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fractal1.js
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fractal1.js
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var FractalConfig = function() {
this.iterations = 3;
this.petals = 6;
this.innerCircle = true;
this.innerFlower = true;
this.colorize = false;
this.grabImage = function() {
var dataURL = document.getElementById("fractalCanvas").toDataURL('image/png');
window.open(dataURL, '_blank');
};
};
var fcg = new FractalConfig();
var c = document.getElementById("fractalCanvas");
var ctx = c.getContext("2d");
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;
var width = ctx.canvas.width;
var height = ctx.canvas.height;
var winSize = Math.min(width, height);
var size = winSize * 0.25 * 0.8;
function redraw() {
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;
width = ctx.canvas.width;
height = ctx.canvas.height;
winSize = Math.min(width, height);
size = winSize * 0.25 * 0.8;
var t0 = performance.now();
clearCanvas();
drawFlowerOfLife(width * 0.5, height * 0.5, size, fcg.iterations);
var t1 = performance.now();
console.log("Redraw done in " + (t1 - t0) + " milliseconds.");
};
window.addEventListener('resize', redraw, false);
window.onload = function() {
var gui = new dat.GUI();
gui.add(fcg, 'iterations', 1, 8).step(1).onChange(redraw);
gui.add(fcg, 'petals', 1, 20).step(1).onChange(redraw);
gui.add(fcg, 'innerCircle').onChange(redraw);
gui.add(fcg, 'innerFlower').onChange(redraw);
gui.add(fcg, 'colorize').onChange(redraw);
gui.add(fcg, 'grabImage');
redraw();
};
function clearCanvas() {
ctx.fillStyle = "black";
ctx.fillRect(0, 0, width, height);
}
function drawFlowerOfLife(x, y, rad, level) {
if (level == 0) return;
var d = level / fcg.iterations;
ctx.strokeStyle = '#fff';
if (fcg.colorize) {
var r = 255 * (d * 2 - 1.0);
var g = 255 * (1.0 - (d));
var b = 255 * (d * 2);
var a = 1.0;
ctx.strokeStyle = 'rgba(' + r + ', ' + g + ', ' + b + ', ' + a + ')';
}
else {
var a = d;
ctx.strokeStyle = 'rgba(255, 255, 255, ' + a + ')';
}
ctx.lineWidth = Math.pow(d, 0.2);
if (fcg.innerCircle) {
ctx.beginPath();
ctx.arc(x, y, rad, 0, 2 * Math.PI);
ctx.stroke();
}
var points = [];
for (var i = 0; i < fcg.petals; i++) {
var angle = (Math.PI * 2) / fcg.petals * i;
var nx = x + rad * Math.sin(angle);
var ny = y + rad * Math.cos(angle);
points.push({'x': nx, 'y': ny});
}
for (var pi in points) {
var p = points[pi];
ctx.beginPath();
ctx.arc(p.x, p.y, rad, 0, 2 * Math.PI);
ctx.stroke();
}
if (fcg.innerFlower) {
drawFlowerOfLife(x, y, rad * 0.5, level - 1);
}
for (var pi in points) {
var p = points[pi];
drawFlowerOfLife(p.x, p.y, rad * 0.5, level - 1);
}
}