Function:ss2qc
From S2PLOT
ss2qc
Query the camera position, up vector and view direction.
Prototype
void ss2qc(XYZ *position, XYZ *up, XYZ *vdir, int worldcoords);
Description
Query the camera position, up vector and view direction (vdir). If worldcoords > 0 then return world coordinates, otherwise return viewport-relative coordinates.
Please note that this function returns camera position of LAST update. Calling it immediately after ss2sc without allowing a refresh or redraw will not return identical arguments as given to ss2sc. The return value can be checked for this possibility: if non-zero, then programmed changes to the camera are still pending.
See Also
| ss2sc | Set the camera position, up vector and view direction. |
| ss2sas | Start/Stop the camera rotation. |
| ss2tc | Enable/disable (1,0) camera translation. |
Code Example
#include <stdio.h>
#include <stdlib.h>
#include "s2plot.h"
void cb(double *t, int *kc)
{
char string[32];
int wc = 1; /* Use world coordinates */
XYZ pos, up, view; /* Camera parameters */
ss2qc(&pos, &up, &view, wc); /* Get camera parameters */
sprintf(string,"Camera @ %5.2f %5.2f %5.2f",pos.x,pos.y,pos.z);
s2textxy(-1.0,0.0,0.0, string);
}
int main(int argc, char *argv[])
{
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 */
cs2scb(&cb); /* Install a dynamic callback */
s2show(1); /* Open the s2plot window */
return 1;
}
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