Function:ss2sfra
From S2PLOT
ss2sfra
Set the fisheye rotation angle (degrees).
Prototype
void ss2sfra(float rot);
Description
Set the fisheye rotation angle (degrees). This is only functional if the projection is in use is a fisheye, and it has the effect of rotating the projection "pole" away from the centre of the "screen", towards the bottom of the screen, by rot degrees.
See Also
| ss2qfra | Query the fisheye rotation angle. |
| s2ldev | List the available S2PLOT devices on stdout. |
| ss2tc | Enable/disable (1,0) camera translation. |
Code Example
#include <stdio.h>
#include <stdlib.h>
#include "s2plot.h"
int main(int argc, char *argv[])
{
XYZ start, end; /* End-points of line */
COLOUR col = { 1.0, 1.0, 0.0 }; /* Line colour */
s2opend("/S2FISH",argc, argv); /* Open the display: fisheye */
s2swin(-1.,1., -1.,1., -1.,1.); /* Set the window coordinates */
start.x = -1.0; end.x = +1.0; /* Set the end-points */
start.y = 0.0; end.y = 0.0;
start.z = 0.0; end.z = 0.0;
ns2vthline(start, end, col, 4); /* Draw a line */
ss2tc(0); /* Don't allow translation */
ss2sfra(-45.0); /* Rotate the centre up */
s2show(1); /* Open the s2plot window */
return 1;
}
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