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Optimize iD.geo.dist, fixes #685

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See benchmark: http://jsperf.com/id-dist-optimization
This commit is contained in:
Tom MacWright
2013-02-08 09:46:04 -05:00
parent a773aaaab4
commit b24d03a583
1 changed files with 3 additions and 2 deletions
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5
js/id/geo.js
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@@ -9,9 +9,10 @@ iD.geo.interp = function(p1, p2, t) {
p1[1] + (p2[1] - p1[1]) * t];
};
// http://jsperf.com/id-dist-optimization
iD.geo.dist = function(a, b) {
return Math.sqrt(Math.pow(a[0] - b[0], 2) +
Math.pow(a[1] - b[1], 2));
var x = a[0] - b[0], y = a[1] - b[1];
return Math.sqrt((x * x) + (y * y));
};
iD.geo.chooseIndex = function(way, point, context) {