A simple example drawing a great arc as a LineString. The projection is rotated to avoid interrupting the arc. See also an earlier example with multiple great arcs.
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August 17, 2017 13:54
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Great Arc
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.graticule { | |
fill: none; | |
stroke: #777; | |
stroke-width: .5px; | |
stroke-opacity: .5; | |
} | |
.land { | |
fill: #bbb; | |
} | |
.arc { | |
fill: none; | |
stroke: red; | |
stroke-width: 3px; | |
stroke-linecap: round; | |
} | |
.boundary { | |
fill: none; | |
stroke: #fff; | |
stroke-width: .5px; | |
stroke-linejoin: round; | |
stroke-linecap: round; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script src="//d3js.org/topojson.v1.min.js"></script> | |
<script> | |
var width = 960, | |
height = 480; | |
var projection = d3.geo.equirectangular() | |
.scale(153) | |
.rotate([160, 0]) | |
.translate([width / 2, height / 2]) | |
.precision(.1); | |
var path = d3.geo.path() | |
.projection(projection); | |
var graticule = d3.geo.graticule(); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
svg.append("path") | |
.datum(graticule) | |
.attr("class", "graticule") | |
.attr("d", path); | |
svg.append("path") | |
.datum({type: "LineString", coordinates: [[-77.05, 38.91], [116.35, 39.91]]}) | |
.attr("class", "arc") | |
.attr("d", path); | |
d3.json("/mbostock/raw/4090846/world-50m.json", function(error, world) { | |
if (error) throw error; | |
svg.insert("path", ".graticule") | |
.datum(topojson.feature(world, world.objects.land)) | |
.attr("class", "land") | |
.attr("d", path); | |
svg.insert("path", ".graticule") | |
.datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
.attr("class", "boundary") | |
.attr("d", path); | |
}); | |
d3.select(self.frameElement).style("height", height + "px"); | |
</script> |
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Thanks for the nice example. I am new to d3 and the map projections.
Is there any example to draw an uninterrupted great arc without rotating the equirectangular projection?