一、介紹
最近發現桌面上顯示的透明圖片和動態圖片看起來不錯,於是研究了一下java能否做到這一點。使用JFrame基本是可以實現的,但是還有些缺陷。其中,核心語句是
jframe.setBackground(new Color(0,0,0,0));
jPanel.setBackground(new Color(0,0,0,0));
這兩句都寫上,才能實現透明圖片的效果。
//網上說這句也可以:AWTUtilities.setWindowOpaque(frame, false);
//不過我加上不行,是jdk1.8不支持嗎?還是win10下不支持呢?
直接上截圖與代碼了:
1.透明圖片:
2.動態圖片(gif):
3.有問題的動態圖片(本來應該是雪花效果的,要不不透明,要不就長這樣,不會調了):
二、代碼
1.透明圖片
import java.awt.*;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class noBankImg {
public static void main(String[] args) {
new noBankImg();
}
public noBankImg(){
start();
}
public static void start() {
final JFrame frame = new JFrame();
//設置在最頂層
frame.setAlwaysOnTop(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//設置隱藏標題欄與無法移動
frame.setUndecorated(true);
//禁止改變大小
frame.setResizable(false);
//設置出現位置
frame.setLocation(frame.getToolkit().getScreenSize().width-300, frame.getToolkit().getScreenSize().height-350);
//設置大小
frame.setSize(300, 300);
//這句不能用,無效,不兼容
//AWTUtilities.setWindowOpaque(frame, false);
//設置背景透明
frame.setBackground(new Color(0,0,0,0));
final JPanel pane = new JPanel() {
@Override
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2d = (Graphics2D) g;
InputStream imgIS = this.getClass().getResourceAsStream("t3.png");
Image image = null;
try {
image = ImageIO.read(imgIS);
} catch (IOException e) {
e.printStackTrace();
}
g2d.drawImage(image, 0, 0,300,300, null);
}
};
//設置背景透明
pane.setBackground(new Color(0,0,0,0));
frame.setContentPane(pane);
//設置完畢後再顯示
frame.setVisible(true);
}
}
2.動態圖片(圖片原本是gif的,不過重命名成jpg也不影響)
import java.awt.*;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
//動圖
public class t1 extends JFrame {
public t1() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setSize(400, 300);
//設置在最頂層
setAlwaysOnTop(true);
//設置出現位置
setLocation(getToolkit().getScreenSize().width-400, getToolkit().getScreenSize().height-350);
//設置隱藏標題欄與無法移動
setUndecorated(true);
//禁止改變大小
setResizable(false);
getContentPane().setLayout(null);
JPanel panel = new ImagePanel();
panel.setBounds(0, 0, 400, 300);
//設置背景透明
setBackground(new Color(0,0,0,0));
//panel.setBackground(new Color(0,0,0,0));
getContentPane().add(panel);
setVisible(true);
}
public static void main(String[] args) {
new t1();
}
class ImagePanel extends JPanel {
public void paint(Graphics g) {
super.paint(g);
ImageIcon icon = new ImageIcon(this.getClass().getResource("t5.jpg"));
g.drawImage(icon.getImage(), 0, 0, 400, 300, this);
}
}
}
3.有問題的動態圖片
import com.sun.awt.AWTUtilities;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.io.IOException;
import java.io.InputStream;
//pane.setBackground(new Color(0,0,0,0));
//AWTUtilities.setWindowOpaque(frame, false);
public class t3 {
public static void main(String[] args) {
new t3();
}
public t3(){
start();
}
public static void start() {
final JFrame frame = new JFrame();
frame.setAlwaysOnTop(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
//這句不能用,無效,不兼容
//AWTUtilities.setWindowOpaque(frame, false);
frame.setBackground(new Color(0,0,0,0));
final JPanel pane = new JPanel() {
private int[] snowX = null;
private int[] snowY = null;
private int[] angles = null;
private int count = 50;
@Override
public void paint(Graphics g) {
super.paint(g);
Rectangle bounds = frame.getBounds();
if (snowX == null) {
snowX = new int[count];
for (int i = 0; i < snowX.length; i++) {
snowX[i] = getRandomInt(bounds.width);
}
snowY = new int[count];
for (int i = 0; i < snowY.length; i++) {
snowY[i] = getRandomInt(bounds.height);
}
angles = new int[count];
for (int i = 0; i < snowY.length; i++) {
angles[i] = getRandomInt(360);
}
}
Graphics2D g2d = (Graphics2D) g;
InputStream imgIS = this.getClass().getResourceAsStream("t3.png");
Image image = null;
try {
image = ImageIO.read(imgIS);
} catch (IOException e) {
e.printStackTrace();
}
for (int i = 0; i < count; i++) {
snowX[i] += getRandomInt(5) - 3;
snowY[i] += 5;
angles[i] += i / 5;
snowY[i] = snowY[i] > bounds.height ? 0 : snowY[i];
angles[i] = angles[i] > 360 ? 0 : angles[i];
int x = snowX[i];
int y = snowY[i];
int angle = angles[i];
g2d.translate(x, y);
double angleValue = Math.toRadians(angle);
g2d.rotate(angleValue);
g2d.drawImage(image, 0, 0, null);
g2d.rotate(-angleValue);
g2d.translate(-x, -y);
}
}
};
//設置透明背景
pane.setBackground(new Color(0,0,0,0));
frame.setContentPane(pane);
frame.setVisible(true);
Thread thread = new Thread() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(10);
} catch (Exception ex) {
ex.printStackTrace();
}
pane.repaint();
}
}
};
thread.start();
}
public static int getRandomInt(int width) {
int i = 0;
double d = Math.random() * width;
i = (int)d;
return i;
}
}
三、說明
以上代碼可以直接使用。
有問題的動態圖片的代碼,還請大佬看看怎麼優化;要不實現不了透明效果,要不就是那樣,有重疊,很尷尬。