Pixi.js

A quick introduction to the JavaScript framework Pixi.js to create WebGL & Canvas 2D animations.

Transcript

1. Pixi.js Benoît Burgener @LeBenLeBen Front-end Meetup Romandie 11 September 2015
2. Benoît Burgener Front-end developer at Liip @LeBenLeBen
3. <canvas/>
4. • Element introduced with HTML5 • Bitmap • Dedicated JavaScript API: Canvas 2D context • Sub-features • Text • Blend modes
5. Source: http://caniuse.com/#feat=webgl Canvas browsers support
6. WebGL
7. MDN WebGL (Web Graphics Library) is a JavaScript API for rendering interactive 3D and 2D graphics within any compatible web browser without the use of plug-ins.
8. Source: http://caniuse.com/#feat=canvas WebGL browsers support
9. Pixi.js Version 2
10. Main features
11. 1. WebGL to Canvas fallback with renderer detection 2. Multiple resolutions support (for HDPI screens) 3. Assets loader 4. Click, touch, multi-touch 5. Filters, tinting, blend modes 6. Text 7. Sprite sheets
12. Renderer detection
13. var stage = new PIXI.Stage(backgroundColor);
 var renderer = new PIXI.autoDetectRenderer(width, height, …); -> PIXI.WebGLRenderer(…) —> PIXI.CanvasRenderer(…) renderer.render(stage); document.body.appendChild(renderer.view); var animate = function() { … } requestAnimationFrame( animate );
14. Resolution
15. var resolution = window.devicePixelRatio || 1; var renderer = new PIXI.autoDetectRenderer(width, height, { resolution: resolution }); if (resolution > 1) { jQuery(renderer.view).css({ 'transform': 'scale(' + 1/resolution + ')', 'transform-origin': '0 0' }); }
16. Assets loader
17. var loader = new PIXI.AssetLoader([ 'images/star.png', 'images/moon.png', 'images/stars.json' ]); loader.onProgress = fn; loader.onComplete = fn; loader.load();
18. Tinting
20. var texture = PIXI.Texture.fromImage('images/star.png'); var image = new PIXI.Sprite(texture); image.tint = '0xFFFFFF'; stage.addChild(image);
21. Text
22. • Multiple lines • Word wrapping • Alignment • Stroke • Drop shadow var text = new PIXI.Text( 'Lorem ipsum dolor sit amet', { fill: 'black', font: '30px BaskervilleOldFace', align: 'center' } ); stage.addChild(text);
23. Sprite sheets
27. 7038 × 4222
28. TexturePacker
29. • Create sprites from frames • Optimize images • Trim, rotate, … • Multi-pack (limited by max. image size) • Export in multiple formats (JSON Hash for Pixi)
30. Showcase…
31. Other useful resources
32. • PIXI.draggable • GSAP (GreenSock)
33. Questions? Or any experience you want to share?
34. Thanks! @LeBenLeBen