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/* 
 *  Copyright (c) 2011, Michael Bedward. All rights reserved. 
 *   
 *  Redistribution and use in source and binary forms, with or without modification, 
 *  are permitted provided that the following conditions are met: 
 *   
 *  - Redistributions of source code must retain the above copyright notice, this  
 *    list of conditions and the following disclaimer. 
 *   
 *  - Redistributions in binary form must reproduce the above copyright notice, this 
 *    list of conditions and the following disclaimer in the documentation and/or 
 *    other materials provided with the distribution.   
 *   
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR 
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */   
package org.jaitools.imageutils.shape;


import java.awt.geom.AffineTransform;



import com.vividsolutions.jts.geom.Point;


/**
 * A path iterator for the LiteShape class, specialized to iterate over Point objects.
 * This class was ported back and simplified from GeoTools, with permission from the author(s)
 *
 * @author Andrea Aime
 */
public final class PointIterator extends AbstractLiteIterator {
    /** Transform applied on the coordinates during iteration */
    private AffineTransform at;
    
    /** The point we are going to provide when asked for coordinates */
    private Point point;
    
    /** True when the point has been read once */
    private boolean done;
    

    /**
     * Creates a new PointIterator object.
     *
     * @param point The point
     * @param at The affine transform applied to coordinates during iteration
     */
    public PointIterator(Point point, AffineTransform at) {
        if (at == null) {
            at = new AffineTransform();
        }
        
        this.at = at;
        this.point = point;
        done = false;
    }

    /**
     * Return the winding rule for determining the interior of the path.
     *
     * @return WIND_EVEN_ODD by default.
     */
    public int getWindingRule() {
        return WIND_EVEN_ODD;
    }

    /**
     * @see java.awt.geom.PathIterator#next()
     */
    public void next() {
        done = true;
    }

    /**
     * @see java.awt.geom.PathIterator#isDone()
     */
    public boolean isDone() {
        return done;
    }

    /**
     * @see java.awt.geom.PathIterator#currentSegment(double[])
     */
    public int currentSegment(double[] coords) {
        coords[0] = point.getX();
        coords[1] = point.getY();
        at.transform(coords, 0, coords, 0, 1);

        return SEG_MOVETO;
    }

}