001package com.hfg.svg.path;
002
003import java.awt.geom.GeneralPath;
004import java.awt.geom.Path2D;
005import java.awt.geom.Point2D;
006import java.util.List;
007                        
008//------------------------------------------------------------------------------
009/**
010 * Object representation of an SVG (Scalable Vector Graphics) path lineTo ('L' or 'l') command.
011 *
012 * @author J. Alex Taylor, hairyfatguy.com
013 */
014//------------------------------------------------------------------------------
015// com.hfg XML/HTML Coding Library
016//
017// This library is free software; you can redistribute it and/or
018// modify it under the terms of the GNU Lesser General Public
019// License as published by the Free Software Foundation; either
020// version 2.1 of the License, or (at your option) any later version.
021//
022// This library is distributed in the hope that it will be useful,
023// but WITHOUT ANY WARRANTY; without even the implied warranty of
024// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
025// Lesser General Public License for more details.
026//
027// You should have received a copy of the GNU Lesser General Public
028// License along with this library; if not, write to the Free Software
029// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
030//
031// J. Alex Taylor, President, Founder, CEO, COO, CFO, OOPS hairyfatguy.com
032// jataylor@hairyfatguy.com
033//------------------------------------------------------------------------------
034               
035public class SvgPathLineToCmd extends SvgPathCmd
036{
037
038   //---------------------------------------------------------------------------
039   public SvgPathLineToCmd()
040   {
041      super('L');
042   }
043
044
045   //---------------------------------------------------------------------------
046   @Override
047   public SvgPathLineToCmd setRawNumbers(List<Float> inValue)
048   {
049      if (inValue.size()%2 != 0)
050      {
051         throw new SvgPathDataException("An even number of numbers must be given to a lineTo path command!");
052      }
053
054      setNumSteps(inValue.size()/2);
055
056      super.setRawNumbers(inValue);
057      return this;
058   }
059
060
061   //--------------------------------------------------------------------------
062   // From http://www.w3.org/TR/SVG/paths.html
063   //
064   // Draw a line from the current point to the given (x,y) coordinate which becomes the new current point.
065   // L (uppercase) indicates that absolute coordinates will follow; l (lowercase) indicates that relative coordinates will follow.
066   // A number of coordinates pairs may be specified to draw a polyline. At the end of the command, the new current point is set
067   // to the final set of coordinates provided.
068   public Point2D.Float draw(Path2D.Float inPolyline)
069   {
070      List<Float> rawNumbers = getRawNumbers();
071      int numIndex = 0;
072
073      Point2D.Float currentPoint = getStartingPoint();
074
075      while (numIndex < rawNumbers.size() - 1)
076      {
077         Point2D.Float point = new Point2D.Float(rawNumbers.get(numIndex++), rawNumbers.get(numIndex++));
078
079         if (isRelative())
080         {
081            point.setLocation(point.getX() + currentPoint.getX(), point.getY() + currentPoint.getY());
082         }
083
084         inPolyline.lineTo(point.getX(), point.getY());
085
086         currentPoint = point;
087      }
088
089      // Return the last point.
090      return currentPoint;
091   }
092}