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StackOverflow 文件
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Java Language 教程
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以程式設計方式建立影象
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以程式設計方式建立簡單影象並顯示它
class ImageCreationExample {
static Image createSampleImage() {
// instantiate a new BufferedImage (subclass of Image) instance
BufferedImage img = new BufferedImage(640, 480, BufferedImage.TYPE_INT_ARGB);
//draw something on the image
paintOnImage(img);
return img;
}
static void paintOnImage(BufferedImage img) {
// get a drawable Graphics2D (subclass of Graphics) object
Graphics2D g2d = (Graphics2D) img.getGraphics();
// some sample drawing
g2d.setColor(Color.BLACK);
g2d.fillRect(0, 0, 640, 480);
g2d.setColor(Color.WHITE);
g2d.drawLine(0, 0, 640, 480);
g2d.drawLine(0, 480, 640, 0);
g2d.setColor(Color.YELLOW);
g2d.drawOval(200, 100, 240, 280);
g2d.setColor(Color.RED);
g2d.drawRect(150, 70, 340, 340);
// drawing on images can be very memory-consuming
// so it's better to free resources early
// it's not necessary, though
g2d.dispose();
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Image img = createSampleImage();
ImageIcon icon = new ImageIcon(img);
frame.add(new JLabel(icon));
frame.pack();
frame.setVisible(true);
}
}