * of image data.
- * @throws java.lang.IllegalArgumentException If an invalid value is passed
- * to the resizeBehaviour
- * parameter.
- */
- public void addImageToSheet(String cellNumber, HSSFSheet sheet,
- String imageFile, double reqImageWidthMM, double reqImageHeightMM,
- int resizeBehaviour) throws FileNotFoundException, IOException,
- IllegalArgumentException {
- // Convert the String into column and row indices then chain the
- // call to the overridden addImageToSheet() method.
- CellReference cellRef = new CellReference(cellNumber);
- this.addImageToSheet(cellRef.getCol(), cellRef.getRow(), sheet,
- imageFile, reqImageWidthMM, reqImageHeightMM,resizeBehaviour);
- }
-
- /**
- * Add an image to a worksheet.
- *
- * @param colNumber A primitive int that contains the index number of a
- * column on the worksheet; POI column indices are zero
- * based. Together with the rowNumber parameter's value,
- * this parameter identifies a cell on the worksheet. The
- * image's top left hand corner will be aligned with the
- * top left hand corner of this cell.
- * @param rowNumber A primtive int that contains the index number of a row
- * on the worksheet; POI row indices are zero based.
- * Together with the rowNumber parameter's value, this
- * parameter identifies a cell on the worksheet. The
- * image's top left hand corner will be aligned with the
- * top left hand corner of this cell.
- * @param sheet A reference to the sheet that contains the cell identified
- * by the two parameters above.
- * @param imageFile A String that encapsulates the name of and path to
- * the image that is to be 'inserted into' the sheet.
- * @param reqImageWidthMM A primitive double that contains the required
- * width of the image in millimetres.
- * @param reqImageHeightMM A primitive double that contains the required
- * height of the image in millimetres.
- * @param resizeBehaviour A primitive int whose value will determine how
- * the code should react if the image is larger than
- * the cell referenced by the colNumber and
- * rowNumber parameters. Four constants are provided
- * to determine what should happen;
- * AddDimensionedImage.EXPAND_ROW
- * AddDimensionedImage.EXPAND_COLUMN
- * AddDimensionedImage.EXPAND_ROW_AND_COLUMN
- * AddDimensionedImage.OVERLAY_ROW_AND_COLUMN
- * @throws java.io.FileNotFoundException If the file containing the image
- * cannot be located.
- * @throws java.io.IOException If a problem occurs whilst reading the file
- * of image data.
- * @throws java.lang.IllegalArgumentException If an invalid value is passed
- * to the resizeBehaviour
- * parameter.
- */
- private void addImageToSheet(int colNumber, int rowNumber, HSSFSheet sheet,
- String imageFile, double reqImageWidthMM, double reqImageHeightMM,
- int resizeBehaviour) throws FileNotFoundException, IOException,
- IllegalArgumentException {
- HSSFClientAnchor anchor = null;
- HSSFPatriarch patriarch = null;
- ClientAnchorDetail rowClientAnchorDetail = null;
- ClientAnchorDetail colClientAnchorDetail = null;
-
- // Validate the resizeBehaviour parameter.
- if((resizeBehaviour != AddDimensionedImage.EXPAND_COLUMN) &&
- (resizeBehaviour != AddDimensionedImage.EXPAND_ROW) &&
- (resizeBehaviour != AddDimensionedImage.EXPAND_ROW_AND_COLUMN) &&
- (resizeBehaviour != AddDimensionedImage.OVERLAY_ROW_AND_COLUMN)) {
- throw new IllegalArgumentException("Invalid value passed to the " +
- "resizeBehaviour parameter of AddDimensionedImage.addImageToSheet()");
- }
-
- // Call methods to calculate how the image and sheet should be
- // manipulated to accomodate the image; columns and then rows.
- colClientAnchorDetail = this.fitImageToColumns(sheet, colNumber,
- reqImageWidthMM, resizeBehaviour);
- rowClientAnchorDetail = this.fitImageToRows(sheet, rowNumber,
- reqImageHeightMM, resizeBehaviour);
-
- // Having determined if and how to resize the rows, columns and/or the
- // image, create the HSSFClientAnchor object to position the image on
- // the worksheet. Note how the two ClientAnchorDetail records are
- // interrogated to recover the row/column co-ordinates and any insets.
- // The first two parameters are not used currently but could be if the
- // need arose to extend the functionality of this code by adding the
- // ability to specify that a clear 'border' be placed around the image.
- anchor = new HSSFClientAnchor(0,
- 0,
- colClientAnchorDetail.getInset(),
- rowClientAnchorDetail.getInset(),
- (short)colClientAnchorDetail.getFromIndex(),
- rowClientAnchorDetail.getFromIndex(),
- (short)colClientAnchorDetail.getToIndex(),
- rowClientAnchorDetail.getToIndex());
-
- // For now, set the anchor type to do not move or resize the
- // image as the size of the row/column is adjusted. This could easilly
- // become another parameter passed to the method.
- anchor.setAnchorType(HSSFClientAnchor.DONT_MOVE_AND_RESIZE);
-
- // Now, add the picture to the workbook. Note that the type is assumed
- // to be a JPEG/JPG, this could easily (and should) be parameterised
- // however.
- int index = sheet.getWorkbook().addPicture(this.imageToBytes(imageFile),
- HSSFWorkbook.PICTURE_TYPE_JPEG);
-
- // Get the drawing patriarch and create the picture.
- patriarch = sheet.createDrawingPatriarch();
- patriarch.createPicture(anchor, index);
- }
-
- /**
- * Determines whether the sheets columns should be re-sized to accomodate
- * the image, adjusts the columns width if necessary and creates then
- * returns a ClientAnchorDetail object that facilitates construction of
- * an HSSFClientAnchor that will fix the image on the sheet and establish
- * it's size.
- *
- * @param sheet A reference to the sheet that will 'contain' the image.
- * @param colNumber A primtive int that contains the index number of a
- * column on the sheet.
- * @param reqImageWidthMM A primtive double that contains the required
- * width of the image in millimetres
- * @param resizeBehaviour A primitve int whose value will indicate how the
- * width of the column should be adjusted if the
- * required width of the image is greater than the
- * width of the column.
- * @return An instance of the ClientAnchorDetail class that will contain
- * the index number of the column containing the cell whose top
- * left hand corner also defines the top left hand corner of the
- * image, the index number column containing the cell whose top
- * left hand corner also defines the bottom right hand corner of
- * the image and an inset that determines how far the right hand
- * edge of the image can protrude into the next column - expressed
- * as a specific number of co-ordinate positions.
- */
- private ClientAnchorDetail fitImageToColumns(HSSFSheet sheet, int colNumber,
- double reqImageWidthMM, int resizeBehaviour) {
-
- double colWidthMM = 0.0D;
- double colCoordinatesPerMM = 0.0D;
- int pictureWidthCoordinates = 0;
- ClientAnchorDetail colClientAnchorDetail = null;
-
- // Get the colum's width in millimetres
- colWidthMM = ConvertImageUnits.widthUnits2Millimetres(
- (short)sheet.getColumnWidth(colNumber));
-
- // Check that the column's width will accomodate the image at the
- // required dimension. If the width of the column is LESS than the
- // required width of the image, decide how the application should
- // respond - resize the column or overlay the image across one or more
- // columns.
- if(colWidthMM < reqImageWidthMM) {
-
- // Should the column's width simply be expanded?
- if((resizeBehaviour == AddDimensionedImage.EXPAND_COLUMN) ||
- (resizeBehaviour == AddDimensionedImage.EXPAND_ROW_AND_COLUMN)) {
- // Set the width of the column by converting the required image
- // width from millimetres into Excel's column width units.
