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/*

 * Created on 10-jun-2004

 *

 * TODO To change the template for this generated file go to

 * Window - Preferences - Java - Code Generation - Code and Comments

 */

package com.iver.cit.gvsig.fmap.fshape;

/**

 * @author FJP

 *

 * TODO To change the template for this generated type comment go to

 * Window - Preferences - Java - Code Generation - Code and Comments

 */

/*

 * @(#)GeneralPathX.java        1.58 03/01/23

 *

 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.

 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.

 */

import java.awt.Shape;

import java.awt.geom.AffineTransform;

import java.awt.geom.FlatteningPathIterator;

import java.awt.geom.IllegalPathStateException;

import java.awt.geom.PathIterator;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import sun.awt.geom.Crossings;

import sun.awt.geom.Curve;

/**

 * The <code>GeneralPathX</code> class represents a geometric path

 * constructed from straight lines, and quadratic and cubic

 * (Bézier) curves.  It can contain multiple subpaths.

 * <p>

 * The winding rule specifies how the interior of a path is

 * determined.  There are two types of winding rules:

 * EVEN_ODD and NON_ZERO.

 * <p>

 * An EVEN_ODD winding rule means that enclosed regions

 * of the path alternate between interior and exterior areas as

 * traversed from the outside of the path towards a point inside

 * the region.

 * <p>

 * A NON_ZERO winding rule means that if a ray is

 * drawn in any direction from a given point to infinity

 * and the places where the path intersects

 * the ray are examined, the point is inside of the path if and only if

 * the number of times that the path crosses the ray from

 * left to right does not equal the  number of times that the path crosses

 * the ray from right to left.

 * @version 1.58, 01/23/03

 * @author Jim Graham

 */

public final class GeneralPathX implements Shape, Cloneable {

    /**

     * An even-odd winding rule for determining the interior of

     * a path.

     */

    public static final int WIND_EVEN_ODD = PathIterator.WIND_EVEN_ODD;

    /**

     * A non-zero winding rule for determining the interior of a

     * path.

     */

    public static final int WIND_NON_ZERO = PathIterator.WIND_NON_ZERO;

    // For code simplicity, copy these constants to our namespace

    // and cast them to byte constants for easy storage.

    private static final byte SEG_MOVETO  = (byte) PathIterator.SEG_MOVETO;

    private static final byte SEG_LINETO  = (byte) PathIterator.SEG_LINETO;

    private static final byte SEG_QUADTO  = (byte) PathIterator.SEG_QUADTO;

    private static final byte SEG_CUBICTO = (byte) PathIterator.SEG_CUBICTO;

    private static final byte SEG_CLOSE   = (byte) PathIterator.SEG_CLOSE;

    byte[] pointTypes;

    double[] pointCoords;

    int numTypes;

    int numCoords;

    int windingRule;

    static final int INIT_SIZE = 20;

    static final int EXPAND_MAX = 500;

    /**

     * Constructs a new <code>GeneralPathX</code> object.

     * If an operation performed on this path requires the

     * interior of the path to be defined then the default NON_ZERO

     * winding rule is used.

     * @see #WIND_NON_ZERO

     */

    public GeneralPathX() {

        this(WIND_NON_ZERO, INIT_SIZE, INIT_SIZE);

    }

    /**

     * Constructs a new <code>GeneralPathX</code> object with the specified

     * winding rule to control operations that require the interior of the

     * path to be defined.

     * @param rule the winding rule

     * @see #WIND_EVEN_ODD

     * @see #WIND_NON_ZERO

     */

    public GeneralPathX(int rule) {

        this(rule, INIT_SIZE, INIT_SIZE);

    }

    /**

     * Constructs a new <code>GeneralPathX</code> object with the specified

     * winding rule and the specified initial capacity to store path

     * coordinates. This number is an initial guess as to how many path

     * segments are in the path, but the storage is expanded

     * as needed to store whatever path segments are added to this path.

