// Program: 3055
//  Author: Manuel J. A. Eugster ( e0126312@student.tuwien.ac.at )
//  FileId: $Id: RGBVector.java,v 1.1.1.1 2001/12/10 18:56:04 heder Exp $



import java.lang.*;



// CLASS:
//    Vector with 3 values: red, green, blue.
//
public class RGBVector
{
  private double dCoordR;  // Red coordinate
  private double dCoordG;  // Green coordinate
  private double dCoordB;  // Blue coordinate



  // METHOD:
  //    Constructor.
  //
  public RGBVector( int iR, int iG, int iB )
  { 
    this.dCoordR = ( double ) iR;
    this.dCoordG = ( double ) iG;
    this.dCoordB = ( double ) iB;
  }
  
  

  // METHOD:
  //    Constructor.
  //  
  public RGBVector( double dR, double dG, double dB )
  {
    this.dCoordR = dR;
    this.dCoordG = dG;
    this.dCoordB = dB;
  }
  
  

  // METHOD:
  //    Subtract a vector from another one.
  //
  public RGBVector sub( RGBVector vSub )
  {
    return( new RGBVector( this.dCoordR - vSub.getCoordR(),
                           this.dCoordG - vSub.getCoordG(),
                           this.dCoordB - vSub.getCoordB() ) );
  }
  
  

  // METHOD:
  //    Calculates the length of a vector.
  // 
  public double length()
  { 
    return( Math.sqrt( this.dCoordR * this.dCoordR +
                       this.dCoordG * this.dCoordG +
                       this.dCoordB * this.dCoordB ) );
  }
  
  
  
  // METHOD:
  //    Returns the red coordinate.
  //  
  public double getCoordR()
  {
    return( ( double ) this.dCoordR );
  }
  
  

  // METHOD:
  //    Returns the green coordinate.
  //    
  public double getCoordG()
  {
    return( ( double ) this.dCoordG );
  }
  
  

  // METHOD:
  //    Returns the blue coordinate.
  //    
  public double getCoordB()
  {
    return( ( double ) this.dCoordB );
  }
  
  

  // METHOD:
  //    Returns the coordinate specified with index.
  //    
  public double getCoord( int iCoord )
  {
    if ( iCoord == 0 )
    {
      return( this.dCoordR );
    }
    
    if ( iCoord == 1 )
    {
      return( this.dCoordG );
    }
    
    if ( iCoord == 2 )
    {
      return( this.dCoordB );
    }
    
    
    return( 0d );    
  }
}