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/*
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 * Created on 10-jun-2004
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 *
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 * TODO To change the template for this generated file go to
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 * Window - Preferences - Java - Code Generation - Code and Comments
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 */
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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 *
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 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.
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 *
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 * For more information, contact:
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 *
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 *  Generalitat Valenciana
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 *   Conselleria d'Infraestructures i Transport
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 *   Av. Blasco Ib??ez, 50
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 *   46010 VALENCIA
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 *   SPAIN
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 *
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 *      +34 963862235
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 *   gvsig@gva.es
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 *      www.gvsig.gva.es
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 *
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 *    or
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 *
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 *   IVER T.I. S.A
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 *   Salamanca 50
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 *   46005 Valencia
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 *   Spain
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 *
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 *   +34 963163400
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 *   dac@iver.es
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 */
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package com.iver.cit.gvsig.fmap.core;
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import java.awt.geom.AffineTransform;
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import java.awt.geom.PathIterator;
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/*
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 * @(#)GeneralPathXIterator.java        1.21 03/01/23
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 *
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 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
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 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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 */
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/**
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 * This class represents the iterator for General Paths X.
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 * It can be used to retrieve all of the elements in a GeneralPathX.
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 * The {@link GeneralPathX#getPathIterator}
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 *  method is used to create a
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 * GeneralPathXIterator for a particular GeneralPathX.
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 * The iterator can be used to iterator the path only once.
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 * Subsequent iterations require a new iterator.
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 *
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 * @see GeneralPathX
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 *
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 * @version 10 Feb 1997
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 * @author        Jim Graham
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 */
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public class GeneralPathXIterator implements PathIterator {
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    int typeIdx = 0;
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    int pointIdx   = 0;
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    GeneralPathX path;
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    AffineTransform affine;
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    private static final int curvesize[] = {2, 2, 4, 6, 0};
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    /**
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     * Constructs an iterator given a GeneralPathX.
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     * @see GeneralPathX#getPathIterator
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     */
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    GeneralPathXIterator(GeneralPathX path) {
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        this(path, null);
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    }
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    /**
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     * Constructs an iterator given a GeneralPathX and an optional
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     * AffineTransform.
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     * @see GeneralPathX#getPathIterator
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     */
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    GeneralPathXIterator(GeneralPathX path, AffineTransform at) {
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        this.path = path;
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        this.affine = at;
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    }
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    /**
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     * Return the winding rule for determining the interior of the
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     * path.
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     * @see PathIterator#WIND_EVEN_ODD
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     * @see PathIterator#WIND_NON_ZERO
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     */
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    public int getWindingRule() {
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        return path.getWindingRule();
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    }
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    /**
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     * Tests if there are more points to read.
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     * @return true if there are more points to read
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     */
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    public boolean isDone() {
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        return (typeIdx >= path.numTypes);
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    }
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    /**
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     * Moves the iterator to the next segment of the path forwards
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     * along the primary direction of traversal as long as there are
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     * more points in that direction.
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     */
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    public void next() {
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        int type = path.pointTypes[typeIdx++];
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        pointIdx += curvesize[type];
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    }
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    /**
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     * Returns the coordinates and type of the current path segment in
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     * the iteration.
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     * The return value is the path segment type:
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     * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
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     * A float array of length 6 must be passed in and may be used to
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     * store the coordinates of the point(s).
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     * Each point is stored as a pair of float x,y coordinates.
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     * SEG_MOVETO and SEG_LINETO types will return one point,
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     * SEG_QUADTO will return two points,
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     * SEG_CUBICTO will return 3 points
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     * and SEG_CLOSE will not return any points.
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     * @see PathIterator#SEG_MOVETO
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     * @see PathIterator#SEG_LINETO
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     * @see PathIterator#SEG_QUADTO
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     * @see PathIterator#SEG_CUBICTO
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     * @see PathIterator#SEG_CLOSE
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     */
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    public int currentSegment(float[] coords) {
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        int type = path.pointTypes[typeIdx];
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        int numCoords = curvesize[type];
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        if (numCoords > 0 && affine != null) {
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            affine.transform(path.pointCoords, pointIdx,
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                             coords, 0,
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                             numCoords / 2);
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        } else {
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            for (int i=0; i < numCoords; i++) {
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                        coords[i] = (float) path.pointCoords[pointIdx + i];
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                    }
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        }
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        return type;
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    }
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    /**
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     * Returns the coordinates and type of the current path segment in
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     * the iteration.
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     * The return value is the path segment type:
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     * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
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     * A double array of length 6 must be passed in and may be used to
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     * store the coordinates of the point(s).
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     * Each point is stored as a pair of double x,y coordinates.
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     * SEG_MOVETO and SEG_LINETO types will return one point,
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     * SEG_QUADTO will return two points,
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     * SEG_CUBICTO will return 3 points
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     * and SEG_CLOSE will not return any points.
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     * @see PathIterator#SEG_MOVETO
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     * @see PathIterator#SEG_LINETO
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     * @see PathIterator#SEG_QUADTO
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     * @see PathIterator#SEG_CUBICTO
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     * @see PathIterator#SEG_CLOSE
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     */
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    public int currentSegment(double[] coords) {
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        int type = path.pointTypes[typeIdx];
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        int numCoords = curvesize[type];
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        if (numCoords > 0 && affine != null) {
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            affine.transform(path.pointCoords, pointIdx,
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                             coords, 0,
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                             numCoords / 2);
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        } else {
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            System.arraycopy(path.pointCoords, pointIdx, coords, 0, numCoords);
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        }
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        return type;
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    }
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}