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VCAFE.3.0A
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FadeFilter.java
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1998-08-21
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package symantec.itools.awt.image;
import java.awt.Color;
import java.awt.image.RGBImageFilter;
import java.awt.image.ColorModel;
import java.awt.image.DirectColorModel;
import java.lang.IllegalArgumentException;
import java.util.ResourceBundle;
import java.text.MessageFormat;
// Written by Levi Brown and Micheal Hopkins 1.1, July 8, 1997.
/**
* An Image filter to use for fading an Image towards a specified Color by a specified percent.
* @version 1.1, July 8, 1997
* @author Symantec
*/
public class FadeFilter extends RGBImageFilter
{
/**
* Constructs a default FadeFilter.
* By default the Image is faded 50% towards Color.lightGray.
* @see FadeFilter#FadeFilter(double)
* @see FadeFilter#FadeFilter(java.awt.Color)
* @see FadeFilter#FadeFilter(double, java.awt.Color)
* @see #setPercent
* @see #setFadeToColor
*/
public FadeFilter()
{
this(0.50, Color.lightGray);
}
/**
* Constructs a FadeFilter.
* By default the Image is faded towards Color.lightGray.
* @param percent the percent to fade towards the specified color
* @see FadeFilter#FadeFilter()
* @see FadeFilter#FadeFilter(java.awt.Color)
* @see FadeFilter#FadeFilter(double, java.awt.Color)
* @see #setFadeToColor
*/
public FadeFilter(double percent)
{
this(percent, Color.lightGray);
}
/**
* Constructs a FadeFilter.
* By default the Image is faded 50%.
* @param fadeToColor the color to fade to
* @see FadeFilter#FadeFilter()
* @see FadeFilter#FadeFilter(double)
* @see FadeFilter#FadeFilter(double, java.awt.Color)
* @see #setPercent
*/
public FadeFilter(Color fadeToColor)
{
this(0.50, fadeToColor);
}
/**
* Constructs a FadeFilter.
* @param percent the percent to fade towards the specified color
* @param fadeToColor the color to fade to
* @see FadeFilter#FadeFilter()
* @see FadeFilter#FadeFilter(double)
* @see FadeFilter#FadeFilter(java.awt.Color)
*/
public FadeFilter(double percent, Color fadeToColor)
{
errors = ResourceBundle.getBundle("symantec.itools.resources.ErrorsBundle");
canFilterIndexColorModel = true;
try
{
setPercent(percent);
}
catch (IllegalArgumentException exc)
{
Object[] args = { new Double(percent) };
System.err.println("FadeFilter: " + errors.getString("InvalidPercent1"));
System.err.println(" " + errors.getString("InvalidPercent2"));
System.err.println(" " + errors.getString("InvalidPercent3"));
try { setPercent(0.50); } catch (IllegalArgumentException exc2) {}
}
try
{
setFadeToColor(fadeToColor);
}
catch (NullPointerException exc)
{
System.err.println("FadeFilter: Null parameter value passed to constructor:");
System.err.println(" fadeToColor is null");
System.err.println(" Defaulting to Color.lightGray.");
setFadeToColor(Color.lightGray);
}
}
/**
* Sets the color to fade to when filtering.
* @param fadeTo the color to fade to
* @see #getFadeToColor
*/
public void setFadeToColor(Color fadeTo)
{
to_r = fadeTo.getRed();
to_g = fadeTo.getGreen();
to_b = fadeTo.getBlue();
}
/**
* Gets the color used to fade to when filtering.
* @return the color used to fade to
* @see #setFadeToColor
*/
public Color getFadeToColor()
{
return new Color(to_r, to_g, to_b);
}
/**
* Sets the percentage to fade when filtering.
* @param percent the percentage to fade
* @exception IllegalArgumentException
* if the specified percentage value is unacceptable
* @see #getPercent
*/
public void setPercent(double percent) throws IllegalArgumentException
{
symantec.itools.util.GeneralUtils.checkValidPercent(percent);
this.percent = percent;
}
/**
* Gets the percentage to fade when filtering.
* @return the percentage to fade
* @see #setPercent
*/
public double getPercent()
{
return percent;
}
/**
* Filters an RGB value using the current fade settings.
* @param x unused
* @param y unused
* @param rgb the rgb value to fade
* @return the faded rgb value
*/
public int filterRGB( int x, int y, int rgb )
{
DirectColorModel cm = (DirectColorModel)ColorModel.getRGBdefault();
int alpha = cm.getAlpha(rgb);
int from_r = cm.getRed(rgb);
int from_g = cm.getGreen(rgb);
int from_b = cm.getBlue(rgb);
int r, g, b;
if (from_r > to_r)
r = to_r + (int)((from_r - to_r)* (1 - percent));
else
r = to_r - (int)((to_r - from_r)* (1 - percent));
if (from_g > to_r)
g = to_g + (int)((from_g - to_g)* (1 - percent));
else
g = to_g - (int)((to_g - from_g)* (1 - percent));
if (from_b > to_b)
b = to_b + (int)((from_b - to_b)* (1 - percent));
else
b = to_b - (int)((to_b - from_b)* (1 - percent));
alpha = alpha << 24;
r = r << 16;
g = g << 8;
return alpha | r | g | b;
}
/**
* The percentage to fade when filtering.
* @see #getPercent
* @see #setPercent
*/
protected double percent;
/**
* The red value of the color to fade to when filtering.
* @see #getFadeToColor
* @see #setFadeToColor
*/
protected int to_r;
/**
* The green value of the color to fade to when filtering.
* @see #getFadeToColor
* @see #setFadeToColor
*/
protected int to_g;
/**
* The blue value of the color to fade to when filtering.
* @see #getFadeToColor
* @see #setFadeToColor
*/
protected int to_b;
/**
* Error strings.
*/
transient protected ResourceBundle errors;
}