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Viewing changes to src/org/openscience/cdk/renderer/ArrowRenderer2D.java

  • Committer: Bazaar Package Importer
  • Author(s): Paul Cager
  • Date: 2008-04-09 21:17:53 UTC
  • Revision ID: james.westby@ubuntu.com-20080409211753-46lmjw5z8mx5pd8d
Tags: upstream-1.0.2
Import upstream version 1.0.2

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src/org/openscience/cdk/renderer/ArrowRenderer2D.java
 
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/* $Revision: 7636 $ $Author: egonw $ $Date: 2007-01-04 18:46:10 +0100 (Thu, 04 Jan 2007) $
 
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 *  
 
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 * Copyright (C) 2006-2007  Christoph Steinbeck <steinbeck@users.sf.net>
 
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 *
 
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 * Contact: cdk-devel@lists.sourceforge.net
 
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 *
 
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 * This program is free software; you can redistribute it and/or
 
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 * modify it under the terms of the GNU Lesser General Public License
 
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 * as published by the Free Software Foundation; either version 2.1
 
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 * of the License, or (at your option) any later version.
 
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 * All we ask is that proper credit is given for our work, which includes
 
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 * - but is not limited to - adding the above copyright notice to the beginning
 
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 * of your source code files, and to any copyright notice that you may distribute
 
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 * with programs based on this work.
 
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 *
 
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 * This program is distributed in the hope that it will be useful,
 
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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 * GNU Lesser General Public License for more details.
 
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 *
 
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 * You should have received a copy of the GNU Lesser General Public License
 
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 * along with this program; if not, write to the Free Software
 
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 
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 */
 
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package org.openscience.cdk.renderer;
 
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import org.openscience.cdk.geometry.GeometryTools;
 
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import org.openscience.cdk.interfaces.IAtom;
 
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import org.openscience.cdk.interfaces.IAtomContainer;
 
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import org.openscience.cdk.tools.LoggingTool;
 
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import javax.vecmath.Point2d;
 
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import javax.vecmath.Vector2d;
 
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import java.awt.*;
 
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import java.awt.geom.Arc2D;
 
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import java.awt.geom.Ellipse2D;
 
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/**
 
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 * A Renderer class which draws 2D representations of curly arrows as used for
 
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 * representing electron movements in organic chemistry text books.
 
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 * Adapted from <a href="http://www.wam.umd.edu/~petersd/Interp2_code.java">http://www.wam.umd.edu/~petersd/Interp2_code.java</a>.
 
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 * 
 
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 * @author      steinbeck
 
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 * @cdk.module  render
 
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 * @cdk.created 2006-03-28
 
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 * @cdk.keyword viewer, 2D-viewer
 
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 * @see         org.openscience.cdk.renderer.Renderer2DModel
 
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 */
 
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public class ArrowRenderer2D {
 
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        Renderer2DModel r2dm;
 
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        protected LoggingTool logger;
 
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        double rotAngle; 
 
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        double offsetAngle;
 
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        Point2d center; 
 
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        Vector2d vector3;
 
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        //private Vector points = new Vector(16, 4);
 
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        //private int precision = 10;
 
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        /**
 
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         * Constructs a ArrowRenderer2D with a default settings model.
 
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         */
 
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        public ArrowRenderer2D() {
 
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                this(new Renderer2DModel());
 
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        }
 
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        /**
 
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         * Constructs a ArrowRenderer2D.
 
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         * 
 
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         * @param r2dm
 
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         *            The settings model to use for renderingraphics.
 
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         */
 
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        public ArrowRenderer2D(Renderer2DModel r2dm) {
 
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                this.r2dm = r2dm;
 
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                logger = new LoggingTool(this);
 
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        }
 
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        /**
 
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         */
 
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        public void paintArrows(Arrow[] arrows, Graphics2D graphics) 
 
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        {
 
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                for (int f = 0; f < arrows.length; f++)
 
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                {
 
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                        paintArrow(arrows[f], graphics);
 
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                }
 
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        }
 
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        void paintArrow(Arrow arrow, Graphics2D graphics)
 
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        {
 
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                Dimension ss = r2dm.getBackgroundDimension();
 
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                Arc2D.Double arc = contructArc(arrow);
 
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                graphics.draw(arc);
 
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                Polygon polygon = contructArrowHead(arc);
 
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                graphics.fill(polygon);
 
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                graphics.draw(contructArrowHead(arc));
 
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                graphics.draw(new Ellipse2D.Double(center.x, ss.getHeight() - center.y, 10,10));
 
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        }
 
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        public Arc2D.Double contructArc(Arrow arrow)
 
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        {
 
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                Dimension ss = r2dm.getBackgroundDimension();
 
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                IAtom start = arrow.getStart();
 
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                IAtom end = arrow.getEnd();
 
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                Arc2D.Double arc = new Arc2D.Double();
 
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                IAtomContainer atomContainer = start.getBuilder().newAtomContainer();
 
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                atomContainer.addAtom(start);
 
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                atomContainer.addAtom(end);
 
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                center = GeometryTools.get2DCenter(atomContainer,r2dm.getRenderingCoordinates());
 
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                Point2d point1 = new Point2d((Point2d)r2dm.getRenderingCoordinate(start));
 
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                Point2d point2 = new Point2d((Point2d)r2dm.getRenderingCoordinate(end));
 
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                Vector2d vector1 = new Vector2d(point1);
 
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                Vector2d vector2 = new Vector2d(point2);
 
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                vector2.sub(vector1);
 
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                rotAngle = GeometryTools.getAngle(vector2.x, vector2.y);
 
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                offsetAngle = rotAngle + (Math.PI/2);
 
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                vector3 = new Vector2d(Math.cos(offsetAngle), Math.sin(offsetAngle));
 
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                vector3.normalize();
 
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                vector3.scale(20);
 
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                center.add(vector3);
 
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                logger.debug("rotAngle: ", rotAngle * 360 / (Math.PI * 2));
 
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                logger.debug("offsetAngle: ", offsetAngle * 360 / (Math.PI * 2));
 
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                arc.setArcByCenter(center.x, ss.height - center.y, point1.distance(point2)/2,(rotAngle* 360 / (Math.PI * 2)),180,Arc2D.OPEN );
 
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                return arc;
 
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        }
 
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        public Polygon contructArrowHead(Arc2D.Double arc)
 
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        {
 
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                Polygon polygon = new Polygon();
 
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                double wingOffset = (Math.PI/18); 
 
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                Vector2d vector2 = new Vector2d(Math.cos(offsetAngle - wingOffset ), Math.sin(offsetAngle - wingOffset));
 
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                Vector2d vector3 = new Vector2d(Math.cos(offsetAngle + wingOffset), Math.sin(offsetAngle + wingOffset ));
 
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                Point2d point2 = new Point2d(arc.getStartPoint().getX(), arc.getStartPoint().getY());
 
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                Point2d point3 = new Point2d(arc.getStartPoint().getX(), arc.getStartPoint().getY());
 
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                vector2.normalize();
 
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                vector2.scale(10);
 
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                vector3.normalize();
 
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                vector3.scale(10);
 
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                //Dimension ss = r2dm.getBackgroundDimension();
 
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                point2.add(vector2);
 
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                point3.add(vector3);
 
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                polygon.addPoint((int)arc.getStartPoint().getX(), (int)arc.getStartPoint().getY());
 
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                polygon.addPoint((int)point2.x, (int)point2.y);
 
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                polygon.addPoint((int)point3.x, (int)point3.y);
 
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                return polygon;
 
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        }
 
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}