package solarsim.renderer;

import java.awt.Canvas;
import java.awt.Graphics;
import java.util.LinkedList;
import solarsim.common.Particle;
import solarsim.common.State;
import solarsim.common.Vector;

class MyCanvas extends Canvas {

    private final LinkedList<State> states;
    MyCanvas() {
        super();
        this.setSize(800, 600);
        states = new LinkedList<State>();
    }

    void drawState(State s) {
        synchronized( states ) {
            if( states.size() == RenderConstants.MAX_STATES ) {
                states.removeLast();
            }
            states.addFirst(s);
        }
        this.repaint();
    }

    @Override
    public void paint(Graphics g) {
        g.translate(400, 300);
        g.drawLine(-300, -300, 300, 300);
        g.drawLine(-300, 300, 300, -300);
        g.drawLine(-300, -300, -300, 300);
        g.drawLine(300, -300, 300, 300);
        g.drawLine(-400, 0, 400, 0);
        g.drawLine(0, -300, 0, 300);
        synchronized(states) {
            for( State s : states ) {
                for( Particle p : s.getParticles() ) {
                    Vector r = p.getPosition();
                    int dx = +(int)(r.x/RenderConstants.SCALE_FACTOR*300);
                    int dy = -(int)(r.y/RenderConstants.SCALE_FACTOR*300);
                    g.translate(dx, dy);
                    g.fillOval(-1, -1, 3, 3);
                    g.translate(-dx, -dy);
                }
            }
        }
        g.translate(-400, -300);
    }

}