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Posted to dev@pdfbox.apache.org by "John Hewson (JIRA)" <ji...@apache.org> on 2014/10/11 02:55:33 UTC
[jira] [Closed] (PDFBOX-1444) Capability to use custom PageDrawer
in PDPage.convertToImage
[ https://issues.apache.org/jira/browse/PDFBOX-1444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
John Hewson closed PDFBOX-1444.
-------------------------------
Resolution: Fixed
Fix Version/s: 2.0.0
We fixed this in 2.0 in a different way. There's a new PDFGraphicsStreamEngine class which can be subclasses in order to gain access to graphics. PageDrawer itself in now completely internal to PDFBox.
> Capability to use custom PageDrawer in PDPage.convertToImage
> ------------------------------------------------------------
>
> Key: PDFBOX-1444
> URL: https://issues.apache.org/jira/browse/PDFBOX-1444
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel, Rendering
> Affects Versions: 1.8.0
> Environment: Ubuntu 11.10 64 bit on Intel® Core™ i5-2430M CPU. Sun JDK "1.6.0_30" (build 1.6.0_30-b12) Java HotSpot(TM) 64-Bit Server VM (build 20.5-b03, mixed mode).
> Reporter: Ravi Hegde
> Fix For: 2.0.0
>
>
> Extending PageDrawer is a handy technique for PDF processing tools to get information about the elements drawn on the page while drawing the page in one go. However, PDPage.convertToImage has no way of plugging in the extended PageDrawer class. It is necessary to provide some way to use custom PageDrawer instance in PDPage.convertToImage. Overloaded PDPage.convertToImage with a PageDrawer instance may be a good option. Here is the patch:
> svn diff PDPage.java
> Index: PDPage.java
> ===================================================================
> --- PDPage.java (revision 1407714)
> +++ PDPage.java (working copy)
> @@ -699,6 +699,24 @@
> */
> public BufferedImage convertToImage(int imageType, int resolution) throws IOException
> {
> + PageDrawer drawer = new PageDrawer();
> + return convertToImage(imageType, resolution, drawer);
> + }
> +
> + /**
> + * Convert this page to an output image using custom PageDrawer instance.
> + * Custom page drawer is useful for collecting information about the
> + * elements drawn on the page while drawing the page.
> + *
> + * @param imageType the image type (see {@link BufferedImage}.TYPE_*)
> + * @param resolution the resolution in dpi (dots per inch)
> + * @param drawer Custom {@link PageDrawer} instance.
> + * @return A graphical representation of this page.
> + *
> + * @throws IOException If there is an error drawing to the image.
> + */
> + public BufferedImage convertToImage(int imageType, int resolution, PageDrawer drawer) throws IOException
> + {
> PDRectangle cropBox = findCropBox();
> float widthPt = cropBox.getWidth();
> float heightPt = cropBox.getHeight();
> @@ -753,7 +771,6 @@
> graphics.rotate((float)Math.toRadians(rotationAngle));
> }
> graphics.scale( scaling, scaling );
> - PageDrawer drawer = new PageDrawer();
> drawer.drawPage( graphics, this, pageDimension );
>
> return retval;
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