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circle_packing.js
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circle_packing.js
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var isNode = (typeof module !== 'undefined');
var circle_packing = function() {
var sw = 1200, sh = 1200;
var cx = 0.5, cy = 0.5;
var bmp = dom.canvas(sw, sh);
var experiment = {
stage: bmp.canvas,
init: init,
settings: {} // or null
}
function drawLine(p0, p1, colour, lineWidth) {
bmp.ctx.strokeStyle = colour;
bmp.ctx.lineWidth = lineWidth;
bmp.ctx.beginPath();
bmp.ctx.moveTo(p0.x, p0.y);
bmp.ctx.lineTo(p1.x, p1.y);
bmp.ctx.stroke();
}
var output = dom.element("div");
document.body.appendChild(output);
function init() {
// rand.setSeed(4);
bmp.ctx.clearRect(0, 0, sw, sh);
var iterations = 0;
var circles = 0;
var threads = 0;
function attemptNextCircle(parent, attempt) {
attempt++;
// con.log("attemptNextCircle", attempt);
output.innerHTML = [circles, attempt, threads];
if (attempt < 1250) {
setTimeout(function() {
drawCircle(parent, attempt);
}, 1);
}
}
function drawCircle(parent, attempt) {
threads++;
var gap = 0.001;
var x, y, r, dx, dy, d, depth, colour, angle, distance, other;
if (parent){
angle = rand.random() * Math.PI * 2;
// distance from centre of parent
distance = rand.random() * parent.r;
// banding
// distance = rand.getInteger(1, 5) / 5 * parent.r + rand.random() * 0.03;
x = parent.x + Math.sin(angle) * distance;
y = parent.y + Math.cos(angle) * distance;
dx = x - cx;
dy = y - cy;
d = Math.sqrt(dx * dx + dy * dy);
// maxRadius = Math.pow(0.6 - d, 3) * 4;
maxRadius = (0.7 - d) * 0.2;
// maxRadius = (d + 0.1) * 0.2;
// maxRadius = 0.07;
// maxRadius = (Math.sin((0.25 + d) * Math.PI * 2 * 2.5) + 1.5) / 80;
// maxRadius = (Math.sin((d) * Math.PI * 2 * 2.5) + 1.3) / 70;
if (maxRadius > 1 ) con.log(maxRadius);
// r = maxRadius;
r = 0.005;// rand.random() * maxRadius * (parent.r - distance - gap);
// r = parent.r - distance - gap;
if (r < 0.005) {
threads--;
attemptNextCircle(parent, attempt);
return;
}
depth = parent.depth + 1;
var ok = true;
for (var i = 0, il = parent.children.length; i < il && ok; i++) {
other = parent.children[i];
dx = x - other.x;
dy = y - other.y;
d = Math.sqrt(dx * dx + dy * dy); // minimum required distance between centres
var dR = r + other.r + gap; // actual distance
// drawLine({x: other.x * sw, y: other.y * sw}, {x:x*sw, y:y*sw}, "red", 2);
if (dR > d) {
ok = false;
}
}
if (ok === false) {
threads--;
attemptNextCircle(parent, attempt);
return;
} else {
// colour = depth % 2 == 0 ? "rgba(0, 0, 255, 0.5)" : "rgba(0, 255, 0, 0.5)";
// colour = depth % 2 == 0 ? "black" : "white";
colour = colours.getNextColour();
}
} else {
x = cx;//rand.random();
y = cy;//rand.random();
r = 0.45;//rand.random() / 2;
colour = "rgba(0, 0, 0, 0)";
depth = 0;
}
bmp.ctx.beginPath();
bmp.ctx.fillStyle = colour;
bmp.ctx.drawCircle(x * sw, y * sh, r * sw);
bmp.ctx.closePath();
bmp.ctx.fill();
// con.log('drawOne', x, y, colour);
// con.log("iterations", iterations, x, y, r, bmp.ctx.fillStyle, depth, depth % 2);
iterations++;
var circle = {
depth: depth,
x: x,
y: y,
r: r,
children: []
}
circles++;
if (parent && parent.children) {
parent.children.push(circle);
}
// if (iterations < 4) {//500) {
if (depth < 1) {
var num = 500;//rand.random() * 6;
for (var i = 0; i < num; i++) {
attemptNextCircle(circle, 0);
}
}
if (parent) {
attemptNextCircle(parent, attempt);
}
threads--;
return circle;
}
var parent = drawCircle(0, 0);
// drawCircle(parent, 0);
progress("render:complete", bmp.canvas);
}
return experiment;
};
if (isNode) {
module.exports = circle_packing();
} else {
define("circle_packing", circle_packing);
}