source:
node_modules/d3-contour/src/area.js@
e4c61dd
| Last change on this file since e4c61dd was e4c61dd, checked in by , 6 months ago | |
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| File size: 230 bytes | |
| Rev | Line | |
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| [e4c61dd] | 1 | export default function(ring) { |
| 2 | var i = 0, n = ring.length, area = ring[n - 1][1] * ring[0][0] - ring[n - 1][0] * ring[0][1]; | |
| 3 | while (++i < n) area += ring[i - 1][1] * ring[i][0] - ring[i - 1][0] * ring[i][1]; | |
| 4 | return area; | |
| 5 | } |
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