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Migrate 5 effects to Graphics Example: Explosion, Mandelbrot, ShadeBobs, Twister, Wave
Migrate the following effects from SWT-OldSchoolEffect to GraphicsExample: - ExplosionTab: Particle system with fire propagation - MandelbrotTab: Animated Mandelbrot fractal with zoom - ShadeBobsTab: Heat trail shade bobs effect - TwisterTab: Torsion deformation on checkered pattern - WaveTab: Multiple wave motion patterns Each effect extends AnimatedGraphicsTab, is registered in GraphicsExample.createTabs(), and has localized strings in examples_graphics.properties. Fixes #3189 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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‎examples/org.eclipse.swt.examples/src/examples_graphics.properties‎

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@@ -196,3 +196,18 @@ BlobDescription=This is a miscellaneous demonstration of an animated metaball ef
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Plasma=Plasma
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PlasmaDescription=This is a miscellaneous demonstration of an animated plasma effect using precomputed sine tables and a cycling color palette.
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Explosion=Explosion
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ExplosionDescription=This is a miscellaneous demonstration of an animated explosion effect using a particle system and fire propagation algorithm.
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Mandelbrot=Mandelbrot
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MandelbrotDescription=This is a miscellaneous demonstration of an animated Mandelbrot fractal with a continuously zooming view into the fractal boundary.
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ShadeBobs=Shade Bobs
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ShadeBobsDescription=This is a miscellaneous demonstration of an animated shade bobs effect where a heated bob shape moves along a precomputed path, leaving a fading heat trail.
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Twister=Twister
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TwisterDescription=This is a miscellaneous demonstration of an animated twister effect using precomputed sine tables and a torsion deformation on a checkered pattern.
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Wave=Wave
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WaveDescription=This is a miscellaneous demonstration of an animated wave effect with multiple motion patterns cycling through four different wave algorithms.

‎examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/graphics/ExplosionTab.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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* W.P. van Paassen - 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.SWT;
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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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import org.eclipse.swt.graphics.PaletteData;
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import org.eclipse.swt.graphics.RGB;
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/**
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* This tab displays an animated explosion effect using a particle system
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* and fire propagation algorithm.
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*/
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public class ExplosionTab extends AnimatedGraphicsTab {
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private static final int NUMBER_OF_PARTICLES = 500;
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private ImageData imageData;
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private Image outputImage;
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private int[] fire;
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private Particle[] particles;
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private RGB[] colors;
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private int lastWidth;
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private int lastHeight;
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private static class Particle {
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int xpos, ypos, xdir, ydir;
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int colorindex;
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boolean dead;
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}
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public ExplosionTab(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("Explosion"); //$NON-NLS-1$
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}
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@Override
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public String getDescription() {
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return GraphicsExample.getResourceString("ExplosionDescription"); //$NON-NLS-1$
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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 (fire == null) {
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return;
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}
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if (width != lastWidth || height != lastHeight) {
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init(width, height);
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}
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// Move and draw particles into fire array
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int nbDead = 0;
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for (int i = 0; i < NUMBER_OF_PARTICLES; i++) {
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if (!particles[i].dead) {
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particles[i].xpos += particles[i].xdir;
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particles[i].ypos += particles[i].ydir;
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if (particles[i].ypos >= height - 3 || particles[i].colorindex == 0
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|| particles[i].xpos <= 1 || particles[i].xpos >= width - 3) {
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particles[i].dead = true;
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continue;
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}
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particles[i].ydir++;
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particles[i].colorindex--;
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final int temp = particles[i].ypos * width + particles[i].xpos;
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fire[temp] = particles[i].colorindex;
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fire[temp - 1] = particles[i].colorindex;
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fire[temp + width] = particles[i].colorindex;
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fire[temp - width] = particles[i].colorindex;
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fire[temp + 1] = particles[i].colorindex;
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} else {
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nbDead++;
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}
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}
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// Create fire effect
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for (int i = 1; i < height - 2; i++) {
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final int index = (i - 1) * width;
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for (int j = 1; j < width - 2; j++) {
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int buf = index + j;
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int temp = fire[buf];
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temp += fire[buf + 1];
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temp += fire[buf - 1];
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buf += width;
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temp += fire[buf - 1];
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temp += fire[buf + 1];
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buf += width;
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temp += fire[buf];
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temp += fire[buf + 1];
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temp += fire[buf - 1];
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temp >>= 3;
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if (temp > 4) {
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temp -= 4;
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} else {
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temp = 0;
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}
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fire[buf - width] = temp;
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}
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}
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// Draw fire array to image from bottom to top
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int pixel = width * height - 1;
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for (int i = height - 1; i >= 0; --i) {
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final int temp = i * width;
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for (int j = width - 1; j >= 0; --j) {
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imageData.setPixel(pixel % width, pixel / width, fire[temp + j]);
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pixel--;
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}
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}
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if (nbDead == NUMBER_OF_PARTICLES) {
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initParticles(width, height);
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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 (fire == null) {
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init(width, height);
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}
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gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_BLACK));
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gc.fillRectangle(0, 0, width, height);
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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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gc.drawImage(outputImage, 0, 0);
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}
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private void init(int width, int height) {
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lastWidth = width;
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lastHeight = height;
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fire = new int[width * height];
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particles = new Particle[NUMBER_OF_PARTICLES];
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colors = new RGB[256];
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for (int i = 0; i < 32; ++i) {
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colors[i] = new RGB(0, 0, i << 1);
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colors[i + 32] = new RGB(i << 3, 0, 64 - (i << 1));
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colors[i + 64] = new RGB(255, i << 3, 0);
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colors[i + 96] = new RGB(255, 255, i << 2);
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colors[i + 128] = new RGB(255, 255, 64 + (i << 2));
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colors[i + 160] = new RGB(255, 255, 128 + (i << 2));
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colors[i + 192] = new RGB(255, 255, 192 + i);
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colors[i + 224] = new RGB(255, 255, 224 + i);
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}
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imageData = new ImageData(width, height, 8, new PaletteData(colors));
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for (int i = 0; i < NUMBER_OF_PARTICLES; i++) {
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particles[i] = new Particle();
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}
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initParticles(width, height);
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}
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private void initParticles(int width, int height) {
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for (int i = 0; i < NUMBER_OF_PARTICLES; i++) {
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particles[i].xpos = (width >> 1) - 20 + (int) (40.0 * Math.random());
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particles[i].ypos = (height >> 1) - 20 + (int) (40.0 * Math.random());
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particles[i].xdir = -10 + (int) (20.0 * Math.random());
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particles[i].ydir = -17 + (int) (19.0 * Math.random());
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particles[i].colorindex = 255;
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particles[i].dead = false;
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}
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}
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}

