Created
September 9, 2013 06:19
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Polar hyperbolic grid
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| <!DOCTYPE HTML> | |
| <head> | |
| <script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| //Setup canvas | |
| var canvas = document.createElement("canvas"); | |
| document.body.appendChild(canvas); | |
| canvas.width = 1000; | |
| canvas.height = 600; | |
| var xgrid = 10, | |
| ygrid = 10, | |
| k = 100; | |
| var screen = canvas.getContext("2d"); | |
| screen.translate(canvas.width/2, canvas.height/2); | |
| d3.select("canvas").on("mousemove", draw); | |
| function hyper(p) { | |
| //transform to radial hyperbolic | |
| var r = Math.sqrt(p[0]*p[0] + p[1]*p[1]), | |
| x1 = p[0] / (r + k), | |
| y1 = p[1] / (r + k); | |
| return [x1, y1]; | |
| } | |
| function draw() { | |
| screen.fillStyle = "rgba(255,255,255,1)"; | |
| screen.fillRect(-canvas.width/2,-canvas.height/2,canvas.width,canvas.height); | |
| screen.fillStyle = "rgb(0,0,0)"; | |
| var mouse = d3.mouse(this); | |
| var i = canvas.width; | |
| while (i -= xgrid) { | |
| var j = canvas.height; | |
| while (j -= ygrid) { | |
| var p = hyper([i-mouse[0],j-mouse[1]]); | |
| screen.fillRect(p[0]*canvas.width*.5, p[1]*canvas.height*.5, 1, 1); | |
| } | |
| } | |
| } | |
| </script> |
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