QUAD_COEFFS Class Reference

#include <quadratc.h>

Public Member Functions
	QUAD_COEFFS ()
	QUAD_COEFFS (double xsq, float x, float constant)
float	y (float x) const
void	move (ICOORD vec)

Public Attributes
double	a
float	b
float	c

Detailed Description

Definition at line 25 of file quadratc.h.

Constructor & Destructor Documentation

QUAD_COEFFS::QUAD_COEFFS ( )

inline

Definition at line 28 of file quadratc.h.

                  {
    }                            //empty constructor

QUAD_COEFFS::QUAD_COEFFS ( double  xsq, float  x, float  constant  )

inline

Definition at line 30 of file quadratc.h.

                                {
      a = xsq;
      b = x;
      c = constant;
    }

Member Function Documentation

void QUAD_COEFFS::move ( ICOORD  vec )

inline

Definition at line 44 of file quadratc.h.

                          {  // by vector
      /************************************************************
        y - q = a (x - p)^2 + b (x - p) + c
        y - q = ax^2 - 2apx + ap^2 + bx - bp + c
          y = ax^2 + (b - 2ap)x + (c - bp + ap^2 + q)
      ************************************************************/
      inT16 p = vec.x ();
      inT16 q = vec.y ();

      c = (float) (c - b * p + a * p * p + q);
      b = (float) (b - 2 * a * p);
    }

float QUAD_COEFFS::y ( float  x ) const

inline

Definition at line 39 of file quadratc.h.

                           {  //at x
      return (float) ((a * x + b) * x + c);
    }

Member Data Documentation

double QUAD_COEFFS::a

Definition at line 58 of file quadratc.h.

float QUAD_COEFFS::b

Definition at line 59 of file quadratc.h.

float QUAD_COEFFS::c

Definition at line 60 of file quadratc.h.

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

• ccstruct/quadratc.h