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<html> |
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<head> |
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<style> |
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label { |
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position: absolute; |
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top: 15px; |
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right: 15px; |
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font-family: sans-serif; |
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font-size: 12px; |
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} |
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.state-interior { |
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fill: #fff; |
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} |
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.state-border { |
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fill: none; |
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stroke: lightslategrey; |
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} |
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.raster { |
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pointer-events: none; |
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fill: none; |
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} |
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.charcoalified .state-interior { |
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fill: #000; |
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} |
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.charcoalified .state-border { |
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stroke: none; |
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} |
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</style> |
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</head> |
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<body> |
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<label> |
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<input type="checkbox"> |
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Charcoalify |
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</label> |
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<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script> |
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<script src="//d3js.org/topojson.v1.min.js"></script> |
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<script> |
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var width = 960, |
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height = 1000; |
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// Path generator that works with preprojected geo data |
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// (see http://bl.ocks.org/mbostock/5663666) |
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var path = d3.geo.path() |
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.projection(matrix(1, 0, 0, -1, 0, height)) |
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var svg = d3.select("body").append("svg") |
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.attr("width", width) |
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.attr("height", height); |
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d3.json("wi.json", function(error, wi) { |
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if (error) throw error; |
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var counties = topojson.feature(wi, wi.objects.counties), |
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state = topojson.merge(wi, wi.objects.counties.geometries); |
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// Fit the geography to the canvas (i.e., scale and translate) |
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var b = path.bounds(counties), |
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s = .975 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height), |
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t = [(width - s * (b[1][0] + b[0][0])) / 2, (height - s * (b[1][1] + b[0][1])) / 2]; |
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path.projection(matrix(s, 0, 0, -s, t[0], t[1])); |
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// Draw state interior |
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svg.append("path").datum(state) |
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.attr("class", "state-interior") |
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.attr("d", path); |
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// Draw shaded relief from raster data |
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var raster_width = (b[1][0] - b[0][0]) * s; |
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var raster_height = (b[1][1] - b[0][1]) * s; |
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var rtranslate_x = (width - raster_width) / 2; |
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var rtranslate_y = (height - raster_height) / 2; |
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svg.append("image") |
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.attr("xlink:href", "shaded-relief.png") |
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.attr("class", "raster") |
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.attr("width", raster_width) |
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.attr("height", raster_height) |
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.attr("transform", |
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"translate(" + rtranslate_x + ", " + rtranslate_y + ")"); |
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// Draw state border from vector data |
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// (drawn after raster so it overlays) |
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svg.append("path").datum(state) |
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.attr("class", "state-border") |
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.attr("d", path); |
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// TODO: The raster data and vector data don't match up perfectly here |
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// This may be due to the fact that this state border is from merged |
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// county data and the raster image was clipped to a state border from |
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// a different vector file. May also be due to the projection issues. |
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}); |
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// Charcoalify checkbox |
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var charcoalified = false; |
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d3.select("input") |
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.on("change", function() { |
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svg.classed("charcoalified", charcoalified = !charcoalified); |
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}); |
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function matrix(a, b, c, d, tx, ty) { |
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return d3.geo.transform({ |
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point: function(x, y) { this.stream.point(a * x + b * y + tx, c * x + d * y + ty); } |
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}); |
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} |
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</script> |
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</body> |
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</html> |
