Function:ss2scf

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ss2scf

Set the camera mid/focus point.

Prototype

void ss2scf(XYZ position, int worldcoords);

Description

Set the camera mid/focus point. If this is set, then rotation will be about the provided point (position). Use ss2ucf to revert to "auto" mid point. If worldcoords > 0 then caller has given world coordinates, otherwise they are viewport-relative coordinates.

See Also

ss2ucf Unset the camera mid/focus point - revert to auto mid-point.


Code Example

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

void numcb(int *N)
{
   if (*N != 1) return;
   ss2ucf();				/* Go back to rotating around centre */
}

int main(int argc, char *argv[])
{
   int i, N = 20;				/* Loop variables */
   float x, y, z;				/* Random data */
   XYZ focus;					/* Point to rotate about */
   int wc = 1;					/* Use world coordinates */

   srand48((long)time(NULL));			/* Seed random numbers */

   s2opend("/?",argc, argv);			/* Open the display */
   s2swin(-1.,1., -1.,1., -1.,1.);		/* Set the window coordinates */
   s2box("BCDET",0,0,"BCDET",0,0,"BCDET",0,0);	/* Draw coordinate box */

   s2slw(3);					/* Set line width */
   for (i=0;i<N;i++) {
      x = drand48()*2.0 - 1.0;			/* Random (x,y,z) */
      y = drand48()*2.0 - 1.0;
      z = drand48()*2.0 - 1.0;
      s2sci(15*drand48() + 1);			/* Random colour */
      s2pt1(x,y,z,1);				/* Plot the point */
   }

   focus.x = drand48()*2.0 - 1.0;		/* Random rotation point */
   focus.y = drand48()*2.0 - 1.0;
   focus.z = drand48()*2.0 - 1.0;
   ss2scf(focus, wc);			/* Set the rotation point */

   s2sch(0.7);					/* Set text height */
   s2textxy(-1,0,0,"Rotate camera - then press 1 followed by +"); 

   cs2sncb(&numcb);				/* Install number callback */

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

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