Maths - sfvec2f java

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/*Title:      mjbWorld
Copyright (c) 1998-2007 Martin John BakerThis program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.This program 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 General Public License for more details.For information about the GNU General Public License see http://www.gnu.org/To discuss this program http://sourceforge.net/forum/forum.php?forum_id=122133
   also see website https://www.euclideanspace.com/
   *//*
   for theory see:
   https://www.euclideanspace.com/maths/algebra/vectors/index.htm
   */package mjbModel;
   import java.io.*; // for steamtokenizer
   import java.lang.ref.*;
   import java.util.*; // for StringTokenizer
   /* x3d definition<!ENTITY % SFVec2f "CDATA"> <!-- Vector2Float -->
   *//**
   * holds a two dimentional vector
   **/
   public class sfvec2f extends property {/**
   * controls number of digits when saved to a file
   * VRML only supports float but allow override if higher resolution required    */
   static boolean saveAsDouble = false ;
   /** value of vector in x dimention */
   public double x;/** value of vector in y dimention */
   public double y;/** constructer initialise to zero length */
   public sfvec2f() {
   }/** constructer initialise to value x1 and y1
   * @param x1 value of vector in x dimention
   * @param y1 value of vector in y dimention
   */
   public sfvec2f(float x1,float y1) {
   x=x1;
   y=y1;
   }/** copy constructor
   * @param p copy values from this instance
   */
   public sfvec2f(sfvec2f p) {
   x=p.x;
   y=p.y;
   }public sfvec2f(double x1,double y1) {
   x=x1;
   y=y1;
   }/** static method to get the VRML name of this property
   * @return VRML name of this property
   */
   public static String vrmlType_s(){
   return "SFVec2f";
   }/** <summary>
   * method to get the VRML name of this property, need a non static method so
   * that it can be overriden
   * @return VRML name of this property
   */
   public String vrmlType(){
   return "SFVec2f";
   }/** override of clone for this class
   * @return a new instance with the same values as this
   */
   public Object clone() {
   return new sfvec2f(this);
   }/** create an array of this type
   * @param size size of the array
   * @return array of sfvec2f
   */
   public property[] createArray(int size){
   return new sfvec2f[size];
   }/** used when reading XML
   * called by sfparam which is called by mfparam which is called by filter_x3d
   *
   * expects val to be in following format (1.0 2.0)
   * @param val string containing the value
   * @param type
   */
   public void setAttribute(String val,String type){
   try {
   int v=0; //value being read
   StringTokenizer st = new StringTokenizer(val,"() \t\n\r\f"); // skip    these tokens
   while (st.hasMoreElements()) {
   try {
   switch (v) {
   case 0: x = Double.parseDouble(st.nextToken());break;
   case 1: y = Double.parseDouble(st.nextToken());break;
   default: st.nextToken();break; // skip token
   }
   v++; // valid number was read so goto next
   } catch (NumberFormatException e) {
   // if it is not a valid number continue while loop
   }
   }
   } catch (Exception e) {
   System.out.println("sfvec2f.setAttribute("+val+","+type+")    " + e.toString());
   }
   } public sfvec2f minus() {
   return new sfvec2f(-x,-y);
   }/** for theory see:
   https://www.euclideanspace.com/maths/algebra/vectors/index.htm
   */
   public void sub(sfvec2f other){
   x-= other.x;
   y-= other.y;
   }/** for theory see:
   https://www.euclideanspace.com/maths/algebra/vectors/index.htm
   */
   public void add(sfvec2f other){
   x+= other.x;
   y+= other.y;
   }/** returns true if v2 has same value of this
   * @param v2 vector to compare with
   * @return true if v2 has same value of this
   */
   boolean equals(sfvec2f v2) {
   if (v2==null) return false;
   if (x!= v2.x) return false;
   if (y!= v2.y) return false;
   return true;
   }/** output as a string
   // mode values
   // 0 - output modified values
   // 1 - output original values
   // 2 - output attribute
   // 3 - output attribute in brackets
   // 4 - output with f prefix
   */
   public String outstring(int format) {
   if (format == 3) {
   if (saveAsDouble)
   return "(" + x + " " + y + ")";
   else
   return "(" + new Float(x).toString() + " " +
   new Float(y).toString() + ")";
   } else if (format == 4) {
   return new Float(x).toString() + "f," +
   new Float(y).toString() + "f";
   } else {
   if (saveAsDouble)
   return "" + x + " " + y;
   else
   return new Float(x).toString() + " " +
   new Float(y).toString();
   }
   }/** write to file
   // filter = information about output
   // mode values
   // 0 - output VRML97 modified values
   // 1 - output VRML97 original values
   // 2 - output xml (x3d)
   // 3 - output attribute in brackets
   // 4 - output with f prefix
   */
   public void write(filter f,int mode,int indent){
   f.write(outstring(mode));
   } /**
   * returns string representing this vector in a form that can be used in source    code
   * @return string representing this vector in a form that can be used in source    code
   */
   public String toStatic() {
   return new Double(x).toString() + "f," +
   new Double(y).toString() + "f";
   }/** input a value to this vector from a file
   * used by mfparam.vrml2par
   * @param f
   * @param sfp
   * @param n
   * @param mode
   */
   public boolean instring(filter f,sfparam sfp,nodeBean n,int mode) {
   String s;
   try {
   s=f.nextToken();
   if (s!=null) if (s.equals("IS")) {
   s=f.nextToken();
   if (sfp!=null) sfp.setIs(s);
   return true;
   }
   x = Float.parseFloat(s);
   s=f.nextToken();
   y = Float.parseFloat(s);
   } catch (Exception e) {
   System.out.println("sfvec2f.instring error: " + e.toString());
   }
   return true;
   }/** parse string to set value of this vector
   * @param f
   * @param s1 string containing this vector
   */
   public boolean instring(filter f,String s1) {
   String s;
   try {
   x = Float.parseFloat(s1);
   s=f.nextToken();
   y = Float.parseFloat(s);
   } catch (Exception e){
   System.out.println("sfvec2f.instring error: " + e.toString());
   }
   return true;
   }/**
   * returns type of class which can edit this
   * @return type of class which can edit this
   * */
   static public Class getEditClass(){
   return sfvec2fEditor.class;
   }
   }