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added option to disable ball-ball collisions.

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This commit is contained in:
Antonio Carzaniga 2019-08-10 11:11:14 +02:00
parent ba725b3777
commit de93a620c1
1 changed files with 12 additions and 4 deletions
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16
balls.c
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@ -24,6 +24,8 @@ struct ball {
cairo_surface_t * surface;
};
static int collisions = 1;
static double delta = 0.01; /* seconds */
static unsigned int width = DEFAULT_WIDTH;
@ -128,10 +130,11 @@ static void ball_update_state (struct ball * p) {
}
static void update_state () {
for(int i = 0; i < n_balls; ++i)
for(int j = i + 1; j < n_balls; ++j)
ball_collision(balls + i, balls + j);
if (collisions) {
for(int i = 0; i < n_balls; ++i)
for(int j = i + 1; j < n_balls; ++j)
ball_collision(balls + i, balls + j);
}
for(int i = 0; i < n_balls; ++i)
ball_update_state(balls + i);
}
@ -314,6 +317,7 @@ void print_usage (const char * progname) {
"\tdelta=<frame-delta-time>\n"
"\tclear=<clear-alpha>\n"
"\t-v :: enables rendering timing statitstics\n",
"\t-c :: disables ball-ball collisions\n",
progname);
}
@ -373,6 +377,10 @@ int main (int argc, const char *argv[]) {
rendering_statistics = 1;
continue;
}
if (strcmp(argv[i], "-c") == 0) {
collisions = 0;
continue;
}
print_usage(argv[0]);
return 1;
}