ants/src/ant.rs

use macroquad::prelude::*;
use std::f32::consts::PI;
use crate::constants::{FLOOR_COLOR, ANT_SPEED};
use macroquad::rand::RandomRange;

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

impl Ant {
  pub(crate)fn walk(&mut self, map_data: &Image) {
    let new_dir = PI / 8. * RandomRange::gen_range(-2, 2) as f32;
    self.dir = self.dir + new_dir;
    self.dir = self.dir.clamp(0., PI * 2.);


    let acceleration = Vec2::new(self.dir.sin(), -self.dir.cos());
    let new_pos = self.pos + acceleration * ANT_SPEED * get_frame_time();
    let dest_pixel = map_data.get_pixel(new_pos.x as u32, new_pos.y as u32);
    if dest_pixel == FLOOR_COLOR {
      self.pos = new_pos;
    }
  }
  pub(crate)fn draw(&self) {
    draw_circle(self.pos.x, self.pos.y, 1., BLACK);
  }
}

pub(crate) fn init_ants(num_ants: i32) -> Vec<Ant> {
  let dir_steps = PI * 2. / num_ants as f32;
  (0..num_ants)
    .into_iter()
    .map(|n| Ant {
      pos: Vec2::new(400., 200.),
      dir: n as f32 * dir_steps,
    })
    .collect()
}