DIR128 Class Reference

#include <mod128.h>

Public Member Functions
	DIR128 ()=default
	DIR128 (int16_t value)
	DIR128 (const FCOORD fc)
DIR128 &	operator= (int16_t value)
int8_t	operator- (const DIR128 &minus) const
DIR128	operator+ (const DIR128 &add) const
DIR128 &	operator+= (const DIR128 &add)
int8_t	get_dir () const

Detailed Description

Definition at line 29 of file mod128.h.

Constructor & Destructor Documentation

DIR128::DIR128 ( )

default

DIR128::DIR128 ( int16_t  value )

inline

Definition at line 34 of file mod128.h.

                          {  //value to assign
      value %= MODULUS;          //modulo arithmetic
      if (value < 0)
        value += MODULUS;        //done properly
      dir = static_cast<int8_t>(value);
    }

DIR128::DIR128

(

const FCOORD

fc

)

Definition at line 64 of file mod128.cpp.

                {
  int high, low, current;        //binary search

  low = 0;
  if (fc.y () == 0) {
    if (fc.x () >= 0)
      dir = 0;
    else
      dir = MODULUS / 2;
    return;
  }
  high = MODULUS;
  do {
    current = (high + low) / 2;
    if (dirtab[current] * fc >= 0)
      low = current;
    else
      high = current;
  }
  while (high - low > 1);
  dir = low;
}

Member Function Documentation

int8_t DIR128::get_dir ( ) const

inline

Definition at line 76 of file mod128.h.

                           {  //access function
      return dir;
    }

DIR128 DIR128::operator+ ( const DIR128 &  add ) const

inline

Definition at line 63 of file mod128.h.

    {
      DIR128 result;             //sum

      result = dir + add.dir;    //let = do the work
      return result;
    }

DIR128& DIR128::operator+= ( const DIR128 &  add )

inline

Definition at line 71 of file mod128.h.

                        {
      *this = dir + add.dir;     //let = do the work
      return *this;
    }

int8_t DIR128::operator- ( const DIR128 &  minus ) const

inline

Definition at line 51 of file mod128.h.

    {
                                 //result
      int16_t result = dir - minus.dir;

      if (result > MODULUS / 2)
        result -= MODULUS;       //get in range
      else if (result < -MODULUS / 2)
        result += MODULUS;
      return static_cast<int8_t>(result);
    }

DIR128& DIR128::operator= ( int16_t  value )

inline

Definition at line 43 of file mod128.h.

                   {               //value to assign
      value %= MODULUS;          //modulo arithmetic
      if (value < 0)
        value += MODULUS;        //done properly
      dir = static_cast<int8_t>(value);
      return *this;
    }

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The documentation for this class was generated from the following files:

• src/ccstruct/mod128.h
• src/ccstruct/mod128.cpp