maplair/dist/esm/geometry/Transformation.js

JavaScript library for mobile-friendly interactive maps

import { Point } from "./Point.js";
//#region src/geometry/Transformation.js
var Transformation = class {
	constructor(a, b, c, d) {
		if (Array.isArray(a)) {
			this._a = a[0];
			this._b = a[1];
			this._c = a[2];
			this._d = a[3];
			return;
		}
		this._a = a;
		this._b = b;
		this._c = c;
		this._d = d;
	}
	transform(point, scale) {
		return this._transform(new Point(point), scale);
	}
	_transform(point, scale) {
		scale ||= 1;
		point.x = scale * (this._a * point.x + this._b);
		point.y = scale * (this._c * point.y + this._d);
		return point;
	}
	untransform(point, scale) {
		scale ||= 1;
		return new Point((point.x / scale - this._b) / this._a, (point.y / scale - this._d) / this._c);
	}
};
//#endregion
export { Transformation };

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