root / trunk / libraries / libFMap / src / com / iver / cit / gvsig / fmap / core / FSpline2D.java @ 8946
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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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 2
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib??ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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package com.iver.cit.gvsig.fmap.core; |
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import java.awt.geom.Point2D; |
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import java.util.ArrayList; |
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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 FSpline2D extends FPolyline2D { |
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private Point2D[] points; |
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/**
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* Crea un nuevo FPolyline2D.
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*
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* @param gpx GeneralPathX.
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*/
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public FSpline2D(Point2D[] ps) { |
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super(getGeneralPathX(ps));
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points=ps; |
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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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/**
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* @see com.iver.cit.gvsig.fmap.core.FShape#getShapeType()
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*/
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public int getShapeType() { |
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return FShape.LINE;
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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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return new FSpline2D(points); |
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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<points.length;i++) { |
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handlers.add(new PointHandler(i, points[i].getX(), points[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<points.length;i++) { |
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Point2D p=points[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 IFinalHandler{ |
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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 com.iver.cit.gvsig.fmap.core.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 IFinalHandler{ |
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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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points[index]=point; |
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gp=getGeneralPathX(points); |
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} |
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/**
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* @see com.iver.cit.gvsig.fmap.core.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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points[index]=point; |
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gp=getGeneralPathX(points); |
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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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} |