Function:ss2scaf
From S2PLOT
ss2scaf
Set the camera position, up vector, view direction and camera rotate/focus point.
Prototype
void ss2scaf(XYZ position, XYZ up, XYZ vdir, XYZ focus, int worldcoords);
Description
Set the camera position, up vector, view direction AND focus (rotate-about) point, all in one shot. If worldcoords > 0 then caller has given world coordinates, otherwise viewport coordinates are used. It is up to the caller to ensure a self-consistent camera position is given (orthogonal vectors).
See Also
| ss2sc | Set the camera position, up vector and view direction. |
| ss2qc | Query the camera position, up vector and view direction. |
| ss2sca | Set the camera aperture. |
| ss2qca | Query the camera aperture. |
| ss2scs | Set the camera speed. |
| ss2qcs | Query the camera speed. |
Code Example
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "s2plot.h"
int main(int argc, char *argv[])
{
XYZ pos; /* Camera position */
XYZ up; /* Camera up vector */
XYZ view; /* Camera view vector */
XYZ focus;
int wc = 1; /* Use world coordinates */
int i, N = 20; /* Loop variables */
float x, y, z; /* Temporary data */
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("BCDE",0,0,"BCDE",0,0,"BCDE",0,0); /* Draw coordinate box */
for (i=0;i<N;i++) {
x = drand48()*2.0 - 1.0; /* Random positions */
y = drand48()*2.0 - 1.0;
z = drand48()*2.0 - 1.0;
s2sci(15*drand48()+1); /* Random colour */
s2pt1(x, y, z, 1);
}
pos.x = 0.0; pos.y = 0.0; pos.z = 8.0;
up.x = 0.0; up.y = 1.0; up.z = 0.0;
view.x = 0.0; view.y = 0.0; view.z = -1.0;
focus.x = 0.0; focus.y = 0.0; focus.z = 1.0;
ns2thpoint(focus.x, focus.y, focus.z, 1,1,1, 8);
ss2scaf(pos, up, view, focus, wc); /* Set new camera position */
ss2sas(1);
s2show(1); /* Open the s2plot window */
return 1;
}
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