Cross platform, touch optimized 2D & 3D visualization

Cross platform, touch optimized 2D & 3D visualization made with HTML5 Canvas, WebGL and Three.js.

Transcript

1. 2D & 3D VISUALIZATIONS CROSS PLATFORM, TOUCH OPTIMIZED Christian Liebel, Christian Weyer, Manuel Rauber thinktecture.com
2. INTRODUCTION Christian Liebel Christian Weyer Manuel Rauber christian.liebel@thinktecture.com @chris_liebel christian.weyer@thinktecture.com @christianweyer manuel.rauber@thinktecture.com @manuelrauber
3. TALKING POINTS 2D 3D Overview Browser support, performance API Basics, retina scaling, animation, interaction Examples Overview Basics WebGL & three.js Browser support, controls Examples
4. 2D VISUALIZATION HTML5 CANVAS Manuel Rauber @manuelrauber
5. OVERVIEW Plain bitmap for the web Cross platform graphic manipulations High performance Mouse, touch & gamepad support Low energy consumpting animations
6. BROWSER SUPPORT (BASIC) From http://caniuse.com/#search=canvas
7. BROWSER SUPPORT (OVERALL) From http://caniuse.com/#search=canvas
8. PERFORMANCE CHROME @ MACBOOK PRO From http://jsperf.com/html-vs-svg-vs-canvas/31
9. PERFORMANCE ANDROID @ SAMSUNG GALAXY NOTE From http://jsperf.com/html-vs-svg-vs-canvas/31
10. COORDINATE SYSTEM Cartesian: (0/0) bottom left Canvas: (0/0) top left From http://www.sitepoint.com/html5-canvas-tutorial-introduction/
11. USAGE < ! D O C T Y P E h t m l > < h t m l > < h e a d > < t i t l e > C a n v a s ! < / t i t l e > < / h e a d > < b o d y > < c a n v a s > < / c a n v a s > < / b o d y > < / h t m l >
12. FALLBACK < ! D O C T Y P E h t m l > < h t m l > < h e a d > < t i t l e > C a n v a s ! < / t i t l e > < / h e a d > < b o d y > < c a n v a s > T h i s t e x t i s s h o w n , w h e n a b r o w s e r d o e s n o t s u p p o r t c a n v a s . < / c a n v a s > < / b o d y > < / h t m l >
13. CONTEXTS 2D context: CanvasRenderingContext2D v a r c o n t e x t = c a n v a s . g e t C o n t e x t ( ' 2 d ' ) ; WebGL context: WebGLRenderingContext v a r c o n t e x t = c a n v a s . g e t C o n t e x t ( ' w e b g l ' ) ;
14. API DRAWING v o i d f i l l R e c t ( x , y , w i d t h , h e i g h t ) ; v o i d s t r o k e R e c t ( x , y , w i d t h , h e i g h t ) ; v o i d c l e a r R e c t ( x , y , w i d t h , h e i g h t ) ; v o i d f i l l T e x t ( t e x t , x , y [ , m a x W i d t h ] ) ; v o i d s t r o k e T e x t ( t e x t , x , y [ , m a x W i d t h ] ) ; MDN: CanvasRenderingContext2D
15. API PATHS v o i d b e g i n P a t h ( ) ; v o i d c l o s e P a t h ( ) ; v o i d m o v e T o ( x , y ) ; v o i d l i n e T o ( x , y ) ; v o i d b e z i e r C u r v e T o ( c p 1 x , c p 1 y , c p 2 x , c p 2 y , x , y ) ; v o i d r e c t ( x , y , w i d t h , h e i g h t ) ; v o i d f i l l ( ) ; v o i d s t r o k e ( ) ; MDN: CanvasRenderingContext2D
16. API PIXEL MANIPULATION I m a g e D a t a c r e a t e I m a g e D a t a ( w i d t h , h e i g h t ) ; I m a g e D a t a g e t I m a g e D a t a ( s x , s y , s w , s h ) ; v o i d p u t I m a g e D a t a ( i m a g e d a t a , d x , d y ) ; MDN: CanvasRenderingContext2D
17. RETINA SUPPORT
