wavesurfer.js

<!doctype html> <html lang="en"> <head> <title>Code coverage report for src/drawer.multicanvas.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../prettify.css" /> <link rel="stylesheet" href="../base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="../index.html">all files</a> / <a href="index.html">src/</a> drawer.multicanvas.js </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 1.43% Statements 2/140 </div> <div class='fl pad1y space-right2'> 0% Branches 0/52 </div> <div class='fl pad1y space-right2'> 0% Functions 0/19 </div> <div class='fl pad1y space-right2'> 1.48% Lines 2/135 </div> </div> </div> <div class='status-line low'></div> <pre><table class="coverage"> <tr><td class="line-count quiet">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317</td><td class="line-coverage quiet">    1×   1×                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                </td><td class="text"><pre class="prettyprint lang-js">'use strict';   WaveSurfer.Drawer.MultiCanvas = Object.create(WaveSurfer.Drawer);   WaveSurfer.util.extend(WaveSurfer.Drawer.MultiCanvas, {   initDrawer: function (params) { this.maxCanvasWidth = params.maxCanvasWidth != null ? params.maxCanvasWidth : 4000; this.maxCanvasElementWidth = Math.round(this.maxCanvasWidth / this.params.pixelRatio);   if (this.maxCanvasWidth <= 1) { throw 'maxCanvasWidth must be greater than 1.'; } else if (this.maxCanvasWidth % 2 == 1) { throw 'maxCanvasWidth must be an even number.'; }   this.hasProgressCanvas = this.params.waveColor != this.params.progressColor; this.halfPixel = 0.5 / this.params.pixelRatio; this.canvases = []; },   createElements: function () { this.progressWave = this.wrapper.appendChild( this.style(document.createElement('wave'), { position: 'absolute', zIndex: 2, left: 0, top: 0, bottom: 0, overflow: 'hidden', width: '0', display: 'none', boxSizing: 'border-box', borderRightStyle: 'solid', borderRightWidth: this.params.cursorWidth + 'px', borderRightColor: this.params.cursorColor }) );   this.addCanvas(); },   updateSize: function () { var totalWidth = Math.round(this.width / this.params.pixelRatio), requiredCanvases = Math.ceil(totalWidth / this.maxCanvasElementWidth);   while (this.canvases.length < requiredCanvases) { this.addCanvas(); }   while (this.canvases.length > requiredCanvases) { this.removeCanvas(); }   for (var i in this.canvases) { // Add some overlap to prevent vertical white stripes, keep the width even for simplicity. var canvasWidth = this.maxCanvasWidth + 2 * Math.ceil(this.params.pixelRatio / 2);   if (i == this.canvases.length - 1) { canvasWidth = this.width - (this.maxCanvasWidth * (this.canvases.length - 1)); }   this.updateDimensions(this.canvases[i], canvasWidth, this.height); this.clearWaveForEntry(this.canvases[i]); } },   addCanvas: function () { var entry = {}, leftOffset = this.maxCanvasElementWidth * this.canvases.length;   entry.wave = this.wrapper.appendChild( this.style(document.createElement('canvas'), { position: 'absolute', zIndex: 1, left: leftOffset + 'px', top: 0, bottom: 0 }) ); entry.waveCtx = entry.wave.getContext('2d');   if (this.hasProgressCanvas) { entry.progress = this.progressWave.appendChild( this.style(document.createElement('canvas'), { position: 'absolute', left: leftOffset + 'px', top: 0, bottom: 0 }) ); entry.progressCtx = entry.progress.getContext('2d'); }   this.canvases.push(entry); },   removeCanvas: function () { var lastEntry = this.canvases.pop(); lastEntry.wave.parentElement.removeChild(lastEntry.wave); if (this.hasProgressCanvas) { lastEntry.progress.parentElement.removeChild(lastEntry.progress); } },   updateDimensions: function (entry, width, height) { var elementWidth = Math.round(width / this.params.pixelRatio), totalWidth = Math.round(this.width / this.params.pixelRatio);   // Where the canvas starts and ends in the waveform, represented as a decimal between 0 and 1. entry.start = (entry.waveCtx.canvas.offsetLeft / totalWidth) || 0; entry.end = entry.start + elementWidth / totalWidth;   entry.waveCtx.canvas.width = width; entry.waveCtx.canvas.height = height; this.style(entry.waveCtx.canvas, { width: elementWidth + 'px'});   this.style(this.progressWave, { display: 'block'});   if (this.hasProgressCanvas) { entry.progressCtx.canvas.width = width; entry.progressCtx.canvas.height = height; this.style(entry.progressCtx.canvas, { width: elementWidth + 'px'}); } },   clearWave: function () { for (var i in this.canvases) { this.clearWaveForEntry(this.canvases[i]); } },   clearWaveForEntry: function (entry) { entry.waveCtx.clearRect(0, 0, entry.waveCtx.canvas.width, entry.waveCtx.canvas.height); if (this.hasProgressCanvas) { entry.progressCtx.clearRect(0, 0, entry.progressCtx.canvas.width, entry.progressCtx.canvas.height); } },   drawBars: function (peaks, channelIndex) { // Split channels if (peaks[0] instanceof Array) { var channels = peaks; if (this.params.splitChannels) { this.setHeight(channels.length * this.params.height * this.params.pixelRatio); channels.forEach(this.drawBars, this); return; } else { peaks = channels[0]; } }   // Bar wave draws the bottom only as a reflection of the top, // so we don't need negative values var hasMinVals = [].some.call(peaks, function (val) { return val < 0; }); if (hasMinVals) { peaks = [].filter.call(peaks, function (_, index) { return index % 2 == 0; }); }   // A half-pixel offset makes lines crisp var width = this.width; var height = this.params.height * this.params.pixelRatio; var offsetY = height * channelIndex || 0; var halfH = height / 2; var length = peaks.length; var bar = this.params.barWidth * this.params.pixelRatio; var gap = Math.max(this.params.pixelRatio, ~~(bar / 2)); var step = bar + gap;   var absmax = 1; if (this.params.normalize) { absmax = WaveSurfer.util.max(peaks); }   var scale = length / width;   for (var i = 0; i < width; i += step) { var h = Math.round(peaks[Math.floor(i * scale)] / absmax * halfH); this.fillRect(i + this.halfPixel, halfH - h + offsetY, bar + this.halfPixel, h * 2); } },   drawWave: function (peaks, channelIndex) { // Split channels if (peaks[0] instanceof Array) { var channels = peaks; if (this.params.splitChannels) { this.setHeight(channels.length * this.params.height * this.params.pixelRatio); channels.forEach(this.drawWave, this); return; } else { peaks = channels[0]; } }   // Support arrays without negative peaks var hasMinValues = [].some.call(peaks, function (val) { return val < 0; }); if (!hasMinValues) { var reflectedPeaks = []; for (var i = 0, len = peaks.length; i < len; i++) { reflectedPeaks[2 * i] = peaks[i]; reflectedPeaks[2 * i + 1] = -peaks[i]; } peaks = reflectedPeaks; }   // A half-pixel offset makes lines crisp var height = this.params.height * this.params.pixelRatio; var offsetY = height * channelIndex || 0; var halfH = height / 2;   var absmax = 1; if (this.params.normalize) { var max = WaveSurfer.util.max(peaks); var min = WaveSurfer.util.min(peaks); absmax = -min > max ? -min : max; }   this.drawLine(peaks, absmax, halfH, offsetY);   // Always draw a median line this.fillRect(0, halfH + offsetY - this.halfPixel, this.width, this.halfPixel); },   drawLine: function (peaks, absmax, halfH, offsetY) { for (var index in this.canvases) { var entry = this.canvases[index];   this.setFillStyles(entry);   this.drawLineToContext(entry, entry.waveCtx, peaks, absmax, halfH, offsetY); this.drawLineToContext(entry, entry.progressCtx, peaks, absmax, halfH, offsetY); } },   drawLineToContext: function (entry, ctx, peaks, absmax, halfH, offsetY) { if (!ctx) { return; }   var length = peaks.length / 2;   var scale = 1; if (this.params.fillParent && this.width != length) { scale = this.width / length; }   var first = Math.round(length * entry.start), last = Math.round(length * entry.end);   ctx.beginPath(); ctx.moveTo(this.halfPixel, halfH + offsetY);   for (var i = first; i < last; i++) { var h = Math.round(peaks[2 * i] / absmax * halfH); ctx.lineTo((i - first) * scale + this.halfPixel, halfH - h + offsetY); }   // Draw the bottom edge going backwards, to make a single // closed hull to fill. for (var i = last - 1; i >= first; i--) { var h = Math.round(peaks[2 * i + 1] / absmax * halfH); ctx.lineTo((i - first) * scale + this.halfPixel, halfH - h + offsetY); }   ctx.closePath(); ctx.fill(); },   fillRect: function (x, y, width, height) { for (var i in this.canvases) { var entry = this.canvases[i], leftOffset = i * this.maxCanvasWidth;   var intersection = { x1: Math.max(x, i * this.maxCanvasWidth), y1: y, x2: Math.min(x + width, i * this.maxCanvasWidth + entry.waveCtx.canvas.width), y2: y + height };   if (intersection.x1 < intersection.x2) { this.setFillStyles(entry);   this.fillRectToContext(entry.waveCtx, intersection.x1 - leftOffset, intersection.y1, intersection.x2 - intersection.x1, intersection.y2 - intersection.y1);   this.fillRectToContext(entry.progressCtx, intersection.x1 - leftOffset, intersection.y1, intersection.x2 - intersection.x1, intersection.y2 - intersection.y1); } } },   fillRectToContext: function (ctx, x, y, width, height) { if (!ctx) { return; } ctx.fillRect(x, y, width, height); },   setFillStyles: function (entry) { entry.waveCtx.fillStyle = this.params.waveColor; if (this.hasProgressCanvas) { entry.progressCtx.fillStyle = this.params.progressColor; } },   updateProgress: function (progress) { var pos = Math.round( this.width * progress ) / this.params.pixelRatio; this.style(this.progressWave, { width: pos + 'px' }); } });  </pre></td></tr> </table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="http://istanbul-js.org/" target="_blank">istanbul</a> at Sat Oct 01 2016 11:49:33 GMT+0200 (CEST) </div> </div> <script src="../prettify.js"></script> <script> window.onload = function () { if (typeof prettyPrint === 'function') { prettyPrint(); } }; </script> <script src="../sorter.js"></script> </body> </html>