root / org.gvsig.dxf / trunk / org.gvsig.dxf / org.gvsig.dxf.lib / src / main / java / org / gvsig / dxf / px / dxf / DxfCalArcs.java @ 6
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/*
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* Cresques Mapping Suite. Graphic Library for constructing mapping applications.
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*
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* Copyright (C) 2004-5.
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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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* cresques@gmail.com
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*/
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package org.gvsig.dxf.px.dxf; |
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import java.awt.geom.Point2D; |
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import java.util.Vector; |
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/**
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* Calcula puntos sobre un arco. Originalmente implementada para calcular los puntos
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* con un espaciamiento de un grado sexagesimal. Para el c�lculo de los puntos del arco
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* utiliza el primer y el �tlimo punto del arco y un par�metro de curvatura.
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* @author jmorell
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*
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*/
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public class DxfCalArcs { |
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final boolean debug = true; |
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Point2D coord1;
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Point2D coord2;
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Point2D center;
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double radio;
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double empieza;
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double acaba;
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double bulge;
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double d;
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double dd;
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double aci;
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Point2D coordAux;
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//private Point2D centralPoint;
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/**
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* Constructor de DxfCalArcs.
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* @param p1, punto inicial del arco.
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* @param p2, punto final del arco.
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* @param bulge, par�metro de curvatura.
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*/
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public DxfCalArcs(Point2D p1, Point2D p2, double bulge) { |
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this.bulge = bulge;
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if (bulge < 0.0) { |
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coord1 = p2; |
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coord2 = p1; |
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} else {
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coord1 = p1; |
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coord2 = p2; |
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} |
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calculate(); |
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} |
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/**
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* Calcula puntos sobre un arco.
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* @return DxfCalArcs
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*/
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DxfCalArcs calculate() { |
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d = Math.sqrt(((coord2.getX() - coord1.getX()) * (coord2.getX() -
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coord1.getX())) + |
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((coord2.getY() - coord1.getY()) * (coord2.getY() - |
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coord1.getY()))); |
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coordAux = new Point2D.Double((coord1.getX() + coord2.getX()) / 2.0, |
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(coord1.getY() + coord2.getY()) / 2.0);
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double b = Math.abs(bulge); |
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double beta = Math.atan(b); |
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double alfa = beta * 4.0; |
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double landa = alfa / 2.0; |
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dd = (d / 2.0) / (Math.tan(landa)); |
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radio = (d / 2.0) / (Math.sin(landa)); |
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aci = Math.atan((coord2.getX() - coord1.getX()) / (coord2.getY() -
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coord1.getY())); |
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double aciDegree = (aci * 180.0) / Math.PI; |
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if (coord2.getY() > coord1.getY()) {
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aci += Math.PI;
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aciDegree = (aci * 180.0) / Math.PI; |
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} |
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center = new Point2D.Double(coordAux.getX() + |
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(dd * Math.sin(aci + (Math.PI / 2.0))), |
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coordAux.getY() + |
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(dd * Math.cos(aci + (Math.PI / 2.0)))); |
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calculateEA(alfa); |
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return this; |
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} |
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/**
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* Calcula el �ngulo de comienzo y el de finalizaci�n del arco.
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* @param alfa, �ngulo del arco.
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*/
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void calculateEA(double alfa) { |
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empieza = Math.atan2(coord1.getY() - center.getY(),
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coord1.getX() - center.getX()); |
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acaba = (empieza + alfa); |
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empieza = (empieza * 180.0) / Math.PI; |
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acaba = (acaba * 180.0) / Math.PI; |
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} |
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/**
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* Devuelve un Vector con los puntos que conforman el arco.
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* @param inc, es el espaciamiento entre puntos (un grado sexagesimal por defecto).
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* @return Vector de puntos.
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*/
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public Vector getPoints(double inc) { |
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Vector arc = new Vector(); |
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double angulo;
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int iempieza = (int) empieza + 1; // ojo aqui !! |
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int iacaba = (int) acaba; |
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if (empieza <= acaba) {
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addNode(arc, empieza); |
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for (angulo = iempieza; angulo <= iacaba; angulo += inc) {
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addNode(arc, angulo); |
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} |
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addNode(arc, acaba); |
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} else {
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addNode(arc, empieza); |
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for (angulo = iempieza; angulo <= 360; angulo += inc) { |
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addNode(arc, angulo); |
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} |
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for (angulo = 1; angulo <= iacaba; angulo += inc) { |
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addNode(arc, angulo); |
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} |
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addNode(arc, angulo); |
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} |
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Point2D aux = (Point2D) arc.get(arc.size() - 1); |
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double aux1 = Math.abs(aux.getX() - coord2.getX()); |
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double aux2 = Math.abs(aux.getY() - coord2.getY()); |
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/*if (aux1<=0.000005 && aux2<=0.000005) {
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arc.remove(arc.size()-1);
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arc.remove(arc.size()-1);
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arc.add(coord2);
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}*/
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return arc;
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} |
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/**
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* Devuelve un Vector con puntos pertenecientes al arco y situados cerca de su
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* punto central.
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* @return Vector
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*/
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public Vector getCentralPoint() { |
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Vector arc = new Vector(); |
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if (empieza <= acaba) {
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addNode(arc, (empieza + acaba) / 2.0);
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} else {
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addNode(arc, empieza); |
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double alfa = 360 - empieza; |
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double beta = acaba;
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double an = alfa + beta;
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double mid = an / 2.0; |
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if (mid <= alfa) {
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addNode(arc, empieza + mid); |
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} else {
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addNode(arc, mid - alfa); |
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} |
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} |
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return arc;
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} |
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/**
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* A�ade un punto al arco basandose en un �ngulo dado.
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* @param arc, arco al que se a�ade el punto.
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* @param angulo, �ngulo donde se localiza el punto.
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*/
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private void addNode(Vector arc, double angulo) { |
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double yy = center.getY() +
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(radio * Math.sin((angulo * Math.PI) / 180.0)); |
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double xx = center.getX() +
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(radio * Math.cos((angulo * Math.PI) / 180.0)); |
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arc.add(new Point2D.Double(xx, yy)); |
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} |
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} |