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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.*;
import com.jhlabs.math.*;
public class WaterFilter extends TransformFilter {
static final long serialVersionUID = 8789236343162990941L;
private float wavelength = 16;
private float amplitude = 10;
private float phase = 0;
private float centreX = 0.5f;
private float centreY = 0.5f;
private float radius = 50;
private float radius2 = 0;
private float icentreX;
private float icentreY;
public WaterFilter() {
setEdgeAction( CLAMP );
}
public void setWavelength(float wavelength) {
this.wavelength = wavelength;
}
public float getWavelength() {
return wavelength;
}
public void setAmplitude(float amplitude) {
this.amplitude = amplitude;
}
public float getAmplitude() {
return amplitude;
}
public void setPhase(float phase) {
this.phase = phase;
}
public float getPhase() {
return phase;
}
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;
}
private boolean inside(int v, int a, int b) {
return a <= v && v <= b;
}
public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
icentreX = src.getWidth() * centreX;
icentreY = src.getHeight() * centreY;
if ( radius == 0 )
radius = Math.min(icentreX, icentreY);
radius2 = radius*radius;
return super.filter( src, dst );
}
protected void transformInverse(int x, int y, float[] out) {
float dx = x-icentreX;
float dy = y-icentreY;
float distance2 = dx*dx + dy*dy;
if (distance2 > radius2) {
out[0] = x;
out[1] = y;
} else {
float distance = (float)Math.sqrt(distance2);
float amount = amplitude * (float)Math.sin(distance / wavelength * ImageMath.TWO_PI - phase);
amount *= (radius-distance)/radius;
if ( distance != 0 )
amount *= wavelength/distance;
out[0] = x + dx*amount;
out[1] = y + dy*amount;
}
}
public String toString() {
return "Distort/Water Ripples...";
}
}
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