我试图在JLayeredPane上显示多个重叠的PNG图像。
以下是生成包含图像的JLabel并将其添加到JLayeredPane的当前代码:
BufferedImage im = ImageIO.read(new File(fname));
JLabel uLabel = createLabelForImage(im);
mapLayeredPane.add(uLabel, new Integer(zIndex++), 1);
createLabelForImage()方法:
protected JLabel createLabelForImage(BufferedImage im) {
JLabel label = new JLabel(new ImageIcon(im));
label.setVerticalAlignment(JLabel.TOP);
label.setHorizontalAlignment(JLabel.CENTER);
label.setOpaque(true);
label.setBounds(0, 0, im.getWidth(), im.getHeight());
return label;
}
我得到的是物体正确重叠,但PNG图像的透明背景被一种白灰色替换。
ImageIcon有问题吗?使用JLayeredPane?也许我必须设置像label.setBakground(sort_of_transparency_code)之类的东西?
提前致谢:)
答案 0 :(得分:2)
如果您想透视,您的标签不应该是不透明的,请参阅JComponent.setOpaque
If true the component paints every pixel within its bounds.
Otherwise, the component may not paint some or all of its
pixels, allowing the underlying pixels to show through.