Rampa

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JComponent;

/*
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/**
 *
 * @author sused
 */
public class Rampa extends JComponent {

    protected int x1;
    protected int y1;
    protected int x2;
    protected int y2;




    public Rampa() {

    x1 = 10;
    y1 = 170;
    x2 = 180;
    y2 = 170;
    setBounds(0,0,200,300);
    }

    public void up(){
      if(x1 < x2 )  {
        x1+=2;
        y1-=2;
      }
      repaint();
    }

    public void down() {
      if (y1 < y2) {
        x1-=2;
        y1+=2;
      }
      repaint();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.fillRect(160, 160, 30, 130);
        g.setColor(Color.yellow);
        g.drawLine(x1, y1, x2, y2);
    }

}