- sheet.setColumnWidth(colNumber,
- ConvertImageUnits.millimetres2WidthUnits(reqImageWidthMM));
- // To make the image occupy the full width of the column, convert
- // the required width of the image into co-ordinates. This value
- // will become the inset for the ClientAnchorDetail class that
- // is then instantiated.
- colWidthMM = reqImageWidthMM;
- colCoordinatesPerMM = ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS /
- colWidthMM;
- pictureWidthCoordinates = (int)(reqImageWidthMM * colCoordinatesPerMM);
- colClientAnchorDetail = new ClientAnchorDetail(colNumber,
- colNumber, pictureWidthCoordinates);
- }
- // If the user has chosen to overlay both rows and columns or just
- // to expand ONLY the size of the rows, then calculate how to lay
- // the image out across one or more columns.
- else if ((resizeBehaviour == AddDimensionedImage.OVERLAY_ROW_AND_COLUMN) ||
- (resizeBehaviour == AddDimensionedImage.EXPAND_ROW)) {
- colClientAnchorDetail = this.calculateColumnLocation(sheet,
- colNumber, reqImageWidthMM);
- }
- }
- // If the column is wider than the image.
- else {
- // Mow many co-ordinate positions are there per millimetre?
- colCoordinatesPerMM = ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS /
- colWidthMM;
- // Given the width of the image, what should be it's co-ordinate?
- pictureWidthCoordinates = (int)(reqImageWidthMM * colCoordinatesPerMM);
- colClientAnchorDetail = new ClientAnchorDetail(colNumber,
- colNumber, pictureWidthCoordinates);
- }
- return(colClientAnchorDetail);
- }
-
- /**
- * Determines whether the sheet's row should be re-sized to accomodate
- * the image, adjusts the rows height if necessary and creates then
- * returns a ClientAnchorDetail object that facilitates construction of
- * an HSSFClientAnchor that will fix the image on the sheet and establish
- * it's size.
- *
- * @param sheet A reference to the sheet that will 'contain' the image.
- * @param rowNumber A primtive int that contains the index number of a
- * row on the sheet.
- * @param reqImageHeightMM A primtive double that contains the required
- * height of the image in millimetres
- * @param resizeBehaviour A primitve int whose value will indicate how the
- * height of the row should be adjusted if the
- * required height of the image is greater than the
- * height of the row.
- * @return An instance of the ClientAnchorDetail class that will contain
- * the index number of the row containing the cell whose top
- * left hand corner also defines the top left hand corner of the
- * image, the index number of the row containing the cell whose
- * top left hand corner also defines the bottom right hand
- * corner of the image and an inset that determines how far the
- * bottom edge of the image can protrude into the next (lower)
- * row - expressed as a specific number of co-ordinate positions.
- */
- private ClientAnchorDetail fitImageToRows(HSSFSheet sheet, int rowNumber,
- double reqImageHeightMM, int resizeBehaviour) {
- HSSFRow row = null;
- double rowHeightMM = 0.0D;
- double rowCoordinatesPerMM = 0.0D;
- int pictureHeightCoordinates = 0;
- ClientAnchorDetail rowClientAnchorDetail = null;
-
- // Get the row and it's height
- row = sheet.getRow(rowNumber);
- if(row == null) {
- // Create row if it does not exist.
- row = sheet.createRow(rowNumber);
- }
-
- // Get the row's height in millimetres
- rowHeightMM = row.getHeightInPoints() / ConvertImageUnits.POINTS_PER_MILLIMETRE;
-
- // Check that the row's height will accomodate the image at the required
- // dimensions. If the height of the row is LESS than the required height
- // of the image, decide how the application should respond - resize the
- // row or overlay the image across a series of rows.
- if(rowHeightMM < reqImageHeightMM) {
- if((resizeBehaviour == AddDimensionedImage.EXPAND_ROW) ||
- (resizeBehaviour == AddDimensionedImage.EXPAND_ROW_AND_COLUMN)) {
- row.setHeightInPoints((float)(reqImageHeightMM *
- ConvertImageUnits.POINTS_PER_MILLIMETRE));
- rowHeightMM = reqImageHeightMM;
- rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS /
- rowHeightMM;
- pictureHeightCoordinates = (int)(reqImageHeightMM * rowCoordinatesPerMM);
- rowClientAnchorDetail = new ClientAnchorDetail(rowNumber,
- rowNumber, pictureHeightCoordinates);
- }
- // If the user has chosen to overlay both rows and columns or just
- // to expand ONLY the size of the columns, then calculate how to lay
- // the image out ver one or more rows.
- else if((resizeBehaviour == AddDimensionedImage.OVERLAY_ROW_AND_COLUMN) ||
- (resizeBehaviour == AddDimensionedImage.EXPAND_COLUMN)) {
- rowClientAnchorDetail = this.calculateRowLocation(sheet,
- rowNumber, reqImageHeightMM);
- }
- }
- // Else, if the image is smaller than the space available
- else {
- rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS /
- rowHeightMM;
- pictureHeightCoordinates = (int)(reqImageHeightMM * rowCoordinatesPerMM);
- rowClientAnchorDetail = new ClientAnchorDetail(rowNumber,
- rowNumber, pictureHeightCoordinates);
- }
- return(rowClientAnchorDetail);
- }
-
- /**
- * If the image is to overlie more than one column, calculations need to be
- * performed to determine how many columns and whether the image will
- * overlie just a part of one column in order to be presented at the
- * required size.
- *
- * @param sheet The sheet that will 'contain' the image.
- * @param startingColumn A primitive int whose value is the index of the
- * column that contains the cell whose top left hand
- * corner should be aligned with the top left hand
- * corner of the image.
- * @param reqImageWidthMM A primitive double whose value will indicate the
- * required width of the image in millimetres.
- * @return An instance of the ClientAnchorDetail class that will contain
- * the index number of the column containing the cell whose top
- * left hand corner also defines the top left hand corner of the
- * image, the index number column containing the cell whose top
- * left hand corner also defines the bottom right hand corner of
- * the image and an inset that determines how far the right hand
- * edge of the image can protrude into the next column - expressed
- * as a specific number of co-ordinate positions.
- */
- private ClientAnchorDetail calculateColumnLocation(HSSFSheet sheet,
- int startingColumn,
- double reqImageWidthMM) {
- ClientAnchorDetail anchorDetail = null;
- double totalWidthMM = 0.0D;
- double colWidthMM = 0.0D;
- double overlapMM = 0.0D;
- double coordinatePositionsPerMM = 0.0D;
- int toColumn = startingColumn;
- int inset = 0;
-
- // Calculate how many columns the image will have to
- // span in order to be presented at the required size.
- while(totalWidthMM < reqImageWidthMM) {
- colWidthMM = ConvertImageUnits.widthUnits2Millimetres(
- (short)(sheet.getColumnWidth(toColumn)));
- // Note use of the cell border width constant. Testing with an image
- // declared to fit exactly into one column demonstrated that it's
- // width was greater than the width of the column the POI returned.
- // Further, this difference was a constant value that I am assuming
- // related to the cell's borders. Either way, that difference needs
- // to be allowed for in this calculation.
- totalWidthMM += (colWidthMM + ConvertImageUnits.CELL_BORDER_WIDTH_MILLIMETRES);
- toColumn++;
- }
- // De-crement by one the last column value.
- toColumn--;
- // Highly unlikely that this will be true but, if the width of a series
- // of columns is exactly equal to the required width of the image, then
- // simply build a ClientAnchorDetail object with an inset equal to the
- // total number of co-ordinate positions available in a column, a
- // from column co-ordinate (top left hand corner) equal to the value
- // of the startingColumn parameter and a to column co-ordinate equal
- // to the toColumn variable.
- //
- // Convert both values to ints to perform the test.
