Just testing d3.image.
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d3.image test
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <!-- script src="/d3.js"></script --> | |
| <script src="https://raw.githubusercontent.com/ge045/d3/feature/d3_image/d3.js"></script> | |
| <script> | |
| var width = 960, height = 500, fname = "readme.png"; | |
| //var width = 48, height = 64, fname = "small.jpg"; | |
| //var width = 480, height = 250, fname = "readme_xs.png"; | |
| var color = d3.scale.linear() | |
| .domain([15, 35, 132]) | |
| .range(["#d7191c", "#ffffbf", "#2c7bb6"]) | |
| .interpolate(d3.interpolateHcl); | |
| var canvas = d3.select("body").append("canvas") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var context = canvas.node().getContext("2d"); | |
| var colorize = function(image) | |
| { | |
| return function(){ | |
| context.drawImage(image, 0, 0, width, height); | |
| var imageData = context.getImageData(0, 0, width, height); | |
| // Rescale the colors. | |
| for (var c, i = 0, n = width * height * 4, d = imageData.data; i < n; i += 4) { | |
| c = d3.rgb(color(d[i])); | |
| d[i + 0] = c.r; | |
| d[i + 1] = c.g; | |
| d[i + 2] = c.b; | |
| } | |
| context.putImageData(imageData, 0, 0); | |
| }; | |
| } | |
| d3.image(fname, function(error, image) { | |
| if (error!==null) return console.log(error); | |
| canvas.attr("src", image.src) | |
| image.onload = colorize(image); | |
| } | |
| ); | |
| </script> |
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