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Migrate 6 OldSchoolEffect examples to GraphicsExample
Migrates 6 image-based effects from SWT-OldSchoolEffect: - Block Effect (rayfilter/BlockEffect.java + flower.jpg) - Twirl Effect (rayfilter/TwirlEffect.java + flower.jpg) - Sine Wave (sinewave/SineWave.java + tuxblackbg.png) - Sky (sky2/Sky2.java + DEMO2.png) - Unlimited Balls (unlimitedballs/UnlimitedBalls.java + ball.gif) - Warp (warp/Warp.java + texture.png) Contributes to #3189 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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‎examples/org.eclipse.swt.examples/src/examples_graphics.properties‎

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@@ -238,3 +238,21 @@ FlatTextDescription=This is a miscellaneous demonstration of an animated flat te
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Lens=Lens
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LensDescription=This is a miscellaneous demonstration of an animated spherical lens distortion effect that bounces across an image, magnifying the area beneath the lens.
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BlockEffect=Block Effect
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BlockEffectDescription=This is a miscellaneous demonstration of an animated block pixelation effect that oscillates block size from single pixels to large blocks and back on an image.
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TwirlEffect=Twirl Effect
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TwirlEffectDescription=This is a miscellaneous demonstration of an animated twirl distortion effect that rotates pixels around the center of an image with increasing and decreasing twirl angle.
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SineWave=Sine Wave
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SineWaveDescription=This is a miscellaneous demonstration of an animated sine wave distortion effect that cycles through 12 different wave configurations applied to an image.
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Sky=Sky
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SkyDescription=This is a miscellaneous demonstration of an animated sky/landscape effect using perspective-corrected texture mapping with scrolling sprites and shadows.
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UnlimitedBalls=Unlimited Balls
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UnlimitedBallsDescription=This is a miscellaneous demonstration of an animated unlimited balls effect where ball sprites are drawn along Lissajous-like curves using multiple offscreen buffers.
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Warp=Warp
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WarpDescription=This is a miscellaneous demonstration of an animated warp distortion effect that uses a precomputed distortion lookup table to render a texture with animated warping.

‎examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/graphics/BlockEffectTab.java‎

