polylineshape.java

处理PDF

/*
 * $Id: PolylineShape.java 3117 2008-01-31 05:53:22Z xlv $
 *
 * Copyright 2007 Bruno Lowagie and Wil
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

package com.lowagie.text.pdf.internal;

import java.awt.Shape;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.geom.PathIterator;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

/**
 * Class that defines a Polyline shape.
 * This class was originally written by wil - amristar.com.au
 * and integrated into iText by Bruno.
 */
public class PolylineShape implements Shape {
	/** All the X-values of the coordinates in the polyline. */
	protected int[] x;
	/** All the Y-values of the coordinates in the polyline. */
	protected int[] y;
	/** The total number of points. */
	protected int np;

	/** Creates a PolylineShape. */
	public PolylineShape(int[] x, int[] y, int nPoints) {
		// Should copy array (as done in Polygon)
		this.np = nPoints;
		// Take a copy.
		this.x = new int[np];
		this.y = new int[np];
		System.arraycopy(x, 0, this.x, 0, np);
		System.arraycopy(y, 0, this.y, 0, np);
	}

	/**
	 * Returns the bounding box of this polyline.
	 *
	 * @return a {@link Rectangle2D} that is the high-precision
	 * 	bounding box of this line.
	 * @see java.awt.Shape#getBounds2D()
	 */
	public Rectangle2D getBounds2D() {
		int[] r = rect();
		return r==null?null:new Rectangle2D.Double(r[0], r[1], r[2], r[3]);
	}
	
	/**
	 * Returns the bounding box of this polyline.
	 * @see java.awt.Shape#getBounds()
	 */
	public Rectangle getBounds() {
		return getBounds2D().getBounds();
	}

	/**
	 * Calculates the origin (X, Y) and the width and height
	 * of a rectangle that contains all the segments of the
	 * polyline.
	 */
	private int[] rect() {
		 if(np==0)return null;
		int xMin = x[0], yMin=y[0], xMax=x[0],yMax=y[0];

		 for(int i=1;i<np;i++) {
			 if(x[i]<xMin)xMin=x[i];
			 else if(x[i]>xMax)xMax=x[i];
			 if(y[i]<yMin)yMin=y[i];
			 else if(y[i]>yMax)yMax=y[i];
		 }

		 return new int[] { xMin, yMin, xMax-xMin, yMax-yMin };
	}

	/**
	 * A polyline can't contain a point.
	 * @see java.awt.Shape#contains(double, double)
	 */
	public boolean contains(double x, double y) { return false; }
	
	/**
	 * A polyline can't contain a point.
	 * @see java.awt.Shape#contains(java.awt.geom.Point2D)
	 */
	public boolean contains(Point2D p) { return false; }
	
	/**
	 * A polyline can't contain a point.
	 * @see java.awt.Shape#contains(double, double, double, double)
	 */
	public boolean contains(double x, double y, double w, double h) { return false; }
	
	/**
	 * A polyline can't contain a point.
	 * @see java.awt.Shape#contains(java.awt.geom.Rectangle2D)
	 */
	public boolean contains(Rectangle2D r) { return false; }

	/**
	 * Checks if one of the lines in the polyline intersects
	 * with a given rectangle.
	 * @see java.awt.Shape#intersects(double, double, double, double)
	 */
	public boolean intersects(double x, double y, double w, double h) {
		return intersects(new Rectangle2D.Double(x, y, w, h));
	}

	/**
	 * Checks if one of the lines in the polyline intersects
	 * with a given rectangle.
	 * @see java.awt.Shape#intersects(java.awt.geom.Rectangle2D)
	 */
	public boolean intersects(Rectangle2D r) {
		if(np==0)return false;
		Line2D line = new Line2D.Double(x[0],y[0],x[0],y[0]);
		for (int i = 1; i < np; i++) {
			line.setLine(x[i-1], y[i-1], x[i], y[i]);
			if(line.intersects(r))return true;
		}
		return false;
	}

	/**
	 * Returns an iteration object that defines the boundary of the polyline.
	 * @param at the specified {@link AffineTransform}
	 * @return a {@link PathIterator} that defines the boundary of this polyline.
	 * @see java.awt.Shape#intersects(java.awt.geom.Rectangle2D)
	 */
	public PathIterator getPathIterator(AffineTransform at) {
		return new PolylineShapeIterator(this, at);
	}

	/**
	 * There's no difference with getPathIterator(AffineTransform at);
	 * we just need this method to implement the Shape interface.
	 */
	public PathIterator getPathIterator(AffineTransform at, double flatness) {
		return new PolylineShapeIterator(this, at);
	}

}