ants/src/ant.rs

use crate::constants::ANT_SPEED;
use crate::constants::MAP_HEIGHT;
use crate::constants::MAP_WIDTH;
use crate::Drawable;
use macroquad::prelude::*;
use macroquad::rand::RandomRange;
use std::f32::consts::PI;

pub(crate) struct Ant {
    pos: Vec2,
    dir: f32,
}

impl Ant {
    pub(crate) fn init(num: i32) -> Vec<Self> {
        let dir_steps = PI * 2. / num as f32;
        (0..num)
            .into_iter()
            .map(|n| Ant {
                pos: Vec2::new((MAP_WIDTH / 2) as f32, (MAP_HEIGHT / 2) as f32),
                dir: n as f32 * dir_steps,
            })
            .collect()
    }
    pub(crate) fn walk(&mut self, frame_time: f32, trail_map: &mut Image) {
        let new_dir = PI / 8. * RandomRange::gen_range(-2, 2) as f32;
        self.dir += new_dir;
        if self.dir > 2. * PI {
            self.dir -= 2. * PI;
        }

        let acceleration = Vec2::new(self.dir.sin(), -self.dir.cos());
        self.pos += acceleration * ANT_SPEED * frame_time;
        // TODO: this is not fixing out of bounds write
        self.pos.x = self.pos.x.clamp(0., MAP_WIDTH as f32);
        self.pos.y = self.pos.y.clamp(0., MAP_HEIGHT as f32);

        // TODO: change color over time
        trail_map.set_pixel(self.pos.x as u32, self.pos.y as u32, RED);
    }
}

impl Drawable for Ant {
    fn draw(&self) {
        draw_circle(self.pos.x, self.pos.y, 1., WHITE);
    }
}