Migrate all SWT-OldSchoolEffect examples to GraphicsExample

[vogella]

Problem Statement

Migrate all remaining effects from SWT-OldSchoolEffect to the SWT GraphicsExample framework. Starfield and Ripple are already migrated (PR #3157, #3165). Each effect must become a *Tab.java class extending AnimatedGraphicsTab, registered in GraphicsExample.java, with localized strings in examples_graphics.properties.

Migration Pattern (from PR #3157 and #3165)

Each effect migration follows these steps:

1. Create <Effect>Tab.java extending AnimatedGraphicsTab in examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/graphics/
2. Override: getCategory() → "Misc", getText(), getDescription(), getInitialAnimationTime(), next(), paint()
3. If the effect uses images: copy image to the graphics package dir and use example.loadImage(device, "name.ext")
4. If the effect allocates Images/GC/etc: dispose them properly in dispose()
5. Add localized strings to src/examples_graphics.properties
6. Register the tab in GraphicsExample.java createTabs() method
7. Ensure the build compiles without errors

Build Verification

Before submitting a PR, the following command must succeed without errors or warnings:

mvn clean verify -Dnative=gtk.linux.x86_64 -DskipTests

PR Review Checklist (from feedback on #3157 and #3165)

Each migrated effect MUST satisfy:

• No Color disposal — Colors do not need to be disposed in modern SWT. Use new Color(r, g, b) freely without .dispose().
• Use simple Color constructor — Use new Color(r, g, b) not new Color(display, r, g, b). Examples have been cleaned to use the simpler constructor.
• Dispose Images — Image objects MUST be disposed (in dispose() override or before recreation).
• Dispose GC — GC objects MUST be disposed after use.
• No compiler errors or warnings — Build must succeed without warnings/errors.
• Use $NON-NLS-1$ markers — All string literals used for resource keys need NLS markers.
• Proper copyright header — EPL-2.0 header with original author credit.
• Category = "Misc" — All old-school effects go in the Misc category.
• Localized strings — All user-visible text via examples_graphics.properties.
• Inner classes for helpers — If the effect needs helper types (e.g., Star, Particle), use static inner classes rather than separate files where possible.

Migration Progress

Phase 1: Pure Algorithmic Effects (no images needed)

• Starfield — starfield/ → StarfieldTab (PR Migrate Starfield example to Graphics Example #3157)
• Blob — blob/Blob.java → BlobTab
• Burning Sea — burningsea/BurningSea.java → BurningSeaTab
• Copper Bars — copper/Coppers.java → CopperBarsTab
• Explosion — explosion/Explosion.java + Particle.java → ExplosionTab
• Fire — fire/Fire.java → FireTab
• Mandelbrot — mandelbrot/Mandelbrot.java → MandelbrotTab
• Moiré — moire/Moire.java → MoireTab
• Plasma — plasma/Plasma.java → PlasmaTab
• Raster Bars — rasterbars/RasterBars.java → RasterBarsTab
• Shade Bobs — shadebobs/ShadeBobs.java → ShadeBobsTab
• Twister — twister/Twister.java → TwisterTab
• Wave — wave/WaveEffect.java → WaveTab
• Dancing (no light) — Dancing/nolight/*.java → DancingTab

Phase 2: Image-Based Effects (single image)

• Ripple — ripple/ → RippleTab (PR Migrate Ripple effect to Graphics Example #3165)
• Bump Mapping — bump/Bump.java + bump.png → BumpMappingTab
• Flat Text — flattext/FlatText.java + TEXFLAT2.png → FlatTextTab
• Lens — Lens/Lens.java + tuxblackbg.png → LensTab
• Block Effect — rayfilter/BlockEffect.java + flower.jpg → BlockEffectTab
• Twirl Effect — rayfilter/TwirlEffect.java + flower.jpg → TwirlEffectTab
• Sine Wave — sinewave/SineWave.java + SinEffect.java + tuxblackbg.png → SineWaveTab
• Sky — sky2/Sky2.java + DEMO2.png → SkyTab
• Unlimited Balls — unlimitedballs/UnlimitedBalls.java + ball.gif → UnlimitedBallsTab
• Warp — warp/Warp.java + texture.png → WarpTab
• Wobble — wobble/WobbleEffect.java + bu.jpg → WobbleTab
• Wormhole — wormhole/Wormhole.java + texture.png → WormholeTab
• Dancing (with light) — Dancing/light/*.java → DancingLightTab

Phase 3: Complex Effects (multiple images or helper classes)

• RotoZoom — rotozoom/RotoZoom.java + tux256256.png + tile.png → RotoZoomTab
• Tunnel — tunnel/Tunnel1.java + tunnel textures → TunnelTab
• Voxel — voxel/Voxel.java + 3 images → VoxelTab
• Sine Scroll — SineScroll/SineScroll.java + Star.java + font_classic_16x16.gif → SineScrollTab
• Simple Scroll — scrolls/SimpleScroll.java + helpers → SimpleScrollTab
• Advanced Scroll — scrolls/AdvancedScroll.java + helpers → AdvancedScrollTab
• Star Wars Scroll — scrolls/StarwarsScroll.java + helpers → StarWarsScrollTab

Excluded

• SpecialImage/SpecialImageLoader.java — Utility class, not an effect
• Helper classes (Star.java, ImageMath.java, TransformFilter.java, PerspectiveFilter.java, SinEffect.java, Particle.java) — Will become inner classes

Notes

• Each effect should be its own commit/PR for easy review
• The Scrolls group (Simple, Advanced, StarWars) share helper classes (TransformFilter, PerspectiveFilter, ImageMath) — these should be shared inner classes or a single utility, migrated together
• Dancing has two variants (light/no-light) that share PlanIso/PointIso — consider merging or migrating together
• Total: 31 effects to migrate
• Background: these examples are useful for testing the SKIA Canvas work and highlight different aspects of the Canvas
• Original author @lcaron has given permission (see Migrate to SWT GraphicsExamples standard lcaron/SWT-OldSchoolEffect#3)

[vogella]

@DenisUngemach more examples to test your Skia work if you like

[DenisUngemach]

@DenisUngemach more examples to test your Skia work if you like

I have rebased the skija repo and checked them. It works.

But the particles look different, because the scaling in skia works with floats, which means 150% increases the size of points much more than in the classical canvas.