Add utility methods to SpriteCollection

src/lib.rs

@@ -49,7 +49,7 @@
 //! }
 //! ```
 
-use std::{cell::Cell, path::Path, ops::{DerefMut, Deref}};
+use std::{cell::Cell, path::Path, ops::{DerefMut, Deref}, slice::IterMut};
 
 use sdl2::{
     image::ImageRWops,
@@ -265,6 +265,42 @@ impl SpriteCollection {
 
         Ok(())
     }
+    
+    pub fn push(&mut self, s: Sprite) {
+        self.v.push(s); 
+    }
+
+    pub fn insert(&mut self, s: Sprite, index: usize) {
+        self.v.insert(index, s);
+    }
+    
+    pub fn pop(&mut self) -> Option<Sprite> {
+        self.v.pop()
+    }
+
+    pub fn remove(&mut self, index: usize) -> Sprite {
+        self.v.remove(index)
+    }
+
+    pub fn iter(&mut self) -> IterMut<'_, Sprite> {
+        self.v.iter_mut()
+    }
+
+    pub fn clear(&mut self) {
+        self.v.clear();
+    }
+
+    pub fn concat(&mut self, mut other: SpriteCollection) {
+        self.v.append(&mut *other);
+    }
+
+    pub fn len(&self) -> usize {
+        self.v.len()
+    }
+
+    pub fn get(&self, index: usize) -> Option<&Sprite> {
+        self.v.get(index)
+    }
 }
 
 impl Deref for SpriteCollection {

src/main.rs

@@ -39,7 +39,7 @@ fn main() {
         let angle = (y_diff as f64).atan2(x_diff as f64);
         s.set_angle(angle.to_degrees());
 
-        for spr in coll.iter_mut() {
+        for spr in coll.iter() {
             let (start_x, start_y) = spr.position();
             let m = sdl2::mouse::MouseState::new(event_pump.as_ref());
             let x_diff = m.x() - start_x;
@@ -68,7 +68,7 @@ fn main() {
 
                     s.translate(offset);
                     
-                    for spr in coll.iter_mut() {
+                    for spr in coll.iter() {
                         spr.translate(offset);
                     }
                 }