void cb(double *t, int *kc)
{
static XYZ orbit; /* Position of point to draw */
static float tt = 0; /* Current position in orbit */
orbit.x = cos(tt); /* Update point position */
orbit.y = sin(tt);
tt += 0.05;
COLOUR ocol = { 1, 1, 0 }; /* Point colour = yellow*/
ns2vthpoint(orbit, ocol, 3); /* Draw the point */
}
void cb(double *t, int *kc)
{
COLOUR hilite = { 1.0, 1.0, 1.0 }; /* Highlight colour */
float hsize = 0.02; /* Size of handle */
int i; /* Loop variable */
if ((*kc%2) == 0) {
for (i=0;i<N;i++) {
ns2vthpoint(xyz[i], col[i], 3); /* Draw thick point */
ds2ah(xyz[i], hsize, col[i], hilite, i, sel[i]);
/* Draw handles */
}
} else {
for (i=0;i<N;i++) { /* Only show selected */
if (sel[i]) {
ns2vthpoint(xyz[i], col[i], 3); /* Draw thick point */
ds2ah(xyz[i], hsize, col[i], hilite, i, sel[i]);
/* Draw handles */
}
}
}
}
void cb(double *t, int *kc)
{
XYZ xyz = {0.0, 0.3, 0.4}; /* Location */
float isize = 0.05; /* Texture scale */
XYZ offset = { 0.2, 0.1, 0.0}; /* Texture offset to reference point */
float aspect = 2.2; /* Aspect ratio */
COLOUR col = { 1.0, 1.0, 0.0 }; /* Yellow */
float alpha = 0.9; /* Alpha channel */
char trans = 's'; /* Transparency */
float pangle = 45.0;
ds2vbbpr(xyz, offset, aspect, isize, pangle, col, tid, alpha, trans);
/* Billboard with aspect ratio and offset */
ns2vthpoint(xyz, col, 3); /* Plot texture reference point */
}
void cb(double *t, int *kc)
{
int N = 100; /* Number of points */
static int flag = -1; /* Flag for initialisation */
static XYZ xyz[100]; /* Array of point positions */
static COLOUR col[100]; /* Array of colours */
int i; /* Loop variable */
if (flag < 0) { /* First time through? */
for (i=0;i<N;i++) {
xyz[i].x = drand48()*2.0 - 1.0; /* Random data positions */
xyz[i].y = drand48()*2.0 - 1.0;
xyz[i].z = drand48()*2.0 - 1.0;
col[i].r = drand48(); /* Random data colours */
col[i].g = drand48();
col[i].b = drand48();
}
flag = 1; /* Set the flag */
}
s2swin(-0.8,0.8,-0.8,0.8,-0.8,0.8); /* Set new plotting window */
for (i=0;i<N;i++) {
ns2vthpoint(xyz[i], col[i], 3); /* Draw the point */
}
if (*kc % 2 == 1) /* Check for keyboard press */
s2twc(1); /* Turn on clipping */
else
s2twc(0); /* Turn off clipping */
int wc = s2qwc(); /* Query clipping state */
char text[32];
sprintf(text, "Clipping state: %d\n",wc); /* Prepare a text string */
s2textxy(0.0,0.0,0.0, text); /* Display text string */
s2lab("","","","Press <space> to toggle clipping state");
}
void cb(double *t, int *kc)
{
int N = 100; /* Number of points */
static int flag = -1; /* Flag for initialisation */
static XYZ xyz[100]; /* Array of point positions */
static COLOUR col[100]; /* Array of colours */
int i; /* Loop variable */
if (flag < 0) { /* First time through? */
for (i=0;i<N;i++) {
xyz[i].x = drand48()*2.0 - 1.0; /* Random data positions */
xyz[i].y = drand48()*2.0 - 1.0;
xyz[i].z = drand48()*2.0 - 1.0;
col[i].r = drand48(); /* Random data colours */
col[i].g = drand48();
col[i].b = drand48();
}
flag = 1; /* Set the flag */
}
for (i=0;i<N;i++) {
ns2vthpoint(xyz[i], col[i], 3); /* Draw the point */
}
static int lkc = 1; /* Last time <space> key pressed */
if (lkc != *kc) /* Check for keyboard press */
ss2sca(drand48()*70 + 20); /* Set the camera aperture */
lkc = *kc; /* Update key press */
int wc = ss2qca(); /* Query camera aperture */
char text[64];
sprintf(text, "Aperture %d degrees\n",wc); /* Prepare a text string */
s2textxy(0.0,0.0,0.0, text); /* Display text string */
s2lab("","","","Press <space> to change camera aperture");
}
