Function:s2funxzr

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s2funxzr

Draw surface as per s2funxz, but with explicit settings for the colour range mapping.

Prototype

void s2funxzr(float(*fxz)(float*,float*), int nx, int nz, float xmin, float xmax, float zmin, float zmax, int ctl, float rmin, float rmax);

Description

Draw surface as per s2funxz, but with explicit settings for the colour range mapping between rmin and rmax.

See Also

s2funxy Draw the surface described by the provided function fxy.
s2funyz Draw the surface described by the provided function fyz.
s2funxzr Draw surface as per s2funxz, but with explicit settings for the colour range mapping.
s2env Convenience function which sets the plotting environment.


Code Example

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

#define XLIMIT 1.0
#define YLIMIT 1.0
#define ZLIMIT 1.0

float fxy(float *x, float *y)
{
   return ((*x)*(*x) + 0.25*(*y)*(*y));         /* Function to evaluate */
}

float fxz(float *x, float *z)
{
   return (0.1*(*x)*(*x) + 0.1*(*z)*(*z));      /* Function to evaluate */
}

float fyz(float *y, float *z)
{
   return (-0.3*(*y)*(*y) - 0.3*(*z)*(*z));     /* Function to evaluate */
}

int main(int argc, char *argv[])
{
   int nx = 64, ny = 64, nz = 64;
                                /* Resolution of grids to plot function on */
   int ctl = 0;                 /* User responsible for setting environ */

   float x1 = -XLIMIT*1.5, x2 = +XLIMIT*1.5;    /* World coordinates */
   float y1 = -YLIMIT*1.5, y2 = +YLIMIT*1.5;
   float z1 = -ZLIMIT*1.5, z2 = +ZLIMIT*1.5;
   float d1, d2;				/* Dummy variables */
   float rmin;                                  /* Minimum range value */
   float rmax;                                  /* Maximum range value */

   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 */

   s2icm("rainbow",1000,2000);
   s2scir(1000,2000);

   d1 = 0.0; d2 = 0.0;                          /* Dummy variables */
   rmin = fxy(&d1,&d2);                         /* Minimum at centre */
   d1 = XLIMIT; d2 = YLIMIT;
   rmax = 2.0*fxy(&d1, &d2);            /* Maximum at edge */
   s2funxyr(fxy, nx, ny, -XLIMIT,XLIMIT, -YLIMIT,YLIMIT, ctl, rmin, rmax);
                                /* Functional surface in X-Y plane */

   d1 = XLIMIT; d2 = ZLIMIT;                    /* Dummy variables */
   rmax = fxz(&d1, &d2);                        /* Maximum at edge */
   rmin = -rmax;
   s2funxzr(fxz, nx, nz, -XLIMIT,XLIMIT, -ZLIMIT,ZLIMIT, ctl, rmin, rmax);
                                /* Functional surface in X-Z plane */

   d1 = 0.0; d2 = 0.0;                          /* Dummy variables */
   rmax = fyz(&d1, &d2);                        /* Maximum at centre */
   d1 = YLIMIT; d2 = ZLIMIT;                    /* Dummy variables */
   rmin = fyz(&d1, &d2);                        /* Minimum at edge */
   s2funyzr(fyz, ny, nz, -YLIMIT,YLIMIT, -ZLIMIT,ZLIMIT, ctl, rmin, rmax);
                                /* Functional surface in Y-Y plane */

   s2show(1);                   /* Open the s2plot window */

   return 1;
}

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