The NASA Blue Marble is reprojected using d3.geo.kavrayskiy7
’s invert
function.
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
background: #222; | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script src="http://d3js.org/d3.geo.projection.v0.min.js"></script> | |
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script> | |
<script> | |
var current_earth; | |
$.ajax({ | |
url : "http://dl.dropbox.com/u/11379868/setupwallpaper", | |
success : function(result){ | |
console.log(result); | |
current_earth = result; | |
} | |
}); | |
var width = 960, | |
height = 500; | |
var projection = d3.geo.kavrayskiy7(); | |
var path = d3.geo.path() | |
.projection(projection); | |
var canvas = d3.select("body").append("canvas") | |
.attr("width", width) | |
.attr("height", height); | |
var context = canvas.node().getContext("2d"); | |
var image = new Image; | |
image.onload = onload; | |
image.src = "readme-blue-marble.jpg"; | |
function onload() { | |
var dx = image.width, | |
dy = image.height; | |
context.drawImage(image, 0, 0, dx, dy); | |
var sourceData = context.getImageData(0, 0, dx, dy).data, | |
target = context.createImageData(width, height), | |
targetData = target.data; | |
for (var y = 0, i = -1; y < height; ++y) { | |
for (var x = 0; x < width; ++x) { | |
var p = projection.invert([x, y]), λ = p[0], φ = p[1]; | |
if (λ > 180 || λ < -180 || φ > 90 || φ < -90) { i += 4; continue; } | |
var q = ((90 - φ) / 180 * dy | 0) * dx + ((180 + λ) / 360 * dx | 0) << 2; | |
targetData[++i] = sourceData[q]; | |
targetData[++i] = sourceData[++q]; | |
targetData[++i] = sourceData[++q]; | |
targetData[++i] = 255; | |
} | |
} | |
context.clearRect(0, 0, width, height); | |
context.putImageData(target, 0, 0); | |
} | |
</script> |
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