svn-gvsig-desktop / trunk / libraries / libDwg / src / com / iver / cit / javacad / util / GisModelCurveCalculator.java @ 2896
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/* jdwglib. Java Library for reading Dwg files.
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*
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* Author: Jose Morell Rama (jose.morell@gmail.com).
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* Port from the Pythoncad Dwg library by Art Haas.
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*
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* Copyright (C) 2005 Jose Morell, IVER TI S.A. 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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* Jose Morell (jose.morell@gmail.com)
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*
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* or
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*
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* IVER TI S.A.
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* C/Salamanca, 50
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* 46005 Valencia
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* Spain
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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.javacad.util; |
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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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* This class allows to obtain arcs and circles given by the most usual parameters, in a
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* Gis geometry model. In this model, an arc or a circle is given by a set of points that
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* defines it shape
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*
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* @author jmorell
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*/
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public class GisModelCurveCalculator { |
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/**
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* This method calculates an array of Point2D that represents a circle. The distance
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* between it points is 1 angular unit
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*
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* @param c Point2D that represents the center of the circle
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* @param r double value that represents the radius of the circle
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* @return Point2D[] An array of Point2D that represents the shape of the circle
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*/
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public static Point2D[] calculateGisModelCircle(Point2D c, double r) { |
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Point2D[] pts = new Point2D[360]; |
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int angulo = 0; |
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for (angulo=0; angulo<360; angulo++) { |
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pts[angulo] = new Point2D.Double(c.getX(), c.getY()); |
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pts[angulo].setLocation(pts[angulo].getX() + r * Math.sin(angulo*Math.PI/(double)180.0), pts[angulo].getY() + r * Math.cos(angulo*Math.PI/(double)180.0)); |
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} |
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return pts;
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} |
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/**
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* This method calculates an array of Point2D that represents a ellipse. The distance
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* between it points is 1 angular unit
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*
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* @param center Point2D that represents the center of the ellipse
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* @param majorAxisVector Point2D that represents the vector for the major axis
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* @param axisRatio double value that represents the axis ratio
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* @param initAngle double value that represents the start angle of the ellipse arc
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* @param endAngle double value that represents the end angle of the ellipse arc
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* @return Point2D[] An array of Point2D that represents the shape of the ellipse
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*/
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public static Point2D[] calculateGisModelEllipse(Point2D center, Point2D majorAxisVector, double axisRatio, double initAngle, double endAngle) { |
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Point2D majorPoint = new Point2D.Double(center.getX()+majorAxisVector.getX(), center.getY()+majorAxisVector.getY()); |
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double orientation = Math.atan(majorAxisVector.getY()/majorAxisVector.getX()); |
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double semiMajorAxisLength = center.distance(majorPoint);
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double semiMinorAxisLength = semiMajorAxisLength*axisRatio;
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double eccentricity = Math.sqrt(1-((Math.pow(semiMinorAxisLength, 2))/(Math.pow(semiMajorAxisLength, 2)))); |
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int isa = (int)initAngle; |
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int iea = (int)endAngle; |
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double angulo;
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Point2D[] pts; |
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if (initAngle <= endAngle) {
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pts = new Point2D[(iea-isa)+2]; |
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angulo = initAngle; |
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double r = semiMinorAxisLength/Math.sqrt(1-((Math.pow(eccentricity, 2))*(Math.pow(Math.cos(angulo*Math.PI/(double)180.0), 2)))); |
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double x = r*Math.cos(angulo*Math.PI/(double)180.0); |
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double y = r*Math.sin(angulo*Math.PI/(double)180.0); |
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double xrot = x*Math.cos(orientation) - y*Math.sin(orientation); |
