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Java Source | 1998-03-18 | 2.9 KB | 117 lines |
- package symantec.itools.awt.image;
-
- 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 lightening an Image a specified percentage.
- * @version 1.1, July 8, 1997
- * @author Symantec
- */
- public class LightenFilter extends RGBImageFilter
- {
- /**
- * Constructs a default LightenFilter.
- * By default the Image is lightened 50%.
- * @see LightenFilter#LightenFilter(double)
- * @see #setPercent
- */
- public LightenFilter()
- {
- this(0.50);
- }
-
- /**
- * Constructs a LightenFilter.
- * @param percent the percent to lighten the image when filtering.
- * @see LightenFilter#LightenFilter()
- * @see #setPercent
- */
- public LightenFilter(double percent)
- {
- errors = ResourceBundle.getBundle("symantec.itools.resources.ErrorsBundle");
- canFilterIndexColorModel = true;
- try
- {
- setPercent(percent);
- }
- catch (IllegalArgumentException exc)
- {
- Object[] args = { new Double(percent) };
- System.err.println("LightenFilter: " + errors.getString("InvalidPercent1"));
- System.err.println(" " + errors.getString("InvalidPercent2"));
- System.err.println(" " + errors.getString("InvalidPercent3"));
- try { setPercent(0.50); } catch (IllegalArgumentException exc2) {}
- }
- }
-
- /**
- * 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 by the current lighten percentage.
- * @param x unused
- * @param y unused
- * @param rgb the rgb value to lighten
- * @return the lightened rgb value
- */
- public int filterRGB( int x, int y, int rgb )
- {
- DirectColorModel cm = (DirectColorModel)ColorModel.getRGBdefault();
-
- int alpha = cm.getAlpha(rgb);
- int red = cm.getRed(rgb);
- int green = cm.getGreen(rgb);
- int blue = cm.getBlue(rgb);
-
- red += (int)((255 - red) * percent );
- green += (int)((255 - green) * percent );
- blue += (int)((255 - blue) * percent );
-
- alpha = alpha << 24;
- red = red << 16;
- green = green << 8;
-
- return alpha | red | green | blue;
- }
-
- /**
- * The percentage to lighen when filtering.
- * @see #getPercent
- * @see #setPercent
- */
- protected double percent;
-
- /**
- * Error strings.
- */
- transient protected ResourceBundle errors;
- }
-