- if((int)totalWidthMM == (int)reqImageWidthMM) {
- // A problem could occur if the image is sized to fit into one or
- // more columns. If that occurs, the value in the toColumn variable
- // will be in error. To overcome this, there are two options, to
- // ibcrement the toColumn variable's value by one or to pass the
- // total number of co-ordinate positions to the third paramater
- // of the ClientAnchorDetail constructor. For no sepcific reason,
- // the latter option is used below.
- anchorDetail = new ClientAnchorDetail(startingColumn,
- toColumn, ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS);
- }
- // In this case, the image will overlap part of another column and it is
- // necessary to calculate just how much - this will become the inset
- // for the ClientAnchorDetail object.
- else {
- // Firstly, claculate how much of the image should overlap into
- // the next column.
- overlapMM = reqImageWidthMM - (totalWidthMM - colWidthMM);
-
- // When the required size is very close indded to the column size,
- // the calcaulation above can produce a negative value. To prevent
- // problems occuring in later caculations, this is simply removed
- // be setting the overlapMM value to zero.
- if(overlapMM < 0) {
- overlapMM = 0.0D;
- }
-
- // Next, from the columns width, calculate how many co-ordinate
- // positons there are per millimetre
- coordinatePositionsPerMM = ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS /
- colWidthMM;
- // From this figure, determine how many co-ordinat positions to
- // inset the left hand or bottom edge of the image.
- inset = (int)(coordinatePositionsPerMM * overlapMM);
-
- // Now create the ClientAnchorDetail object, setting the from and to
- // columns and the inset.
- anchorDetail = new ClientAnchorDetail(startingColumn, toColumn, inset);
- }
- return(anchorDetail);
- }
-
- /**
- * If the image is to overlie more than one rows, calculations need to be
- * performed to determine how many rows and whether the image will
- * overlie just a part of one row in order to be presented at the
- * required size.
- *
- * @param sheet The sheet that will 'contain' the image.
- * @param startingRow A primitive int whose value is the index of the row
- * that contains the cell whose top left hand corner
- * should be aligned with the top left hand corner of
- * the image.
- * @param reqImageHeightMM A primitive double whose value will indicate the
- * required height of the image in millimetres.
- * @return An instance of the ClientAnchorDetail class that will contain
- * the index number of the row containing the cell whose top
- * left hand corner also defines the top left hand corner of the
- * image, the index number of the row containing the cell whose top
- * left hand corner also defines the bottom right hand corner of
- * the image and an inset that determines how far the bottom edge
- * can protrude into the next (lower) row - expressed as a specific
- * number of co-ordinate positions.
- */
- private ClientAnchorDetail calculateRowLocation(HSSFSheet sheet,
- int startingRow, double reqImageHeightMM) {
- ClientAnchorDetail clientAnchorDetail = null;
- HSSFRow row = null;
- double rowHeightMM = 0.0D;
- double totalRowHeightMM = 0.0D;
- double overlapMM = 0.0D;
- double rowCoordinatesPerMM = 0.0D;
- int toRow = startingRow;
- int inset = 0;
-
- // Step through the rows in the sheet and accumulate a total of their
- // heights.
- while(totalRowHeightMM < reqImageHeightMM) {
- row = sheet.getRow(toRow);
- // Note, if the row does not already exist on the sheet then create
- // it here.
- if(row == null) {
- row = sheet.createRow(toRow);
- }
- // Get the row's height in millimetres and add to the running total.
- rowHeightMM = row.getHeightInPoints() /
- ConvertImageUnits.POINTS_PER_MILLIMETRE;
- totalRowHeightMM += rowHeightMM;
- toRow++;
- }
- // Owing to the way the loop above works, the rowNumber will have been
- // incremented one row too far. Undo that here.
- toRow--;
- // Check to see whether the image should occupy an exact number of
- // rows. If so, build the ClientAnchorDetail record to point
- // to those rows and with an inset of the total number of co-ordinate
- // position in the row.
- //
- // To overcome problems that can occur with comparing double values for
- // equality, cast both to int(s) to truncate the value; VERY crude and
- // I do not really like it!!
- if((int)totalRowHeightMM == (int)reqImageHeightMM) {
- clientAnchorDetail = new ClientAnchorDetail(startingRow, toRow,
- ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS);
- }
- else {
- // Calculate how far the image will project into the next row. Note
- // that the height of the last row assessed is subtracted from the
- // total height of all rows assessed so far.
- overlapMM = reqImageHeightMM - (totalRowHeightMM - rowHeightMM);
-
- // To prevent an exception being thrown when the required width of
- // the image is very close indeed to the column size.
- if(overlapMM < 0) {
- overlapMM = 0.0D;
- }
-
- rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS /
- rowHeightMM;
- inset = (int)(overlapMM * rowCoordinatesPerMM);
- clientAnchorDetail = new ClientAnchorDetail(startingRow,
- toRow, inset);
- }
- return(clientAnchorDetail);
- }
-
- /**
- * Loads - reads in and converts into an array of byte(s) - an image from
- * a named file.
- *
- * Note: this method should be modified so that the type of the image may
- * also be passed to it. Currently, it assumes that all images are
- * JPG/JPEG(s).
- *
- * @param imageFilename A String that encapsulates the path to and name
- * of the file that contains the image which is to be
- * 'loaded'.
- * @return An array of type byte that contains the raw data of the named
- * image.
- * @throws java.io.FileNotFoundException Thrown if it was not possible to
- * open the specified file.
- * @throws java.io.IOException Thrown if reading the file failed or was
- * interrupted.
- */
- private byte[] imageToBytes(String imageFilename)
- throws FileNotFoundException, IOException {
- File imageFile = null;
- FileInputStream fis = null;
- ByteArrayOutputStream bos = null;
- int read = 0;
- try {
- imageFile = new File(imageFilename);
- fis = new FileInputStream(imageFile);
- bos = new ByteArrayOutputStream();
- while((read = fis.read()) != -1) {
- bos.write(read);
- }
- return(bos.toByteArray());
- }
- finally {
- if(fis != null) {
- try {
- fis.close();
- fis = null;
- }
- catch(IOException ioEx) {
- // Nothing to do here
- }
- }
- }
- }
-
- /**
- * The main entry point to the program. It contains code that demonstrates
- * one way to use the program.
- *
- * Note, the code is not restricted to use on new workbooks only. If an
- * image is to be inserted into an existing workbook. just open that
- * workbook, gat a reference to a sheet and pass that;
- *
- * AddDimensionedImage addImage = new AddDimensionedImage();
- *
- * File file = new File("....... Existing Workbook .......");
- * FileInputStream fis = new FileInputStream(file);
- * HSSFWorkbook workbook = new HSSFWorkbook(fis);
- * HSSFSheet sheet = workbook.getSheetAt(0);
- * addImage.addImageToSheet("C3", sheet, "image.jpg", 30, 20,
- * AddDimensionedImage.EXPAND.ROW);
- *
- * @param args the command line arguments
- */
- public static void main(String[] args) {
- FileOutputStream fos = null;
- HSSFWorkbook workbook = null;
- HSSFSheet sheet = null;
- try {
- workbook = new HSSFWorkbook();
- sheet = workbook.createSheet("Picture Test");
- new AddDimensionedImage().addImageToSheet("B5", sheet,
- "image.jpg", 25, 25,
- AddDimensionedImage.OVERLAY_ROW_AND_COLUMN);
- fos = new FileOutputStream("Workbook.xls");
- workbook.write(fos);
- }
- catch(FileNotFoundException fnfEx) {
- System.out.println("Caught an: " + fnfEx.getClass().getName());
- System.out.println("Message: " + fnfEx.getMessage());
- System.out.println("Stacktrace follows...........");
- fnfEx.printStackTrace(System.out);
- }
- catch(IOException ioEx) {
- System.out.println("Caught an: " + ioEx.getClass().getName());
- System.out.println("Message: " + ioEx.getMessage());
- System.out.println("Stacktrace follows...........");
- ioEx.printStackTrace(System.out);
- }
- finally {
- if(fos != null) {
- try {
- fos.close();
- fos = null;
- }
- catch(IOException ioEx) {
- // I G N O R E
- }
- }
- }
- }
-
- /**
- * The HSSFClientAnchor class accepts eight parameters. In order, these are;
- *
- * * How far the left hand edge of the image is inset from the left hand
- * edge of the cell
- * * How far the top edge of the image is inset from the top of the cell
- * * How far the right hand edge of the image is inset from the left
- * hand edge of the cell
- * * How far the bottom edge of the image is inset from the top of the
- * cell.
