Vector class : Vector « Development Class « C# / C Sharp

1. C# / C Sharp
2. Development Class
3. Vector

Vector class

        
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;

namespace CJC.DynamicsEngine.Engine.Util
{
  /**
   * CJC.DynamicsEngine - 2D Dynamics Engine
   * Release 0.1 alpha 
   * Vector class
   * Copyright 2007 Chris Cavanagh
   * 
   * Based on Flade source code by Alec Cove.
   * 
   * CJC.DynamicsEngine 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.
   *
   * CJC.DynamicsEngine 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.
   *
   * You should have received a copy of the GNU General Public License
   * along with CJC.DynamicsEngine; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  public class Vector : INotifyPropertyChanged
  {
    private static double atanZero = Math.Atan2( 0, 0 );
    private double x;
    private double y;

    public Vector( double px, double py )
    {
      x = px;
      y = py;
    }

    public Vector Clone()
    {
      return new Vector( x, y );
    }

    public void Set( double px, double py )
    {
      x = px;
      y = py;
    }

    public void Copy( Vector v )
    {
      x = v.x;
      y = v.y;
    }

    public double Dot( Vector v )
    {
      return x * v.x + y * v.y;
    }    

    public double Cross( Vector v )
    {
      return x * v.y - y * v.x;
    }

    public Vector Plus( Vector v )
    {
      x += v.x;
      y += v.y;
      return this;
    }

    public Vector PlusNew( Vector v )
    {
      return new Vector( x + v.x, y + v.y ); 
    }    

    public Vector Minus( Vector v )
    {
      x -= v.x;
      y -= v.y;
      return this;
    }

    public Vector MinusNew( Vector v )
    {
      return new Vector( x - v.x, y - v.y );
    }

    public Vector Mult( double s )
    {
      x *= s;
      y *= s;
      return this;
    }

    public Vector MultNew( double s )
    {
      return new Vector( x * s, y * s );
    }

    public double Distance( Vector v )
    {
      double dx = x - v.x;
      double dy = y - v.y;
      return Math.Sqrt( dx * dx + dy * dy );
    }

    public Vector Normalize()
    {
       double mag = Math.Sqrt( x * x + y * y );
       x /= mag;
       y /= mag;
       return this;
    }
    
    public double Magnitude()
    {
      return Math.Sqrt( x * x + y * y );
    }

    /**
     * projects this vector onto b
     */
    public Vector Project( Vector b )
    {
      double adotb = this.Dot( b );
      double len = ( b.x * b.x + b.y * b.y );

      Vector proj = new Vector( 0, 0 );
      proj.x = ( adotb / len ) * b.x;
      proj.y = ( adotb / len ) * b.y;
      return proj;
    }

    public Vector Rotate( double angle )
    {
      double sin = Math.Sin( angle );
      double cos = Math.Cos( angle );

      return new Vector( x * cos - y * sin, x * sin + y * cos );
    }

    public double Angle
    {
      get { return Math.Atan2( y, x ) - atanZero; }
    }

    public void OnPropertyChanged( string propertyName )
    {
      if ( PropertyChanged != null ) PropertyChanged( this, new PropertyChangedEventArgs( propertyName ) );
    }

    public double X { get { return x; } set { x = value; } }
    public double Y { get { return y; } set { y = value; } }

    #region INotifyPropertyChanged Members

    public event PropertyChangedEventHandler PropertyChanged;

    #endregion
  }
}

   
    
    
    
    
    
    
    
  

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