colorfunction Class Reference

Mapping a color from blue to red along a unit length. More...

#include <graphmisc.h>

List of all members.

Public Member Functions
template<class T >
point3< T > &	operator() (point3< T > &p, T const v) const
	Map a value to a color.
template<class T >
void	operator() (T &x, T &y, T &z, T const v) const
	Map a value to a color.

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Detailed Description

Mapping a color from blue to red along a unit length.

See "Computer Visualization" by R.Gallagher, page 91.

Definition at line 910 of file graphmisc.h.

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Member Function Documentation

template<class T >

void colorfunction::operator()	(	T &	x,
		T &	y,
		T &	z,
		T const	v
	)			const [inline]

Map a value to a color.

Definition at line 1003 of file graphmisc.h.

{
  assert(v>=0.0);
  assert(v<=1.0);

  x = z = 0.0;
  y = 1.0;

  if (v>=0.75)
    x = 1.0;  
  else
    if (v>0.5)
      x = (v-0.5)/0.25;

  if (v<=0.25)
    z = 1.0;
  else
    if (v<0.5)
      z = 1.0 - (v-0.25)/0.25;

  if (v>0.75)
    y = 1.0 - (v-0.75)/0.25;
  else
    if (v<0.25)
      y = v/0.25;
}

template<class T >

point3< T > & colorfunction::operator()	(	point3< T > &	p,
		T const	v
	)			const [inline]

Map a value to a color.

Definition at line 973 of file graphmisc.h.

References point3< T >::x, point3< T >::y, and point3< T >::z.

{
  assert(v>=0.0);
  assert(v<=1.0);

  p.x =  p.z = 0.0;
  p.y = 1.0;

  if (v>=0.75)
    p.x = 1.0;  
  else
    if (v>0.5)
      p.x = (v-0.5)/0.25;

  if (v<=0.25)
    p.z = 1.0;
  else
    if (v<0.5)
      p.z = 1.0 - (v-0.25)/0.25;

  if (v>0.75)
    p.y = 1.0 - (v-0.75)/0.25;
  else
    if (v<0.25)
      p.y = v/0.25;

  return p;
}

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

• graphicslib/graphmisc.h