Java: Load image from file, edit and add to JPanel

Question

I want to load an image from my computer into 2D Graphics so that I can edit it afterwards and then I want to add it to JPanel. If you need to see my project I can

Answer 1

To load your image into the memory, you can use ImageIO.read(File). To edit it afterwards, obtain a Graphics2D instance from it by calling createGraphics():

BufferedImage img = ImageIO.read(yourFile);
Graphics2D g = img.createGraphics();
// Draw here on the graphics
g.dispose();

You can even turn on anti-alias by setting a RenderingHint before drawing:

g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
                   RenderingHints.VALUE_ANTIALIASING_ON);

Then, to add it to a JPanel, create your custom JComponent and add an instance of that component to your JPanel:

public class JImageComponent extends JComponent
{
    private BufferedImage img;

    public JImageComponent(BufferedImage bi)
    {
        img = bi;
    }

    @Override
    public void paintComponent(Graphics g)
    {
        g.drawImg(img, 0, 0, this);
    }

}