Snippet for demonstrating Cropping and Scaling of GC#drawImage #2912
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| /******************************************************************************* | ||
| * Copyright (c) 2025 IBM Corporation and others. | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| *******************************************************************************/ | ||
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| package org.eclipse.swt.snippets; | ||
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| import org.eclipse.swt.*; | ||
| import org.eclipse.swt.graphics.*; | ||
| import org.eclipse.swt.layout.*; | ||
| import org.eclipse.swt.widgets.*; | ||
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| public class Snippet389 { | ||
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Contributor
There was a problem hiding this comment. Please provide a short documentation like for other snippets. Here is one of the most recent (but the description does not need to be that long): https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet387.java Most important, the first sentence of the description should be good summary of the snippet to be automatically shown in the SnippetExplorer: |
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| private static final String IMAGE_100 = "workset_wiz150.png"; | ||
| private static final String IMAGE_200 = "workset_wiz300.png"; | ||
| private static final String IMAGES_ROOT = "resources/Snippet388/"; | ||
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| private static final String IMAGE_PATH_100 = IMAGES_ROOT + IMAGE_100; | ||
| private static final String IMAGE_PATH_200 = IMAGES_ROOT + IMAGE_200; | ||
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| static int srcX, srcY, srcW, srcH; | ||
| static int dstX, dstY, dstW, dstH; | ||
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| public static void main(String[] args) { | ||
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| ImageFileNameProvider filenameProvider = zoom -> { | ||
| switch (zoom) { | ||
| case 100: | ||
| return IMAGE_PATH_100; | ||
| case 200: | ||
| return IMAGE_PATH_200; | ||
| default: | ||
| return null; | ||
| } | ||
| }; | ||
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| Display display = new Display(); | ||
| Shell shell = new Shell(display); | ||
| shell.setText("GC#drawImage Interactive"); | ||
| shell.setLayout(new GridLayout(2, false)); | ||
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| Image image = new Image(display, filenameProvider); | ||
| Rectangle imgBounds = image.getBounds(); | ||
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| final int fixedDstW = imgBounds.width * 2; | ||
| final int fixedDstH = imgBounds.height * 2; | ||
| srcX = imgBounds.width / 2; | ||
| srcY = imgBounds.height / 2; | ||
| srcW = imgBounds.width / 2; | ||
| srcH = imgBounds.height / 2; | ||
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| dstX = 0; | ||
| dstY = 0; | ||
| dstW = imgBounds.width; | ||
| dstH = imgBounds.height; | ||
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| Group controls = new Group(shell, SWT.NONE); | ||
| controls.setText("GC#drawImage Arguments"); | ||
| controls.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, true)); | ||
| controls.setLayout(new GridLayout(2, false)); | ||
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| Text tSrcX = field(controls, "srcX", srcX); | ||
| Text tSrcY = field(controls, "srcY", srcY); | ||
| Text tSrcW = field(controls, "srcWidth", srcW); | ||
| Text tSrcH = field(controls, "srcHeight", srcH); | ||
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| Text tDstX = field(controls, "destX", dstX); | ||
| Text tDstY = field(controls, "destY", dstY); | ||
| Text tDstW = field(controls, "destWidth", dstW); | ||
| Text tDstH = field(controls, "destHeight", dstH); | ||
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| Button apply = new Button(controls, SWT.PUSH); | ||
| apply.setText("Apply"); | ||
| apply.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1)); | ||
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| Composite draw = new Composite(shell, SWT.NONE); | ||
| draw.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); | ||
| draw.setLayout(new GridLayout(2, true)); | ||
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| Canvas srcCanvas = new Canvas(draw, SWT.BORDER); | ||
| srcCanvas.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); | ||
| srcCanvas.addListener(SWT.Paint, e -> { | ||
| GC gc = e.gc; | ||
| Rectangle ca = srcCanvas.getClientArea(); | ||
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| int ix = (ca.width - imgBounds.width) / 2; | ||
| int iy = (ca.height - imgBounds.height) / 2; | ||
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| gc.drawImage(image, ix, iy); | ||
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| gc.setLineStyle(SWT.LINE_DASH); | ||
| gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK)); | ||
| gc.drawRectangle(ix, iy, imgBounds.width, imgBounds.height); | ||
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| gc.setForeground(display.getSystemColor(SWT.COLOR_RED)); | ||
| gc.setLineWidth(2); | ||
| gc.drawRectangle(ix + srcX, iy + srcY, srcW, srcH); | ||
| }); | ||
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| Canvas dstCanvas = new Canvas(draw, SWT.BORDER); | ||
| dstCanvas.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); | ||
| dstCanvas.addListener(SWT.Paint, e -> { | ||
| GC gc = e.gc; | ||
| Rectangle ca = dstCanvas.getClientArea(); | ||
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| int px = (ca.width - fixedDstW) / 2; | ||
| int py = (ca.height - fixedDstH) / 2; | ||
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| gc.drawImage( | ||
| image, | ||
| srcX, srcY, srcW, srcH, | ||
| px + dstX, py + dstY, | ||
| dstW, dstH | ||
| ); | ||
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| gc.setLineStyle(SWT.LINE_DASH); | ||
| gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK)); | ||
| gc.drawRectangle(px, py, fixedDstW, fixedDstH); | ||
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| gc.setForeground(display.getSystemColor(SWT.COLOR_RED)); | ||
| gc.setLineWidth(2); | ||
| gc.drawRectangle(px + dstX, py + dstY, dstW, dstH); | ||
| }); | ||
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| Label srcLabel = new Label(draw, SWT.CENTER); | ||
| srcLabel.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false)); | ||
| srcLabel.setText("150 x 150"); | ||
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| Label dstLabel = new Label(draw, SWT.CENTER); | ||
| dstLabel.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false)); | ||
| dstLabel.setText("300 x 300"); | ||
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| apply.addListener(SWT.Selection, e -> { | ||
| srcX = parse(tSrcX); | ||
| srcY = parse(tSrcY); | ||
| srcW = parse(tSrcW); | ||
| srcH = parse(tSrcH); | ||
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| dstX = parse(tDstX); | ||
| dstY = parse(tDstY); | ||
| dstW = parse(tDstW); | ||
| dstH = parse(tDstH); | ||
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| srcCanvas.redraw(); | ||
| dstCanvas.redraw(); | ||
| }); | ||
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| shell.setSize(1000, 600); | ||
| shell.open(); | ||
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| while (!shell.isDisposed()) { | ||
| if (!display.readAndDispatch()) | ||
| display.sleep(); | ||
| } | ||
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| image.dispose(); | ||
| display.dispose(); | ||
| } | ||
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| static Text field(Composite parent, String label, int value) { | ||
| new Label(parent, SWT.NONE).setText(label); | ||
| Text t = new Text(parent, SWT.BORDER); | ||
| t.setText(String.valueOf(value)); | ||
| t.setLayoutData(new GridData(70, SWT.DEFAULT)); | ||
| return t; | ||
| } | ||
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| static int parse(Text t) { | ||
| try { | ||
| return Integer.parseInt(t.getText()); | ||
| } catch (NumberFormatException e) { | ||
| return 0; | ||
| } | ||
| } | ||
| } | ||
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