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SimpleCaptcha - an easy to implement CAPTCHA framework to generate image and audio challenges, for Java 1.5 and Java 6 (repackaged by Play! Framework)

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package jj.play.ns.nl.captcha.gimpy;

import java.awt.image.BufferedImage;
import jj.play.ns.com.jhlabs.image.ShadowFilter;

import static jj.play.ns.nl.captcha.util.ImageUtil.applyFilter;

/**
 * Twists text and adds a dark drop-shadow.
 * 
 * @author James Childers
 * 
 */
public class DropShadowGimpyRenderer implements GimpyRenderer {
	private static final int DEFAULT_RADIUS = 3;
	private static final int DEFAULT_OPACITY = 75;
	
	private final int _radius;
	private final int _opacity;
	
	public DropShadowGimpyRenderer() {
		this(DEFAULT_RADIUS, DEFAULT_OPACITY);
	}
	
	public DropShadowGimpyRenderer(int radius, int opacity) {
		_radius = radius;
		_opacity = opacity;
	}

	@Override
    public void gimp(BufferedImage image) {
        ShadowFilter sFilter = new ShadowFilter();
        sFilter.setRadius(_radius);
        sFilter.setOpacity(_opacity);
        applyFilter(image, sFilter);
    }
}