19. RETINA - HOW TO f u n c t i o n a d j u s t F o r R e t i n a ( ) { i f ( ! w i n d o w . d e v i c e P i x e l R a t i o | | w i n d o w . d e v i c e P i x e l R a t i o < = 1 ) { r e t u r n ; } v a r w i d t h = c a n v a s . w i d t h ; v a r h e i g h t = c a n v a s . h e i g h t ; c a n v a s . s t y l e . w i d t h = w i d t h + ' p x ' ; c a n v a s . s t y l e . h e i g h t = h e i g h t + ' p x ' ; c a n v a s . w i d t h = w i d t h * w i n d o w . d e v i c e P i x e l R a t i o ; c a n v a s . h e i g h t = h e i g h t * w i n d o w . d e v i c e P i x e l R a t i o ; c o n t e x t . s c a l e ( w i n d o w . d e v i c e P i x e l R a t i o , w i n d o w . d e v i c e P i x e l R a t i o ) ; }
20. ANIMATIONS THE OLD WAY setTimeout f u n c t i o n d r a w ( ) { / / d r a w r o u t i n e s e t T i m e o u t ( d r a w , 1 0 0 0 / 6 0 ) ; } setInterval s e t I n t e r v a l ( f u n c t i o n ( ) { / / d r a w r o u t i n e } , 1 0 0 0 / 6 0 ) ;
21. ANIMATIONS THE MODERN WAY requestAnimationFrame v a r a n i m a t i o n F r a m e ; f u n c t i o n s t a r t A n i m a t i o n ( ) { v a r s t e p = f u n c t i o n ( ) { / / d r a w r o u t i n e a n i m a t i o n F r a m e = w i n d o w . r e q u e s t A n i m a t i o n F r a m e ( s t e p ) ; } a n i m a t i o n F r a m e = w i n d o w . r e q u e s t A n i m a t i o n F r a m e ( s t e p ) ; } f u n c t i o n s t o p A n i m a t i o n ( ) { w i n d o w . c a n c e l A n i m a t i o n F r a m e ( a n i m a t i o n F r a m e ) ; } MDN: , requestAnimationFrame cancelAnimationFrame
22. ANIMATIONS PROBLEMS WITH "OLD" TECHNIQUES If the callback function takes longer than the timer will call it, the callback function gets queued. Could lead quickly to an "infinite" amount of queued callback functions. Timers continue to work in background tabs, the browser will render invisible animations (wastage of CPU and battery life). Especially bad for mobile devices. From https://dev.opera.com/articles/better-performance-with-requestanimationframe/
23. ANIMATIONS WHAT REQUESTANIMATIONFRAME DOES Only executed when visible to the user (will stop in background tabs!). No wastage of CPU and battery life. Frame is only drawn when browser is ready and no other frame waits for drawing. No "infinite" amount of queued callback functions. From https://dev.opera.com/articles/better-performance-with-requestanimationframe/
24. ANIMATIONS WHAT REQUESTANIMATIONFRAME DOESN'T DO As the name suggests: Only one frame is requested. r e q u e s t A n i m a t i o n F r a m e has to be called within the callback to get an animation loop. You don't know, when the callback will be executed. Animations on the same page, where one is in the visible area and one not, will not run synchronously since the hidden one's r e q u e s t A n i m a t i o n F r a m e will not be called. From https://dev.opera.com/articles/better-performance-with-requestanimationframe/
25. INTERACTION KEYBOARD & MOUSE SUPPORT Canvas supports all keyboard & mouse events like k e y d o w n , k e y u p , m o u s e d o w n or m o u s e m o v e . c a n v a s . a d d E v e n t L i s t e n e r ( ' m o u s e m o v e ' , f u n c t i o n ( m o u s e E v e n t ) { / / m o u s e e v e n t r o u t i n e } ) ; c a n v a s . a d d E v e n t L i s t e n e r ( ' k e y d o w n ' , f u n c t i o n ( k e y E v e n t ) { / / k e y d o w n e v e n t r o u t i n e } ) ; MDN: , MouseEvent KeyboardEvent
