Java Paint 组件转换成位图
我需要在位图中绘制一个组件及其所有子组件的内容.如果我想绘制整个组件,以下代码可以完美运行:
I need to draw the content of a component and all its subcomponents in a bitmap. The following code works perfectly if i want to draw the entire component :
public void printComponent(Component c, String format, String filename) throws IOException {
// Create a renderable image with the same width and height as the component
BufferedImage image = new BufferedImage(c.getWidth(), c.getHeight(), BufferedImage.TYPE_INT_ARGB);
// Render the component and all its sub components
c.paintAll(image.getGraphics());
// Render the component and ignoring its sub components
c.paint(image.getGraphics());
// Save the image out to file
ImageIO.write(image, format, new File(filename));
}
但我没有找到仅绘制此组件的 区域 的方法.有什么想法吗?
but i didn't find a way for drawing only a region of this component. Any idea ?
推荐答案
你需要这样翻译:
BufferedImage image = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
Graphics g = image.getGraphics();
g.translate(-100, -100);
c.paintComponent(g);
g.dispose();
<小时>
带有输出的完整示例:
Full example with output:
public static void main(String args[]) throws Exception {
JFrame frame = new JFrame("Test");
frame.add(new JTable(new DefaultTableModel() {
@Override
public int getColumnCount() {
return 10;
}
@Override
public int getRowCount() {
return 10;
}
@Override
public Object getValueAt(int row, int column) {
return row + " " + column;
}
}));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setVisible(true);
BufferedImage image = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
Graphics g = image.getGraphics();
g.translate(-100, -100);
frame.paintComponents(g);
g.dispose();
ImageIO.write(image, "png", new File("frame.png"));
}
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