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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
*
* 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);
}
}
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