svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.geometry / org.gvsig.fmap.geometry.impl / src / main / java / org / gvsig / fmap / geom / primitive / impl / Spline2D.java @ 40559
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2013 gvSIG Association.
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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 General Public License
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* as published by the Free Software Foundation; either version 3
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* of the License, or (at your option) any later version.
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU 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 Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.fmap.geom.primitive.impl; |
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import java.awt.geom.AffineTransform; |
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import java.awt.geom.Point2D; |
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import java.util.ArrayList; |
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import org.cresques.cts.IProjection; |
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import org.gvsig.fmap.geom.handler.AbstractHandler; |
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import org.gvsig.fmap.geom.handler.FinalHandler; |
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import org.gvsig.fmap.geom.handler.Handler; |
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import org.gvsig.fmap.geom.primitive.FShape; |
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import org.gvsig.fmap.geom.primitive.GeneralPathX; |
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import org.gvsig.fmap.geom.primitive.Point; |
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import org.gvsig.fmap.geom.primitive.Spline; |
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import org.gvsig.fmap.geom.type.GeometryType; |
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/**
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* Spline2D.
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*
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* @author Vicente Caballero Navarro
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*/
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public class Spline2D extends Curve2D implements Spline { |
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private static final long serialVersionUID = -8109393343595560984L; |
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private ArrayList points2d; |
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/**
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* The constructor with the GeometryType like and argument
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* is used by the {@link GeometryType}{@link #create()}
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* to create the geometry
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* @param type
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* The geometry type
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*/
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public Spline2D(GeometryType geometryType) {
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super(geometryType);
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points2d = new ArrayList(); |
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gp = new GeneralPathX();
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} |
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Spline2D(GeometryType geometryType, String id, IProjection projection, Point2D[] ps) { |
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super(geometryType, id, projection, getGeneralPathX(ps));
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for (int i=0 ; i<ps.length ; i++){ |
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points2d.add(ps[i]); |
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} |
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} |
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private static GeneralPathX getGeneralPathX(Point2D[] ps) { |
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GeneralPathX gpx=new GeneralPathX();
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int num=ps.length;
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double[] px=new double[num]; |
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double[] py=new double[num]; |
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for (int i=0;i<num;i++) { |
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Point2D p=ps[i];
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px[i]=p.getX(); |
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py[i]=p.getY(); |
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} |
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Spline splineX = new Spline(px);
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Spline splineY = new Spline(py);
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gpx.moveTo(px[0],py[0]); |
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for (int i = 0; i < px.length - 1; i++) { |
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for (int t = 1; t < 31; t++) { |
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double x1 = splineX.fn(i, ((double) t) / 30.0); |
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double y1 = splineY.fn(i, ((double) t) / 30.0); |
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gpx.lineTo(x1,y1); |
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} |
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} |
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if (ps[0].getX()==ps[ps.length-1].getX() && ps[0].getY()==ps[ps.length-1].getY()) |
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gpx.closePath(); |
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return gpx;
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} |
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private static GeneralPathX getGeneralPathX(ArrayList ps) { |
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Point2D[] _ps = new Point2D[ps.size()]; |
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for (int i=0 ; i<ps.size() ; i++){ |
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_ps[i] = (Point2D)ps.get(i);
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} |
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return getGeneralPathX(_ps);
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.geom.primitive.impl.Curve2D#getShapeType()
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*/
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public int getShapeType() { |
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return TYPES.CURVE;
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} |
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/* (non-Javadoc)
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* @see com.iver.cit.gvsig.fmap.core.FShape#cloneFShape()
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*/
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public FShape cloneFShape() {
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Spline2D curve = new Spline2D(getGeometryType());
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for (int i=0;i<points2d.size();i++){ |
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curve.addVertex(new org.gvsig.fmap.geom.primitive.impl.Point2D((Point2D)points2d.get(i))); |
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} |
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return (FShape)curve;
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} |
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/* (non-Javadoc)
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* @see com.iver.cit.gvsig.fmap.core.FShape#getStretchingHandlers()
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*/
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public Handler[] getStretchingHandlers() { |
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ArrayList handlers = new ArrayList(); |
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for (int i=0;i<points2d.size();i++) { |
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handlers.add(new PointHandler(i,
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((Point2D)points2d.get(i)).getX(),
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((Point2D)points2d.get(i)).getY()));
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} |
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return (Handler[]) handlers.toArray(new Handler[0]); |
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} |
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/* (non-Javadoc)
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* @see com.iver.cit.gvsig.fmap.core.FShape#getSelectHandlers()
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*/
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public Handler[] getSelectHandlers() { |
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ArrayList handlers = new ArrayList(); |
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for (int i=0;i<points2d.size();i++) { |
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Point2D p=((Point2D)points2d.get(i)); |
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handlers.add(new PointSelHandler(i, p.getX(), p.getY()));
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} |
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return (Handler[]) handlers.toArray(new Handler[0]); |
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} |
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/**
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* DOCUMENT ME!