- * * Together, parameters five and six determine the column and row
- * co-ordinates of the cell whose top left hand corner will be aligned
- * with the image's top left hand corner.
- * * Together, parameter seven and eight determine the column and row
- * co-ordinates of the cell whose top left hand corner will be aligned
- * with the images bottom right hand corner.
- *
- * An instance of the ClientAnchorDetail class provides three of the eight
- * parameters, one of the co-ordinates for the images top left hand corner,
- * one of the co-ordinates for the images bottom right hand corner and
- * either how far the image should be inset from the top or the left hand
- * edge of the cell.
- *
- * @author Mark Beardsley [msb at apache.org]
- * @version 1.00 5th August 2009.
- */
- public class ClientAnchorDetail {
-
- public int fromIndex = 0;
- public int toIndex = 0;
- public int inset = 0;
-
- /**
- * Create a new instance of the ClientAnchorDetail class using the
- * following parameters.
- *
- * @param fromIndex A primitive int that contains one of the
- * co-ordinates (row or column index) for the top left
- * hand corner of the image.
- * @param toIndex A primitive int that contains one of the
- * co-ordinates (row or column index) for the bottom
- * right hand corner of the image.
- * @param inset A primitive int that contains a value which indicates
- * how far the image should be inset from the top or the
- * left hand edge of a cell.
- */
- public ClientAnchorDetail(int fromIndex, int toIndex, int inset) {
- this.fromIndex = fromIndex;
- this.toIndex = toIndex;
- this.inset = inset;
- }
-
- /**
- * Get one of the number of the column or row that contains the cell
- * whose top left hand corner will be aligned with the top left hand
- * corner of the image.
- *
- * @return The value - row or column index - for one of the co-ordinates
- * of the top left hand corner of the image.
- */
- public int getFromIndex() {
- return(this.fromIndex);
- }
-
- /**
- * Get one of the number of the column or row that contains the cell
- * whose top left hand corner will be aligned with the bottom righ hand
- * corner of the image.
- *
- * @return The value - row or column index - for one of the co-ordinates
- * of the bottom right hand corner of the image.
- */
- public int getToIndex() {
- return(this.toIndex);
- }
-
- /**
- * Get the image's offset from the edge of a cell.
- *
- * @return How far either the right hand or bottom edge of the image is
- * inset from the left hand or top edge of a cell.
- */
- public int getInset() {
- return(this.inset);
- }
- }
-
- /**
- * Utility methods used to convert Excel's character based column and row
- * size measurements into pixels and/or millimetres. The class also contains
- * various constants that are required in other calculations.
- *
- * @author xio[darjino@hotmail.com]
- * @version 1.01 30th July 2009.
- * Added by Mark Beardsley [msb at apache.org].
- * Additional constants.
- * widthUnits2Millimetres() and millimetres2Units() methods.
- */
- public static class ConvertImageUnits {
-
- // Each cell conatins a fixed number of co-ordinate points; this number
- // does not vary with row height or column width or with font. These two
- // constants are defined below.
- public static final int TOTAL_COLUMN_COORDINATE_POSITIONS = 1023; // MB
- public static final int TOTAL_ROW_COORDINATE_POSITIONS = 255; // MB
- // The resoultion of an image can be expressed as a specific number
- // of pixels per inch. Displays and printers differ but 96 pixels per
- // inch is an acceptable standard to beging with.
- public static final int PIXELS_PER_INCH = 96; // MB
- // Cnstants that defines how many pixels and points there are in a
- // millimetre. These values are required for the conversion algorithm.
- public static final double PIXELS_PER_MILLIMETRES = 3.78; // MB
- public static final double POINTS_PER_MILLIMETRE = 2.83; // MB
- // The column width returned by HSSF and the width of a picture when
- // positioned to exactly cover one cell are different by almost exactly
- // 2mm - give or take rounding errors. This constant allows that
- // additional amount to be accounted for when calculating how many
- // celles the image ought to overlie.
- public static final double CELL_BORDER_WIDTH_MILLIMETRES = 2.0D; // MB
- public static final short EXCEL_COLUMN_WIDTH_FACTOR = 256;
- public static final int UNIT_OFFSET_LENGTH = 7;
- public static final int[] UNIT_OFFSET_MAP = new int[]
- { 0, 36, 73, 109, 146, 182, 219 };
-
- /**
- * pixel units to excel width units(units of 1/256th of a character width)
- * @param pxs
- * @return
- */
- public static short pixel2WidthUnits(int pxs) {
- short widthUnits = (short) (EXCEL_COLUMN_WIDTH_FACTOR *
- (pxs / UNIT_OFFSET_LENGTH));
- widthUnits += UNIT_OFFSET_MAP[(pxs % UNIT_OFFSET_LENGTH)];
- return widthUnits;
- }
-
- /**
- * excel width units(units of 1/256th of a character width) to pixel
- * units.
- *
- * @param widthUnits
- * @return
- */
- public static int widthUnits2Pixel(short widthUnits) {
- int pixels = (widthUnits / EXCEL_COLUMN_WIDTH_FACTOR)
- * UNIT_OFFSET_LENGTH;
- int offsetWidthUnits = widthUnits % EXCEL_COLUMN_WIDTH_FACTOR;
- pixels += Math.round(offsetWidthUnits /
- ((float) EXCEL_COLUMN_WIDTH_FACTOR / UNIT_OFFSET_LENGTH));
- return pixels;
- }
-
- /**
- * Convert Excel's width units into millimetres.
- *
- * @param widthUnits The width of the column or the height of the
- * row in Excel's units.
- * @return A primitive double that contains the columns width or rows
- * height in millimetres.
- */
- public static double widthUnits2Millimetres(short widthUnits) {
- return(ConvertImageUnits.widthUnits2Pixel(widthUnits) /
- ConvertImageUnits.PIXELS_PER_MILLIMETRES);
- }
-
- /**
- * Convert into millimetres Excel's width units..
- *
- * @param millimetres A primitive double that contains the columns
- * width or rows height in millimetres.
- * @return A primitive int that contains the columns width or rows
- * height in Excel's units.
- */
- public static int millimetres2WidthUnits(double millimetres) {
- return(ConvertImageUnits.pixel2WidthUnits((int)(millimetres *
- ConvertImageUnits.PIXELS_PER_MILLIMETRES)));
- }
- }
-}
+/* ====================================================================
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+==================================================================== */
+
+
+package org.apache.poi.hssf.usermodel.examples;
+
+package bookfromtemplate;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.hssf.usermodel.HSSFSheet;
+import org.apache.poi.hssf.usermodel.HSSFRow;
+import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
+import org.apache.poi.hssf.usermodel.HSSFPatriarch;
+import org.apache.poi.hssf.util.CellReference;
+
+
+/**
+ * Demonstrates how to add an image to a worksheet and set that image's size
+ * to a specific number of milimetres irrespective of the width of the columns
+ * or height of the rows. Overridden methods are provided so that the location
+ * of the image - the cells row and column co-ordinates that define the top
+ * left hand corners of the image - can be identified either in the familiar
+ * Excel manner - A1 for instance - or using POI's methodolody of a column and
+ * row index where 0, 0 would indicate cell A1.
