https://shaik-optom.ru/g/s3/misc/math/0.0.1/s3.math.js

1/* masalygin 0.0.1 */
2'use strict';
3
4(function(factory) {
5
6	if (typeof define === 'function' && define.amd) {
7
8		define([], factory);
9
10	} else {
11
12		factory();
13
14	}
15
16})(function() {
17
18	function Line(a, b) {
19		this.a = a;
20		this.b = b;
21	}
22
23	Line.prototype.len = function() {
24		var dx = this.a.x - this.b.x,
25			dy = this.a.y - this.b.y;
26
27		return Math.sqrt(dx * dx + dy * dy);
28	};
29
30	function Triangle(a, b, c) {
31		this.a = a;
32		this.b = b;
33		this.c = c;
34	}
35
36	Triangle.prototype.square = function() {
37		var ab = (new Line(this.a, this.b)).len(),
38			bc = (new Line(this.b, this.c)).len(),
39			ac = (new Line(this.a, this.c)).len(),
40			p = (ab + bc + ac) / 2;
41
42		return Math.sqrt(p * (p - ab) * (p - bc) * (p - ac));
43	};
44
45	Triangle.prototype.hasPoint = function(p, d) {
46		var abp = (new Triangle(this.a, this.b, p)).square(),
47			acp = (new Triangle(this.a, this.c, p)).square(),
48			bcp = (new Triangle(this.b, this.c, p)).square(),
49			sum = abp + acp + bcp,
50			dS = Math.abs(sum - this.square());
51
52		d = (typeof d === 'undefined') ? 0 : d;
53
54		if (dS < d) {
55			return true;
56		} else {
57			return false;
58		}
59	};
60
61	window.s3Math = {
62		Line: Line,
63		Triangle: Triangle
64	};
65
66	return window.s3Math;
67
68});