     * @param rule the winding rule

     * @param initialCapacity the estimate for the number of path segments

     * in the path

     * @see #WIND_EVEN_ODD

     * @see #WIND_NON_ZERO

     */

    public GeneralPathX(int rule, int initialCapacity) {

        this(rule, initialCapacity, initialCapacity);

    }

    /**

     * Constructs a new <code>GeneralPathX</code> object with the specified

     * winding rule and the specified initial capacities to store point types

     * and coordinates.

     * These numbers are an initial guess as to how many path segments

     * and how many points are to be in the path, but the

     * storage is expanded as needed to store whatever path segments are

     * added to this path.

     * @param rule the winding rule

     * @param initialTypes the estimate for the number of path segments

     * in the path

     * @param initialCapacity the estimate for the number of points

     * @see #WIND_EVEN_ODD

     * @see #WIND_NON_ZERO

     */

    GeneralPathX(int rule, int initialTypes, int initialCoords) {

        setWindingRule(rule);

        pointTypes = new byte[initialTypes];

        pointCoords = new double[initialCoords * 2];

    }

    /**

     * Constructs a new <code>GeneralPathX</code> object from an arbitrary

     * {@link Shape} object.

     * All of the initial geometry and the winding rule for this path are

     * taken from the specified <code>Shape</code> object.

     * @param s the specified <code>Shape</code> object

     */

    public GeneralPathX(Shape s) {

        this(WIND_NON_ZERO, INIT_SIZE, INIT_SIZE);

        PathIterator pi = s.getPathIterator(null);

        setWindingRule(pi.getWindingRule());

        append(pi, false);

    }

    private void needRoom(int newTypes, int newCoords, boolean needMove) {

        if (needMove && numTypes == 0) {

            throw new IllegalPathStateException("missing initial moveto "+

                                                "in path definition");

        }

        int size = pointCoords.length;

        if (numCoords + newCoords > size) {

            int grow = size;

            if (grow > EXPAND_MAX * 2) {

                grow = EXPAND_MAX * 2;

            }

            if (grow < newCoords) {

                grow = newCoords;

            }

            double[] arr = new double[size + grow];

            System.arraycopy(pointCoords, 0, arr, 0, numCoords);

            pointCoords = arr;

        }

        size = pointTypes.length;

        if (numTypes + newTypes > size) {

            int grow = size;

            if (grow > EXPAND_MAX) {

                grow = EXPAND_MAX;

            }

            if (grow < newTypes) {

                grow = newTypes;

            }

            byte[] arr = new byte[size + grow];

            System.arraycopy(pointTypes, 0, arr, 0, numTypes);

            pointTypes = arr;

        }

    }

    /**

     * Adds a point to the path by moving to the specified

     * coordinates.

     * @param x, y the specified coordinates

     */

    public synchronized void moveTo(double x, double y) {

        if (numTypes > 0 && pointTypes[numTypes - 1] == SEG_MOVETO) {

            pointCoords[numCoords - 2] = x;

            pointCoords[numCoords - 1] = y;

        } else {

            needRoom(1, 2, false);

            pointTypes[numTypes++] = SEG_MOVETO;

            pointCoords[numCoords++] = x;

            pointCoords[numCoords++] = y;

        }

    }

    /**

     * Adds a point to the path by drawing a straight line from the

     * current coordinates to the new specified coordinates.

     * @param x, y the specified coordinates

     */

    public synchronized void lineTo(double x, double y) {

        needRoom(1, 2, true);

        pointTypes[numTypes++] = SEG_LINETO;

        pointCoords[numCoords++] = x;

        pointCoords[numCoords++] = y;

    }

    /**

     * Adds a curved segment, defined by two new points, to the path by

     * drawing a Quadratic curve that intersects both the current

     * coordinates and the coordinates (x2, y2), using the

     * specified point (x1, y1) as a quadratic parametric control

     * point.

