32 lines
779 B
JavaScript
32 lines
779 B
JavaScript
define(function () {
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var self = {};
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self.distance = function distance(a, b) {
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return (a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y);
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};
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self.distancePoint = function distancePoint(a, b) {
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return Math.sqrt(self.distance(a, b));
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};
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self.distanceLink = function distanceLink(p, a, b) {
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/* http://stackoverflow.com/questions/849211 */
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var l2 = self.distance(a, b);
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if (l2 === 0) {
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return self.distance(p, a);
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}
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var t = ((p.x - a.x) * (b.x - a.x) + (p.y - a.y) * (b.y - a.y)) / l2;
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if (t < 0) {
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return self.distance(p, a);
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} else if (t > 1) {
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return self.distance(p, b);
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}
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return self.distancePoint(p, {
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x: a.x + t * (b.x - a.x),
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y: a.y + t * (b.y - a.y)
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});
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};
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return self;
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});
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