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;
}
void cb(double *t, int *kc)
/* Dynamic callback function */
{
XYZ rot;
int wc = 1; /* Use world coordinates */
XYZ off = { 0.01, 0.01, 0.0 }; /* Small offset for text */
int set;
char string[255];
s2sch(0.05); /* Set the text height */
if (*kc%2 == 0) {
ss2qpr(&rot, wc); /* Query the rotation point */
sprintf(string,"Rotation about (%.2f, %.2f, %.2f)",rot.x,rot.y,rot.z);
XYZ xyz = { 0.5, 0.5, 0.5 };
ss2scf(xyz, wc); /* Set the camera focus */
} else {
ss2qcf(&set, &rot, wc); /* Query the camera focus */
sprintf(string,"Focus at (%.2f, %.2f, %.2f)",rot.x,rot.y,rot.z);
}
ds2vtb(rot, off,string,1); /* Write some dynamic billboard text */
s2lab("","","","<space> to toggle mode");
/* Display an instructional label */
}
