This example demonstrates how to use d3.geoIdentity to clip a polygon to an extent while rendering. You can save the resulting clipped polygon using d3.geoProject.
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January 23, 2017 18:15
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Polygon Clipping I
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| license: gpl-3.0 | |
| height: 600 |
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| <!DOCTYPE html> | |
| <svg width="960" height="600"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/topojson.v2.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"); | |
| svg.append("rect") | |
| .attr("fill", "blue") | |
| .attr("x", 100) | |
| .attr("y", 100) | |
| .attr("width", 760) | |
| .attr("height", 400); | |
| d3.json("https://d3js.org/us-10m.v1.json", function(error, us) { | |
| if (error) throw error; | |
| var nation = topojson.feature(us, us.objects.nation); | |
| svg.append("path") | |
| .attr("fill", "red") | |
| .attr("d", d3.geoPath()(nation)); | |
| svg.append("path") | |
| .attr("fill", "black") | |
| .attr("stroke", "white") | |
| .attr("d", d3.geoPath(d3.geoIdentity().clipExtent([[100, 100], [860, 500]]))(nation)); | |
| }); | |
| </script> |
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