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Make the probabilities data to assert that the expected value is less than 1.

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This commit is contained in:
Avi Weinstock 2021-03-06 15:11:19 -05:00
parent 22fcc6417c
commit c4f7c9b951
1 changed files with 19 additions and 5 deletions
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24
server/src/sys/object.rs
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@ -80,12 +80,26 @@ impl<'a> System<'a> for Sys {
let mut rng = rand::thread_rng();
// Note that if the expected fireworks per firework is > 1, this will
// eventually cause enough server lag that more players can't log in.
// 0.25 * 2 + (0.70 - 0.25) * 1 = 0.5 + 0.45 = 0.95
let num_fireworks = match rng.gen_range(0.0..1.0) {
x if x < 0.25 => 2,
x if x < 0.70 => 1,
_ => 0,
let thresholds: &[(f32, usize)] = &[(0.25, 2), (0.7, 1)];
let expected = {
let mut total = 0.0;
let mut cumulative_probability = 0.0;
for (p, n) in thresholds {
total += (p - cumulative_probability) * *n as f32;
cumulative_probability += p;
}
total
};
assert!(expected < 1.0);
let num_fireworks = (|| {
let x = rng.gen_range(0.0..1.0);
for (p, n) in thresholds {
if x < *p {
return *n;
}
}
0
})();
for _ in 0..num_fireworks {
let speed: f32 = rng.gen_range(40.0..80.0);
let theta: f32 = rng.gen_range(0.0..2.0 * PI);