java 鼠标拖动图形_java怎么实现鼠标在桌面拖动过程中 画 矩形的 功能？

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import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.GraphicsDevice;

import java.awt.GraphicsEnvironment;

import java.awt.Toolkit;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.MouseMotionAdapter;

import javax.swing.JFrame;

public class RectDrawTest {

public static void main(String[] args) {

// 全屏运行

GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment()

.getDefaultScreenDevice();

gd.setFullScreenWindow(new RectDraw());

}

}

class RectDraw extends JFrame {

private static final long serialVersionUID = 1L;

int orgx, orgy, endx, endy;

Dimension d = Toolkit.getDefaultToolkit().getScreenSize();

public RectDraw() {

setVisible(true);

this.addMouseListener(new MouseAdapter() {

public void mousePressed(MouseEvent e) {

orgx = e.getX();

orgy = e.getY();

}

});

this.addMouseMotionListener(new MouseMotionAdapter() {

public void mouseDragged(MouseEvent e) {

endx = e.getX();

endy = e.getY();

Graphics g = getGraphics();

g.clearRect(0, 0, d.width, d.height);

g.setColor(Color.BLUE);

g.drawRect(orgx, orgy, endx - orgx, endy - orgy);

}

});

this.addKeyListener(new KeyAdapter() {

@Override

public void keyReleased(KeyEvent e) {

// 按Esc键退出

if (e.getKeyCode() == 27) {

System.exit(0);

}

}

});

}

}

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