Function:s2funtc
From S2PLOT
Revision as of 02:44, 23 November 2007; view current revision
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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
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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