+ *
+ * The best way to make use of these techniques is to delay adding the image to
+ * the sheet until all other work has been completed. That way, the sizes of
+ * all rows and columns will have been adjusted - assuming that step was
+ * necessary. Even though the anchors type is set to prevent the image moving
+ * or re-sizing, this setting does not have any effect until the sheet is being
+ * viewed using the Excel application.
+ *
+ * The key to the process is the HSSFClientAnchor class. It accepts eight
+ * parameters that define, in order;
+ *
+ * * How far - in terms of co-ordinate position - the image should be inset
+ * from the left hand border of a cell.
+ * * How far - in terms of co-ordinate positions - the image should be inset
+ * from the from the top of the cell.
+ * * How far - in terms of co-ordinate positions - the right hand edge of
+ * the image should protrude into a cell (measured from the cell's left hand
+ * edge to the image's right hand edge).
+ * * How far - in terms of co-ordinate positions - the bottm edge of the
+ * image should protrude into a row (measured from the cell's top edge to
+ * the image's bottom edge).
+ * * The index of the column that contains the cell whose top left hand
+ * corner should be aligned with the top left hand corner of the image.
+ * * The index of the row that contains the cell whose top left hand corner
+ * should be aligned with the image's top left hand corner.
+ * * The index of the column that contains the cell whose top left hand
+ * corner should be aligned with the image's bottom right hand corner
+ * * The index number of the row that contains the cell whose top left
+ * hand corner should be aligned with the images bottom right hand corner.
+ *
+ * It can be used to add an image into cell A1, for example, in the following
+ * manner;
+ *
+ * HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0,
+ * (short)0, 0, (short)1, 1);
+ *
+ * The final four parameters determine that the top left hand corner should be
+ * aligned with the top left hand corner of cell A1 and it's bottom right
+ * hand corner with the top left hand corner of cell B2. Think of the image as
+ * being stretched so that it's top left hand corner is aligned with the top
+ * left hand corner of cell A1 and it's bottom right hand corner is aligned with
+ * the top left hand corner of cell B1. Interestingly, this would also produce
+ * the same results;
+ *
+ * anchor = new HSSFClientAnchor(0, 0, 1023, 255,
+ * (short)0, 0, (short)0, 0);
+ *
+ * Note that the final four parameters all contain the same value and seem to
+ * indicate that the images top left hand corner is aligned with the top left
+ * hand corner of cell A1 and that it's bottom right hand corner is also
+ * aligned with the top left hand corner of cell A1. Yet, running this code
+ * would see the image fully occupying cell A1. That is the result of the
+ * values passed to parameters three and four; these I have referred to as
+ * determing the images co-ordinates within the cell. They indicate that the
+ * image should occupy - in order - the full width of the column and the full
+ * height of the row.
+ *
+ * The co-ordinate values shown are the maxima; and they are independent of
+ * row height/column width and of the font used. Passing 255 will always result
+ * in the image occupying the full height of the row and passing 1023 will
+ * always result in the image occupying the full width of the column. They help
+ * in situations where an image is larger than a column/row and must overlap
+ * into the next column/row. Using them does mean, however, that it is often
+ * necessary to perform conversions between Excel's characters units, points,
+ * pixels and millimetres in order to establish how many rows/columns an image
+ * should occupy and just what the varous insets ought to be.
+ *
+ * Note that the first two parameters of the HSSFClientAchor classes constructor
+ * are not made use of in the code that follows. It would be fairly trivial
+ * however to extend these example further and provide methods that would centre
+ * an image within a cell or allow the user to specify that a plain border a
+ * fixed number of millimetres wide should wrap around the image. Those first
+ * two parameters would make this sort of functionality perfectly possible.
+ *
+ * Owing to the various conversions used, the actual size of the image may vary
+ * from that required; testing has so far found this to be in the region of
+ * plus or minus two millimetres. Most likely by modifying the way the
+ * calculations are performed - possibly using double(s) throughout and
+ * rounding the values at the correct point - it is likely that these errors
+ * could be reduced or removed.
+ *
+ * A note concerning Excels' image resizing behaviour. The HSSFClientAnchor
+ * class contains a method called setAnchorType(int) which can be used to
+ * determine how Excel will resize an image in reponse to the user increasing
+ * or decreasing the dimensions of the cell containing the image. There are
+ * three values that can be passed to this method; 0 = To move and size the
+ * image with the cell, 2 = To move but don't size the image with the cell,
+ * 3 = To prevent the image from moving or being resized along with the cell. If
+ * an image is inserted using this class and placed into a single cell then if
+ * the setAnchorType(int) method is called and a value of either 0 or 2 passed
+ * to it, the resultant resizing behaviour may be a surprise. The image will not
+ * grow in size of the column is made wider or the row higher but it will shrink
+ * if the columns width or rows height are reduced.
+ *
+ * @author Mark Beardsley [msb at apache.org]
+ * @version 1.00 5th August 2009.
+ */
+public class AddDimensionedImage {
+
+ // Four constants that determine how - and indeed whether - the rows
+ // and columns an image may overlie should be expanded to accomodate that
+ // image.
+ // Passing EXPAND_ROW will result in the height of a row being increased
+ // to accomodate the image if it is not already larger. The image will
+ // be layed across one or more columns.
+ // Passing EXPAND_COLUMN will result in the width of the column being
+ // increased to accomodate the image if it is not already larger. The image
+ // will be layed across one or many rows.
+ // Passing EXPAND_ROW_AND_COLUMN will result in the height of the row
+ // bing increased along with the width of the column to accomdate the
+ // image if either is not already larger.
+ // Passing OVERLAY_ROW_AND_COLUMN will result in the image being layed
+ // over one or more rows and columns. No row or column will be resized,
+ // instead, code will determine how many rows and columns the image should
+ // overlie.
+ public static final int EXPAND_ROW = 1;
+ public static final int EXPAND_COLUMN = 2;
+ public static final int EXPAND_ROW_AND_COLUMN = 3;
+ public static final int OVERLAY_ROW_AND_COLUMN = 7;
+
+ /**
+ * Add an image to a worksheet.
+ *
+ * @param cellNumber A String that contains the location of the cell whose
+ * top left hand corner should be aligned with the top
+ * left hand corner of the image; for example "A1", "A2"
+ * etc. This is to support the familiar Excel syntax.
+ * Whilst images are are not actually inserted into cells
+ * this provides a convenient method of indicating where
+ * the image should be positioned on the sheet.
+ * @param sheet A reference to the sheet that contains the cell referenced
+ * above.
+ * @param imageFile A String that encapsulates the name of and path to
+ * the image that is to be 'inserted into' the sheet.
+ * @param reqImageWidthMM A primitive double that contains the required
+ * width of the image in millimetres.
+ * @param reqImageHeightMM A primitive double that contains the required
+ * height of the image in millimetres.
+ * @param resizeBehaviour A primitive int whose value will determine how
+ * the code should react if the image is larger than
+ * the cell referenced by the cellNumber parameter.
+ * Four constants are provided to determine what
+ * should happen;
+ * AddDimensionedImage.EXPAND_ROW
+ * AddDimensionedImage.EXPAND_COLUMN
+ * AddDimensionedImage.EXPAND_ROW_AND_COLUMN
+ * AddDimensionedImage.OVERLAY_ROW_AND_COLUMN
+ * @throws java.io.FileNotFoundException If the file containing the image
+ * cannot be located.
+ * @throws java.io.IOException If a problem occurs whilst reading the file
+ * of image data.
+ * @throws java.lang.IllegalArgumentException If an invalid value is passed
+ * to the resizeBehaviour
+ * parameter.
