spring.java

一些JAVA的小程序

import java.awt.*;
public class Spring implements PinBallTarget
{
	private Rectangle pad;
	private int state = 1;

	public Spring (int x, int y)
	{
		pad = new Rectangle (x, y, 30, 3);
	}

	public void moveTo(int x, int y)
	{
		pad.setLocation(x, y);
	}

	public void paint (Graphics g)
	{
		int x = pad.x; int y = pad.y;
		g.setColor(Color.black);
		if ( state == 1) {
			g.fillRect(x, y, pad.width, pad.height);
			g.drawLine(x, y+3, x+ 30, y+5);
			g.drawLine(x+30, y+5, x, y+7);
			g.drawLine(x, y+7, x+ 30, y+9);
			g.drawLine(x+30, y+9, x, y+11);
		}
		else {
			g.fillRect(x, y-8, pad.width, pad.height);
			g.drawLine(x, y+5, x+30, y-1);
			g.drawLine(x+30, y-1, x, y+3);
			g.drawLine(x, y+3, x+30, y+7);
			g.drawLine(x+30, y+7, x, y+11);
			state =1;
		}
	}

	public boolean intersects (PinBall aBall)
	{
		return pad.intersects(aBall.box());
	}

	public void hitBy(PinBall aBall)
	{
		aBall.reflectHorz();
		state = 2;
	}
}