添加图片到面板不使用波动 [英] Add image to panel not using swings

问题描述

如何我们面板中添加位图图像，然后让该图像是使用图形，告诉面板使用图像里面相同的图形绘制一条线。

how to we add bitmap image in panel and then get the graphics that the image is using and tell the panel to draw a line using the same graphics inside the image.

推荐答案

基本的绘画是由Swing组件做的paintComponent 方法。

Basic painting is done by a Swing components paintComponent method.

您的最佳选择是使用加载图像的ImageIO API ...

The best choice you have is to load the image using the ImageIO API...

BufferedImage image;

public void loadImage() throws IOException {
    image = ImageIO.read(...);
    // ImageIO can read a image from a file or a URL or a ImageInputStream
}

然后，只需画的形象...

Then simply paint the image...

protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    g.drawImage(image, 0, 0, this);
    // Now you can continue drawing ontop of it...
    g.setColor(Color.RED);
    g.drawLine(0, 0, image.getWidth(), image.getHeight());
}

您可能想有一个读

• 表演风俗画


• 使用图像

• Performing Custom Painting
• Working with Images

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