+ */
+ public void addImageToSheet(String cellNumber, HSSFSheet sheet,
+ String imageFile, double reqImageWidthMM, double reqImageHeightMM,
+ int resizeBehaviour) throws FileNotFoundException, IOException,
+ IllegalArgumentException {
+ // Convert the String into column and row indices then chain the
+ // call to the overridden addImageToSheet() method.
+ CellReference cellRef = new CellReference(cellNumber);
+ this.addImageToSheet(cellRef.getCol(), cellRef.getRow(), sheet,
+ imageFile, reqImageWidthMM, reqImageHeightMM,resizeBehaviour);
+ }
+
+ /**
+ * Add an image to a worksheet.
+ *
+ * @param colNumber A primitive int that contains the index number of a
+ * column on the worksheet; POI column indices are zero
+ * based. Together with the rowNumber parameter's value,
+ * this parameter identifies a cell on the worksheet. The
+ * image's top left hand corner will be aligned with the
+ * top left hand corner of this cell.
+ * @param rowNumber A primtive int that contains the index number of a row
+ * on the worksheet; POI row indices are zero based.
+ * Together with the rowNumber parameter's value, this
+ * parameter identifies a cell on the worksheet. The
+ * image's top left hand corner will be aligned with the
+ * top left hand corner of this cell.
+ * @param sheet A reference to the sheet that contains the cell identified
+ * by the two parameters above.
+ * @param imageFile A String that encapsulates the name of and path to
+ * the image that is to be 'inserted into' the sheet.
+ * @param reqImageWidthMM A primitive double that contains the required
+ * width of the image in millimetres.
+ * @param reqImageHeightMM A primitive double that contains the required
+ * height of the image in millimetres.
+ * @param resizeBehaviour A primitive int whose value will determine how
+ * the code should react if the image is larger than
+ * the cell referenced by the colNumber and
+ * rowNumber parameters. Four constants are provided
+ * to determine what should happen;
+ * AddDimensionedImage.EXPAND_ROW
+ * AddDimensionedImage.EXPAND_COLUMN
+ * AddDimensionedImage.EXPAND_ROW_AND_COLUMN
+ * AddDimensionedImage.OVERLAY_ROW_AND_COLUMN
+ * @throws java.io.FileNotFoundException If the file containing the image
+ * cannot be located.
+ * @throws java.io.IOException If a problem occurs whilst reading the file
+ * of image data.
+ * @throws java.lang.IllegalArgumentException If an invalid value is passed
+ * to the resizeBehaviour
+ * parameter.
+ */
+ private void addImageToSheet(int colNumber, int rowNumber, HSSFSheet sheet,
+ String imageFile, double reqImageWidthMM, double reqImageHeightMM,
+ int resizeBehaviour) throws FileNotFoundException, IOException,
+ IllegalArgumentException {
+ HSSFRow row = null;
+ HSSFClientAnchor anchor = null;
+ HSSFPatriarch patriarch = null;
+ ClientAnchorDetail rowClientAnchorDetail = null;
+ ClientAnchorDetail colClientAnchorDetail = null;
+
+ // Validate the resizeBehaviour parameter.
+ if((resizeBehaviour != AddDimensionedImage.EXPAND_COLUMN) &&
+ (resizeBehaviour != AddDimensionedImage.EXPAND_ROW) &&
+ (resizeBehaviour != AddDimensionedImage.EXPAND_ROW_AND_COLUMN) &&
+ (resizeBehaviour != AddDimensionedImage.OVERLAY_ROW_AND_COLUMN)) {
+ throw new IllegalArgumentException("Invalid value passed to the " +
+ "resizeBehaviour parameter of AddDimensionedImage.addImageToSheet()");
+ }
+
+ // Call methods to calculate how the image and sheet should be
+ // manipulated to accomodate the image; columns and then rows.
+ colClientAnchorDetail = this.fitImageToColumns(sheet, colNumber,
+ reqImageWidthMM, resizeBehaviour);
+ rowClientAnchorDetail = this.fitImageToRows(sheet, rowNumber,
+ reqImageHeightMM, resizeBehaviour);
+
+ // Having determined if and how to resize the rows, columns and/or the
+ // image, create the HSSFClientAnchor object to position the image on
+ // the worksheet. Note how the two ClientAnchorDetail records are
+ // interrogated to recover the row/column co-ordinates and any insets.
+ // The first two parameters are not used currently but could be if the
+ // need arose to extend the functionality of this code by adding the
+ // ability to specify that a clear 'border' be placed around the image.
+ anchor = new HSSFClientAnchor(0,
+ 0,
+ colClientAnchorDetail.getInset(),
+ rowClientAnchorDetail.getInset(),
+ (short)colClientAnchorDetail.getFromIndex(),
+ rowClientAnchorDetail.getFromIndex(),
+ (short)colClientAnchorDetail.getToIndex(),
+ rowClientAnchorDetail.getToIndex());
+
+ // For now, set the anchor type to do not move or resize the
+ // image as the size of the row/column is adjusted. This could easilly
+ // become another parameter passed to the method.
+ //anchor.setAnchorType(HSSFClientAnchor.DONT_MOVE_AND_RESIZE);
+ anchor.setAnchorType(HSSFClientAnchor.MOVE_AND_RESIZE);
+
+ // Now, add the picture to the workbook. Note that the type is assumed
+ // to be a JPEG/JPG, this could easily (and should) be parameterised
+ // however.
+ //int index = sheet.getWorkbook().addPicture(this.imageToBytes(imageFile),
+ // HSSFWorkbook.PICTURE_TYPE_JPEG);
+ int index = sheet.getWorkbook().addPicture(this.imageToBytes(imageFile), HSSFWorkbook.PICTURE_TYPE_PNG);
+
+ // Get the drawing patriarch and create the picture.
+ patriarch = sheet.createDrawingPatriarch();
+ patriarch.createPicture(anchor, index);
+ }
+
+ /**
+ * Determines whether the sheets columns should be re-sized to accomodate
+ * the image, adjusts the columns width if necessary and creates then
+ * returns a ClientAnchorDetail object that facilitates construction of
+ * an HSSFClientAnchor that will fix the image on the sheet and establish
+ * it's size.
+ *
+ * @param sheet A reference to the sheet that will 'contain' the image.
+ * @param colNumber A primtive int that contains the index number of a
+ * column on the sheet.
+ * @param reqImageWidthMM A primtive double that contains the required
+ * width of the image in millimetres
+ * @param resizeBehaviour A primitve int whose value will indicate how the
+ * width of the column should be adjusted if the
+ * required width of the image is greater than the
+ * width of the column.
+ * @return An instance of the ClientAnchorDetail class that will contain
+ * the index number of the column containing the cell whose top
+ * left hand corner also defines the top left hand corner of the
+ * image, the index number column containing the cell whose top
+ * left hand corner also defines the bottom right hand corner of
+ * the image and an inset that determines how far the right hand
+ * edge of the image can protrude into the next column - expressed
+ * as a specific number of co-ordinate positions.
+ */
+ private ClientAnchorDetail fitImageToColumns(HSSFSheet sheet, int colNumber,
+ double reqImageWidthMM, int resizeBehaviour) {
+
+ double colWidthMM = 0.0D;
+ double colCoordinatesPerMM = 0.0D;
+ int pictureWidthCoordinates = 0;
+ ClientAnchorDetail colClientAnchorDetail = null;
+
+ // Get the colum's width in millimetres
+ colWidthMM = ConvertImageUnits.widthUnits2Millimetres(
+ (short)sheet.getColumnWidth(colNumber));
+
+ // Check that the column's width will accomodate the image at the
+ // required dimension. If the width of the column is LESS than the
+ // required width of the image, decide how the application should
+ // respond - resize the column or overlay the image across one or more
+ // columns.
+ if(colWidthMM < reqImageWidthMM) {
+
+ // Should the column's width simply be expanded?
