Search code examples
javascalebufferedimagetoolkit

How to get scaled instance of a bufferedImage

I wanted to get scaled instance of a buffered image and I did:

public void analyzePosition(BufferedImage img, int x, int y){   
     img =  (BufferedImage) img.getScaledInstance(getWidth(), getHeight(), Image.SCALE_SMOOTH);
....
}

but I do get an exception:

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: sun.awt.image.ToolkitImage cannot be cast to java.awt.image.BufferedImage
    at ImagePanel.analyzePosition(ImagePanel.java:43)

I wanted then to cast to ToolkitImage then use the method getBufferedImage I read about in other articles. The problem is there is no class such as sun.awt.image.ToolkitImage I cannot cast to it because Eclipse does not even see this class. I use Java 1.7 and jre1.7.

enter image description here

Solution

  • You can create a new image, a BufferedImage with the TookitImage.

    Image toolkitImage = img.getScaledInstance(getWidth(), getHeight(), 
      Image.SCALE_SMOOTH);
int width = toolkitImage.getWidth(null);
int height = toolkitImage.getHeight(null);

// width and height are of the toolkit image
BufferedImage newImage = new BufferedImage(width, height, 
      BufferedImage.TYPE_INT_ARGB);
Graphics g = newImage.getGraphics();
g.drawImage(toolkitImage, 0, 0, null);
g.dispose();

// now use your new BufferedImage