2011-01-13 58 views
0

我试图调整一个图像我已经绘制到ImagePanel(扩展JPanel),它似乎并没有工作。我从互联网上得到了一些覆盖组件paint()方法的示例代码,我想这可能是问题,这是我的代码。Java Swing:调整JPanel的大小与图像

public void paintComponent(Graphics g) { 
    super.paintComponent(g); 
    if (img != null) { // Scale it by width int scaledWidth = (int)((img.getWidth() * getHeight()/img.getHeight())); 
     // If the image is not off the screen horizontally... 
     if (scaledWidth < getWidth()) { 
      // Center the left and right destination x coordinates. 

      int leftOffset = getWidth()/2 - scaledWidth/2; 
      int rightOffset = getWidth()/2 + scaledWidth/2; 
      g.drawImage(img, leftOffset, 0, rightOffset, getHeight(), 0, 0, img.getWidth(), img.getHeight(), null); 
     } 
     // Otherwise, the image width is too much, even scaled 
     // So we need to center it the other direction 
     else { 
      int scaledHeight = (img.getHeight() * getWidth())/img.getWidth(); 

      int topOffset = getHeight()/2 - scaledHeight/2; 
      int bottomOffset = getHeight()/2 + scaledHeight/2; 

      g.drawImage(img, 0, topOffset, getWidth(), bottomOffset, 0, 0, img.getWidth(), img.getHeight(), null); 
     } 
    } 
} 

,我从调用它...

public void resetImage(double width, double height) { 
    BufferedImage scaledImage = new BufferedImage((int)width, (int)height,BufferedImage.TYPE_INT_ARGB); 
    // Paint scaled version of image to new image 
    Graphics2D graphics2D = scaledImage.createGraphics(); 
    graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR); 

    this.setSize((int)img.getWidth(), (int)img.getHeight()); 
    graphics2D.drawImage(this.img, 0, 0, (int)width, (int)height, null); graphics2D.dispose(); 
} 

(其中宽度和高度,在此blurp是新的宽度和高度加以应用。

感谢。

+1

什么不起作用?你期望发生什么?给我们更多的好处 - 我们不会重新创建你的环境来帮助你。 – I82Much 2011-01-13 21:34:44

回答

1

您确定要调用方法paintComponent吗?尝试拨打ImagePanel.repaint()结束时resetImage