Function:ds2unprotect
From S2PLOT
ds2unprotect
Unprotect dynamic geometry.
Prototype
void ds2unprotect(void);
Description
Unprotect the dynamic geometry. Typically use this by setting ds2protect() at the end of your standard dynamic callback, then call ds2unprotect() if key presses / events processed by other callbacks will result in a changed geometry state. Use with caution ... incorrect use can result in TMC: total memory consumption.
See Also
| ds2protect | Protect dynamic geometry. |
| ds2isprotected | Query state of dynamic geometry protection. |
Code Example
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include "s2plot.h"
void ncb(int *N)
{
int pstate = ds2isprotected(); /* What is current protection state? */
if ((*N == 1) && (pstate == 0)) { /* Key 1 was pressed */
ds2protect(); /* Protect dynamic geometry */
}
if ((*N == 2) && (pstate == 1)) { /* Key 2 was pressed */
ds2unprotect(); /* Unprotect dynamic geometry */
}
}
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 */
char string[32]; /* Write instruction label */
sprintf(string,"Press 1 to protect, press 2 to unprotect");
s2lab("","","",string);
}
int main(int argc, char *argv[])
{
srand48((long)time(NULL)); /* Seed random numbers */
s2opend("/?", argc, argv); /* Prompt for display type */
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 dynamic geometry callback */
cs2sncb(ncb); /* Install number key press callback */
s2show(1); /* Open the s2plot window */
return 1;
}
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