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package GameUtil;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import Tools.ToolBox;
/*
* Copyright 2009 Volker Oth
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Simple fader class.
* instead of doing painfully slow pixel wise gamma manipulation,
* use a square with transparency with is drawn over the whole graphic context.
*
* @author Volker Oth
*/
public class Fader {
/** width of square to use for fading */
private final static int WIDTH = 64;
/** height of square to use for fading */
private final static int HEIGHT = 64;
/** maximum alpha (opaque) */
private final static int MAX_ALPHA = 0xff;
/** Fader state */
public static enum State {
/** don't fade */
OFF,
/** fade in */
IN,
/** fade out */
OUT
}
/** current alpha value */
private static int fadeValue;
/** current fade state */
private static State fadeState = State.OFF;
/** step size for fading */
private static int fadeStep = 14;
/** color of the fading rectangle */
private static int color = 0; // black
/** alpha value of the fading rectangle */
private static int alpha = 0x80; // half transparent
/** width of faded area */
private static int width;
/** height of faded area */
private static int height;
/** the image used as fading rectangle */
private static BufferedImage alphaImg = null;
/** the graphics used as fading rectangle (static to avoid multiple allocation) */
private static Graphics2D alphaGfx;
/**
* Set color to be used for fading.
* @param c RGB color
*/
public static synchronized void setColor(final int c) {
color = c & 0xffffff;
init();
}
/**
* Set alpha value to be used for fading.
* @param a 8bit alpha value
*/
public static synchronized void setAlpha(final int a) {
alpha = a & 0xff;
init();
}
/**
* Set bounds of fading area.
* @param w width in pixels
* @param h height pixels
*/
public static synchronized void setBounds(final int w, final int h) {
width = w;
height = h;
}
/**
* Initialize fader.
*/
private static void init() {
Color fillColor; /* ARGB color of the fading rectangle composed from alpha and color */
// create alpha image if needed
if (alphaImg == null) {
alphaImg = ToolBox.createImage(WIDTH, HEIGHT, Transparency.TRANSLUCENT);
alphaGfx = alphaImg.createGraphics();
}
// fill with alpha blended color
fillColor = new Color((color>>16)&0xff, (color>>8)&0xff, color&0xff, alpha);
alphaGfx.setBackground(fillColor);
alphaGfx.clearRect(0, 0, WIDTH, HEIGHT);
}
/**
* Apply fader without changing the fader state.
* @param g graphics to apply fader to
*/
public static synchronized void apply(final Graphics g) {
for (int y=0; y<height; y+= HEIGHT)
for (int x=0; x<width; x+= WIDTH)
g.drawImage(alphaImg,x,y,null);
}
/**
* Set fader state.
* @param s state
*/
public static synchronized void setState(final State s) {
fadeState = s;
switch (fadeState) {
case IN:
fadeValue = MAX_ALPHA; // opaque
setAlpha(fadeValue);
break;
case OUT:
fadeValue = 0; // transparent
setAlpha(fadeValue);
break;
}
}
/**
* Get fader state.
* @return fader state.
*/
public static synchronized State getState() {
return fadeState;
}
/**
* Set step size.
* @param step
*/
public static void setStep(final int step) {
fadeStep = step & 0xff;
}
/**
* Fade.
* @param g graphics to fade
*/
public static synchronized void fade(final Graphics g) {
switch (fadeState) {
case IN:
if (fadeValue >= fadeStep)
fadeValue -= fadeStep;
else {
fadeValue = 0;
fadeState = State.OFF;
}
Fader.setAlpha(fadeValue);
Fader.apply(g);
// System.out.println(fadeValue);
break;
case OUT:
if (fadeValue <= MAX_ALPHA-fadeStep)
fadeValue += fadeStep;
else {
fadeValue = MAX_ALPHA;
fadeState = State.OFF;
}
Fader.setAlpha(fadeValue);
Fader.apply(g);
// System.out.println(fadeValue);
break;
}
}
}
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