using System;
using System.Drawing;
using System.util;
/*
 * $Id: LineSegment.cs 158 2010-04-18 20:31:15Z psoares33 $
 *
 * This file is part of the iText project.
 * Copyright (c) 1998-2012 1T3XT BVBA
 * Authors: Bruno Lowagie, Kevin Day, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * This program 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * you must retain the producer line in every PDF that is created or manipulated
 * using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
namespace iTextSharp.text.pdf.parser {

    /**
     * Represents a line segment in a particular coordinate system.  This class is immutable.
     * @since 5.0.2
     */
    public class LineSegment {

        /** Start vector of the segment. */
        private Vector startPoint;
        /** End vector of the segment. */
        private Vector endPoint;
        
        /**
         * Creates a new line segment.
         * @param startPoint the start point of a line segment.
         * @param endPoint the end point of a line segment.
         */
        public LineSegment(Vector startPoint, Vector endPoint) {
            this.startPoint = startPoint;
            this.endPoint = endPoint;
        }

        /**
         * @return the start point
         */
        public Vector GetStartPoint() {
            return startPoint;
        }

        /**
         * @return the end point
         */
        public Vector GetEndPoint() {
            return endPoint;
        }
        
        /**
         * @return the length of this line segment
         * @since 5.0.2
         */
        public float GetLength(){
            return endPoint.Subtract(startPoint).Length;
        }
        
        /**
         * Computes the bounding rectangle for this line segment.  The rectangle has a rotation 0 degrees
         * with respect to the coordinate system that the line system is in.  For example, if a line segment
         * is 5 unit long and sits at a 37 degree angle from horizontal, the bounding rectangle will have
         * origin of the lower left hand end point of the segment, with width = 4 and height = 3. 
         * @return the bounding rectangle
         * @since 5.0.2
         */
        public RectangleJ GetBoundingRectange(){
            float x1 = GetStartPoint()[Vector.I1];
            float y1 = GetStartPoint()[Vector.I2];
            float x2 = GetEndPoint()[Vector.I1];
            float y2 = GetEndPoint()[Vector.I2];
            return new RectangleJ(Math.Min(x1, x2), Math.Min(y1, y2), Math.Abs(x2-x1), Math.Abs(y2-y1));
        }

        
        /**
         * Transforms the segment by the specified matrix
         * @param m the matrix for the transformation
         * @return the transformed segment
         */
        public LineSegment TransformBy(Matrix m){
            Vector newStart = startPoint.Cross(m);
            Vector newEnd = endPoint.Cross(m);
            return new LineSegment(newStart, newEnd);
        }
    }
}