Be more functional

src/main.rs

@@ -90,19 +90,15 @@ impl Object {
 
     fn update_border_dist(&mut self, args: &RenderArgs) {
         self.window_size = vec![args.width, args.height];
-
-        let mut middle: Vec<f64> = Vec::new();
-        for size in &self.window_size {
-            middle.push(size / 2.0);
-        }
-
-        for (i, pos) in &mut self.pos.iter().enumerate() {
-            if pos < &mut middle[i as usize] {
-                self.border_dist[i as usize] = *pos;
-            } else {
-                self.border_dist[i as usize] = self.window_size[i as usize] - *pos;
-            }
-        }
+        self.border_dist = self
+            .pos
+            .iter()
+            .zip(&self.window_size)
+            .map(|(pos, win_size)| match *pos {
+                pos if pos < win_size / 2.0 => pos,
+                _ => win_size - pos,
+            })
+            .collect();
     }
 
     fn edge_repel(weighted_bd: f64, vel: f64, limiter: f64) -> f64 {
@@ -113,22 +109,23 @@ impl Object {
         let pos: Vec<f64> = self.get_pos();
         let dist: Vec<f64> = vec![pos[0] - mouse_pos[0], pos[1] - mouse_pos[1]];
         let amount = calc_amount(&dist);
-        for (i, d) in dist.iter().enumerate() {
-            self.vel[i] -= 0.2 * d / amount.max(0.1);
-            self.vel[i] = self.vel[i].min(10.0).max(-10.0);
-        }
+        self.vel = dist
+            .iter()
+            .zip(&self.vel)
+            .map(|(d, vel)| {
+                let res = vel - 0.2 * d / amount.max(0.1);
+                res.min(10.0).max(-10.0)
+            })
+            .collect();
     }
 
     fn attract(&mut self, objs: &mut Vec<Vec<f64>>) {
         let this_pos: Vec<f64> = self.get_pos();
         let distances: Vec<Vec<f64>> = objs
             .iter()
-            .map(
-                |obj_pos|
-                    {
-                        Object::calc_xy_distances(&this_pos, obj_pos)
-                    }
-            ).collect();
+            .map(|obj_pos| Object::calc_xy_distances(&this_pos, obj_pos))
+            .collect();
+
         for dist in distances {
             let amount = calc_amount(&dist);
             for (i, d) in dist.iter().enumerate() {
@@ -141,45 +138,26 @@ impl Object {
         obj_pos
             .iter()
             .zip(this_pos)
-            .map(
-                |(obj, this)|
-                    { obj - this }
-            ).collect()
+            .map(|(obj, this)| obj - this)
+            .collect()
     }
 
     fn repel(&mut self, obj_pos: &mut Vec<Vec<f64>>) {
         let this_pos: Vec<f64> = self.get_pos();
-        obj_pos
-            .iter()
-            .for_each(
-                |pos|
-                    {
-                        let dist_vec: Vec<f64> = this_pos.iter().zip(pos).map(|(t, p)| {t - p}).collect();
-                        // let mut dist_vec: Vec<f64> = Vec::new();
-                        // for i in 0..2 {
-                        //     dist_vec.push(this_pos[i] - pos[i]);
-                        // }
+        obj_pos.iter().for_each(|pos| {
+            let dist_vec: Vec<f64> = this_pos.iter().zip(pos).map(|(t, p)| t - p).collect();
             let amount = calc_amount(&dist_vec);
 
             self.apply_force_to_self(&dist_vec, amount)
-                    }
-            )
-        // for pos in obj_pos {
-        //     let mut dist_vec: Vec<f64> = Vec::new();
-        //     for i in 0..2 {
-        //         dist_vec.push(this_pos[i] - pos[i]);
-        //     }
-        //     let amount = calc_amount(&dist_vec);
-        //
-        //     self.apply_force_to_self(&mut dist_vec, amount)
-        // }
+        })
     }
 
     fn apply_force_to_self(&mut self, dist_vec: &Vec<f64>, amount: f64) {
-        for (i, d) in dist_vec.iter().enumerate() {
-            let repel_force = 1.5 * d.min(150.0).max(-150.0) / (amount).max(0.01);
-            self.vel[i] += repel_force;
-        }
+        self.vel = dist_vec
+            .iter()
+            .zip(&self.vel)
+            .map(|(d, vel)| vel + 1.5 * d.min(150.0).max(-150.0) / (amount).max(0.01))
+            .collect();
     }
 
     fn calc_vel(&mut self) -> Vec<f64> {
@@ -197,9 +175,12 @@ impl Object {
     }
 
     fn update_vel(&mut self, new_vel: Vec<f64>) {
-        for (i, d) in new_vel.iter().enumerate() {
-            self.vel[i] = ((self.vel[i] + d) / 2.0).max(-10.0).min(10.0);
-        }
+        self.vel = self
+            .vel
+            .iter()
+            .zip(new_vel)
+            .map(|(vel, new_vel)| ((vel + new_vel) / 2.0).max(-10.0).min(10.0))
+            .collect();
         let amount = calc_amount(&self.vel);
         for i in 0..2 {
             self.vel[i] *= 10.0 / amount;
@@ -278,20 +259,19 @@ fn main() {
     let mut events = Events::new(EventSettings::new());
     while let Some(e) = events.next(&mut window) {
         if let Some(r) = e.render_args() {
-            for i in 0..objects.len() {
-                objects[i].update_border_dist(&r);
-                objects[i].update();
-                positions[i] = objects[i].get_pos();
-            }
+            objects.iter_mut().for_each(|obj| {
+                obj.update_border_dist(&r);
+                obj.update();
+            });
+            positions = objects.iter().map(|obj| obj.get_pos()).collect();
             app.render(&objects, &r);
         }
 
         if let Some(_u) = e.update_args() {
-            for obj in &mut objects {
+            objects.iter_mut().for_each(|obj| {
                 obj.attract(&mut positions);
-                obj.repel(&mut positions);
-            }
-            // positions.clear()
+                obj.repel(&mut positions)
+            });
         }
 
         if let Some(p) = e.press_args() {
@@ -308,9 +288,7 @@ fn main() {
 
         if let Some(c) = e.mouse_cursor_args() {
             if m_attract {
-                for obj in &mut objects {
-                    obj.mouse_attract(c);
-                }
+                objects.iter_mut().for_each(|obj| obj.mouse_attract(c));
             }
         }
     }