[sis] branch visual-test updated: Add a simple image viewer.

[de...@apache.org]

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desruisseaux pushed a commit to branch visual-test
in repository https://gitbox.apache.org/repos/asf/sis.git


The following commit(s) were added to refs/heads/visual-test by this push:
     new 85bc03e  Add a simple image viewer.
85bc03e is described below

commit 85bc03ea1f038aade6138ad7fd7109bc1305e3d2
Author: Martin Desruisseaux <ma...@geomatys.com>
AuthorDate: Tue May 18 00:33:30 2021 +0200

    Add a simple image viewer.
---
 src/main/java/org/apache/sis/swing/ImagePane.java | 108 ++++++++++++++++++++++
 1 file changed, 108 insertions(+)

diff --git a/src/main/java/org/apache/sis/swing/ImagePane.java b/src/main/java/org/apache/sis/swing/ImagePane.java
new file mode 100644
index 0000000..4d7c0f9
--- /dev/null
+++ b/src/main/java/org/apache/sis/swing/ImagePane.java
@@ -0,0 +1,108 @@
+/*
+ * 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.sis.swing;
+
+import java.awt.Graphics2D;
+import java.awt.image.RenderedImage;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Rectangle2D;
+import javax.swing.JFrame;
+import org.opengis.referencing.datum.PixelInCell;
+import org.apache.sis.image.PlanarImage;
+import org.apache.sis.coverage.grid.GridCoverage;
+import org.apache.sis.coverage.grid.GridGeometry;
+import org.apache.sis.referencing.operation.matrix.AffineTransforms2D;
+
+
+/**
+ * Shows a {@link RenderedImage}.
+ *
+ * @author  Martin Desruisseaux (Geomatys)
+ * @version 1.1
+ * @since   1.1
+ * @module
+ */
+@SuppressWarnings("serial")
+public class ImagePane extends ZoomPane {
+    /**
+     * The data to show.
+     */
+    private final RenderedImage image;
+
+    /**
+     * The transform from pixel coordinates to "real world" coordinates.
+     */
+    private final AffineTransform gridToCRS;
+
+    /**
+     * Show the given coverage in a panel. This method assumes that the coverage is two-dimensional
+     * and uses an affine "grid to CRS" transform. This is not well verified because this method is
+     * only for quick testing purpose.
+     *
+     * @param  coverage  the coverage to show.
+     */
+    public static void show(final GridCoverage coverage) {
+        final RenderedImage image = coverage.render(null);
+        final GridGeometry gg = (GridGeometry) image.getProperty(PlanarImage.GRID_GEOMETRY_KEY);
+        show(image, (AffineTransform) gg.getGridToCRS(PixelInCell.CELL_CORNER));
+    }
+
+    /**
+     * Show the given image in a panel.
+     *
+     * @param  image      the image to show.
+     * @param  gridToCRS  the transform from pixel coordinates to "real world" coordinates.
+     */
+    public static void show(final RenderedImage image, final AffineTransform gridToCRS) {
+        final JFrame frame = new JFrame("RenderedImage");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.add(new ImagePane(image, gridToCRS).createScrollPane());
+        frame.pack();
+        frame.setVisible(true);
+    }
+
+    /**
+     * Creates a new viewer for the given image.
+     *
+     * @param  image      the image to show.
+     * @param  gridToCRS  the transform from pixel coordinates to "real world" coordinates.
+     */
+    public ImagePane(final RenderedImage image, final AffineTransform gridToCRS) {
+        this.image = image;
+        this.gridToCRS = gridToCRS;
+    }
+
+    /**
+     * Requests a window of the size of the image to show.
+     */
+    @Override
+    public Rectangle2D getArea() {
+        final Rectangle2D.Double bounds = new Rectangle2D.Double();
+        bounds.width  = image.getWidth();
+        bounds.height = image.getHeight();
+        return AffineTransforms2D.transform(gridToCRS, bounds, bounds);
+    }
+
+    /**
+     * Paints the image.
+     */
+    @Override
+    protected void paintComponent(final Graphics2D graphics) {
+        graphics.transform(zoom);
+        graphics.drawRenderedImage(image, gridToCRS);
+    }
+}