Function:cs2shcb
From S2PLOT
cs2shcb
Set the handle callback function for when a handle is (de)selected
Prototype
void cs2shcb(void *cbfn);
Description
Set the handle callback function; use NULL argument to cancel the callback. The handle callback function must be of the form:
void cbfn(int *id)
where id is the index of the selected handle.
A handle is selected/deselected by clicking the RIGHT MOUSE BUTTON while the mouse cursor is over the visible handle.
See Also
| cs2thv | Toggle the current state of selection handles . |
| cs2qhv | Query whether selection handles are currently visible. |
| ds2ah | Add a handle to allow interactive picking of objects |
| cs2th | Toggle the state of a named (dynamic) handle |
| cs2scb | Set the callback function; can be null to cancel callback. |
| cs2sncb | Set the function to call when number-keys pressed. |
| cs2socb | Register function that will draw direct OpenGL graphics when called. |
Code Example
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "s2plot.h"
#define N 100 /* Number of points */
XYZ xyz[N]; /* Global variable: positions */
COLOUR col[N]; /* Colour of the point */
int sel[N]; /* Global varibale: selected data */
void pick(int *id)
/* Callback when an item is clicked */
{
sel[*id] = (sel[*id]+1)%2; /* Toggle the selection */
cs2th(*id); /* Update handle list */
}
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 */
}
}
}
}
int main(int argc, char *argv[])
{
int i; /* Loop varibale */
float x, y, z; /* Random data */
srand48((long)time(NULL)); /* Seed random numbers */
fprintf(stderr,"Shift-s to toggle handles\nShift-c to toggle crosshair\n");
fprintf(stderr,"Right mouse select\nSpacebar toggle show all/show sel\n");
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 */
for (i=0;i<N;i++) { /* Set-up globals */
xyz[i].x = drand48()*2.0 - 1.0; /* Random position */
xyz[i].y = drand48()*2.0 - 1.0;
xyz[i].z = drand48()*2.0 - 1.0;
col[i].r = drand48(); /* Random colour */
col[i].g = drand48();
col[i].b = drand48();
sel[i] = 0; /* Not currently selected */
}
cs2scb(&cb); /* Install dynamic callback */
cs2shcb(&pick); /* Install handle callback */
s2slw(2); /* Set line width */
for (i=0;i<N;i++) { /* Non-selectable random data points */
x = drand48()*2.0 - 1.0;
y = drand48()*2.0 - 1.0;
z = drand48()*2.0 - 1.0;
s2sci(15*drand48() + 1); /* Random colour */
s2pt1(x,y,z,1);
}
s2show(1); /* Open the s2plot window */
return 1;
}
Back to S2PLOT function list.
