class Transfrom {
	static fromCoordSyses(cs1, cs2){
		let tr = new Transfrom()

		tr.cs1 = cs1
		tr.cs2 = cs2

		let dx1 = cs1.x1 - cs1.x0;
		let dy1 = cs1.y1 - cs1.y0;
		let dx2 = cs2.x1 - cs2.x0;
		let dy2 = cs2.y1 - cs2.y0;

		tr.kx12 = dx1 ? dx2 / dx1 : 1;
		tr.ky12 = dy1 ? dy2 / dy1 : 1;

		return tr
	}

	trx(x){
		return (x - this.cs1.x0) * this.kx12 + this.cs2.x0;
	}

	try(y){
		return (y - this.cs1.y0) * this.ky12 + this.cs2.y0;
	}

	trp(p){
		return {x: this.trx(p.x), y: this.trx(p.y)}
	}
}

module.exports = Transfrom
module.exports.default = Transfrom