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LIVE code at FRAMSIA - 20160127
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| <style> | |
| #b { | |
| position: fixed; | |
| top: 0; | |
| left: 0; | |
| width: 100%; | |
| height: 100%; | |
| background: radial-gradient(circle, #345, #201); | |
| } | |
| </style><audio id="a"></audio><canvas id="b"></canvas><script> | |
| str=''; | |
| notesFreq = [155,195,261,155,233,155,195,207,195,207,195,207,195,207,195,261,155,233,155,233,261,155,233,155,233,155,233,261,155,195,261,195,207,195,261,155,233,155,233,155,195,207,233,155,233,155,195,207,195,207,233,261,155,233,261,233,261,155,195,207,195,207,195,207,195,261,233,155,195,207,233,261,233,155,233,261,155,195,207,195,261,155,233,261,155,233,261,195,261,233,261,155,233,155,195,207,233,261,233,155,195,261,233,155,195,261,195,261,155,233,261,195,207,233,261,195,207,195,261,233,155,195,261,155,195,207,195,261]; | |
| notesIndex = 0; | |
| for(time=0;time<60;time+=1/16384) { | |
| frac= (time&4?time*6:time*4)%1; | |
| notesIndex += frac==0; | |
| sample = (time * notesFreq[notesIndex%notesFreq.length] % 1) * (1 - frac) * 16; | |
| frac = time*2%1; | |
| sample += (Math.random()) * Math.pow(1-frac, 8) * 16; | |
| str += String.fromCharCode(sample + 127); | |
| } | |
| a.src = 'data:audio/wav;base64,UklGRiQAAABXQVZFZm10IBAAAAABAAEAA' | |
| + 'EAAAABA' // 16khz | |
| + 'AAABAAgAZGF0YQAAAAAA' + btoa(str); | |
| a.play(); | |
| c=b.getContext('2d'); | |
| ps = []; | |
| COUNT = 2560; | |
| for(i=0;i<COUNT; i++) { | |
| ps.push({ | |
| x: (Math.random()-.5)*256 * 2, | |
| y: (Math.random()-.5)*256 * 2, | |
| z: (Math.random()-.5)*256 * 2, | |
| u: i / 48 % 1, | |
| v: i / 48 / 48, | |
| col: i & 1 ? '#eee' : '#ddd' | |
| }) | |
| }; | |
| render = function() { | |
| requestAnimationFrame(render); | |
| time = a.currentTime; | |
| H=b.height=512; | |
| W=b.width=0|innerWidth/innerHeight*H; | |
| c.translate(W/2,H/2); | |
| angle = time; | |
| c.rotate((angle&13)/32); | |
| ps.forEach(p => { | |
| if (p.v < 1) { | |
| an = p.u*Math.PI*2; | |
| frac = time*2%1; | |
| frac = Math.pow(1-frac, 2); | |
| d = 64 + frac * 32 * Math.cos(an*4)*Math.cos(p.v*6+time*4); | |
| p.x = d*Math.cos(an); | |
| p.z = d*Math.sin(an); | |
| p.y = 384*(p.v-.5); | |
| p.col = 'rgb('+ | |
| [255-d*4|0, | |
| 255-d*4|0, | |
| 255-d*4|0] +')' | |
| } | |
| p.rx = Math.cos(angle) * p.x - Math.sin(angle) * p.z; | |
| p.rz = Math.sin(angle) * p.x + Math.cos(angle) * p.z; | |
| p.ry = p.y; | |
| p.p = (384+p.rz)/256; | |
| p.sx = p.p*p.rx; | |
| p.sy = p.p*p.ry; | |
| }); | |
| ps.sort((a, b) => a.rz - b.rz) | |
| ps.forEach(p => { | |
| c.shadowColor = c.fillStyle = p.col; | |
| s = p.p*8; | |
| c.shadowBlur = p.v < 1 ? 0 : s; | |
| c.fillRect(p.sx,p.sy,s,s); | |
| }) | |
| } | |
| render(); | |
| </script> |
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