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guilloche.js
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guilloche.js
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var Guilloche = (function(){
var width = (window.innerWidth||document.documentElement.clientWidth);
var height = (window.innerHeight||document.documentElement.clientHeight);
var _step = 0.0001;
var _zoom = 5;
var _color = function(theta,step){
var c = Math.round(theta*(1/step))%255;
return {
r:c,
g:c,
b:c,
a:255
};
}
//------------------------------------------------------
//A rosette!
var rosette = function(image,R,r,p,step,zoom,color) {
step = step || _step;
zoom = zoom || _zoom;
color = color || _color;
var cx = image.width>>1;
var cy = image.height>>1;
var rr = R+r;
var rp = r+p;
var rrr = (R+r)/r;
for(var theta=0,x=0,y=0;theta<Math.tau;theta+=step) {
x = Math.round(((rr*Math.cos(theta)) + (rp*Math.cos(rrr*theta))) * zoom) + cx;
y = Math.round(((rr*Math.sin(theta)) - (rp*Math.sin(rrr*theta))) * zoom) + cy;
image.put(x,y,color(theta,step));
}
return image;
}
//------------------------------------------------------
//A cylinder!
var cylinder = function(image,R,r,p,step,zoom,color) {
step = step || _step;
zoom = zoom || _zoom;
color = color || _color;
var cx = image.width>>1;
var cy = image.height>>1;
var rr = R+r;
var rp = r+p;
var rrr = (R+r)/r;
for(var theta=0,x=0,y=0;theta<Math.tau;theta+=step) {
x = Math.round(((rr*Math.cos(theta)) + (rp*Math.sin(rrr*theta))) * zoom) + cx;
y = Math.round(((rr*Math.sin(theta)) - (rp*Math.sin(rrr*theta))) * zoom) + cy;
image.put(x,y,color(theta,step));
}
return image;
}
//------------------------------------------------------
//A ribbon!
var ribbon = function(image,R,r,p,step,zoom,color) {
step = step || _step;
zoom = zoom || _zoom;
color = color || _color;
var cx = image.width>>1;
var cy = image.height>>1;
var rr = R+r;
var rp = r+p;
var rrr = (R+r)/r;
for(var theta=0,x=0,y=0;theta<Math.tau;theta+=step) {
x = Math.round(((rr*Math.tan(theta)) + (rp*Math.tan(rrr*theta))) * zoom) + cx;
y = Math.round(((rr*Math.sin(theta)) - (rp*Math.cos(rrr*theta))) * zoom) + cy;
image.put(x,y,color(theta,step));
}
return image;
}
//------------------------------------------------------
//A river!
var river = function(image,R,r,p,step,zoom,color) {
step = step || _step;
zoom = zoom || _zoom;
color = color || _color;
var cx = image.width>>1;
var cy = image.height>>1;
var rr = R+r;
var rp = r+p;
var rrr = (R+r)/r;
for(var theta=0,x=0,y=0;theta<Math.tau;theta+=step) {
x = Math.round(((rr*Math.tan(theta)) + (rp*Math.tan(rrr*theta))) * zoom) + cx;
y = Math.round(((rr*Math.sin(theta)) - (rp*Math.sin(rrr*theta))) * zoom) + cy;
image.put(x,y,color(theta,step));
}
return image;
}
//------------------------------------------------------
//A cross!
var cross = function(image,R,r,p,step,zoom,color) {
step = step || _step;
zoom = zoom || _zoom;
color = color || _color;
var cx = image.width>>1;
var cy = image.height>>1;
var rr = R+r;
var rp = r+p;
var rrr = (R+r)/r;
for(var theta=0,x=0,y=0;theta<Math.tau;theta+=step) {
x = Math.round(((rr*Math.sin(theta)) + (rp*Math.tan(rrr*theta))) * zoom) + cx;
y = Math.round(((rr*Math.tan(theta)) - (rp*Math.sin(rrr*theta))) * zoom) + cy;
image.put(x,y,color(theta,step));
}
return image;
}
//------------------------------------------------------
//A knee!
var knee = function(image,R,r,p,step,zoom,color) {
step = step || _step;
zoom = zoom || _zoom;
color = color || _color;
var cx = image.width>>1;
var cy = image.height>>1;
var rr = R+r;
var rp = r+p;
var rrr = (R+r)/r;
for(var theta=0,x=0,y=0;theta<Math.tau;theta+=step) {
x = Math.round(((rr*Math.cos(theta)) + (rp*Math.cos(rrr*theta))) * zoom) + cx;
y = Math.round(((rr*Math.sin(theta)) - (rp*Math.tan(rrr*theta))) * zoom) + cy;
image.put(x,y,color(theta,step));
}
return image;
}
//------------------------------------------------------
//A test!
var test = function(image,R,r,p,step,zoom,color) {
step = step || _step;
zoom = zoom || _zoom;
color = color || _color;
var cx = image.width>>1;
var cy = image.height>>1;
var rr = R+r;
var rp = r+p;
var rrr = (R+r)/r;
for(var theta=0,x=0,y=0;theta<Math.tau;theta+=step) {
x = Math.round(((rr*rr*Math.tan(theta)) + (rp*Math.cos(rrr*theta))) * zoom) + cx;
y = Math.round(((rr*Math.sin(theta)) - (rp*Math.sin(rrr*theta))) * zoom) + cy;
image.put(x,y,color(theta,step));
}
return image;
}
//------------------------------------------------------
return {
width:width,
height:height,
cylinder:cylinder,
rosette:rosette,
ribbon:ribbon,
river:river,
cross:cross,
knee:knee,
test:test
}
})();