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/*
Copyright 2006 Jerry Huxtable
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.
*/
package com.jhlabs.image;
import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
public class ShadowFilter extends AbstractBufferedImageOp {
static final long serialVersionUID = 6310370419462785691L;
private float radius = 5;
private float angle = (float)Math.PI*6/4;
private float distance = 5;
private float opacity = 0.5f;
private boolean addMargins = false;
private boolean shadowOnly = false;
private int shadowColor = 0xff000000;
public ShadowFilter() {
}
public ShadowFilter(float radius, float xOffset, float yOffset, float opacity) {
this.radius = radius;
this.angle = (float)Math.atan2(yOffset, xOffset);
this.distance = (float)Math.sqrt(xOffset*xOffset + yOffset*yOffset);
this.opacity = opacity;
}
public void setAngle(float angle) {
this.angle = angle;
}
public float getAngle() {
return angle;
}
public void setDistance(float distance) {
this.distance = distance;
}
public float getDistance() {
return distance;
}
/**
* Set the radius of the kernel, and hence the amount of blur. The bigger the radius, the longer this filter will take.
* @param radius the radius of the blur in pixels.
*/
public void setRadius(float radius) {
this.radius = radius;
}
/**
* Get the radius of the kernel.
* @return the radius
*/
public float getRadius() {
return radius;
}
public void setOpacity(float opacity) {
this.opacity = opacity;
}
public float getOpacity() {
return opacity;
}
public void setShadowColor(int shadowColor) {
this.shadowColor = shadowColor;
}
public int getShadowColor() {
return shadowColor;
}
public void setAddMargins(boolean addMargins) {
this.addMargins = addMargins;
}
public boolean getAddMargins() {
return addMargins;
}
public void setShadowOnly(boolean shadowOnly) {
this.shadowOnly = shadowOnly;
}
public boolean getShadowOnly() {
return shadowOnly;
}
protected void transformSpace(Rectangle r) {
if ( addMargins ) {
float xOffset = distance*(float)Math.cos(angle);
float yOffset = -distance*(float)Math.sin(angle);
r.width += (int)(Math.abs(xOffset)+2*radius);
r.height += (int)(Math.abs(yOffset)+2*radius);
}
}
public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
int width = src.getWidth();
int height = src.getHeight();
if ( dst == null ) {
if ( addMargins ) {
ColorModel cm = src.getColorModel();
dst = new BufferedImage(cm, cm.createCompatibleWritableRaster(src.getWidth(), src.getHeight()), cm.isAlphaPremultiplied(), null);
} else
dst = createCompatibleDestImage( src, null );
}
float shadowR = ((shadowColor >> 16) & 0xff) / 255f;
float shadowG = ((shadowColor >> 8) & 0xff) / 255f;
float shadowB = (shadowColor & 0xff) / 255f;
// Make a black mask from the image's alpha channel
float[][] extractAlpha = {
{ 0, 0, 0, shadowR },
{ 0, 0, 0, shadowG },
{ 0, 0, 0, shadowB },
{ 0, 0, 0, opacity }
};
BufferedImage shadow = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
new BandCombineOp( extractAlpha, null ).filter( src.getRaster(), shadow.getRaster() );
shadow = new GaussianFilter( radius ).filter( shadow, null );
float xOffset = distance*(float)Math.cos(angle);
float yOffset = -distance*(float)Math.sin(angle);
Graphics2D g = dst.createGraphics();
g.setComposite( AlphaComposite.getInstance( AlphaComposite.SRC_OVER, opacity ) );
if ( addMargins ) {
float radius2 = radius/2;
float topShadow = Math.max( 0, radius-yOffset );
float leftShadow = Math.max( 0, radius-xOffset );
g.translate( topShadow, leftShadow );
}
g.drawRenderedImage( shadow, AffineTransform.getTranslateInstance( xOffset, yOffset ) );
if ( !shadowOnly ) {
g.setComposite( AlphaComposite.SrcOver );
g.drawRenderedImage( src, null );
}
g.dispose();
return dst;
}
public String toString() {
return "Stylize/Drop Shadow...";
}
}
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