如何製作Alpha漸變蒙版？

Question

我試圖做這樣的事情：用 Alpha Gradient Mask的JavaFX

如何做到這一點任何想法？

Answer 1

我找到了一種方法來處理「AlphaComposite」函數。

這裏是我的代碼：

private Image mask; 
private Image dest; 
private float alpha = 1f; 

private void loadImages() { 

    mask = new ImageIcon("resources/source.png").getImage(); 
    dest = new ImageIcon("resources/destination.png").getImage(); 
} 

private void doDrawing(Graphics g) { 

    Graphics2D g2d = (Graphics2D) g.create(); 

    BufferedImage buffImg = new BufferedImage(500, 400, 
      BufferedImage.TYPE_INT_ARGB); 
    Graphics2D gbi = buffImg.createGraphics(); 

    AlphaComposite ac = AlphaComposite.getInstance(
      AlphaComposite.SRC_IN, alpha); 

    gbi.drawImage(mask, 0, 0, null); 
    gbi.setComposite(ac); 
    gbi.drawImage(dest, 0, 0, null); 

    g2d.drawImage(buffImg, 20, 20, null); 

    gbi.dispose(); 
    g2d.dispose(); 
} 

這裏是我得到：

Original image & Mask

Result

我願做同樣的事情在JavaFX因爲我使用Javafx圖像（或來自OPENCV Library的Mat圖像）。