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cc65/samples/geos/vector-demo.c

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#include <geos.h>
#include <conio.h>
#include <stdlib.h>
unsigned char x,y;
void_func oldMouseVector, oldKeyVector;
void foo1 (void)
{
// do something on mouse press/release
gotoxy(x,y);
++x;
cputc('A');
// call previous routine
oldMouseVector();
}
void foo2 (void)
{
// do something on key press/release
gotoxy(x,y);
++y;
cputc('B');
// call previous routine
oldKeyVector();
}
void hook_into_system(void)
{
// hook into system vectors - preserve old value
oldMouseVector = mouseVector;
mouseVector = foo1;
oldKeyVector = keyVector;
keyVector = foo2;
}
void remove_hooks(void)
{
mouseVector = oldMouseVector;
keyVector = oldKeyVector;
}
int main(void)
{
x = 0;
y = 0;
// To make cc65 do something for you before exiting you might register
// a function to be called using atexit call. #include <stdlib.h> then and
// write:
atexit(&remove_hooks);
clrscr();
cputsxy(0,1, CBOLDON "Just" COUTLINEON "a " CITALICON "string." CPLAINTEXT );
hook_into_system();
// This program will loop forever though
MainLoop();
// If not using atexit() you have to remember about restoring system vectors
// right before exiting your application. Otherwise the system will most
// likely crash.
// remove_hooks();
return 0;
}