'use strict'; function Point(x, y) { this.x = x; this.y = y; } Point.prototype.add = function (point) { return new Point(this.x + point.x, this.y + point.y); }; Point.prototype.sub = function (point) { return new Point(this.x - point.x, this.y - point.y); }; Point.prototype.mul = function (value) { return new Point(this.x * value, this.y * value); }; Point.prototype.div = function (value) { return new Point(this.x / value, this.y / value); }; Point.prototype.dist = function () { return Math.sqrt(this.x * this.x + this.y * this.y); }; Point.prototype.sqr = function () { return this.x * this.x + this.y * this.y; }; /* * Check if 3 points are in line, and second in the midle. * Used to replace quad curves with lines or join lines * */ function isInLine(p1, m, p2, accuracy) { var a = p1.sub(m).sqr(); var b = p2.sub(m).sqr(); var c = p1.sub(p2).sqr(); // control point not between anchors if ((a > (b + c)) || (b > (a + c))) { return false; } // count distance via scalar multiplication var distance = Math.sqrt(Math.pow((p1.x - m.x) * (p2.y - m.y) - (p2.x - m.x) * (p1.y - m.y), 2) / c); return distance < accuracy ? true : false; } module.exports.Point = Point; module.exports.isInLine = isInLine;