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double yrot = x*Math.sin(orientation) + y*Math.cos(orientation); |
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pts[0] = new Point2D.Double(center.getX() + xrot, center.getY() + yrot); |
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for (int i=1; i<=(iea-isa)+1; i++) { |
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angulo = (double)(isa+i);
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r = semiMinorAxisLength/Math.sqrt(1-((Math.pow(eccentricity, 2))*(Math.pow(Math.cos(angulo*Math.PI/(double)180.0), 2)))); |
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x = r*Math.cos(angulo*Math.PI/(double)180.0); |
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y = r*Math.sin(angulo*Math.PI/(double)180.0); |
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xrot = x*Math.cos(orientation) - y*Math.sin(orientation); |
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yrot = x*Math.sin(orientation) + y*Math.cos(orientation); |
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pts[i] = new Point2D.Double(center.getX() + xrot, center.getY() + yrot); |
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} |
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angulo = endAngle; |
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r = semiMinorAxisLength/Math.sqrt(1-((Math.pow(eccentricity, 2))*(Math.pow(Math.cos(angulo*Math.PI/(double)180.0), 2)))); |
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x = r*Math.cos(angulo*Math.PI/(double)180.0); |
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y = r*Math.sin(angulo*Math.PI/(double)180.0); |
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xrot = x*Math.cos(orientation) - y*Math.sin(orientation); |
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yrot = x*Math.sin(orientation) + y*Math.cos(orientation); |
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pts[(iea-isa)+1] = new Point2D.Double(center.getX() + xrot, center.getY() + yrot); |
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} else {
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pts = new Point2D[(360-isa)+iea+2]; |
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angulo = initAngle; |
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double r = semiMinorAxisLength/Math.sqrt(1-((Math.pow(eccentricity, 2))*(Math.pow(Math.cos(angulo*Math.PI/(double)180.0), 2)))); |
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double x = r*Math.cos(angulo*Math.PI/(double)180.0); |
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double y = r*Math.sin(angulo*Math.PI/(double)180.0); |
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double xrot = x*Math.cos(orientation) - y*Math.sin(orientation); |
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double yrot = x*Math.sin(orientation) + y*Math.cos(orientation); |
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pts[0] = new Point2D.Double(center.getX() + r*Math.cos(angulo*Math.PI/(double)180.0), center.getY() + r*Math.sin(angulo*Math.PI/(double)180.0)); |
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for (int i=1; i<=(360-isa); i++) { |
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angulo = (double)(isa+i);
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r = semiMinorAxisLength/Math.sqrt(1-((Math.pow(eccentricity, 2))*(Math.pow(Math.cos(angulo*Math.PI/(double)180.0), 2)))); |
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x = r*Math.cos(angulo*Math.PI/(double)180.0); |
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y = r*Math.sin(angulo*Math.PI/(double)180.0); |
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xrot = x*Math.cos(orientation) - y*Math.sin(orientation); |
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yrot = x*Math.sin(orientation) + y*Math.cos(orientation); |
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pts[i] = new Point2D.Double(center.getX() + xrot, center.getY() + yrot); |
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} |
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for (int i=(360-isa)+1; i<=(360-isa)+iea; i++) { |
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angulo = (double)(i-(360-isa)); |
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r = semiMinorAxisLength/Math.sqrt(1-((Math.pow(eccentricity, 2))*(Math.pow(Math.cos(angulo*Math.PI/(double)180.0), 2)))); |
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x = r*Math.cos(angulo*Math.PI/(double)180.0); |
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y = r*Math.sin(angulo*Math.PI/(double)180.0); |
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xrot = x*Math.cos(orientation) - y*Math.sin(orientation); |
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yrot = x*Math.sin(orientation) + y*Math.cos(orientation); |
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pts[i] = new Point2D.Double(center.getX() + xrot, center.getY() + yrot); |
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} |
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angulo = endAngle; |
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r = semiMinorAxisLength/Math.sqrt(1-((Math.pow(eccentricity, 2))*(Math.pow(Math.cos(angulo*Math.PI/(double)180.0), 2)))); |
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x = r*Math.cos(angulo*Math.PI/(double)180.0); |
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y = r*Math.sin(angulo*Math.PI/(double)180.0); |
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xrot = x*Math.cos(orientation) - y*Math.sin(orientation); |
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yrot = x*Math.sin(orientation) + y*Math.cos(orientation); |
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pts[(360-isa)+iea+1] = new Point2D.Double(center.getX() + xrot, center.getY() + yrot); |
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} |
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return pts;
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} |
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/**
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* This method calculates an array of Point2D that represents an arc. The distance
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* between it points is 1 angular unit
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*
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* @param c Point2D that represents the center of the arc
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* @param r double value that represents the radius of the arc
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* @param sa double value that represents the start angle of the arc
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* @param ea double value that represents the end angle of the arc
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* @return Point2D[] An array of Point2D that represents the shape of the arc
