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ProGuard is a free Java class file shrinker, optimizer, and obfuscator. It removes unused classes, fields, methods, and attributes. It then optimizes the bytecode. It then renames the remaining classes, fields, and methods using short meaningless names. Finally, it preverifies the processed code for Java 6 or for Java Micro Edition.

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/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2009 Eric Lafortune ([email protected])
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.gui.splash;

import java.awt.*;

/**
 * This Sprite adds a drop shadow to another Sprite.
 *
 * @author Eric Lafortune
 */
public class ShadowedSprite implements Sprite
{
    private final VariableInt    xOffset;
    private final VariableInt    yOffset;
    private final VariableDouble alpha;
    private final VariableInt    blur;
    private final Sprite         sprite;

    private float cachedAlpha = -1.0f;
    private Color cachedColor;


    /**
     * Creates a new ShadowedSprite.
     * @param xOffset the variable x-offset of the shadow, relative to the sprite itself.
     * @param yOffset the variable y-offset of the shadow, relative to the sprite itself.
     * @param alpha   the variable darkness of the shadow (between 0 and 1).
     * @param blur    the variable blur of the shadow (0 for sharp shadows, 1 or
     *                more for increasingly blurry shadows).
     * @param sprite  the Sprite to be painted with its shadow.
     */
    public ShadowedSprite(VariableInt    xOffset,
                          VariableInt    yOffset,
                          VariableDouble alpha,
                          VariableInt    blur,
                          Sprite         sprite)
    {
        this.xOffset = xOffset;
        this.yOffset = yOffset;
        this.alpha   = alpha;
        this.blur    = blur;
        this.sprite  = sprite;
    }


    // Implementation for Sprite.

    public void paint(Graphics graphics, long time)
    {
        double l = alpha.getDouble(time);
        int    b = blur.getInt(time) + 1;

        float a = 1.0f - (float)Math.pow(1.0 - l, 1.0/(b*b));
        if (a != cachedAlpha)
        {
            cachedAlpha = a;
            cachedColor = new Color(0f, 0f, 0f, a);
        }

        // Set up the shadow graphics.
        //OverrideGraphics2D g = new OverrideGraphics2D((Graphics2D)graphics);
        //g.setOverrideColor(cachedColor);

        // Set the shadow color.
        Color actualColor = graphics.getColor();
        graphics.setColor(cachedColor);

        int xo = xOffset.getInt(time) - b/2;
        int yo = yOffset.getInt(time) - b/2;

        // Draw the sprite's shadow.
        for (int x = 0; x < b; x++)
        {
            for (int y = 0; y < b; y++)
            {
                int xt = xo + x;
                int yt = yo + y;
                graphics.translate(xt, yt);
                sprite.paint(graphics, time);
                graphics.translate(-xt, -yt);
            }
        }

        // Restore the actual sprite color.
        graphics.setColor(actualColor);

        // Draw the sprite itself in the ordinary graphics.
        sprite.paint(graphics, time);
    }
}