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

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@@ -481,6 +481,11 @@ GraphicsTab[] createTabs() {
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new TransformReuseTab(this),
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new PathReuseTab(this),
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new PlasmaTab(this),
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new ExplosionTab(this),
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new MandelbrotTab(this),
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new ShadeBobsTab(this),
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new TwisterTab(this),
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new WaveTab(this),
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};
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}
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‎examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/graphics/MandelbrotTab.java‎

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/*******************************************************************************
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* Copyright (c) 2019 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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* Calogiuri Enzo Antonio (Insolit Dust) - 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.SWT;
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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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import org.eclipse.swt.graphics.PaletteData;
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/**
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* This tab displays an animated Mandelbrot fractal with a continuously
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* zooming view into the fractal boundary.
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*/
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public class MandelbrotTab extends AnimatedGraphicsTab {
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private static final int MAX_ITER = 570;
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private ImageData imageData;
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private Image outputImage;
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private double zoom = 150;
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private double moveX = -0.5;
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private double moveY = 0.0;
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private double zoomSpeed = 1.02;
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private int lastWidth;
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private int lastHeight;
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public MandelbrotTab(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("Mandelbrot"); //$NON-NLS-1$
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}
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@Override
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public String getDescription() {
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return GraphicsExample.getResourceString("MandelbrotDescription"); //$NON-NLS-1$
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}
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@Override
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public int getInitialAnimationTime() {
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return 50;
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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 (imageData == null) {
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return;
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}
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if (width != lastWidth || height != lastHeight) {
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init(width, height);
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}
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zoom *= zoomSpeed;
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drawMandelbrot(width, height);
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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 (imageData == null) {
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init(width, height);
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}
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gc.setBackground(gc.getDevice().getSystemColor(SWT.COLOR_BLACK));
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gc.fillRectangle(0, 0, width, height);
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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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gc.drawImage(outputImage, 0, 0);
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}
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private void init(int width, int height) {
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lastWidth = width;
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lastHeight = height;
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zoom = 150;
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imageData = new ImageData(width, height, 24, new PaletteData(0xFF0000, 0xFF00, 0xFF));
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}
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private void drawMandelbrot(int width, int height) {
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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double zx = 0;
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double zy = 0;
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final double cX = (x - width / 2.0) / zoom + moveX;
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final double cY = (y - height / 2.0) / zoom + moveY;
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double tmp;
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int iter = MAX_ITER;
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while (zx * zx + zy * zy < 4 && iter > 0) {
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tmp = zx * zx - zy * zy + cX;
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zy = 2.0 * zx * zy + cY;
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zx = tmp;
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iter--;
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}
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imageData.setPixel(x, y, iter | iter << 8);
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}
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}
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}
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}

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