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/// Based on https://github.com/openfl/openfl-samples/tree/master/demos/BunnyMark
/// Original BunnyMark (and sprite) by Iain Lobb
use rand::rngs::ThreadRng;
use rand::{self, Rng};
use tetra::graphics::{self, Color, Texture};
use tetra::input::{self, MouseButton};
use tetra::math::Vec2;
use tetra::time;
use tetra::window;
use tetra::{Context, Settings, State};
// NOTE: Using a high number here yields worse performance than adding more bunnies over
// time - I think this is due to all of the RNG being run on the same tick...
const INITIAL_BUNNIES: usize = 100;
const WIDTH: i32 = 1280;
const HEIGHT: i32 = 720;
const GRAVITY: f32 = 0.5;
struct Bunny {
position: Vec2,
velocity: Vec2,
}
impl Bunny {
fn new(rng: &mut ThreadRng) -> Bunny {
let x_vel = rng.gen::<f32>() * 5.0;
let y_vel = (rng.gen::<f32>() * 5.0) - 2.5;
Bunny {
position: Vec2::new(0.0, 0.0),
velocity: Vec2::new(x_vel, y_vel),
}
}
}
struct GameState {
rng: ThreadRng,
texture: Texture,
bunnies: Vec<Bunny>,
max_x: f32,
max_y: f32,
click_timer: i32,
}
impl GameState {
fn new(ctx: &mut Context) -> tetra::Result<GameState> {
let mut rng = rand::thread_rng();
let texture = Texture::new(ctx, "./examples/resources/wabbit_alpha.png")?;
let mut bunnies = Vec::with_capacity(INITIAL_BUNNIES);
let max_x = (WIDTH - texture.width()) as f32;
let max_y = (HEIGHT - texture.height()) as f32;
for _ in 0..INITIAL_BUNNIES {
bunnies.push(Bunny::new(&mut rng));
}
Ok(GameState {
rng,
texture,
bunnies,
max_x,
max_y,
click_timer: 0,
})
}
}
impl State for GameState {
fn update(&mut self, ctx: &mut Context) -> tetra::Result {
if self.click_timer > 0 {
self.click_timer -= 1;
}
if input::is_mouse_button_down(ctx, MouseButton::Left) && self.click_timer == 0 {
for _ in 0..INITIAL_BUNNIES {
self.bunnies.push(Bunny::new(&mut self.rng));
}
self.click_timer = 10;
}
for bunny in &mut self.bunnies {
bunny.position += bunny.velocity;
bunny.velocity.y += GRAVITY;
if bunny.position.x > self.max_x {
bunny.velocity.x *= -1.0;
bunny.position.x = self.max_x;
} else if bunny.position.x < 0.0 {
bunny.velocity.x *= -1.0;
bunny.position.x = 0.0;
}
if bunny.position.y > self.max_y {
bunny.velocity.y *= -0.8;
bunny.position.y = self.max_y;
if self.rng.gen::<bool>() {
bunny.velocity.y -= 3.0 + (self.rng.gen::<f32>() * 4.0);
}
} else if bunny.position.y < 0.0 {
bunny.velocity.y = 0.0;
bunny.position.y = 0.0;
}
}
Ok(())
}
fn draw(&mut self, ctx: &mut Context, _dt: f64) -> tetra::Result {
graphics::clear(ctx, Color::rgb(0.392, 0.584, 0.929));
for bunny in &self.bunnies {
graphics::draw(ctx, &self.texture, bunny.position);
}
window::set_title(
ctx,
&format!(
"BunnyMark - {} bunnies - {:.0} FPS",
self.bunnies.len(),
time::get_fps(ctx)
),
);
Ok(())
}
}
fn main() {
tetra::run(
&Settings::new("BunnyMark", WIDTH, HEIGHT).quit_on_escape(true),
GameState::new,
);
}
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