package automatvgi;

import java.awt.Graphics;

import automatvgi.tools.Point;
import automatvgi.tools.Vector;

public class Projection {
	private Vector translation = new Vector(0, 0);
	private Point centre = null;
	private Vector vi = new Vector(20, 0);
	private double arr = .5;

	public double getArr() {
		return arr;
	}

	public Vector getTranslation() {
		return translation;
	}

	public Vector getVi() {
		return vi;
	}

	public Projection() {
	}

	public void setCentre(Point centre) {
		this.centre = centre.addTo(translation);
	}

	public double getExactAbs(Point p) {
		return p.getX() * vi.getX() + p.getY() * vi.getY() + centre.getX();
	}

	public double getExactOrd(Point p) {
		return p.getX() * vi.getY() - p.getY() * vi.getX() - centre.getY();
	}

	public int getAbs(Point p) {
		return (int) getExactAbs(p);
	}

	public int getOrd(Point p) {
		return (int) getExactOrd(p);
	}

	public Point getExactPoint(int x, int y) {
		double mx = ((x - centre.getX()) * vi.getX() + (y + centre.getY())
				* vi.getY())
				/ (vi.getX() * vi.getX() + vi.getY() * vi.getY()), my = ((x - centre
				.getX())
				* vi.getY() - (y + centre.getY()) * vi.getX())
				/ (vi.getX() * vi.getX() + vi.getY() * vi.getY());
		return new Point(mx, my);
	}

	public Point getPoint(int x, int y) {
		Point p = getExactPoint(x, y);
		double mx = p.getX(), my = p.getY();
		// if(mx>0) mx+=.5; else mx-=.5;
		// if(my>0) my+=.5; else my-=.5;
		mx = ((int) (mx / arr)) * arr;
		my = ((int) (my / arr)) * arr;
		double d = 2 * (mx - p.getX());
		if (d > arr)
			mx -= arr;
		else if (d < -arr)
			mx += arr;
		d = 2 * (my - p.getY());
		if (d > arr)
			my -= arr;
		else if (d < -arr)
			my += arr;
		return new Point(mx, my);
	}

	public void drawLine(Point a, Point b, Graphics g) {
		g.drawLine(getAbs(a), getOrd(a), getAbs(b), getOrd(b));
	}

	public int cmToPix(double l) {
		return (int) (l * vi.norm());
	}

	public int mmToPix(double l) {
		return (int) (l * vi.norm() / 10);
	}

}