如何获得bufferedImage的缩放实例 [英] How to get scaled instance of a bufferedImage

问题描述

我想得到缓存图像的缩放实例，我做了：

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);
....
}

但我得到一个例外：

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)

我想要转换为 ToolkitImage 然后使用方法 getBufferedImage 我在其他文章中读到过。问题是没有类，如 sun.awt.image.ToolkitImage 我无法转换它，因为Eclipse甚至没有看到这个类。我使用 Java 1.7 和 jre1.7 。

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.

推荐答案

你可以使用TookitImage创建一个新的图像，一个BufferedImage。

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

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