Package jjil.algorithm.j2se

Source Code of jjil.algorithm.j2se.Gray8Rect

/*
* Gray8Rect.java
*
* Created on September 9, 2006, 2:52 PM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*
* Copyright 2007 by Jon A. Webb
*     This program is free software: you can redistribute it and/or modify
*    it under the terms of the GNU Lesser General Public License as published by
*    the Free Software Foundation, either version 3 of the License, or
*    (at your option) any later version.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU Lesser General Public License for more details.
*
*    You should have received a copy of the Lesser GNU General Public License
*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
*/

package jjil.algorithm.j2se;
import java.awt.Rectangle;

import jjil.algorithm.ErrorCodes;
import jjil.core.Error;
import jjil.core.Gray8Image;
import jjil.core.Image;
import jjil.core.PipelineStage;

/**
* Pipeline stage assigns a constant value to a rectangle in an input Gray8Image
* to produce an output Gray8Image.
* @author webb
*/
public class Gray8Rect extends PipelineStage {
    private int cX, cY, nWidth, nHeight;
    private byte bValue;
   
    /**
     * Creates a new instance of Gray8Rect.
     * @param cX The horizontal offset of the rectangle.
     * @param cY the vertical offset of the rectangle.
     * @param nWidth the width of the rectangle.
     * @param nHeight the height of the rectangle.
     * @param bValue the value to be assigned to the rectangle.
     * @throws jjil.core.Error if the height or width of the rectangle is negative or zero.
     */
    public Gray8Rect(int cX, int cY, int nWidth, int nHeight, byte bValue)
      throws jjil.core.Error {
      setWindow(cX, cY, nWidth, nHeight);
        this.bValue = bValue;
    }
   
    /**
     * Creates an instance of Gray8Rect which will fill the given Rect with
     * the given value
     * @param r the Rect to fill
     * @param bValue the byte value to assign
     * @throws jjil.core.Error if the rectangle has zero or negative width or
     * height
     */
    public Gray8Rect(Rectangle r, byte bValue) throws jjil.core.Error {
        setWindow((int)r.getMinY(), (int)r.getMinX(), (int)r.getWidth(), (int)r.getHeight());
        this.bValue = bValue;
    }
       
    /**
     * Assigns a constant rectangle to the input Gray8Image, replacing values in the image.
     * @param image the input image (output replaces input).
     * @throws jjil.core.Error if the input is not a Gray8Image.
     */
    public void push(Image image) throws jjil.core.Error {
        if (!(image instanceof Gray8Image)) {
            throw new Error(
                    Error.PACKAGE.ALGORITHM,
                    ErrorCodes.IMAGE_NOT_GRAY8IMAGE,
                    image.toString(),
                    null,
                    null);
        }
        Gray8Image input = (Gray8Image) image;
        byte[] data = input.getData();
        int nLimitY = Math.min(input.getHeight(), this.cY + this.nHeight);
        int nLimitX = Math.min(input.getWidth(), this.cX + this.nWidth);
        for (int i=this.cY; i<nLimitY; i++) {
            int nStart = i * image.getWidth();
            for (int j=this.cX; j<nLimitX; j++) {
                data[nStart+j] = this.bValue;
            }
        }
         super.setOutput(input);
    }
   
    /**
     *
     * @param cX Top-left horizontal coordinate of the rectangle.
     * @param cY top-left vertical coordinate of the rectangle.
     * @param nWidth Width of the rectangle.
     * @param nHeight Height of the rectangle.
     * @throws jjil.core.Error if the width or height is negative or zero.
     */
    public void setWindow(int cX, int cY, int nWidth, int nHeight)
      throws jjil.core.Error {
      if (nWidth <= 0 || nHeight <= 0) {
            throw new Error(
                Error.PACKAGE.ALGORITHM,
                ErrorCodes.OUTPUT_IMAGE_SIZE_NEGATIVE,
                new Integer(nWidth).toString(),
                new Integer(nHeight).toString(),
                null);
      }
        this.cX = cX;
        this.cY = cY;
        this.nWidth = nWidth;
        this.nHeight = nHeight;
    }
}
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