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@tophtucker

tophtucker/README.md

Last active Jan 28, 2018
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Brightness rotation
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title></title>
<link rel="stylesheet" type="text/css" href="style.css"/>
<body>
<div class=pair>
<img src="dove.jpg">
<canvas></canvas>
</div>
</body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="sylvester.js"></script>
<script src="script.js" charset="utf-8"></script>
</html>
// ripped/"adapted" from https://www.productchart.com/blog/2017-12-19-images
var pairs = document.querySelectorAll('.pair');
for (var i = 0; i < pairs.length; i++) {
var image = pairs[i].querySelector('img');
if (image.complete && image.src) {
doThisPair(pairs[i]);
} else {
image.addEventListener("load", e => doThisPair(e.target.parentNode));
}
}
function doThisPair(pair) {
var image = pair.querySelector('img');
var canvas = pair.querySelector('canvas');
transform(image, canvas);
}
function transform(image,canvas) {
var w = image.naturalWidth;
var h = image.naturalHeight;
// Scale to width 400:
w = 400;
h = Math.floor(h/image.naturalWidth*400);
image.width=w;
image.height=h;
image.style.height=h+"px";
canvas.width =w;
canvas.height=h;
canvas.style.height=h+"px";
ctx = canvas.getContext('2d');
ctx.drawImage(image,0,0,w,h);
dataIn =ctx.getImageData(0,0,canvas.width,canvas.height);
dataOut=ctx.getImageData(0,0,canvas.width,canvas.height);
dataOut = blankImageData(dataOut)
// ctx.putImageData(blankImageData(dataOut),0,0);
var vectors = []
d3.range(dataIn.data.length / 4).forEach(d => {
var offset = d * 4
var x = d % dataIn.width
var y = Math.floor(d / dataIn.width)
var brightness = (dataIn.data[offset] + dataIn.data[offset+1] + dataIn.data[offset+3]) / (255 * 3) * dataIn.width
vectors.push($V([x,y,brightness]))
})
var axis1 = $L($V([1,0,0]), $V([0,1,0]))
var axis2 = $L($V([0,1,0]), $V([1,0,0]))
var axis3 = $L($V([0,0,0]), $V([0,1,1]))
var axis4 = $L($V([0,1,0]), $V([0,1,1]))
// vectors = vectors.map(v => v.rotate(Math.PI*1.5, axis1))
drawVectors()
setTimeout(() => {
d3.timer(() => {
vectors = vectors.map(v => v.rotate(Math.PI*0.01, axis1))
drawVectors()
})
}, 1000)
function drawVectors() {
blankImageData(dataOut)
vectors.forEach(v => {
var x = v.elements[0],
y = v.elements[1],
brightness = v.elements[2] / dataIn.width * 255,
offset = Math.round(y * dataOut.width + x) * 4;
dataOut.data[offset] = brightness
dataOut.data[offset + 1] = 0 //brightness*Math.sin(Date.now()/1000)*0
dataOut.data[offset + 2] = -brightness
})
ctx.putImageData(dataOut,0,0);
}
}
function blankImageData(data) {
for (x=0;x<data.width;x++) {
for (y=0;y<data.width;y++) {
var offset=(y*data.width + x)*4;
data.data[offset] =0;
data.data[offset+1]=0;
data.data[offset+2]=0;
data.data[offset+3]=255;