26. INTERACTION TOUCH Canvas supports all touch events like t o u c h s t a r t , t o u c h m o v e , t o u c h e n d . Consider using a library for recognizing gestures like . HammerJS c a n v a s . a d d E v e n t L i s t e n e r ( ' t o u c h m o v e ' , f u n c t i o n ( t o u c h E v e n t ) { / / t o u c h m o v e e v e n t r o u t i n e } ) ; MDN: , Touch events TouchEvent
27. EXAMPLES WITHIN GITHUB REPOSITORY 1. Basic circle 2. Circle with gradient 3. Retina support 4. requestAnimationFrame 5. Time-based animations 6. Mouse Move 7. Touch Move 8. Manipulating a rectangle with HammerJS
28. EXAMPLES WITHIN THE WEB Gesture recognition: Video explosion: Zen Photon Garden: Zoom Charts: Many more examples @ http://revealjs.herokuapp.com/ http://www.craftymind.com/factory/html5video/CanvasVideo http://zenphoton.com/ https://zoomcharts.com/developers/en/net- chart/examples/items/link-items.html http://www.canvasdemos.com/
29. VIDEO EXPLOSION From http://www.craftymind.com/factory/html5video/CanvasVideo.html
30. ZEN PHOTON GARDEN From http://zenphoton.com/
31. ZOOM CHARTS From https://zoomcharts.com/developers/en/net-chart/examples/items/link-items.html
32. LIVE DEMO
33. 3D VISUALIZATION Christian Liebel @chris_liebel
34. 3D CONTENT IN A 3D WORLD WITH 2D SCREENS scenes, cameras, rendering
35. COORDINATE SYSTEM Right-handed From https://msdn.microsoft.com/library/dn479430(v=vs.85).aspx
36. CAMERA FRUSTUM From https://msdn.microsoft.com/library/dn479430(v=vs.85).aspx
37. WEBGL Web Graphics Library Hardware accelerated (GPU) New canvas rendering context w e b g l
38. PROVEN TECHNOLOGY Based on OpenGL for Embedded Systems Blender & Unity can export to WebGL ANGLE (Chrome/Firefox): Rendering on Direct3D
39. THREE.JS Native WebGL is complex Open-source JavaScript library High-level API abstracting WebGL (and more)
40. STRUCTURE Geometry: shape (cube, sphere, …) Material: color, texture, light reflection Mesh: 3D object (geometry + material)
41. BROWSER SUPPORT From http://caniuse.com/#search=webgl
42. MOBILE PLATFORM SUPPORT iOS 8+ Android WebView 36+ Crosswalk Windows (Phone) 8.1+
43. CONTROLS Mouse/Keyboard Touch Gamepad
44. A WORD ON TOUCH EVENTS… Pointer Events vs. Touch Events Browser support varies on desktop three.js controls only support Touch Events
45. A WORD ON GAMEPADS… HTML5 Gamepad API Polling (requestAnimationFrame) Supported by Chrome, Firefox, MS Edge, Opera
46. THE CREATION OF THE WORLD
47. EVEN MORE SAMPLES… Flight Arcade Physijs three.js samples
48. SUMMARY Cross platform high-performance graphic manipulation 2D & 3D Hardware acceleration Supported by all major browsers Touch-enabled, gamepad-enabled
49. THANK YOU! GitHub repository: https://github.com/thinktecture/DotNetUserGroupKA2015 thinktecture.com
50. RESOURCES GitHub repository: Canvas browser support: Cordova: Ionic: Gulp: TypeScript: CanvasRenderingContext2D: WebGLRenderingContext: requestAnimationFrame: https://github.com/thinktecture/DotNetUserGroupKA2015 http://caniuse.com/#search=canvas https://cordova.apache.org/ http://ionicframework.com/ http://gulpjs.com http://www.typescriptlang.org/ https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D https://developer.mozilla.org/en/docs/Web/API/WebGLRenderingContext https://developer.mozilla.org/en- US/docs/Web/API/window/requestAnimationFrame