Java applet - saving an image in a png format

Question

I am creating a simple applet for avatar-making. You can choose face, hair, eyes, etc and then save it to a disc as a png file. The simple version (without the interface for the

Answer 1

Beware quickly written and untested code!

The basic concept is this: You load the images from which you combine the avatar, then you create a new empty image and draw each part of the avatar onto it. After that you just save the newly created image to a file.

Important note: The getPath() Method will fail for unsigned applets cause of a AccessViolation. I suppose a FileChooser would be a better approach here.

import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import javax.imageio.ImageIO;

public class Avatar {
    // Graphics
    private GraphicsConfiguration config = GraphicsEnvironment
            .getLocalGraphicsEnvironment().getDefaultScreenDevice()
            .getDefaultConfiguration();

    private BufferedImage faceImage;
    private BufferedImage hairImage;
    private BufferedImage mouthImage;

    public Avatar(final String face, final String hair, final String mouth,
            final String out) {

        // Load the Image parts
        faceImage = load(face);
        hairImage = load(hair);
        mouthImage = load(mouth);

        // Combine the images
        BufferedImage outImage = combine();

        // Save the new image
        try {
            ImageIO.write(outImage, "png", new File(getPath()
                    + "screenshot.png"));
        } catch (IOException e) {
        }
    }

    // Combine
    private BufferedImage combine() {
        // Create an empty image
        BufferedImage buffer = create(200, 400, true);

        // Get the graphics context
        Graphics2D g = buffer.createGraphics();

        // Draw all 3 images onto the empty one
        g.drawImage(faceImage, 0, 0, null);
        g.drawImage(hairImage, 0, 0, null);
        g.drawImage(mouthImage, 0, 0, null);

        // Get rid of the graphics context
        g.dispose();
        return buffer;
    }

    // Image
    private URL getURL(final String filename) {
        URL url = Avatar.class.getResource(filename);
        return url;
    }

    private BufferedImage load(final String file) {
        URL filename = getURL(file);
        if (filename == null) {
            return null;
        } else {
            try {
                return ImageIO.read(filename);
            } catch (IOException e) {
                return null;
            }
        }
    }

    private BufferedImage create(final int width, final int height,
            final boolean alpha) {
        BufferedImage buffer = config.createCompatibleImage(width, height,
                alpha ? Transparency.TRANSLUCENT : Transparency.OPAQUE);
        return buffer;
    }

    // Path
    private final String getPath() {
        String path = currentPath();
        if (currentPath().toLowerCase().endsWith(".jar")) {
            path = path.substring(0, path.lastIndexOf("/") + 1);
        }
        return path;

    }

    private String currentPath() {
        try {
            return this.getClass().getProtectionDomain().getCodeSource()
                    .getLocation().toURI().getPath();
        } catch (URISyntaxException e) {
            return "";
        }
    }
}