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'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;