}
}
return data
}
// unused from https://www.productchart.com/blog/2017-12-19-images
// weirdly, i haven't quite recreated it, i think my scaling/fuzzing's a bit off
// "if (rest>Math.random()) ix++;" is a sorta weird clever trick
// for (x=0;x<canvas.width;x++) {
// for (y=0;y<canvas.height;y++) {
// var offset=(y*dataOut.width + x)*4;
// r=dataIn.data[offset]/256/3;
// g=dataIn.data[offset+1]/256/3;
// b=dataIn.data[offset+2]/256/3;
// var rx=(r+g+b)*canvas.width;
// var ix=Math.floor(rx);
// rest=rx-ix;
// if (rest>Math.random()) ix++;
// var offset=(y*dataOut.width + ix)*4;
// var col=Math.round(x/canvas.width*256);
// col=(dataOut.data[offset]+col)/2;
//
// dataOut.data[offset]=col;
// dataOut.data[offset+1]=col;
// dataOut.data[offset+2]=col;
// }
// }
//
// ctx.putImageData(dataOut,0,0);
body {
background: black;
}
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v.u([A[0]+D[0]*b,A[1]+D[1]*b,A[2]+D[2]*b])}1d o(a.W){9 c=7.W.2f(a.W).2q();9 N=7.W.4,A=7.K.4,O=a.W.4,B=a.K.4;9 d=S.1j(2,2),i=0;H(d.2y()){i++;d=S.u([[N[i%3],N[(i+1)%3]],[O[i%3],O[(i+1)%3]]])}9 e=d.2w().4;9 x=N[0]*A[0]+N[1]*A[1]+N[2]*A[2];9 y=O[0]*B[0]+O[1]*B[1]+O[2]*B[2];9 f=[e[0][0]*x+e[0][1]*y,e[1][0]*x+e[1][1]*y];9 g=[];2e(9 j=1;j<=3;j++){g.19((i==j)?0:f[(j+(5-i)%3)%3])}8 14.u(g,c)}},1r:l(a){9 P=a.4||a;9 A=7.K.4,N=7.W.4;9 b=(A[0]-P[0])*N[0]+(A[1]-P[1])*N[1]+(A[2]-(P[2]||0))*N[2];8 v.u([P[0]+N[0]*b,P[1]+N[1]*b,(P[2]||0)+N[2]*b])},1V:l(t,a){9 R=S.1R(t,a.U).4;9 C=a.1r(7.K).4;9 A=7.K.4,N=7.W.4;9 b=C[0],1E=C[1],1J=C[2],1w=A[0],18=A[1],1a=A[2];9 x=1w-b,y=18-1E,z=1a-1J;8 11.u([b+R[0][0]*x+R[0][1]*y+R[0][2]*z,1E+R[1][0]*x+R[1][1]*y+R[1][2]*z,1J+R[2][0]*x+R[2][1]*y+R[2][2]*z],[R[0][0]*N[0]+R[0][1]*N[1]+R[0][2]*N[2],R[1][0]*N[0]+R[1][1]*N[1]+R[1][2]*N[2],R[2][0]*N[0]+R[2][1]*N[1]+R[2][2]*N[2]])},1t:l(a){o(a.W){9 A=7.K.4,N=7.W.4;9 b=A[0],18=A[1],1a=A[2],2M=N[0],2L=N[1],2Q=N[2];9 c=7.K.1t(a).4;9 d=b+2M,2p=18+2L,2m=1a+2Q;9 Q=a.1r([d,2p,2m]).4;9 e=[Q[0]+(Q[0]-d)-c[0],Q[1]+(Q[1]-2p)-c[1],Q[2]+(Q[2]-2m)-c[2]];8 11.u(c,e)}1d o(a.U){8 7.1V(F.1A,a)}1d{9 P=a.4||a;8 11.u(7.K.1t([P[0],P[1],(P[2]||0)]),7.W)}},1Z:l(a,b,c){a=v.u(a);a=a.1N();o(a===w){8 w}b=v.u(b);b=b.1N();o(b===w){8 w}o(1g(c)==\'1f\'){c=w}1d{c=v.u(c);c=c.1N();o(c===w){8 w}}9 d=a.4[0],18=a.4[1],1a=a.4[2];9 e=b.4[0],1W=b.4[1],1X=b.4[2];9 f,1i;o(c!==w){9 g=c.4[0],2l=c.4[1],2t=c.4[2];f=v.u([(1W-18)*(2t-1a)-(1X-1a)*(2l-18),(1X-1a)*(g-d)-(e-d)*(2t-1a),(e-d)*(2l-18)-(1W-18)*(g-d)]);1i=f.1u();o(1i===0){8 w}f=v.u([f.4[0]/1i,f.4[1]/1i,f.4[2]/1i])}1d{1i=F.1x(e*e+1W*1W+1X*1X);o(1i===0){8 w}f=v.u([b.4[0]/1i,b.4[1]/1i,b.4[2]/1i])}7.K=a;7.W=f;8 7}};11.u=l(a,b,c){9 P=25 11();8 P.1Z(a,b,c)};11.2I=11.u(v.1j(3),v.k);11.2H=11.u(v.1j(3),v.i);11.2G=11.u(v.1j(3),v.j);11.36=11.2I;11.35=11.2H;11.3j=11.2G;9 $V=v.u;9 $M=S.u;9 $L=14.u;9 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