QuiltFilter.java

/*
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.Rectangle;
import java.util.Date;
import java.util.Random;

public class QuiltFilter extends WholeImageFilter {

	private final Random randomGenerator;
	private long seed = 567;
	private int iterations = 25000;
	private float a = -0.59f;
	private float b = 0.2f;
	private float c = 0.1f;
	private float d = 0;
	private int k = 0;
	private Colormap colormap = new LinearColormap();

	public QuiltFilter() {
		randomGenerator = new Random();
	}

	public void randomize() {
		seed = new Date().getTime();
		randomGenerator.setSeed(seed);
		a = randomGenerator.nextFloat();
		b = randomGenerator.nextFloat();
		c = randomGenerator.nextFloat();
		d = randomGenerator.nextFloat();
		k = randomGenerator.nextInt() % 20 - 10;
	}
	
	/**
	 * Set the number of iterations the effect is performed.
	 * @param iterations the number of iterations
     * @min-value 0
     * @see #getIterations
	 */
	public void setIterations(int iterations) {
		this.iterations = iterations;
	}

	/**
	 * Get the number of iterations the effect is performed.
	 * @return the number of iterations
     * @see #setIterations
	 */
	public int getIterations() {
		return iterations;
	}

	public void setA(float a) {
		this.a = a;
	}

	public float getA() {
		return a;
	}

	public void setB(float b) {
		this.b = b;
	}

	public float getB() {
		return b;
	}

	public void setC(float c) {
		this.c = c;
	}

	public float getC() {
		return c;
	}

	public void setD(float d) {
		this.d = d;
	}

	public float getD() {
		return d;
	}

	public void setK(int k) {
		this.k = k;
	}

	public int getK() {
		return k;
	}

    /**
     * Set the colormap to be used for the filter.
     * @param colormap the colormap
     * @see #getColormap
     */
	public void setColormap(Colormap colormap) {
		this.colormap = colormap;
	}
	
    /**
     * Get the colormap to be used for the filter.
     * @return the colormap
     * @see #setColormap
     */
	public Colormap getColormap() {
		return colormap;
	}
	
        @Override
	protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) {
		int[] outPixels = new int[width * height];

		int i = 0;
		int max = 0;

		float x = 0.1f;
		float y = 0.3f;
		
		for (int n = 0; n < 20; n++) {
			float mx = ImageMath.PI*x;
			float my = ImageMath.PI*y;
			float smx2 = (float)Math.sin(2*mx);
			float smy2 = (float)Math.sin(2*my);
			float x1 = (float)(a*smx2 + b*smx2*Math.cos(2*my) +
				c*Math.sin(4*mx) + d*Math.sin(6*mx)*Math.cos(4*my) + k*x);
			x1 = x1 >= 0 ? x1 - x1 : x1 - x1 + 1;

			float y1 = (float)(a*smy2 + b*smy2*Math.cos(2*mx) +
				c*Math.sin(4*my) + d*Math.sin(6*my)*Math.cos(4*mx) + k*y);
			y1 = y1 >= 0 ? y1 - y1 : y1 - y1 + 1;
			x = x1;
			y = y1;
		}

		for (int n = 0; n < iterations; n++) {
			float mx = ImageMath.PI*x;
			float my = ImageMath.PI*y;
			float x1 = (float)(a*Math.sin(2*mx) + b*Math.sin(2*mx)*Math.cos(2*my) +
				c*Math.sin(4*mx) + d*Math.sin(6*mx)*Math.cos(4*my) + k*x);
			x1 = x1 >= 0 ? x1 - x1 : x1 - x1 + 1;

			float y1 = (float)(a*Math.sin(2*my) + b*Math.sin(2*my)*Math.cos(2*mx) +
				c*Math.sin(4*my) + d*Math.sin(6*my)*Math.cos(4*mx) + k*y);
			y1 = y1 >= 0 ? y1 - y1 : y1 - y1 + 1;
			x = x1;
			y = y1;
			int ix = (int)(width*x);
			int iy = (int)(height*y);
			if (ix >= 0 && ix < width && iy >= 0 && iy < height) {
				int t = outPixels[width*iy+ix]++;
				if (t > max) {
                                    max = t;
                                }
			}
		}

		if (colormap != null) {
			int index = 0;
			for (y = 0; y < height; y++) {
				for (x = 0; x < width; x++) {
					outPixels[index] = colormap.getColor(outPixels[index] / (float)max);
					index++;
				}
			}
		}
		return outPixels;
	}

        @Override
	public String toString() {
		return "Texture/Chaotic Quilt...";
	}

    @Override
    public Object clone() throws CloneNotSupportedException {
        return super.clone(); //To change body of generated methods, choose Tools | Templates.
    }
	
}