forked from vigorousnorth's block: Labelled graticules
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October 2, 2016 12:02
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Labelled graticules (d3v4) [UNLISTED]
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license: mit |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<!-- A refinement of http://bl.ocks.org/mbostock/3664049 with labeled graticules --> | |
<style> | |
.graticule { | |
fill: none; | |
stroke: #000; | |
} | |
.graticule.outline { | |
stroke-width: 2px; | |
} | |
.label { | |
font: 300 9px "Helvetica Neue", Helvetica, Arial, sans-serif; | |
text-anchor: end; | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v4.min.js"></script> | |
<script src="http://d3js.org/d3-geo-projection.v1.min.js"></script> | |
<script> | |
var width = 960, | |
height = 480; | |
var projection = d3.geoWinkel3() | |
.scale(145) | |
.translate([width / 2, height / 2]) | |
.precision(.1); | |
var path = d3.geoPath() | |
.projection(projection); | |
var graticule = d3.geoGraticule(); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
svg.selectAll("path") | |
.data(graticule.lines()) | |
.enter().append("path") | |
.attr("class", "graticule line") | |
.attr("id", function(d) { | |
var c = d.coordinates; | |
if (c[0][0] == c[1][0]) { | |
return (c[0][0] < 0) ? -c[0][0] + "W" : +c[0][0] + "E"; | |
} | |
else if (c[0][1] == c[1][1]) { | |
return (c[0][1] < 0) ? -c[0][1] + "S" : c[0][1] + "N"; | |
} | |
}) | |
.attr("d", path); | |
svg.selectAll('text') | |
.data(graticule.lines()) | |
.enter().append("text") | |
.text(function(d) { | |
var c = d.coordinates; | |
if ((c[0][0] == c[1][0]) && (c[0][0] % 30 == 0)) {return (c[0][0]);} | |
else if (c[0][1] == c[1][1]) {return (c[0][1]);} | |
}) | |
.attr("class","label") | |
.attr("style", function(d) { | |
var c = d.coordinates; | |
return (c[0][1] == c[1][1]) ? "text-anchor: end" : "text-anchor: middle"; | |
}) | |
.attr("dx", function(d) { | |
var c = d.coordinates; | |
return (c[0][1] == c[1][1]) ? -10 : 0; | |
}) | |
.attr("dy", function(d) { | |
var c = d.coordinates; | |
return (c[0][1] == c[1][1]) ? 4 : 10; | |
}) | |
.attr('transform', function(d) { | |
var c = d.coordinates; | |
return ('translate(' + projection(c[0]) + ')') | |
}); | |
svg.append("path") | |
.datum(graticule.outline) | |
.attr("class", "graticule outline") | |
.attr("d", path); | |
</script> |
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