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Live coding at Creative Coding Singapore
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| <style> | |
| #b { | |
| position: fixed; | |
| top: 0; | |
| left: 0; | |
| width: 100%; | |
| height: 100%; | |
| background: radial-gradient(circle, #000, #123); | |
| } | |
| </style><audio id="a"></audio><canvas id="b"></canvas><script> | |
| c= b.getContext('2d'); | |
| 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(t=0;t<60;) { | |
| frac = (t&4 ? t*4 : t/2)%1; | |
| notesIndex += frac == 0; | |
| sample = Math.sin(notesFreq[notesIndex%notesFreq.length]*t *Math.PI*2) * (1-frac) * 16; | |
| frac = t*2%1; | |
| sample += (Math.random()-.5) * Math.max(0,1-frac*frac*frac*4) * 3; | |
| str+=String.fromCharCode(127+ sample); | |
| t += 1/16384; | |
| } | |
| a.src = 'data:audio/wav;base64,UklGRiQAAABXQVZFZm10IBAAAAABAAEAA' | |
| + 'EAAAABA' // 16khz | |
| + 'AAABAAgAZGF0YQAAAAAA' + btoa(str); | |
| a.play(); | |
| MAX = 2560; | |
| ps = []; | |
| for(i=0;i<MAX;i++) { | |
| ps.push({ | |
| x:(Math.random()*256-128)*3, | |
| y:(Math.random()*256-128)*3, | |
| z:(Math.random()*256-128)*3, | |
| i:i, | |
| u: i / 48 % 1, | |
| v: i / 48 / 48 | |
| }) | |
| } | |
| function render() { | |
| requestAnimationFrame(render); | |
| // clear and set viewport | |
| H = b.height = 512; | |
| W = b.width = 0| H * innerWidth/innerHeight; | |
| time = a.currentTime; | |
| c.translate(W/2,H/2); | |
| c.rotate( (time*2&13)/32 ); | |
| c.fillStyle = '#fff'; | |
| c.fillText([W,H,time],16,16); | |
| for(i=0;i<MAX;i++) { | |
| p = ps[i]; | |
| p.col = '#eee' | |
| if(p.v < 1) { | |
| pangle = p.u*Math.PI*2; | |
| // Sync on the hihat | |
| frac = time*2%1; | |
| sample = Math.max(0,1-frac*frac*frac*4); | |
| d = 96 + 32 * sample * Math.cos(time*3+p.v*Math.PI*2*2) * Math.cos(time*2+pangle*3); | |
| p.y = (p.v*256-128)*2.5; | |
| p.x = d*Math.cos(pangle); | |
| p.z = d*Math.sin(pangle); | |
| l = Math.sin(time*2+pangle*3); | |
| baseLight = 127+64*l|0 | |
| p.col = | |
| 'rgb('+[ | |
| baseLight+64*Math.cos(pangle)|0, | |
| baseLight+64*Math.cos(pangle+2)|0, | |
| baseLight+64*Math.cos(pangle+4)|0 | |
| ]+')' | |
| } | |
| p.rx = Math.cos(time) * p.x - Math.sin(time) * p.z; | |
| p.rz = Math.sin(time) * p.x + Math.cos(time) * p.z; | |
| p.ry = p.y; | |
| p.p = (p.rz+192) / 256; | |
| p.sx = p.p * p.rx; | |
| p.sy = p.p * p.ry; | |
| } | |
| ps.sort((a,b) => a.p-b.p); | |
| ps.forEach(p => { | |
| s = p.p*14; | |
| c.fillStyle = p.col; | |
| c.fillRect(p.sx,p.sy,s,s) | |
| }) | |
| } | |
| render(); | |
| </script> |
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In the 2nd revision the amplitude of bumps in U & V is synchronized with the hihats in the "music".
It's nothing really but it illustrate better what I said during the introduction talk about using ONE formula to drive the Visuals & Audio.