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2D Color Interpolation
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| <!DOCTYPE html> | |
| <meta charset='utf-8'> | |
| <body> | |
| <script src='http://d3js.org/d3.v3.min.js'></script> | |
| <script> | |
| var size = 12; | |
| var step = 40; | |
| var X = d3.scale.linear() | |
| .domain([0, size]) | |
| .range(['white', 'steelblue']); | |
| var Y = d3.scale.linear() | |
| .domain([0, size]) | |
| .range(['white', 'brown']); | |
| var canvas = d3.select('body').append('canvas') | |
| .attr('width', size*step) | |
| .attr('height', size*step) | |
| .node(); | |
| var context = canvas.getContext('2d'); | |
| d3.range(0,size).forEach(function(y) { | |
| d3.range(0,size).forEach(function(x) { | |
| var color = d3.scale.linear() | |
| .domain([-1,1]) | |
| .range([X(x), Y(y)]) | |
| .interpolate(d3.interpolateLab); | |
| var strength = (y - x) / (size-1); | |
| circle(x,y,color(strength)); | |
| }); | |
| }); | |
| function circle(x,y,color) { | |
| context.fillStyle = color; | |
| context.beginPath(); | |
| context.arc((x+1/2)*step,(y+1/2)*step,2*step/5,0,2*Math.PI); | |
| context.fill(); | |
| }; | |
| </script> |
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