public class TrianguloEquilatero {
	private double x, y, base, altura;

	TrianguloEquilatero (double xVS, double yVS, double xVD, double yVD) {
		this.setY(yVD);
		this.setX(xVS, xVD);
		this.setBase(xVD);
		this.setAltura(yVD, yVS);
	}

	public double area () {
		return (this.base * this.altura) / 2;
	}

	public double perimetro () {
		return (3 * this.base);
	}

	public double getX () {
		return this.x;
	}

	private void setX (double xVS, double xVD) {
		/*
		xVS = (xVD + x) / 2
		xVD + x = xVS * 2
		x = (xVS * 2) - xVD
		*/
		this.x = (xVS * 2) - xVD;
	}

	public double getBase () {
		return this.base;
	}

	private void setBase (double xVD) {
		this.base = xVD - this.x;
	}

	public double getAltura () {
		return this.altura;
	}

	private void setAltura (double yVD, double yVS) {
		this.altura = yVD - yVS;
	}

	public double getY () {
		return this.y;
	}

	private void setY (double yVD) {
		this.y = yVD;
	}

	public void mover(double dx, double dy) {
		this.x += dx;
		this.y += dy;
	}

	void redimensionar (double fatorEscala) {
		this.base *= fatorEscala;
		this.altura *= fatorEscala;
		this.perimetro();
		this.area();
	}

	public String toString () {
		double perimetro = this.perimetro();
		double area = this.area();
		return "(" + this.x + ", " + this.y + ") :.: <" + this.base + ", " + this.altura + "> :.: {" + area + " - " + perimetro + "}";
	}

}