Add naive random walk for star candy

This commit is contained in:
Thomas Gideon 2017-07-13 17:03:56 -04:00
parent c649baf6ab
commit 69b8c5ee0c

View file

@ -15,6 +15,7 @@ pub struct Star {
pub y: f64,
w: f64,
h: f64,
dir: u32,
}
impl Star {
@ -38,6 +39,7 @@ impl Star {
w: bounds[2],
h: bounds[3],
sprite_id: sprite_id,
dir: rand_dir(),
}
}
@ -55,8 +57,49 @@ impl Star {
sprite.set_position(self.x, self.y);
}
}
let mov_x = rand::random::<f64>() * 0.5;
let mov_y = rand::random::<f64>() * 0.5;
self.dir = rand_turn(self.dir);
let dir = lookup_dir(self.dir);
let mov_x = 2.0 * dir.0;
let mov_y = 2.0 * dir.1;
scene.run(self.sprite_id, &Action(Ease(EaseFunction::CubicOut, Box::new(MoveBy(dt * 0.75, mov_x, mov_y)))));
}
}
fn rand_dir() -> u32 {
rand::random::<u32>() % 8
}
fn rand_turn(dir: u32) -> u32 {
let coin = rand::random::<i32>() % 10;
match coin {
-9 => {
if dir == 0 {
7
} else {
dir - 1
}
}
9 => {
if dir == 7 {
0
} else {
dir + 1
}
}
_ => dir,
}
}
fn lookup_dir(dir: u32) -> (f64, f64) {
match dir {
0 => (0.0, -1.0),
1 => (1.0, -1.0),
2 => (1.0, 0.0),
3 => (1.0, 1.0),
4 => (0.0, 1.0),
5 => (-1.0, 1.0),
6 => (-1.0, 0.0),
7 => (-1.0, -1.0),
_ => (0.0, 0.0),
}
}