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; } }

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