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Fan Flower Power
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| height: 960 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| background: #222; | |
| margin: auto; | |
| width: 960px; | |
| } | |
| </style> | |
| <canvas width="960" height="960"></canvas> | |
| <script src="//d3js.org/d3.v4.0.0-alpha.21.min.js"></script> | |
| <script> | |
| var canvas = d3.select("canvas"), | |
| width = +canvas.attr("width"), | |
| height = +canvas.attr("height"), | |
| ctx = canvas.node().getContext("2d"); | |
| var point = [width / 2, height / 2]; | |
| var lastMouse = [width / 2, height / 2] | |
| var space = 20; | |
| var dx, dy, dist; | |
| var color; | |
| var colorX = d3.scaleLinear().domain([0, width]).range([0, 360]); | |
| var colorY = d3.scaleLinear().domain([0, height]).range([0, 1]); | |
| var rot = d3.scaleLinear().domain([Math.PI, -Math.PI]).range([0, 360]); | |
| var thickness = d3.scaleLinear(19).domain([0, Math.sqrt(width*width + height*height)]).range([20, 2]); | |
| var satScales = [ | |
| d3.scaleLinear().domain([0, Math.max(width / 2, height / 2)]).range([1.0, 2.0]), | |
| d3.scaleLinear().domain([0, Math.max(width / 2, height / 2)]).range([50, 0]), | |
| ]; | |
| var last = [0.5, 0.9]; | |
| var methods = [d3.cubehelix, d3.hsl]; | |
| var i = 1; | |
| var rotated = 0; | |
| function draw() { | |
| ctx.clearRect(0, 0, width, height); | |
| for (var x = 0; x < width; x += space) { | |
| for (var y = 0; y < height; y += space) { | |
| dx = x - point[0]; | |
| dy = y - point[1]; | |
| theta = Math.atan2(dy, dx); | |
| dist = Math.sqrt(dx*dx + dy*dy); | |
| ctx.beginPath(); | |
| ctx.moveTo(x, y); | |
| ctx.lineTo(x + Math.cos(theta)*20, y + Math.sin(theta) * 20); | |
| ctx.strokeStyle = methods[i](rot(rotated + theta), satScales[i](dist), last[i]).toString(); | |
| ctx.lineWidth = thickness(dist); | |
| ctx.stroke(); | |
| } | |
| } | |
| } | |
| draw(); | |
| function update() { | |
| rotated -= 0.02; | |
| draw(); | |
| requestAnimationFrame(update); | |
| }; | |
| requestAnimationFrame(update); | |
| canvas.on("mousemove", function() { | |
| point = d3.mouse(canvas.node()); | |
| var movedX = point[0] - lastMouse[0]; | |
| var movedY = point[1] - lastMouse[1]; | |
| var moved = Math.sqrt(movedX*movedX + movedY*movedY); | |
| rotated += moved / 100; | |
| lastMouse = point; | |
| }); | |
| canvas.on("mousedown", function() { | |
| i = (i + 1) % 2; | |
| console.log(i); | |
| }); | |
| </script> |
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