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