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| <html> | |
| <head> | |
| <title>Sketch1</title> | |
| <style> | |
| body { | |
| margin: 0; | |
| background-color: #000; | |
| } | |
| line { | |
| stroke: #333; | |
| stroke-width: 4; | |
| stroke-linecap: round; | |
| } | |
| </style> | |
| <script src="http://coffeescript.org/extras/coffee-script.js"></script> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script type="text/coffeescript" src="main.coffee"></script> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
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| body = d3.select 'body' | |
| WIDTH = parseInt body.style('width'), 10 | |
| HEIGHT = parseInt body.style('height'), 10 | |
| REACH = 200 | |
| DENSITY = 1 / 500 | |
| distance = (p1, p2) -> Math.sqrt Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2) | |
| zip = (lists...) -> | |
| result = [] | |
| for _, i in lists[0] | |
| item = [] | |
| for list in lists | |
| item.push list[i] | |
| result.push item | |
| return result | |
| Point = (pair) -> x: pair[0], y: pair[1] | |
| Line = (p1, p2) -> p1: p1, p2: p2, length: (distance p1, p2) | |
| svg = body.append 'svg' | |
| .style | |
| width: WIDTH | |
| height: HEIGHT | |
| color = d3.scale.linear() | |
| .domain [0, REACH] | |
| .range ['#f00', '#ff0'] | |
| opacity = d3.scale.sqrt() | |
| .domain [0, REACH] | |
| .range [1, 0] | |
| numPoints = WIDTH * HEIGHT * DENSITY | |
| xs = (Math.floor(Math.random() * WIDTH) for x in [0..numPoints]) | |
| ys = (Math.floor(Math.random() * HEIGHT) for x in [0..numPoints]) | |
| points = zip(xs, ys).map Point | |
| update = () -> | |
| mouse = Point d3.mouse @ | |
| candidates = points.map (p) -> Line p, mouse | |
| data = candidates.reduce (memo, line) -> | |
| if line.length <= REACH then memo.push(line) | |
| return memo | |
| , [] | |
| lines = svg.selectAll 'line' | |
| .data data, (d) -> "#{ d.p1.x },#{ d.p1.y }" | |
| lines.enter().append 'line' | |
| lines.exit().remove() | |
| lines | |
| .attr | |
| x1: (d) -> d.p1.x | |
| y1: (d) -> d.p1.y | |
| x2: (d) -> d.p2.x | |
| y2: (d) -> d.p2.y | |
| .style | |
| 'stroke-opacity': (d) -> opacity d.length | |
| 'stroke': (d) -> color d.length | |
| .sort (a, b) -> a.length - b.length | |
| svg.on 'mousemove', update |
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