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*
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* @author Vicente Caballero Navarro
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*/
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class PointHandler extends AbstractHandler implements FinalHandler{ |
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/**
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* Crea un nuevo PointHandler.
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*
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* @param x DOCUMENT ME!
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* @param y DOCUMENT ME!
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*/
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public PointHandler(int i,double x, double y) { |
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point = new Point2D.Double(x,y); |
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index=i; |
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} |
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/**
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* DOCUMENT ME!
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*
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* @param x DOCUMENT ME!
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* @param y DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public void move(double x, double y) { |
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point.setLocation(point.getX()+x,point.getY()+y); |
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//TODO falta actualizar el GeneralPathX
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} |
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/**
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* @see org.gvsig.fmap.geom.handler.Handler#set(double, double)
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*/
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public void set(double x, double y) { |
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point.setLocation(x,y); |
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//TODO falta actualizar el GeneralPathX
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} |
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} |
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/**
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* DOCUMENT ME!
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*
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* @author Vicente Caballero Navarro
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*/
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class PointSelHandler extends AbstractHandler implements FinalHandler{ |
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/**
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* Crea un nuevo PointHandler.
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*
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* @param x DOCUMENT ME!
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* @param y DOCUMENT ME!
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*/
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public PointSelHandler(int i,double x, double y) { |
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point = new Point2D.Double(x,y); |
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index=i; |
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} |
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/**
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* DOCUMENT ME!
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*
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* @param x DOCUMENT ME!
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* @param y DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public void move(double x, double y) { |
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point.setLocation(point.getX()+x,point.getY()+y); |
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Point2D setp = (Point2D) points2d.get(index); |
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setp.setLocation(point.getX(), point.getY()); |
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gp = getGeneralPathX(points2d); |
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} |
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/**
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* @see org.gvsig.fmap.geom.handler.Handler#set(double, double)
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*/
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public void set(double x, double y) { |
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point.setLocation(x,y); |
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Point2D setp = (Point2D) points2d.get(index); |
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setp.setLocation(point.getX(), point.getY()); |
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gp=getGeneralPathX(points2d); |
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} |
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} |
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static class Spline { |
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private double y[]; |
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private double y2[]; |
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/**
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* The constructor calculates the second derivatives of the interpolating function
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* at the tabulated points xi, with xi = (i, y[i]).
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* Based on numerical recipes in C, http://www.library.cornell.edu/nr/bookcpdf/c3-3.pdf .
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* @param y Array of y coordinates for cubic-spline interpolation.
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*/
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public Spline(double y[]) { |
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this.y = y;
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int n = y.length;
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y2 = new double[n]; |
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double u[] = new double[n]; |
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for (int i = 1; i < n - 1; i++) { |
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y2[i] = -1.0 / (4.0 + y2[i - 1]); |
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u[i] = (6.0 * (y[i + 1] - 2.0 * y[i] + y[i - 1]) - u[i - 1]) / (4.0 + y2[i - 1]); |
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} |
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for (int i = n - 2; i >= 0; i--) { |
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y2[i] = y2[i] * y2[i + 1] + u[i];
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} |
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} |
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/**
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* Returns a cubic-spline interpolated value y for the point between
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* point (n, y[n]) and (n+1, y[n+1), with t ranging from 0 for (n, y[n])
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* to 1 for (n+1, y[n+1]).
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* @param n The start point.
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* @param t The distance to the next point (0..1).
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* @return A cubic-spline interpolated value.
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*/
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public double fn(int n, double t) { |
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return t * y[n + 1] - ((t - 1.0) * t * ((t - 2.0) * y2[n] - (t + 1.0) * y2[n + 1])) / 6.0 + y[n] - t * y[n]; |
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} |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.geom.primitive.impl.OrientablePrimitive2D#transform(java.awt.geom.AffineTransform)
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*/
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public void transform(AffineTransform at) { |
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if (at == null) { |
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return;
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} |
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for (int i=0;i<points2d.size();i++) { |
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Point2D p= (Point2D)points2d.get(i); |
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at.transform(p, p); |
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} |
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gp.transform(at); |
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} |
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/* (non-Javadoc)
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* @see org.gvsig.fmap.geom.primitive.Curve2D#addPoint(org.gvsig.fmap.geom.primitive.Point)
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*/
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public void addVertex(Point point) { |
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points2d.add(new java.awt.geom.Point2D.Double(point.getX(), point.getY()));
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gp = getGeneralPathX(points2d); |
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} |
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} |