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rudimentary area cache

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This commit is contained in:
Tonny2442 2022-04-06 15:31:21 -04:00
parent 31b83c6a1b
commit b1237d3bae
1 changed files with 10 additions and 1 deletions
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11
web/_js/atlas.js
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@ -39,9 +39,15 @@ function getPositionOfEntry(entry){
return [parseInt(startX), parseInt(startY)];
}
const areaMap = new Map();
// Modified from https://stackoverflow.com/a/33670691
function calcPolygonArea(vertices) {
var hit = areaMap.get(vertices);
if (hit != null) {
return hit;
}
var total = 0;
for (var i = 0, l = vertices.length; i < l; i++) {
@ -54,5 +60,8 @@ function calcPolygonArea(vertices) {
total -= (subX * subY * 0.5);
}
return Math.floor(Math.abs(total));
var area = Math.floor(Math.abs(total));
areaMap.set(vertices, area);
return area;
}