|
| 1 | +<!DOCTYPE html> |
1 | 2 | <html> |
2 | | -<body> |
3 | | -<h2>Hello World!</h2> |
4 | | -</body> |
| 3 | + <head> |
| 4 | + <style> |
| 5 | + video, canvas { |
| 6 | + margin-top: 25px; |
| 7 | + width: 400px; |
| 8 | + height: 224px; |
| 9 | + border: 1px solid black; |
| 10 | + } |
| 11 | + </style> |
| 12 | + <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script> |
| 13 | + </head> |
| 14 | + <body> |
| 15 | + <video id="video-canvas-fancy" controls> |
| 16 | + <source src="video/video.webm" type='video/webm; codecs="vp8, vorbis"' /> |
| 17 | + </video> |
| 18 | + <canvas id="canvas-copy-fancy"></canvas> |
| 19 | + <canvas id="canvas-draw-fancy"></canvas> |
| 20 | + <script> |
| 21 | + var video_dom = document.querySelector('#video-canvas-fancy'); |
| 22 | + var canvas_copy = document.querySelector('#canvas-copy-fancy'); |
| 23 | + var canvas_draw = document.querySelector('#canvas-draw-fancy'); |
| 24 | + var draw_interval = null; |
| 25 | + var ctx_copy = null; |
| 26 | + var ctx_draw = null; |
| 27 | + |
| 28 | + var offsets = []; |
| 29 | + var inertias = []; |
| 30 | + var slices = 4; |
| 31 | + var out_padding = 100; |
| 32 | + var interval = null; |
| 33 | + |
| 34 | + var inertia = -2.0; |
| 35 | + |
| 36 | + video_dom.addEventListener('canplay', function() { |
| 37 | + canvas_copy.width = canvas_draw.width = video_dom.videoWidth; |
| 38 | + canvas_copy.height = video_dom.videoHeight; |
| 39 | + canvas_draw.height = video_dom.videoHeight + out_padding; |
| 40 | + ctx_copy = canvas_copy.getContext('2d'); |
| 41 | + ctx_draw = canvas_draw.getContext('2d'); |
| 42 | + }, false); |
| 43 | + |
| 44 | + |
| 45 | + for (var i = 0; i < slices; i++) { |
| 46 | + offsets[i] = 0; |
| 47 | + inertias[i] = inertia; |
| 48 | + inertia += 0.4; |
| 49 | + } |
| 50 | + |
| 51 | + video_dom.addEventListener('play', function() { |
| 52 | + processEffectFrame(); |
| 53 | + if (interval == null) { |
| 54 | + interval = window.setInterval(function() { processEffectFrame() }, 33); |
| 55 | + } |
| 56 | + }, false); |
| 57 | + |
| 58 | + function processEffectFrame() { |
| 59 | + var slice_width = video_dom.videoWidth / slices; |
| 60 | + ctx_copy.drawImage(video_dom, 0 ,0); |
| 61 | + ctx_draw.clearRect(0, 0, canvas_draw.width, canvas_draw.height); |
| 62 | + for (var i = 0; i < slices; i++) { |
| 63 | + var sx = i * slice_width; |
| 64 | + var sy = 0; |
| 65 | + var sw = slice_width; |
| 66 | + var sh = video_dom.videoHeight; |
| 67 | + var dx = sx; |
| 68 | + var dy = offsets[i] + sy + out_padding; |
| 69 | + var dw = sw; |
| 70 | + var dh = sh; |
| 71 | + ctx_draw.drawImage(canvas_copy, sx, sy, sw, sh, dx, dy, dw, dh); |
| 72 | + if (Math.abs(offsets[i] + inertias[i]) < out_padding) { |
| 73 | + offsets[i] += inertias[i]; |
| 74 | + } else { |
| 75 | + inertias[i] = -inertias[i]; |
| 76 | + } |
| 77 | + } |
| 78 | + }; |
| 79 | + |
| 80 | + video_dom.addEventListener('pause', function() { |
| 81 | + window.clearInterval(interval); |
| 82 | + interval = null; |
| 83 | + }, false); |
| 84 | + |
| 85 | + video_dom.addEventListener('ended', function() { |
| 86 | + clearInterval(interval); |
| 87 | + }, false); |
| 88 | + </script> |
| 89 | + </body> |
5 | 90 | </html> |
| 91 | + |
0 commit comments