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Another Inlet
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{"description":"Another Inlet","endpoint":"","display":"webgl","public":true,"require":[],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"tab":"edit","display_percent":0.59513888888889,"play":false,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"period","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01,"hidepanel":false} |
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var domain = d3.range(0,Math.PI,0.1); | |
var data = []; | |
for (i in domain) { | |
p = domain[i]; | |
data.push(Math.abs(Math.cos(p)*9.8)*(-1)); | |
} | |
//console.log(data); // simulate drop data | |
//http://newcome.wordpress.com/2009/11/04/simple-fourier-transform-in-javascript/ | |
function fourier( in_array ) { | |
var len = in_array.length; | |
var output = []; | |
for( var k=0; k < len; k++ ) { | |
var real = 0; | |
var imag = 0; | |
for( var n=0; n < len; n++ ) { | |
real += in_array[n]*Math.cos(-2*Math.PI*k*n/len); | |
imag += in_array[n]*Math.sin(-2*Math.PI*k*n/len); | |
} | |
output.push( [ real, imag ] ) | |
} | |
return output; | |
} | |
var tscale = d3.scale.linear() | |
.domain([0,data.length]) | |
.range(["#00FF00", "#FF0000"]) | |
.interpolate(d3.interpolateHsl); | |
var pr = 12; | |
function makeCube(t,pos) { | |
var col = parseInt(tscale(t).slice(1,7), 16); | |
var materials = d3.range(6).map(function(d) { | |
return new THREE.MeshBasicMaterial( { color: col } ) | |
}) | |
var cube = new THREE.Mesh( new THREE.CubeGeometry( pr, pr, pr, 1, 1, 1, materials ), new THREE.MeshFaceMaterial() ); | |
tributary.scene.add( cube ); | |
cube.position = pos; | |
return cube; | |
} | |
var zoom = 9; | |
var newdata = []; | |
var mean = d3.mean(data); | |
for (d in data) { | |
var cube = makeCube(d,{x:d*zoom-300, y:data[d]+200 , z:0}); | |
newdata.push(data[d]-mean); | |
} | |
var f = fourier(newdata); | |
N = data.length; | |
//http://www.adamsiembida.com/node/23 | |
//http://tech.groups.yahoo.com/group/SeattleRobotics/message/44971 | |
//http://www.edaboard.com/thread107784.html | |
var locs = []; | |
for (d in f) { | |
// FFT to x in frequency domain | |
var location = Math.abs(f[d][0]) / Math.pow((2*Math.PI*N),2); | |
locs.push(location); | |
} | |
// inverse fft 1/N*fft to translate frequency back to time domain | |
ifft = fourier(locs); | |
locs = [] | |
for (l in ifft) { | |
locs.push(ifft[l][0]/N); | |
} | |
for (d in locs) { | |
var cube = makeCube(d,{x:d*zoom-300, y:locs[d]-100 , z:0}); | |
} | |
console.log(data); | |
console.log(locs); |
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