Function:s2funtc

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s2funtc

Draw a curve defined by parametric equations fx(t), fy(t) and fz(t) with colour control.

Prototype

void s2funtc(float(*fx)(float*), float(*fy)(float*), float(*fz)(float*), float(*fc)(float*), int N, float tmin, float tmax);

Description

Like s2funt, but an additional function fc (whose return value is clipped to the range [0,1]) controls the colour of the line, according to the colour index range currently set.

See Also

s2funt Draw a curve defined by parametric equations fx(t), fy(t) and fz(t).

PGPLOT Equivalent

PGFUNT

Code Example

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "s2plot.h"

#define XLIMIT 10.0
#define YLIMIT 10.0
#define ZLIMIT 50.0
#define TWOPI 6.2831853

float fx(float *t)
{
  return XLIMIT * sin(*t);
}

inline float fy(float *t)
{
  return YLIMIT * *t / TWOPI * cos(*t);
}

float fz(float *t)
{
  return 20. + (ZLIMIT * *t / TWOPI + 4.*sin(5* *t)*sin(3* *t))*0.5;
}

float fc(float *t)
{
   return *t / TWOPI / 2.0 + 0.5;
}

int main(int argc, char *argv[])
{
   float x1 = -XLIMIT, x2 = XLIMIT;             /* x world coord range */
   float y1 = -YLIMIT, y2 = YLIMIT;             /* y world coord range */
   float z1 = -ZLIMIT/4.0, z2 = ZLIMIT;         /* z world coord range */

   s2opend("/?",argc,argv);                     /* Open the display */
   s2swin(x1,x2,y1,y2,z1,z2);                   /* Set the window coordinates */
   s2box("BCDET",0,0,"BCDET",0,0,"BCDET",0,0);  /* Draw coordinate box */
   s2sci(S2_PG_YELLOW);

   s2slw(3);                                    /* Set the line width */
   s2icm("rainbow", 3000, 3600);                /* Install a colour map */
   s2scir(3000, 3600);                          /* Set the colour range */

   s2funtc(fx, fy, fz, fc, 1000, -TWOPI, TWOPI);     
				/* Draw coloured parametric line */
   s2show(1);					/* Open the s2plot window */
   
   return 1;
}

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