/*
* 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.shape;
import com.vividsolutions.jts.geom.*;
public abstract class GeometricShapeBuilder
{
protected Envelope extent = new Envelope(0, 1, 0, 1);
protected int numPts = 0;
protected GeometryFactory geomFactory;
public GeometricShapeBuilder(GeometryFactory geomFactory)
{
this.geomFactory = geomFactory;
}
public void setExtent(Envelope extent)
{
this.extent = extent;
}
public Envelope getExtent()
{
return extent;
}
public Coordinate getCentre()
{
return extent.centre();
}
public double getDiameter()
{
return Math.min(extent.getHeight(), extent.getWidth());
}
public double getRadius()
{
return getDiameter() / 2;
}
public LineSegment getSquareBaseLine()
{
double radius = getRadius();
Coordinate centre = getCentre();
Coordinate p0 = new Coordinate(centre.x - radius, centre.y - radius);
Coordinate p1 = new Coordinate(centre.x + radius, centre.y - radius);
return new LineSegment(p0, p1);
}
public Envelope getSquareExtent()
{
double radius = getRadius();
Coordinate centre = getCentre();
return new Envelope(centre.x - radius, centre.x + radius,
centre.y - radius, centre.y + radius);
}
/**
* Sets the total number of points in the created {@link Geometry}.
* The created geometry will have no more than this number of points,
* unless more are needed to create a valid geometry.
*/
public void setNumPoints(int numPts) { this.numPts = numPts; }
public abstract Geometry getGeometry();
protected Coordinate createCoord(double x, double y)
{
Coordinate pt = new Coordinate(x, y);
geomFactory.getPrecisionModel().makePrecise(pt);
return pt;
}
}