/*
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 org.meteoinfo.image.filter;

public class WeaveFilter extends PointFilter {

	private float xWidth = 16;
	private float yWidth = 16;
	private float xGap = 6;
	private float yGap = 6;
	private int rows = 4;
	private int cols = 4;
	private int rgbX = 0xffff8080;
	private int rgbY = 0xff8080ff;
	private boolean useImageColors = true;
	private boolean roundThreads = false;
	private boolean shadeCrossings = true;

	public int[][] matrix = {
		{ 0, 1, 0, 1 },
		{ 1, 0, 1, 0 },
		{ 0, 1, 0, 1 },
		{ 1, 0, 1, 0 },
	};
	
	public WeaveFilter() {
	}
	
	public void setXGap(float xGap) {
		this.xGap = xGap;
	}

	public void setXWidth(float xWidth) {
		this.xWidth = xWidth;
	}

	public float getXWidth() {
		return xWidth;
	}

	public void setYWidth(float yWidth) {
		this.yWidth = yWidth;
	}

	public float getYWidth() {
		return yWidth;
	}

	public float getXGap() {
		return xGap;
	}

	public void setYGap(float yGap) {
		this.yGap = yGap;
	}

	public float getYGap() {
		return yGap;
	}

	public void setCrossings(int[][] matrix) {
		this.matrix = matrix;
	}
	
	public int[][] getCrossings() {
		return matrix;
	}
	
	public void setUseImageColors(boolean useImageColors) {
		this.useImageColors = useImageColors;
	}

	public boolean getUseImageColors() {
		return useImageColors;
	}

	public void setRoundThreads(boolean roundThreads) {
		this.roundThreads = roundThreads;
	}

	public boolean getRoundThreads() {
		return roundThreads;
	}

	public void setShadeCrossings(boolean shadeCrossings) {
		this.shadeCrossings = shadeCrossings;
	}

	public boolean getShadeCrossings() {
		return shadeCrossings;
	}

	public int filterRGB(int x, int y, int rgb) {
		x += xWidth+xGap/2;
		y += yWidth+yGap/2;
		float nx = ImageMath.mod(x, xWidth+xGap);
		float ny = ImageMath.mod(y, yWidth+yGap);
		int ix = (int)(x / (xWidth+xGap));
		int iy = (int)(y / (yWidth+yGap));
		boolean inX = nx < xWidth;
		boolean inY = ny < yWidth;
		float dX, dY;
		float cX, cY;
		int lrgbX, lrgbY;

		if (roundThreads) {
			dX = Math.abs(xWidth/2-nx) / xWidth / 2;
			dY = Math.abs(yWidth/2-ny) / yWidth / 2;
		} else {
			dX = dY = 0;
		}

		if (shadeCrossings) {
			cX = ImageMath.smoothStep(xWidth/2, xWidth/2+xGap, Math.abs(xWidth/2-nx));
			cY = ImageMath.smoothStep(yWidth/2, yWidth/2+yGap, Math.abs(yWidth/2-ny));
		} else {
			cX = cY = 0;
		}

		if (useImageColors) {
			lrgbX = lrgbY = rgb;
		} else {
			lrgbX = rgbX;
			lrgbY = rgbY;
		}
		int v;
		int ixc = ix % cols;
		int iyr = iy % rows;
		int m = matrix[iyr][ixc];
		if (inX) {
			if (inY) {
				v = m == 1 ? lrgbX : lrgbY;
				v = ImageMath.mixColors(2 * (m == 1 ? dX : dY), v, 0xff000000);
			} else {
				if (shadeCrossings) {
					if (m != matrix[(iy+1) % rows][ixc]) {
						if (m == 0)
							cY = 1-cY;
						cY *= 0.5f;
						lrgbX = ImageMath.mixColors(cY, lrgbX, 0xff000000);
					} else if (m == 0)
						lrgbX = ImageMath.mixColors(0.5f, lrgbX, 0xff000000);
				}
				v = ImageMath.mixColors(2 * dX, lrgbX, 0xff000000);
			}
		} else if (inY) {
			if (shadeCrossings) {
				if (m != matrix[iyr][(ix+1) % cols]) {
					if (m == 1)
						cX = 1-cX;
					cX *= 0.5f;
					lrgbY = ImageMath.mixColors(cX, lrgbY, 0xff000000);
				} else if (m == 1)
					lrgbY = ImageMath.mixColors(0.5f, lrgbY, 0xff000000);
			}
			v = ImageMath.mixColors(2 * dY, lrgbY, 0xff000000);
		} else
			v = 0x00000000;
		return v;
	}

	public String toString() {
		return "Texture/Weave...";
	}

}


