public class LineDrawer extends JPanel {

		public void paintComponent(Graphics g) {
			// clear background
			g.setColor(getBackground());
			g.fillRect(0, 0, getWidth(), getHeight());

			// ritar linjer:
			g.setColor(Color.BLACK);
			int lastX = 0;
			int lastY = 0;
			for (int x = 0; x < graphy1.size(); x++) {
				int y = graphy1.get(x);
				g.drawLine(lastX, lastY, x, y);
				lastX = x;
				lastY = y;
			}
	                g.setColor(Color.RED);
			int lastX = 0;
			int lastY = 0;
			for (int u = 0; u < graphy2.size(); u++) {
				int y = graphy2.get(x);
				g.drawLine(lastX, lastY, u, y);
				lastX = u;
				lastY = y;

}