+ if((resizeBehaviour == AddDimensionedImage.EXPAND_COLUMN) ||
+ (resizeBehaviour == AddDimensionedImage.EXPAND_ROW_AND_COLUMN)) {
+ // Set the width of the column by converting the required image
+ // width from millimetres into Excel's column width units.
+ sheet.setColumnWidth(colNumber,
+ ConvertImageUnits.millimetres2WidthUnits(reqImageWidthMM));
+ // To make the image occupy the full width of the column, convert
+ // the required width of the image into co-ordinates. This value
+ // will become the inset for the ClientAnchorDetail class that
+ // is then instantiated.
+ colWidthMM = reqImageWidthMM;
+ colCoordinatesPerMM = ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS /
+ colWidthMM;
+ pictureWidthCoordinates = (int)(reqImageWidthMM * colCoordinatesPerMM);
+ colClientAnchorDetail = new ClientAnchorDetail(colNumber,
+ colNumber, pictureWidthCoordinates);
+ }
+ // If the user has chosen to overlay both rows and columns or just
+ // to expand ONLY the size of the rows, then calculate how to lay
+ // the image out across one or more columns.
+ else if ((resizeBehaviour == AddDimensionedImage.OVERLAY_ROW_AND_COLUMN) ||
+ (resizeBehaviour == AddDimensionedImage.EXPAND_ROW)) {
+ colClientAnchorDetail = this.calculateColumnLocation(sheet,
+ colNumber, reqImageWidthMM);
+ }
+ }
+ // If the column is wider than the image.
+ else {
+ // Mow many co-ordinate positions are there per millimetre?
+ colCoordinatesPerMM = ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS /
+ colWidthMM;
+ // Given the width of the image, what should be it's co-ordinate?
+ pictureWidthCoordinates = (int)(reqImageWidthMM * colCoordinatesPerMM);
+ colClientAnchorDetail = new ClientAnchorDetail(colNumber,
+ colNumber, pictureWidthCoordinates);
+ }
+ return(colClientAnchorDetail);
+ }
+
+ /**
+ * Determines whether the sheet's row should be re-sized to accomodate
+ * the image, adjusts the rows height if necessary and creates then
+ * returns a ClientAnchorDetail object that facilitates construction of
+ * an HSSFClientAnchor that will fix the image on the sheet and establish
+ * it's size.
+ *
+ * @param sheet A reference to the sheet that will 'contain' the image.
+ * @param rowNumber A primtive int that contains the index number of a
+ * row on the sheet.
+ * @param reqImageHeightMM A primtive double that contains the required
+ * height of the image in millimetres
+ * @param resizeBehaviour A primitve int whose value will indicate how the
+ * height of the row should be adjusted if the
+ * required height of the image is greater than the
+ * height of the row.
+ * @return An instance of the ClientAnchorDetail class that will contain
+ * the index number of the row containing the cell whose top
+ * left hand corner also defines the top left hand corner of the
+ * image, the index number of the row containing the cell whose
+ * top left hand corner also defines the bottom right hand
+ * corner of the image and an inset that determines how far the
+ * bottom edge of the image can protrude into the next (lower)
+ * row - expressed as a specific number of co-ordinate positions.
+ */
+ private ClientAnchorDetail fitImageToRows(HSSFSheet sheet, int rowNumber,
+ double reqImageHeightMM, int resizeBehaviour) {
+ HSSFRow row = null;
+ double rowHeightMM = 0.0D;
+ double rowCoordinatesPerMM = 0.0D;
+ int pictureHeightCoordinates = 0;
+ ClientAnchorDetail rowClientAnchorDetail = null;
+
+ // Get the row and it's height
+ row = sheet.getRow(rowNumber);
+ if(row == null) {
+ // Create row if it does not exist.
+ row = sheet.createRow(rowNumber);
+ }
+
+ // Get the row's height in millimetres
+ rowHeightMM = row.getHeightInPoints() / ConvertImageUnits.POINTS_PER_MILLIMETRE;
+
+ // Check that the row's height will accomodate the image at the required
+ // dimensions. If the height of the row is LESS than the required height
+ // of the image, decide how the application should respond - resize the
+ // row or overlay the image across a series of rows.
+ if(rowHeightMM < reqImageHeightMM) {
+ if((resizeBehaviour == AddDimensionedImage.EXPAND_ROW) ||
+ (resizeBehaviour == AddDimensionedImage.EXPAND_ROW_AND_COLUMN)) {
+ row.setHeightInPoints((float)(reqImageHeightMM *
+ ConvertImageUnits.POINTS_PER_MILLIMETRE));
+ rowHeightMM = reqImageHeightMM;
+ rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS /
+ rowHeightMM;
+ pictureHeightCoordinates = (int)(reqImageHeightMM * rowCoordinatesPerMM);
+ rowClientAnchorDetail = new ClientAnchorDetail(rowNumber,
+ rowNumber, pictureHeightCoordinates);
+ }
+ // If the user has chosen to overlay both rows and columns or just
+ // to expand ONLY the size of the columns, then calculate how to lay
+ // the image out ver one or more rows.
+ else if((resizeBehaviour == AddDimensionedImage.OVERLAY_ROW_AND_COLUMN) ||
+ (resizeBehaviour == AddDimensionedImage.EXPAND_COLUMN)) {
+ rowClientAnchorDetail = this.calculateRowLocation(sheet,
+ rowNumber, reqImageHeightMM);
+ }
+ }
+ // Else, if the image is smaller than the space available
+ else {
+ rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS /
+ rowHeightMM;
+ pictureHeightCoordinates = (int)(reqImageHeightMM * rowCoordinatesPerMM);
+ rowClientAnchorDetail = new ClientAnchorDetail(rowNumber,
+ rowNumber, pictureHeightCoordinates);
+ }
+ return(rowClientAnchorDetail);
+ }
+
+ /**
+ * If the image is to overlie more than one column, calculations need to be
+ * performed to determine how many columns and whether the image will
+ * overlie just a part of one column in order to be presented at the
+ * required size.
+ *
+ * @param sheet The sheet that will 'contain' the image.
+ * @param startingColumn A primitive int whose value is the index of the
+ * column that contains the cell whose top left hand
+ * corner should be aligned with the top left hand
+ * corner of the image.
+ * @param reqImageWidthMM A primitive double whose value will indicate the
+ * required width of the image in millimetres.
+ * @return An instance of the ClientAnchorDetail class that will contain
+ * the index number of the column containing the cell whose top
+ * left hand corner also defines the top left hand corner of the
+ * image, the index number column containing the cell whose top
+ * left hand corner also defines the bottom right hand corner of
+ * the image and an inset that determines how far the right hand
+ * edge of the image can protrude into the next column - expressed
+ * as a specific number of co-ordinate positions.
+ */
+ private ClientAnchorDetail calculateColumnLocation(HSSFSheet sheet,
+ int startingColumn,
+ double reqImageWidthMM) {
+ ClientAnchorDetail anchorDetail = null;
+ double totalWidthMM = 0.0D;
+ double colWidthMM = 0.0D;
+ double overlapMM = 0.0D;
+ double coordinatePositionsPerMM = 0.0D;
+ int fromNumber = startingColumn;
+ int toColumn = startingColumn;
+ int inset = 0;
+
+ // Calculate how many columns the image will have to
+ // span in order to be presented at the required size.
+ while(totalWidthMM < reqImageWidthMM) {
+ colWidthMM = ConvertImageUnits.widthUnits2Millimetres(
+ (short)(sheet.getColumnWidth(toColumn)));
+ // Note use of the cell border width constant. Testing with an image
+ // declared to fit exactly into one column demonstrated that it's
+ // width was greater than the width of the column the POI returned.
+ // Further, this difference was a constant value that I am assuming
+ // related to the cell's borders. Either way, that difference needs
+ // to be allowed for in this calculation.
