Java BufferedImage Operation waterMarkImage(final BufferedImage image, final String text)

Description

Watermarks the given image with given text.

License

Apache License

Parameter

Parameter	Description
image	Image to be watermarked
text	text to be used as a watermark.

Return

new watermarked image.

Declaration

public static BufferedImage waterMarkImage(final BufferedImage image, final String text) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;

import java.awt.Graphics2D;
import java.awt.RenderingHints;

import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;

public class Main {
    /**//from ww  w . ja va2  s .c om
     * Watermarks the given image with given text.
     * @param image Image to be watermarked
     * @param text text to be used as a watermark.
     * @return new watermarked image.
     */
    public static BufferedImage waterMarkImage(final BufferedImage image, final String text) {
        if (image == null) {
            throw new IllegalArgumentException("\"image\" param cannot be null.");
        }
        // create a new image
        final BufferedImage waterMarked = new BufferedImage(image.getWidth(), image.getHeight(), image.getType());
        final Graphics2D imageG = waterMarked.createGraphics();
        // draw original image.
        imageG.drawImage(image, null, 0, 0);
        imageG.dispose();

        final Graphics2D g = waterMarked.createGraphics();
        g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f)); // 50% transparency
        g.setColor(Color.white);
        g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        g.setFont(new Font("Arial", Font.BOLD, 30));
        final FontMetrics fontMetrics = g.getFontMetrics();
        final Rectangle2D rect = fontMetrics.getStringBounds(text, g);
        final int centerX = (image.getWidth() - (int) rect.getWidth()) / 2;
        final int centerY = (image.getHeight() - (int) rect.getHeight()) / 2;
        g.drawString(text, centerX, centerY);
        g.dispose();
        return waterMarked;
    }
}

Related

1. tintImage(BufferedImage src, Color color, float tintOpacity)
2. unweaveFrom(BufferedImage bufferedImage)
3. updateImageSpecifications( BufferedImage bufferedImage)
4. validateSelectionRectangle(BufferedImage image, Rectangle selection)
5. verticalGradient(BufferedImage image, Graphics2D g2d, Color... colors)
6. weaveInto(BufferedImage bufferedImage, String message)