import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import com.sun.awt.AWTUtilities;
/*
創(chuàng)建無(wú)規(guī)則的窗口: http://www.javaeye.com/topic/707514
在程序中依次設(shè)置以下幾個(gè)參數(shù)：
1. 設(shè)置窗口完全透明：AWTUtilities.setWindowOpaque(frame, false); // false支持拖動(dòng)，很關(guān)鍵
2. 設(shè)置窗口無(wú)邊緣：frame.setUndecorated(true);
3. 設(shè)置窗口的ContentPane為要顯示的Pane：frame.setContentPane(myPane);
在myPane中放置具體要顯示的內(nèi)容，也可以重載paint方法進(jìn)行Java2D繪制。這些paint會(huì)直接發(fā)生在桌面背景上。
接下來(lái)，就是見(jiàn)證奇跡的時(shí)刻！
*/
@SuppressWarnings("restriction")
public class ArbitrayShapeWindow {
@SuppressWarnings({ "serial" })
public static void main(String[] args) {
JPanel panel = new JPanel() {
private Image img = new ImageIcon("resources/shape.png").getImage();
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setPaint(Color.red);
g2d.drawImage(img, 0, 0, img.getWidth(this), img.getHeight(this), null);
}
};
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
AWTUtilities.setWindowOpaque(frame, false);
frame.setContentPane(panel);
//frame.setSize(500, 500); // frame不能用pack()函數(shù)
frame.setAlwaysOnTop(true); // 窗口最前面顯示
frame.setExtendedState(JFrame.MAXIMIZED_BOTH); // 最大寬度
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
From: Swing第三刀：做套ERP，要配得上我的登錄界面！