Built with blockbuilder.org
-
-
Save Fil/d739666af1acdb0ead32a59967aeb461 to your computer and use it in GitHub Desktop.
Poor man's Composite projection
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
license: mit |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<!DOCTYPE html> | |
<head> | |
<meta charset="utf-8"> | |
<script src="https://d3js.org/d3.v4.js"></script> | |
<script src="https://d3js.org/topojson.v2.min.js"></script> | |
<style> | |
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
path { fill: none; stroke: black; } | |
#land { fill: black } | |
#sphere { stroke-width: 2; fill: lightblue; } | |
#invert { fill: red} | |
</style> | |
</head> | |
<body> | |
<script> | |
// Feel free to change or delete any of the code you see in this editor! | |
var svg = d3.select("body").append("svg") | |
.attr("width", 960) | |
.attr("height", 500) | |
var projections = [ | |
d3.geoOrthographic() | |
.clipExtent([[0,0],[480,250]]), | |
d3.geoOrthographic() | |
.clipExtent([[480,0],[960,250]]), | |
d3.geoOrthographic() | |
.clipExtent([[0,250],[480,500]]), | |
d3.geoOrthographic() | |
.clipExtent([[480,250],[960,500]]) | |
]; | |
//o = d3.geoCircle().center([0,0]).radius(10)(); | |
var paths = projections.map(p => d3.geoPath(p)); | |
var projection = {}; | |
projection.invert = function(p) { | |
for( var i = 0; i < projections.length; i++) { | |
var k = projections[i].invert(p); | |
if (k && paths[i]({type:"Point", coordinates: k})) | |
return k; | |
} | |
} | |
svg.on('mousemove', function(){ | |
var m = d3.mouse(this); | |
point.datum({ | |
type:"Point", | |
coordinates: projection.invert(m) | |
}) | |
}) | |
var path = function(d) { | |
return paths.map(p => p(d)) | |
.filter(d => !!d) | |
.join("") || null; | |
} | |
svg.append("path") | |
.attr("id", "sphere") | |
.datum({type: "Sphere"}) | |
.attr('d', d3.geoPath(d3.geoOrthographic())) | |
svg.append("path") | |
.datum(d3.geoGraticule()()) | |
.classed('composite', true) | |
var land = svg.append("path") | |
.attr('id', 'land') | |
.classed('composite', true); | |
var point = svg.append("path") | |
.attr('id', "invert") | |
.classed('composite', true) | |
.datum({ type:"Point", coordinates: [1,2] }) | |
d3.json("https://unpkg.com/world-atlas@1/world/110m.json", function( | |
error, | |
world | |
) { | |
land.datum(topojson.merge(world, world.objects.countries.geometries)); | |
} | |
); | |
if (1) | |
d3.timer(_ => { | |
projections[0].rotate([_/100, 0]) | |
projections[1].rotate([30, _/100, -_/100]) | |
projections[2].rotate([_/100, 0, -_/100]) | |
projections[3].rotate([_/100, _/100, _/100]) | |
svg.selectAll('path.composite') | |
.attr("d", path); | |
}) | |
</script> | |
</body> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment