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 curveTo ('C' or 'c') 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 SvgPathCurveToCmd extends SvgPathCmd
036{
037   private Point2D.Float mSecondControlPoint;
038
039   //---------------------------------------------------------------------------
040   public SvgPathCurveToCmd()
041   {
042      super('C');
043   }
044
045   //---------------------------------------------------------------------------
046   protected SvgPathCurveToCmd(char inCmdChar)
047   {
048      super(inCmdChar);
049   }
050
051
052   //---------------------------------------------------------------------------
053   @Override
054   public SvgPathCurveToCmd setRawNumbers(List<Float> inValue)
055   {
056      if (inValue.size()%6 != 0)
057      {
058         throw new SvgPathDataException("6 numbers per command must be given to a curveTo path command!");
059      }
060
061      setNumSteps(inValue.size()/6);
062
063      super.setRawNumbers(inValue);
064      return this;
065   }
066
067
068   //--------------------------------------------------------------------------
069   public Point2D.Float getSecondControlPoint()
070   {
071      return mSecondControlPoint;
072   }
073
074   //--------------------------------------------------------------------------
075   protected void setSecondControlPoint(Point2D.Float inValue)
076   {
077      mSecondControlPoint = inValue;
078   }
079
080   //--------------------------------------------------------------------------
081   // From http://www.w3.org/TR/SVG/paths.html
082   //
083   // Draws a cubic Bézier curve from the current point to (x,y) using (x1,y1) as the control point at the beginning of
084   // the curve and (x2,y2) as the control point at the end of the curve. C (uppercase) indicates that absolute coordinates
085   // will follow; c (lowercase) indicates that relative coordinates will follow. Multiple sets of coordinates may be
086   // specified to draw a polybézier. At the end of the command, the new current point becomes the final (x,y) coordinate
087   // pair used in the polybézier.
088   public Point2D.Float draw(Path2D.Float inPolyline)
089   {
090      List<Float> rawNumbers = getRawNumbers();
091      int numIndex = 0;
092
093      Point2D.Float currentPoint = getStartingPoint();
094
095      while (numIndex < rawNumbers.size() - 1)
096      {
097         Point2D.Float point1 = new Point2D.Float(rawNumbers.get(numIndex++), rawNumbers.get(numIndex++));
098         Point2D.Float point2 = new Point2D.Float(rawNumbers.get(numIndex++), rawNumbers.get(numIndex++));
099         Point2D.Float point3 = new Point2D.Float(rawNumbers.get(numIndex++), rawNumbers.get(numIndex++));
100
101         if (isRelative())
102         {
103            point1.setLocation(point1.getX() + currentPoint.getX(), point1.getY() + currentPoint.getY());
104            point2.setLocation(point2.getX() + currentPoint.getX(), point2.getY() + currentPoint.getY());
105            point3.setLocation(point3.getX() + currentPoint.getX(), point3.getY() + currentPoint.getY());
106         }
107
108         inPolyline.curveTo(point1.getX(), point1.getY(), point2.getX(), point2.getY(), point3.getX(), point3.getY());
109
110         setSecondControlPoint(point2);
111
112         currentPoint = point3;
113      }
114
115      // Return the last point.
116      return currentPoint;
117   }
118}