     * @param x1, y1 the coordinates of the first quadratic control

     *                point

     * @param x2, y2 the coordinates of the final endpoint

     */

    public synchronized void quadTo(double x1, double y1, double x2, double y2) {

        needRoom(1, 4, true);

        pointTypes[numTypes++] = SEG_QUADTO;

        pointCoords[numCoords++] = x1;

        pointCoords[numCoords++] = y1;

        pointCoords[numCoords++] = x2;

        pointCoords[numCoords++] = y2;

    }

    /**

     * Adds a curved segment, defined by three new points, to the path by

     * drawing a Bézier curve that intersects both the current

     * coordinates and the coordinates (x3, y3), using the

     * specified points (x1, y1) and (x2, y2) as

     * Bézier control points.

     * @param x1, y1 the coordinates of the first Béezier

     *                control point

     * @param x2, y2 the coordinates of the second Bézier

     *                control point

     * @param x3, y3 the coordinates of the final endpoint

     */

    public synchronized void curveTo(double x1, double y1,

                    double x2, double y2,

                    double x3, double y3) {

        needRoom(1, 6, true);

        pointTypes[numTypes++] = SEG_CUBICTO;

        pointCoords[numCoords++] = x1;

        pointCoords[numCoords++] = y1;

        pointCoords[numCoords++] = x2;

        pointCoords[numCoords++] = y2;

        pointCoords[numCoords++] = x3;

        pointCoords[numCoords++] = y3;

    }

    /**

     * Closes the current subpath by drawing a straight line back to

     * the coordinates of the last <code>moveTo</code>.  If the path is already

     * closed then this method has no effect.

     */

    public synchronized void closePath() {

        if (numTypes == 0 || pointTypes[numTypes - 1] != SEG_CLOSE) {

            needRoom(1, 0, true);

            pointTypes[numTypes++] = SEG_CLOSE;

        }

    }

    /**

     * Appends the geometry of the specified <code>Shape</code> object to the

     * path, possibly connecting the new geometry to the existing path

     * segments with a line segment.

     * If the <code>connect</code> parameter is <code>true</code> and the

     * path is not empty then any initial <code>moveTo</code> in the

     * geometry of the appended <code>Shape</code>

     * is turned into a <code>lineTo</code> segment.

     * If the destination coordinates of such a connecting <code>lineTo</code>

     * segment match the ending coordinates of a currently open

     * subpath then the segment is omitted as superfluous.

     * The winding rule of the specified <code>Shape</code> is ignored

     * and the appended geometry is governed by the winding

     * rule specified for this path.

     * @param s the <code>Shape</code> whose geometry is appended

     * to this path

     * @param connect a boolean to control whether or not to turn an

     * initial <code>moveTo</code> segment into a <code>lineTo</code>

     * segment to connect the new geometry to the existing path

     */

    public void append(Shape s, boolean connect) {

        PathIterator pi = s.getPathIterator(null);

        append(pi,connect);

    }

    /**

     * Appends the geometry of the specified

     * {@link PathIterator} object

     * to the path, possibly connecting the new geometry to the existing

     * path segments with a line segment.

     * If the <code>connect</code> parameter is <code>true</code> and the

     * path is not empty then any initial <code>moveTo</code> in the

     * geometry of the appended <code>Shape</code> is turned into a

     * <code>lineTo</code> segment.

     * If the destination coordinates of such a connecting <code>lineTo</code>

     * segment match the ending coordinates of a currently open

     * subpath then the segment is omitted as superfluous.

     * The winding rule of the specified <code>Shape</code> is ignored

     * and the appended geometry is governed by the winding

     * rule specified for this path.

     * @param pi the <code>PathIterator</code> whose geometry is appended to

     * this path

     * @param connect a boolean to control whether or not to turn an

     * initial <code>moveTo</code> segment into a <code>lineTo</code> segment

     * to connect the new geometry to the existing path

     */

    public void append(PathIterator pi, boolean connect) {

        double coords[] = new double[6];

        while (!pi.isDone()) {

            switch (pi.currentSegment(coords)) {

            case SEG_MOVETO:

                if (!connect || numTypes < 1 || numCoords < 2) {

                    moveTo(coords[0], coords[1]);

                    break;

                }

                if (pointTypes[numTypes - 1] != SEG_CLOSE &&

                    pointCoords[numCoords - 2] == coords[0] &&

                    pointCoords[numCoords - 1] == coords[1])

                {

                    // Collapse out initial moveto/lineto

                    break;

                }

                // NO BREAK;

            case SEG_LINETO:

                lineTo(coords[0], coords[1]);

                break;

            case SEG_QUADTO:

                quadTo(coords[0], coords[1],

                       coords[2], coords[3]);

                break;

            case SEG_CUBICTO:

                curveTo(coords[0], coords[1],

                        coords[2], coords[3],

                        coords[4], coords[5]);

                break;

            case SEG_CLOSE:

                closePath();

                break;

            }

            pi.next();

            connect = false;

        }

    }

    /**

     * Returns the fill style winding rule.

     * @return an integer representing the current winding rule.

     * @see #WIND_EVEN_ODD

     * @see #WIND_NON_ZERO

     * @see #setWindingRule

     */

    public synchronized int getWindingRule() {

        return windingRule;

    }

    /**

     * Sets the winding rule for this path to the specified value.

     * @param rule an integer representing the specified

     * winding rule

     * @exception <code>IllegalArgumentException</code> if

     *                <code>rule</code> is not either

     *                <code>WIND_EVEN_ODD</code> or

     *                <code>WIND_NON_ZERO</code>

     * @see #WIND_EVEN_ODD

     * @see #WIND_NON_ZERO

     * @see #getWindingRule

     */

    public void setWindingRule(int rule) {

        if (rule != WIND_EVEN_ODD && rule != WIND_NON_ZERO) {

            throw new IllegalArgumentException("winding rule must be "+

                                               "WIND_EVEN_ODD or "+

                                               "WIND_NON_ZERO");

        }

        windingRule = rule;

    }

    /**

     * Returns the coordinates most recently added to the end of the path

     * as a {@link Point2D} object.

     * @return a <code>Point2D</code> object containing the ending

     * coordinates of the path or <code>null</code> if there are no points

     * in the path.

     */

    public synchronized Point2D getCurrentPoint() {

        if (numTypes < 1 || numCoords < 2) {

            return null;

        }

        int index = numCoords;

        if (pointTypes[numTypes - 1] == SEG_CLOSE) {

        loop:

            for (int i = numTypes - 2; i > 0; i--) {

                switch (pointTypes[i]) {

                case SEG_MOVETO:

                    break loop;

                case SEG_LINETO:

                    index -= 2;

                    break;

                case SEG_QUADTO:

                    index -= 4;

                    break;

                case SEG_CUBICTO:

                    index -= 6;

                    break;

                case SEG_CLOSE:

                    break;

                }

            }

        }

        return new Point2D.Double(pointCoords[index - 2],

                                 pointCoords[index - 1]);

    }

    /**

     * Resets the path to empty.  The append position is set back to the

     * beginning of the path and all coordinates and point types are

     * forgotten.

     */

    public synchronized void reset() {

        numTypes = numCoords = 0;

    }

    /**

     * Transforms the geometry of this path using the specified

     * {@link AffineTransform}.

     * The geometry is transformed in place, which permanently changes the

     * boundary defined by this object.

     * @param at the <code>AffineTransform</code> used to transform the area

     */

    public void transform(AffineTransform at) {

        at.transform(pointCoords, 0, pointCoords, 0, numCoords / 2);

    }

    /**

     * Returns a new transformed <code>Shape</code>.

     * @param at the <code>AffineTransform</code> used to transform a

     * new <code>Shape</code>.

     * @return a new <code>Shape</code>, transformed with the specified

     * <code>AffineTransform</code>.

     */

    public synchronized Shape createTransformedShape(AffineTransform at) {

        GeneralPathX gp = (GeneralPathX) clone();

        if (at != null) {

            gp.transform(at);

        }

        return gp;

    }

    /**

     * Return the bounding box of the path.

     * @return a {@link java.awt.Rectangle} object that

     * bounds the current path.

     */

    public java.awt.Rectangle getBounds() {

        return getBounds2D().getBounds();

    }

    /**

     * Returns the bounding box of the path.

     * @return a {@link Rectangle2D} object that

     *          bounds the current path.

     */

    public synchronized Rectangle2D getBounds2D() {

        double x1, y1, x2, y2;

        int i = numCoords;

        if (i > 0) {

            y1 = y2 = pointCoords[--i];

            x1 = x2 = pointCoords[--i];

            while (i > 0) {

                double y = pointCoords[--i];

                double x = pointCoords[--i];

                if (x < x1) x1 = x;

                if (y < y1) y1 = y;

                if (x > x2) x2 = x;

                if (y > y2) y2 = y;

            }

        } else {

            x1 = y1 = x2 = y2 = 0.0f;

        }

        return new Rectangle2D.Double(x1, y1, x2 - x1, y2 - y1);

    }

    /**

     * Tests if the specified coordinates are inside the boundary of

     * this <code>Shape</code>.

     * @param x, y the specified coordinates

     * @return <code>true</code> if the specified coordinates are inside this

     * <code>Shape</code>; <code>false</code> otherwise

     */

    public boolean contains(double x, double y) {

        if (numTypes < 2) {

            return false;

        }

        int cross = Curve.crossingsForPath(getPathIterator(null), x, y);

        if (windingRule == WIND_NON_ZERO) {

            return (cross != 0);

        } else {

            return ((cross & 1) != 0);

        }

    }

    /**

     * Tests if the specified <code>Point2D</code> is inside the boundary

     * of this <code>Shape</code>.

     * @param p the specified <code>Point2D</code>

     * @return <code>true</code> if this <code>Shape</code> contains the

     * specified <code>Point2D</code>, <code>false</code> otherwise.

     */

    public boolean contains(Point2D p) {

        return contains(p.getX(), p.getY());

    }

    /**

     * Tests if the specified rectangular area is inside the boundary of

     * this <code>Shape</code>.

     * @param x, y the specified coordinates

     * @param w the width of the specified rectangular area

     * @param h the height of the specified rectangular area

     * @return <code>true</code> if this <code>Shape</code> contains

     * the specified rectangluar area; <code>false</code> otherwise.

     */

    public boolean contains(double x, double y, double w, double h) {

        Crossings c = Crossings.findCrossings(getPathIterator(null),

                                              x, y, x+w, y+h);

        return (c != null && c.covers(y, y+h));

    }

    /**

     * Tests if the specified <code>Rectangle2D</code>

     * is inside the boundary of this <code>Shape</code>.

     * @param r a specified <code>Rectangle2D</code>

     * @return <code>true</code> if this <code>Shape</code> bounds the

     * specified <code>Rectangle2D</code>; <code>false</code> otherwise.

     */

    public boolean contains(Rectangle2D r) {

        return contains(r.getX(), r.getY(), r.getWidth(), r.getHeight());

    }

    /**

     * Tests if the interior of this <code>Shape</code> intersects the

     * interior of a specified set of rectangular coordinates.

     * @param x, y the specified coordinates

     * @param w the width of the specified rectangular coordinates

     * @param h the height of the specified rectangular coordinates

     * @return <code>true</code> if this <code>Shape</code> and the

     * interior of the specified set of rectangular coordinates intersect

     * each other; <code>false</code> otherwise.

     */

    public boolean intersects(double x, double y, double w, double h) {

        Crossings c = Crossings.findCrossings(getPathIterator(null),

                                              x, y, x+w, y+h);

        return (c == null || !c.isEmpty());

    }

    /**

     * Tests if the interior of this <code>Shape</code> intersects the

     * interior of a specified <code>Rectangle2D</code>.

     * @param r the specified <code>Rectangle2D</code>

     * @return <code>true</code> if this <code>Shape</code> and the interior

     *                 of the specified <code>Rectangle2D</code> intersect each

     *                 other; <code>false</code> otherwise.

     */

    public boolean intersects(Rectangle2D r) {

        return intersects(r.getX(), r.getY(), r.getWidth(), r.getHeight());

    }

    /**

     * Returns a <code>PathIterator</code> object that iterates along the

     * boundary of this <code>Shape</code> and provides access to the

     * geometry of the outline of this <code>Shape</code>.

     * The iterator for this class is not multi-threaded safe,

     * which means that this <code>GeneralPathX</code> class does not

     * guarantee that modifications to the geometry of this

     * <code>GeneralPathX</code> object do not affect any iterations of

     * that geometry that are already in process.

     * @param at an <code>AffineTransform</code>

     * @return a new <code>PathIterator</code> that iterates along the

     * boundary of this <code>Shape</code> and provides access to the

     * geometry of this <code>Shape</code>'s outline

     */

    public PathIterator getPathIterator(AffineTransform at) {

        return new GeneralPathXIterator(this, at);

    }

    /**

     * Returns a <code>PathIterator</code> object that iterates along the

     * boundary of the flattened <code>Shape</code> and provides access to the

     * geometry of the outline of the <code>Shape</code>.

     * The iterator for this class is not multi-threaded safe,

     * which means that this <code>GeneralPathX</code> class does not

     * guarantee that modifications to the geometry of this

     * <code>GeneralPathX</code> object do not affect any iterations of

     * that geometry that are already in process.

     * @param at an <code>AffineTransform</code>

     * @param flatness the maximum distance that the line segments used to

     *                approximate the curved segments are allowed to deviate

     *                from any point on the original curve

     * @return a new <code>PathIterator</code> that iterates along the flattened

     * <code>Shape</code> boundary.

     */

    public PathIterator getPathIterator(AffineTransform at, double flatness) {

        return new FlatteningPathIterator(getPathIterator(at), flatness);

    }

    /**

     * Creates a new object of the same class as this object.

     *

     * @return     a clone of this instance.

     * @exception  OutOfMemoryError            if there is not enough memory.

     * @see        java.lang.Cloneable

     * @since      1.2

     */

    public Object clone() {

        try {

            GeneralPathX copy = (GeneralPathX) super.clone();

            copy.pointTypes = (byte[]) pointTypes.clone();

            copy.pointCoords = (double[]) pointCoords.clone();

            return copy;

        } catch (CloneNotSupportedException e) {

            // this shouldn't happen, since we are Cloneable

            throw new InternalError();

        }

    }

    GeneralPathX(int windingRule,

                byte[] pointTypes,

                int numTypes,

                double[] pointCoords,

                int numCoords) {

    // used to construct from native

        this.windingRule = windingRule;

        this.pointTypes = pointTypes;

        this.numTypes = numTypes;

        this.pointCoords = pointCoords;

        this.numCoords = numCoords;

    }

    public void flip()

        {

        byte[] pointTypesAux = new byte[numTypes];

        double[] pointCoordsAux = new double[numCoords];

        int i;

        for (i=0; i< numTypes; i++)

                pointTypesAux[numTypes - i -1] = pointTypes[i];

        int numPoints = numCoords/2;

        for (i=0; i< numPoints; i++)

        {

                // la x

                pointCoordsAux[2*(numPoints - i -1)] = pointCoords[2*i];

                // la y

                pointCoordsAux[2*(numPoints - i -1) + 1] = pointCoords[2*i + 1];

        }

        pointTypes = pointTypesAux;

        pointCoords = pointCoordsAux;

        }

}