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/*******************************************************************************
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* Copyright (c) 2018 Laurent Caron and others.
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*
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* This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License 2.0
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* which accompanies this distribution, and is available at
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* https://www.eclipse.org/legal/epl-2.0/
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*
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* SPDX-License-Identifier: EPL-2.0
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*
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* Contributors:
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* Jerry Huxtable - Original Version
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* Laurent Caron (laurent.caron at gmail dot com) - Conversion to SWT
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* IBM Corporation - adaptation to GraphicsExample
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*******************************************************************************/
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package org.eclipse.swt.examples.graphics;
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import org.eclipse.swt.graphics.GC;
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import org.eclipse.swt.graphics.Image;
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import org.eclipse.swt.graphics.ImageData;
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/**
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* This tab displays an animated block pixelation effect that oscillates block
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* size from single pixels to large blocks and back on an image.
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*/
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public class BlockEffectTab extends AnimatedGraphicsTab {
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private ImageData sourceImage;
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private ImageData imageData;
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private Image outputImage;
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private int imgWidth, imgHeight;
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private int blockSize;
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private int direction;
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public BlockEffectTab(GraphicsExample example) {
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super(example);
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}
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@Override
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public String getCategory() {
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return GraphicsExample.getResourceString("Misc"); //$NON-NLS-1$
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}
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@Override
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public String getText() {
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return GraphicsExample.getResourceString("BlockEffect"); //$NON-NLS-1$
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}
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@Override
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public String getDescription() {
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return GraphicsExample.getResourceString("BlockEffectDescription"); //$NON-NLS-1$
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}
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@Override
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public int getInitialAnimationTime() {
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return 10;
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}
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@Override
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public void dispose() {
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if (outputImage != null) {
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outputImage.dispose();
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outputImage = null;
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}
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}
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@Override
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public void next(int width, int height) {
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if (sourceImage == null) {
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return;
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}
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imageData = filter(sourceImage, blockSize);
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blockSize += direction;
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if (blockSize <= 1) {
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direction = 1;
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blockSize = 1;
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}
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if (blockSize >= imgWidth / 4) {
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direction = -1;
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}
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}
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@Override
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public void paint(GC gc, int width, int height) {
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if (!example.checkAdvancedGraphics()) return;
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if (sourceImage == null) {
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Image loaded = example.loadImage(gc.getDevice(), "flower.jpg"); //$NON-NLS-1$
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if (loaded == null) return;
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sourceImage = loaded.getImageData();
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imgWidth = sourceImage.width;
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imgHeight = sourceImage.height;
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int[] pixels = new int[imgWidth * imgHeight];
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sourceImage.getPixels(0, 0, imgWidth * imgHeight, pixels, 0);
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imageData = new ImageData(imgWidth, imgHeight, sourceImage.depth, sourceImage.palette);
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imageData.setPixels(0, 0, imgWidth * imgHeight, pixels, 0);
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blockSize = 1;
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direction = 1;
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}
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if (imageData == null) {
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return;
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}
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if (outputImage != null) {
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outputImage.dispose();
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}
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outputImage = new Image(gc.getDevice(), imageData);
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int x = (width - imgWidth) / 2;
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int y = (height - imgHeight) / 2;
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gc.drawImage(outputImage, x, y);
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}
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private ImageData filter(ImageData src, int size) {
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if (size <= 1) {
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int[] pixels = new int[imgWidth * imgHeight];
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src.getPixels(0, 0, imgWidth * imgHeight, pixels, 0);
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ImageData copy = new ImageData(imgWidth, imgHeight, src.depth, src.palette);
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copy.setPixels(0, 0, imgWidth * imgHeight, pixels, 0);
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return copy;
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}
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ImageData dst = new ImageData(imgWidth, imgHeight, src.depth, src.palette);
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int[] pixels = new int[size * size];
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for (int y = 0; y < imgHeight; y += size) {
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for (int x = 0; x < imgWidth; x += size) {
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int w = Math.min(size, imgWidth - x);
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int h = Math.min(size, imgHeight - y);
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int t = w * h;
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getRGB(src, x, y, w, h, pixels, 0, w);
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int r = 0, g = 0, b = 0;
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int i = 0;
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for (int by = 0; by < h; by++) {
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for (int bx = 0; bx < w; bx++) {
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int argb = pixels[i];
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r += (argb >> 16) & 0xff;
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g += (argb >> 8) & 0xff;
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b += argb & 0xff;
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i++;
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}
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}
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int argb = ((r / t) << 16) | ((g / t) << 8) | (b / t);
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i = 0;
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for (int by = 0; by < h; by++) {
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for (int bx = 0; bx < w; bx++) {
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pixels[i] = (pixels[i] & 0xff000000) | argb;
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i++;
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}
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}
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setRGB(dst, x, y, w, h, pixels, 0, w);
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}
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}
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return dst;
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}
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private static void getRGB(ImageData image, int startX, int startY, int w, int h, int[] pixels, int offset, int scansize) {
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int yoff = offset;
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for (int y = startY; y < startY + h; y++, yoff += scansize) {
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int off = yoff;
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for (int x = startX; x < startX + w; x++) {
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pixels[off++] = image.getPixel(x, y);
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}
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}
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}
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private static void setRGB(ImageData image, int startX, int startY, int w, int h, int[] pixels, int offset, int scansize) {
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int yoff = offset;
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for (int y = startY; y < startY + h; y++, yoff += scansize) {
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int off = yoff;
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for (int x = startX; x < startX + w; x++) {
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image.setPixel(x, y, pixels[off++]);
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}
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}
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}
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}

‎examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/graphics/DEMO2.png‎

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‎examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/graphics/GraphicsExample.java‎

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@@ -495,6 +495,12 @@ GraphicsTab[] createTabs() {
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new BumpMappingTab(this),
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new FlatTextTab(this),
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new LensTab(this),
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new BlockEffectTab(this),
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new TwirlEffectTab(this),
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new SineWaveTab(this),
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new SkyTab(this),
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new UnlimitedBallsTab(this),
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new WarpTab(this),
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};
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}
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