用java swing.image改变透明度的方法 [英] Way to change transparency with java swing.image

问题描述

  public void paint（Graphics g）{
 screenImage = createImage（1280,720）; 
 screenGraphic = screenImage.getGraphics（）; 
 screenDraw（（Graphics2D）screenGraphic）; 
 //g.drawImage(BG，0，0，null）; 
 g.drawImage（screenImage，0，0，null）; 
 
 
 public void screenDraw（Graphics2D g）{
 g.drawImage（BG，0，0，null）; 
 Graphics2D g2 =（Graphics2D）g; 
 if（isMainScreen）{
 //g2.setComposite (alphaComposite）; 
 g2.drawImage（selectedImage，100，220，null）; 
} 
 paintComponents（g）; 
 this.repaint（）; 
} 
  

我想让selectedImage成为透明度50％或其他整数。 p>

  private Image selectedImage = new ImageIcon（Main.class.getResource（../ pic / something.jpg））。getImage（ ）; 
  

这是selectedImage，它运作良好。

解决方案

改编一下图像 - > BufferedImage 代码，然后你可以将每个像素设置为透明的

 图像selectedImage = new ImageIcon（[...]）。getImage（）; 
 
 //图片 - > BufferedImage代码
 BufferedImage img = new BufferedImage（selectedImage.getWidth（null），selectedImage.getHeight（null），BufferedImage.TYPE_INT_ARGB）; 
 Graphics2D g = img.createGraphics（）; 
 g.drawImage（selectedImage，0，0，null）; 
 g.dispose（）; 
 
 //设置每个像素为透明
 int transparency = 127; // 0-255,0不可见，255不透明
 int colorMask = 0x00FFFFFF; // AARRGGBB 
 int alphaShift = 24; 
 for（int y = 0; y< img.getHeight（）; y ++）
 for（int x = 0; x< img.getWidth（）; x ++）
 img。 setRGB（x，y，（img.getRGB（x，y）& colorMask）|（transparency<< alphaShift））; 
 
 // img现在是透明的，如果需要可以替换selectedImage（可选）
 selectedImage = img; 
如果您使用  ImageIO.read（File） 而不是 ImageIcon.getImage（），它会直接给你一个 BufferedImage  
I draw graphics in frame with this methods.
public void paint(Graphics g) {  
    screenImage = createImage(1280, 720); 
    screenGraphic = screenImage.getGraphics(); 
    screenDraw((Graphics2D) screenGraphic); 
    //g.drawImage(BG, 0, 0, null);
    g.drawImage(screenImage, 0, 0, null);
}

public void screenDraw(Graphics2D g) {
    g.drawImage(BG, 0, 0, null); 
    Graphics2D g2 = (Graphics2D)g;
    if(isMainScreen) {
        //g2.setComposite(alphaComposite);
        g2.drawImage(selectedImage, 100, 220, null);
    }
    paintComponents(g);
    this.repaint();  
}
I want to have selectedImage to be transparency 50% or other integer.
private Image selectedImage = new ImageIcon(Main.class.getResource("../pic/something.jpg")).getImage(); 
this is selectedImage, and it works well.
解决方案
Adapt a bit of Image -> BufferedImage code, and then you can set each pixel to be transparent
Image selectedImage = new ImageIcon([...]).getImage();

//Image -> BufferedImage code
BufferedImage img = new BufferedImage(selectedImage.getWidth(null), selectedImage.getHeight(null), BufferedImage.TYPE_INT_ARGB);
Graphics2D g = img.createGraphics();
g.drawImage(selectedImage, 0, 0, null);
g.dispose();

//set each pixel to be transparent
int transparency = 127; //0-255, 0 is invisible, 255 is opaque
int colorMask = 0x00FFFFFF; //AARRGGBB
int alphaShift = 24;
for(int y = 0; y < img.getHeight(); y++)
    for(int x = 0; x < img.getWidth(); x++)
        img.setRGB(x, y, (img.getRGB(x, y) & colorMask) | (transparency << alphaShift));

//img is now transparent, can replace selectedImage if you want (optional)
selectedImage = img;
If you use ImageIO.read(File) instead of ImageIcon.getImage(), it will give you a BufferedImage directly

                        
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