?? paintrect.java
字號:
package PaintRect;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class PaintRect extends JFrame {
private int x, y, a, b;
public PaintRect() {
super("DrawRect here");
getContentPane().add(new JLabel("Drag the mouse to draw"),
BorderLayout.SOUTH);
addMouseMotionListener(
new MouseMotionAdapter() {
public void mouseDragged(MouseEvent event) {
a = event.getX();
b = event.getY();
repaint();
}
}
);
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent event) {
x = event.getX();
y = event.getY();
}
public void mouseReleased(MouseEvent event) {
a = event.getX();
b = event.getY();
}
});
setSize(300, 150);
setVisible(true);
}
public void paint(Graphics g) {
super.paint(g);
g.drawRect(x, y, Math.abs(a - x), Math.abs(b - y));
}
public static void main(String args[]) {
PaintRect application = new PaintRect();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -