001: /*
002: * $Id: PolylineShapeIterator.java 2772 2007-05-21 14:06:08Z blowagie $
003: *
004: * Copyright 2007 Bruno Lowagie and Wil
005: *
006: * The contents of this file are subject to the Mozilla Public License Version 1.1
007: * (the "License"); you may not use this file except in compliance with the License.
008: * You may obtain a copy of the License at http://www.mozilla.org/MPL/
009: *
010: * Software distributed under the License is distributed on an "AS IS" basis,
011: * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
012: * for the specific language governing rights and limitations under the License.
013: *
014: * The Original Code is 'iText, a free JAVA-PDF library'.
015: *
016: * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
017: * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
018: * All Rights Reserved.
019: * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
020: * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
021: *
022: * Contributor(s): all the names of the contributors are added in the source code
023: * where applicable.
024: *
025: * Alternatively, the contents of this file may be used under the terms of the
026: * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
027: * provisions of LGPL are applicable instead of those above. If you wish to
028: * allow use of your version of this file only under the terms of the LGPL
029: * License and not to allow others to use your version of this file under
030: * the MPL, indicate your decision by deleting the provisions above and
031: * replace them with the notice and other provisions required by the LGPL.
032: * If you do not delete the provisions above, a recipient may use your version
033: * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
034: *
035: * This library is free software; you can redistribute it and/or modify it
036: * under the terms of the MPL as stated above or under the terms of the GNU
037: * Library General Public License as published by the Free Software Foundation;
038: * either version 2 of the License, or any later version.
039: *
040: * This library is distributed in the hope that it will be useful, but WITHOUT
041: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
042: * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
043: * details.
044: *
045: * If you didn't download this code from the following link, you should check if
046: * you aren't using an obsolete version:
047: * http://www.lowagie.com/iText/
048: */
049:
050: package com.lowagie.text.pdf.internal;
051:
052: import java.awt.geom.AffineTransform;
053: import java.awt.geom.PathIterator;
054: import java.util.NoSuchElementException;
055:
056: /**
057: * PathIterator for PolylineShape.
058: * This class was originally written by wil - amristar.com.au
059: * and integrated into iText by Bruno.
060: */
061: public class PolylineShapeIterator implements PathIterator {
062: /** The polyline over which we are going to iterate. */
063: protected PolylineShape poly;
064: /** an affine transformation to be performed on the polyline. */
065: protected AffineTransform affine;
066: /** the index of the current segment in the iterator. */
067: protected int index;
068:
069: /** Creates a PolylineShapeIterator. */
070: PolylineShapeIterator(PolylineShape l, AffineTransform at) {
071: this .poly = l;
072: this .affine = at;
073: }
074:
075: /**
076: * Returns the coordinates and type of the current path segment in
077: * the iteration. The return value is the path segment type:
078: * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
079: * A double array of length 6 must be passed in and may be used to
080: * store the coordinates of the point(s).
081: * Each point is stored as a pair of double x,y coordinates.
082: * SEG_MOVETO and SEG_LINETO types will return one point,
083: * SEG_QUADTO will return two points,
084: * SEG_CUBICTO will return 3 points
085: * and SEG_CLOSE will not return any points.
086: * @see #SEG_MOVETO
087: * @see #SEG_LINETO
088: * @see #SEG_QUADTO
089: * @see #SEG_CUBICTO
090: * @see #SEG_CLOSE
091: * @see java.awt.geom.PathIterator#currentSegment(double[])
092: */
093: public int currentSegment(double[] coords) {
094: if (isDone()) {
095: throw new NoSuchElementException(
096: "line iterator out of bounds");
097: }
098: int type = (index == 0) ? SEG_MOVETO : SEG_LINETO;
099: coords[0] = (double) poly.x[index];
100: coords[1] = (double) poly.y[index];
101: if (affine != null) {
102: affine.transform(coords, 0, coords, 0, 1);
103: }
104: return type;
105: }
106:
107: /**
108: * Returns the coordinates and type of the current path segment in
109: * the iteration. The return value is the path segment type:
110: * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
111: * A double array of length 6 must be passed in and may be used to
112: * store the coordinates of the point(s).
113: * Each point is stored as a pair of double x,y coordinates.
114: * SEG_MOVETO and SEG_LINETO types will return one point,
115: * SEG_QUADTO will return two points,
116: * SEG_CUBICTO will return 3 points
117: * and SEG_CLOSE will not return any points.
118: * @see #SEG_MOVETO
119: * @see #SEG_LINETO
120: * @see #SEG_QUADTO
121: * @see #SEG_CUBICTO
122: * @see #SEG_CLOSE
123: * @see java.awt.geom.PathIterator#currentSegment(float[])
124: */
125: public int currentSegment(float[] coords) {
126: if (isDone()) {
127: throw new NoSuchElementException(
128: "line iterator out of bounds");
129: }
130: int type = (index == 0) ? SEG_MOVETO : SEG_LINETO;
131: coords[0] = (float) poly.x[index];
132: coords[1] = (float) poly.y[index];
133: if (affine != null) {
134: affine.transform(coords, 0, coords, 0, 1);
135: }
136: return type;
137: }
138:
139: /**
140: * Return the winding rule for determining the insideness of the
141: * path.
142: * @see #WIND_EVEN_ODD
143: * @see #WIND_NON_ZERO
144: * @see java.awt.geom.PathIterator#getWindingRule()
145: */
146: public int getWindingRule() {
147: return WIND_NON_ZERO;
148: }
149:
150: /**
151: * Tests if there are more points to read.
152: * @return true if there are more points to read
153: * @see java.awt.geom.PathIterator#isDone()
154: */
155: public boolean isDone() {
156: return (index >= poly.np);
157: }
158:
159: /**
160: * Moves the iterator to the next segment of the path forwards
161: * along the primary direction of traversal as long as there are
162: * more points in that direction.
163: * @see java.awt.geom.PathIterator#next()
164: */
165: public void next() {
166: index++;
167: }
168:
169: }
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