Created
April 10, 2013 20:38
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Save paultreny/5358231 to your computer and use it in GitHub Desktop.
A CodePen by Paul Reny. RESIST - (forked from GLITCH)
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| <body> | |
| <div id="wrapper"> | |
| <canvas id="stage"></canvas> | |
| </div> | |
| <script src="dat.gui.min.js"></script> | |
| <script src="resist.js"></script> | |
| </body> |
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| /* Based off of work on http://retromodular.com/ */ | |
| (function(){ | |
| var glitcher = { | |
| init: function () { | |
| setTimeout((function () { | |
| this.canvas = document.getElementById('stage'); | |
| this.context = this.canvas.getContext('2d'); | |
| this.initOptions(); | |
| this.resize(); | |
| this.tick(); | |
| }).bind(this), 100); | |
| }, | |
| initOptions: function () { | |
| var gui = new dat.GUI(), | |
| current = gui.addFolder('Current'), | |
| controls = gui.addFolder('Controls'); | |
| this.width = document.documentElement.offsetWidth; | |
| this.height = window.innerHeight; | |
| this.font = '900 12vw Orbitron'; /*this.font = 'bold 12vw Helvetica';*/ | |
| this.context.font = this.font; | |
| this.text = "RESIST" | |
| /* .split("").join(String.fromCharCode(8201)); */ | |
| this.textWidth = (this.context.measureText(this.text)).width; | |
| this.fps = 60; | |
| this.channel = 0; // 0 = red, 1 = green, 2 = blue | |
| this.compOp = 'lighter'; // CompositeOperation = lighter || darker || xor | |
| this.phase = 0.0; | |
| this.phaseStep = 0.05; //determines how often we will change channel and amplitude | |
| this.amplitude = 0.0; | |
| this.amplitudeBase = 2.0; | |
| this.amplitudeRange = 2.0; | |
| this.alphaMin = 0.8; | |
| this.glitchAmplitude = 20.0; | |
| this.glitchThreshold = 0.9; | |
| this.scanlineBase = 40; | |
| this.scanlineRange = 40; | |
| this.scanlineShift = 15; | |
| current.add(this, 'channel', 0, 2).listen(); | |
| current.add(this, 'phase', 0, 1).listen(); | |
| current.add(this, 'amplitude', 0, 5).listen(); | |
| var text = controls.add(this, 'text'); | |
| text.onChange((function (value) { | |
| this.textWidth = (this.context.measureText(this.text)).width; | |
| }).bind(this)); | |
| controls.add(this, 'fps', 1, 60); | |
| controls.add(this, 'phaseStep', 0, 1); | |
| controls.add(this, 'alphaMin', 0, 1); | |
| controls.add(this, 'amplitudeBase', 0, 5); | |
| controls.add(this, 'amplitudeRange', 0, 5); | |
| controls.add(this, 'glitchAmplitude', 0, 100); | |
| controls.add(this, 'glitchThreshold', 0, 1); | |
| controls.open(); | |
| // gui.close(); | |
| //gui.add(fizzyText, 'noiseStrength', 0, 100).listen(); | |
| }, | |
| tick: function () { | |
| setTimeout((function () { | |
| this.phase += this.phaseStep; | |
| if (this.phase > 1) { | |
| this.phase = 0.0; | |
| this.channel = (this.channel === 2) ? 0 : this.channel + 1; | |
| this.amplitude = this.amplitudeBase + (this.amplitudeRange * Math.random()); | |
| } | |
| this.render(); | |
| this.tick(); | |
| }).bind(this), 1000 / this.fps); | |
| }, | |
| render: function () { | |
| var x0 = this.amplitude * Math.sin((Math.PI * 2) * this.phase) >> 0, | |
| x1, x2, x3; | |
| if (Math.random() >= this.glitchThreshold) { | |
| x0 *= this.glitchAmplitude; | |
| } | |
| x1 = this.width - this.textWidth >> 1; | |
| x2 = x1 + x0; | |
| x3 = x1 - x0; | |
| this.context.clearRect(0, 0, this.width, this.height); | |
| this.context.globalAlpha = this.alphaMin + ((1 - this.alphaMin) * Math.random()); | |
| switch (this.channel) { | |
| case 0: | |
| this.renderChannels(x1, x2, x3); | |
| break; | |
| case 1: | |
| this.renderChannels(x2, x3, x1); | |
| break; | |
| case 2: | |
| this.renderChannels(x3, x1, x2); | |
| break; | |
| } | |
| // if (Math.floor(Math.random() * 2)) { | |
| this.renderScanline(); | |
| // } | |
| }, | |
| renderChannels: function (x1, x2, x3) { | |
| this.context.font = this.font; | |
| this.context.fillStyle = "rgb(255,0,0)"; | |
| this.context.fillText(this.text, x1, this.height / 2); | |
| this.context.globalCompositeOperation = this.compOp; | |
| this.context.fillStyle = "rgb(0,255,0)"; | |
| this.context.fillText(this.text, x2, this.height / 2); | |
| this.context.fillStyle = "rgb(0,0,255)"; | |
| this.context.fillText(this.text, x3, this.height / 2); | |
| }, | |
| renderScanline: function () { | |
| var y = this.height * Math.random() >> 0, | |
| o = this.context.getImageData(0, y, this.width, 1), | |
| d = o.data, | |
| i = d.length, | |
| s = this.scanlineBase + this.scanlineRange * Math.random() >> 0, | |
| x = -this.scanlineShift + this.scanlineShift * 2 * Math.random() >> 0; | |
| while (i-- > 0) { | |
| d[i] += s; | |
| } | |
| this.context.putImageData(o, x, y); | |
| }, | |
| resize: function () { | |
| if (this.canvas) { | |
| this.canvas.width = document.documentElement.offsetWidth; | |
| this.canvas.height = window.innerHeight; | |
| } | |
| } | |
| }; | |
| document.onload = glitcher.init(); | |
| window.onresize = glitcher.resize(); | |
| })(); |
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| body { | |
| background: black; | |
| overflow: hidden; | |
| margin: 0; | |
| padding: 0; | |
| } | |
| #wrapper { | |
| width: 100%; | |
| /*max-width: 1200px;*/ | |
| padding: 0; | |
| margin: 0; | |
| text-align: center; | |
| } | |
| img { | |
| display: none; | |
| } | |
| canvas { | |
| /*box-sizing: border-box;*/ | |
| padding: 40px 100px 0 0; | |
| margin: 10px auto 0; | |
| text-align: center; | |
| max-width: 100%; | |
| } |
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