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*/
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public static Point2D[] calculateGisModelArc(Point2D c, double r, double sa, double ea) { |
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int isa = (int)sa; |
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int iea = (int)ea; |
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double angulo;
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Point2D[] pts; |
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if (sa <= ea) {
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pts = new Point2D[(iea-isa)+2]; |
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angulo = sa; |
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pts[0] = new Point2D.Double(c.getX() + r * Math.cos(angulo*Math.PI/(double)180.0), c.getY() + r * Math.sin(angulo*Math.PI/(double)180.0)); |
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for (int i=1; i<=(iea-isa)+1; i++) { |
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angulo = (double)(isa+i);
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pts[i] = new Point2D.Double(c.getX() + r * Math.cos(angulo*Math.PI/(double)180.0), c.getY() + r * Math.sin(angulo*Math.PI/(double)180.0)); |
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} |
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angulo = ea; |
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pts[(iea-isa)+1] = new Point2D.Double(c.getX() + r * Math.cos(angulo*Math.PI/(double)180.0), c.getY() + r * Math.sin(angulo*Math.PI/(double)180.0)); |
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} else {
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pts = new Point2D[(360-isa)+iea+2]; |
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angulo = sa; |
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pts[0] = new Point2D.Double(c.getX() + r * Math.cos(angulo*Math.PI/(double)180.0), c.getY() + r * Math.sin(angulo*Math.PI/(double)180.0)); |
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for (int i=1; i<=(360-isa); i++) { |
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angulo = (double)(isa+i);
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pts[i] = new Point2D.Double(c.getX() + r * Math.cos(angulo*Math.PI/(double)180.0), c.getY() + r * Math.sin(angulo*Math.PI/(double)180.0)); |
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} |
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for (int i=(360-isa)+1; i<=(360-isa)+iea; i++) { |
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angulo = (double)(i-(360-isa)); |
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pts[i] = new Point2D.Double(c.getX() + r * Math.cos(angulo*Math.PI/(double)180.0), c.getY() + r * Math.sin(angulo*Math.PI/(double)180.0)); |
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} |
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angulo = ea; |
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pts[(360-isa)+iea+1] = new Point2D.Double(c.getX() + r * Math.cos(angulo*Math.PI/(double)180.0), c.getY() + r * Math.sin(angulo*Math.PI/(double)180.0)); |
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} |
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return pts;
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} |
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/**
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* This method applies an array of bulges to an array of Point2D that defines a
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* polyline. The result is a polyline with the input points with the addition of the
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* points that define the new arcs added to the polyline
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*
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* @param newPts Base points of the polyline
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* @param bulges Array of bulge parameters
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* @return Polyline with a new set of arcs added and defined by the bulge parameters
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*/
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public static Point2D[] calculateGisModelBulge(Point2D[] newPts, double[] bulges) { |
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Vector ptspol = new Vector(); |
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Point2D init = new Point2D.Double(); |
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Point2D end = new Point2D.Double(); |
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for (int j=0; j<newPts.length; j++) { |
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init = newPts[j]; |
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if (j!=newPts.length-1) end = newPts[j+1]; |
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if (bulges[j]==0 || j==newPts.length-1 || (init.getX()==end.getX() && init.getY()==end.getY())) { |
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ptspol.add(init); |
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} else {
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ArcFromBulgeCalculator arcCalculator = new ArcFromBulgeCalculator(init, end, bulges[j]);
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Vector arc = arcCalculator.getPoints(1); |
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if (bulges[j]<0) { |
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for (int k=arc.size()-1; k>=0; k--) { |
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ptspol.add(arc.get(k)); |
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} |
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ptspol.remove(ptspol.size()-1);
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} else {
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for (int k=0;k<arc.size();k++) { |
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ptspol.add(arc.get(k)); |
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} |
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ptspol.remove(ptspol.size()-1);
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} |
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} |
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} |
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Point2D[] points = new Point2D[ptspol.size()]; |
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for (int j=0;j<ptspol.size();j++) { |
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points[j] = (Point2D)ptspol.get(j);
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} |
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return points;
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} |
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} |