com.vividsolutions.jts.awt.PolygonShape Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of JTSplus Show documentation
JTS Topology Suite 1.14 with additional functions for GeoSpark
There is a newer version: 0.1.4
/*
 * The JTS Topology Suite is a collection of Java classes that
 * implement the fundamental operations required to validate a given
 * geo-spatial data set to a known topological specification.
 *
 * Copyright (C) 2001 Vivid Solutions
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * For more information, contact:
 *
 *     Vivid Solutions
 *     Suite #1A
 *     2328 Government Street
 *     Victoria BC  V8T 5G5
 *     Canada
 *
 *     (250)385-6040
 *     www.vividsolutions.com
 */
package com.vividsolutions.jts.awt;

import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import java.awt.geom.PathIterator;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.Collection;
import java.util.Iterator;

import com.vividsolutions.jts.geom.Coordinate;

/**
 * A {@link Shape} which represents a polygon which may contain holes.
 * Provided because the standard AWT Polygon class does not support holes.
 * 
 * @author Martin Davis
 *
 */
public class PolygonShape implements Shape 
{
  // use a GeneralPath with a winding rule, since it supports floating point coordinates
    private GeneralPath polygonPath;
    private GeneralPath ringPath;
    
    /**
     * Creates a new polygon {@link Shape}.
     * 
     * @param shellVertices the vertices of the shell 
     * @param holeVerticesCollection a collection of Coordinate[] for each hole
     */
    public PolygonShape(Coordinate[] shellVertices,
        Collection holeVerticesCollection) 
    {
        polygonPath = toPath(shellVertices);

        for (Iterator i = holeVerticesCollection.iterator(); i.hasNext();) {
            Coordinate[] holeVertices = (Coordinate[]) i.next();
            polygonPath.append(toPath(holeVertices), false);
        }
    }

    public PolygonShape() 
    {
    }

    void addToRing(Point2D p)
    {
    	if (ringPath == null) {
    		ringPath = new GeneralPath(GeneralPath.WIND_EVEN_ODD);
    		ringPath.moveTo((float) p.getX(), (float) p.getY());
    	}
    	else {
    		ringPath.lineTo((float) p.getX(), (float) p.getY());
    	}
    }
    
    void endRing()
    {
      ringPath.closePath();
    	if (polygonPath == null) {
    		polygonPath = ringPath;
    	}
    	else {
    		polygonPath.append(ringPath, false);
    	}
    	ringPath = null;
    }
    
    /**
     * Creates a GeneralPath representing a polygon ring 
     * having the given coordinate sequence.
     * Uses the GeneralPath.WIND_EVEN_ODD winding rule.
     * 
     * @param coordinates a coordinate sequence
     * @return the path for the coordinate sequence
     */
    private GeneralPath toPath(Coordinate[] coordinates) {
      GeneralPath path = new GeneralPath(GeneralPath.WIND_EVEN_ODD, coordinates.length);

      if (coordinates.length > 0) {
        path.moveTo((float) coordinates[0].x, (float) coordinates[0].y);
        for (int i = 0; i < coordinates.length; i++) {
          path.lineTo((float) coordinates[i].x, (float) coordinates[i].y);
        }
      }
      return path;
  }

    public Rectangle getBounds() {
      return polygonPath.getBounds();
    }

    public Rectangle2D getBounds2D() {
        return polygonPath.getBounds2D();
    }

    public boolean contains(double x, double y) {
      return polygonPath.contains(x, y);
    }

    public boolean contains(Point2D p) {
      return polygonPath.contains(p);
    }

    public boolean intersects(double x, double y, double w, double h) {
      return polygonPath.intersects(x, y, w, h);
    }

    public boolean intersects(Rectangle2D r) {
      return polygonPath.intersects(r);
    }

    public boolean contains(double x, double y, double w, double h) {
      return polygonPath.contains(x, y, w, h);
    }

    public boolean contains(Rectangle2D r) {
      return polygonPath.contains(r);
    }

    public PathIterator getPathIterator(AffineTransform at) {
        return polygonPath.getPathIterator(at);
    }

    public PathIterator getPathIterator(AffineTransform at, double flatness) {
    	return getPathIterator(at, flatness);
    }
}