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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.*;
/**
* A Filter which produces the effect of looking into a kaleidoscope.
*/
public class KaleidoscopeFilter extends TransformFilter {
private float angle = 0;
private float angle2 = 0;
private float centreX = 0.5f;
private float centreY = 0.5f;
private int sides = 3;
private float radius = 0;
private float icentreX;
private float icentreY;
/**
* Construct a KaleidoscopeFilter with no distortion.
*/
public KaleidoscopeFilter() {
setEdgeAction( CLAMP );
}
public void setSides(int sides) {
this.sides = sides;
}
public int getSides() {
return sides;
}
public void setAngle(float angle) {
this.angle = angle;
}
public float getAngle() {
return angle;
}
public void setAngle2(float angle2) {
this.angle2 = angle2;
}
public float getAngle2() {
return angle2;
}
public void setCentreX( float centreX ) {
this.centreX = centreX;
}
public float getCentreX() {
return centreX;
}
public void setCentreY( float centreY ) {
this.centreY = centreY;
}
public float getCentreY() {
return centreY;
}
public void setCentre( Point2D centre ) {
this.centreX = (float)centre.getX();
this.centreY = (float)centre.getY();
}
public Point2D getCentre() {
return new Point2D.Float( centreX, centreY );
}
public void setRadius( float radius ) {
this.radius = radius;
}
public float getRadius() {
return radius;
}
public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
icentreX = src.getWidth() * centreX;
icentreY = src.getHeight() * centreY;
return super.filter( src, dst );
}
protected void transformInverse(int x, int y, float[] out) {
double dx = x-icentreX;
double dy = y-icentreY;
double r = Math.sqrt( dx*dx + dy*dy );
double theta = Math.atan2( dy, dx ) - angle - angle2;
theta = ImageMath.triangle( (float)( theta/Math.PI*sides*.5 ) );
if ( radius != 0 ) {
double c = Math.cos(theta);
double radiusc = radius/c;
r = radiusc * ImageMath.triangle( (float)(r/radiusc) );
}
theta += angle;
out[0] = (float)(icentreX + r*Math.cos(theta));
out[1] = (float)(icentreY + r*Math.sin(theta));
}
public String toString() {
return "Distort/Kaleidoscope...";
}
}
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