From 8052976133b5976205d1ab41eb411e4711552e72 Mon Sep 17 00:00:00 2001
From: Felix Ableitner <me@nutomic.com>
Date: Sun, 3 Oct 2021 21:23:32 +0200
Subject: [PATCH] have a couple ants walking in different directions

---
 src/main.rs | 44 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 39 insertions(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index a276486..1461117 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,9 @@
 use macroquad::prelude::*;
+use std::f32::consts::PI;
 
 fn window_conf() -> Conf {
     Conf {
+        window_title: "Ants".to_string(),
         fullscreen: false,
         window_width: 1280,
         window_height: 720,
@@ -9,18 +11,50 @@ fn window_conf() -> Conf {
     }
 }
 
+static ANT_SPEED: f32 = 20.;
+
+struct Ant {
+    pos: Vec2,
+    dir: f32,
+}
+
+impl Ant {
+    fn walk(&mut self) {
+        let acceleration = Vec2::new(self.dir.sin(), -self.dir.cos());
+        self.pos += acceleration * ANT_SPEED * get_frame_time();
+    }
+    fn draw(&self) {
+        draw_circle(self.pos.x, self.pos.y, 1., WHITE);
+    }
+}
+
+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()
+}
+
 #[macroquad::main(window_conf)]
 async fn main() {
     let map = load_texture("map_scaled.png").await.unwrap();
+    let mut ants = init_ants(16);
     loop {
-        clear_background(BEIGE);
-
-        draw_texture(map, 0., 0., WHITE);
-
+        // actions
+        ants.iter_mut().for_each(|ant| ant.walk());
         if is_key_down(KeyCode::Escape) || is_quit_requested() {
             return;
         }
 
+        // render
+        clear_background(BEIGE);
+        draw_texture(map, 0., 0., WHITE);
+        ants.iter().for_each(|ant| ant.draw());
+
         next_frame().await
     }
-}
\ No newline at end of file
+}