+ totalWidthMM += (colWidthMM + ConvertImageUnits.CELL_BORDER_WIDTH_MILLIMETRES);
+ toColumn++;
+ }
+ // De-crement by one the last column value.
+ toColumn--;
+ // Highly unlikely that this will be true but, if the width of a series
+ // of columns is exactly equal to the required width of the image, then
+ // simply build a ClientAnchorDetail object with an inset equal to the
+ // total number of co-ordinate positions available in a column, a
+ // from column co-ordinate (top left hand corner) equal to the value
+ // of the startingColumn parameter and a to column co-ordinate equal
+ // to the toColumn variable.
+ //
+ // Convert both values to ints to perform the test.
+ if((int)totalWidthMM == (int)reqImageWidthMM) {
+ // A problem could occur if the image is sized to fit into one or
+ // more columns. If that occurs, the value in the toColumn variable
+ // will be in error. To overcome this, there are two options, to
+ // ibcrement the toColumn variable's value by one or to pass the
+ // total number of co-ordinate positions to the third paramater
+ // of the ClientAnchorDetail constructor. For no sepcific reason,
+ // the latter option is used below.
+ anchorDetail = new ClientAnchorDetail(startingColumn,
+ toColumn, ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS);
+ }
+ // In this case, the image will overlap part of another column and it is
+ // necessary to calculate just how much - this will become the inset
+ // for the ClientAnchorDetail object.
+ else {
+ // Firstly, claculate how much of the image should overlap into
+ // the next column.
+ overlapMM = reqImageWidthMM - (totalWidthMM - colWidthMM);
+
+ // When the required size is very close indded to the column size,
+ // the calcaulation above can produce a negative value. To prevent
+ // problems occuring in later caculations, this is simply removed
+ // be setting the overlapMM value to zero.
+ if(overlapMM < 0) {
+ overlapMM = 0.0D;
+ }
+
+ // Next, from the columns width, calculate how many co-ordinate
+ // positons there are per millimetre
+ coordinatePositionsPerMM = ExcelUtil.TOTAL_COLUMN_COORDINATE_POSITIONS /
+ colWidthMM;
+ // From this figure, determine how many co-ordinat positions to
+ // inset the left hand or bottom edge of the image.
+ inset = (int)(coordinatePositionsPerMM * overlapMM);
+
+ // Now create the ClientAnchorDetail object, setting the from and to
+ // columns and the inset.
+ anchorDetail = new ClientAnchorDetail(startingColumn, toColumn, inset);
+ }
+ return(anchorDetail);
+ }
+
+ /**
+ * If the image is to overlie more than one rows, calculations need to be
+ * performed to determine how many rows and whether the image will
+ * overlie just a part of one row in order to be presented at the
+ * required size.
+ *
+ * @param sheet The sheet that will 'contain' the image.
+ * @param startingRow A primitive int whose value is the index of the row
+ * that contains the cell whose top left hand corner
+ * should be aligned with the top left hand corner of
+ * the image.
+ * @param reqImageHeightMM A primitive double whose value will indicate the
+ * required height of the image in millimetres.
+ * @return An instance of the ClientAnchorDetail class that will contain
+ * the index number of the row containing the cell whose top
+ * left hand corner also defines the top left hand corner of the
+ * image, the index number of the row containing the cell whose top
+ * left hand corner also defines the bottom right hand corner of
+ * the image and an inset that determines how far the bottom edge
+ * can protrude into the next (lower) row - expressed as a specific
+ * number of co-ordinate positions.
+ */
+ private ClientAnchorDetail calculateRowLocation(HSSFSheet sheet,
+ int startingRow, double reqImageHeightMM) {
+ ClientAnchorDetail clientAnchorDetail = null;
+ HSSFRow row = null;
+ double rowHeightMM = 0.0D;
+ double totalRowHeightMM = 0.0D;
+ double overlapMM = 0.0D;
+ double rowCoordinatesPerMM = 0.0D;
+ int toRow = startingRow;
+ int inset = 0;
+
+ // Step through the rows in the sheet and accumulate a total of their
+ // heights.
+ while(totalRowHeightMM < reqImageHeightMM) {
+ row = sheet.getRow(toRow);
+ // Note, if the row does not already exist on the sheet then create
+ // it here.
+ if(row == null) {
+ row = sheet.createRow(toRow);
+ }
+ // Get the row's height in millimetres and add to the running total.
+ rowHeightMM = row.getHeightInPoints() /
+ ConvertImageUnits.POINTS_PER_MILLIMETRE;
+ totalRowHeightMM += rowHeightMM;
+ toRow++;
+ }
+ // Owing to the way the loop above works, the rowNumber will have been
+ // incremented one row too far. Undo that here.
+ toRow--;
+ // Check to see whether the image should occupy an exact number of
+ // rows. If so, build the ClientAnchorDetail record to point
+ // to those rows and with an inset of the total number of co-ordinate
+ // position in the row.
+ //
+ // To overcome problems that can occur with comparing double values for
+ // equality, cast both to int(s) to truncate the value; VERY crude and
+ // I do not really like it!!
+ if((int)totalRowHeightMM == (int)reqImageHeightMM) {
+ clientAnchorDetail = new ClientAnchorDetail(startingRow, toRow,
+ ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS);
+ }
+ else {
+ // Calculate how far the image will project into the next row. Note
+ // that the height of the last row assessed is subtracted from the
+ // total height of all rows assessed so far.
+ overlapMM = reqImageHeightMM - (totalRowHeightMM - rowHeightMM);
+
+ // To prevent an exception being thrown when the required width of
+ // the image is very close indeed to the column size.
+ if(overlapMM < 0) {
+ overlapMM = 0.0D;
+ }
+
+ rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS /
+ rowHeightMM;
+ inset = (int)(overlapMM * rowCoordinatesPerMM);
+ clientAnchorDetail = new ClientAnchorDetail(startingRow,
+ toRow, inset);
+ }
+ return(clientAnchorDetail);
+ }
+
+ /**
+ * Loads - reads in and converts into an array of byte(s) - an image from
+ * a named file.
+ *
+ * Note: this method should be modified so that the type of the image may
+ * also be passed to it. Currently, it assumes that all images are
+ * JPG/JPEG(s).
+ *
+ * @param imageFilename A String that encapsulates the path to and name
+ * of the file that contains the image which is to be
+ * 'loaded'.
+ * @return An array of type byte that contains the raw data of the named
+ * image.
+ * @throws java.io.FileNotFoundException Thrown if it was not possible to
+ * open the specified file.
+ * @throws java.io.IOException Thrown if reading the file failed or was
+ * interrupted.
+ */
+ private byte[] imageToBytes(String imageFilename)
+ throws FileNotFoundException, IOException {
+ File imageFile = null;
+ FileInputStream fis = null;
+ ByteArrayOutputStream bos = null;
+ int read = 0;
+ try {
+ imageFile = new File(imageFilename);
+ fis = new FileInputStream(imageFile);
+ bos = new ByteArrayOutputStream();
+ while((read = fis.read()) != -1) {
+ bos.write(read);
+ }
+ return(bos.toByteArray());
+ }
+ finally {
+ if(fis != null) {
+ try {
+ fis.close();
+ fis = null;
+ }
+ catch(IOException ioEx) {
+ // Nothing to do here
+ }
+ }
+ }
+ }
+
+ /**
+ * The main entry point to the program. It contains code that demonstrates
+ * one way to use the program.
+ *
+ * Note, the code is not restricted to use on new workbooks only. If an
+ * image is to be inserted into an existing workbook. just open that
+ * workbook, gat a reference to a sheet and pass that;
+ *
+ * AddDimensionedImage addImage = new AddDimensionedImage();
+ *
+ * File file = new File("....... Existing Workbook .......");
+ * FileInputStream fis = new FileInputStream(file);
[... 228 lines stripped ...]
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