2 files changed, 26 insertions, 17 deletions

diff --git a/game_server/src/collide.rs b/game_server/src/collide.rs
index ac046dd..21ec99c 100644
--- a/game_server/src/collide.rs
+++ b/game_server/src/collide.rs
@@ -1,4 +1,4 @@
-use crate::maths::{Vec2, Box, RBox};
+use crate::maths::{Vec2, AABox, RBox};
 
 pub trait Collide<Rhs> {
     fn collides(&self, other: &Rhs) -> bool;
@@ -10,13 +10,13 @@ impl Collide<Vec2> for Vec2 {
     }
 }
 
-impl Collide<Vec2> for Box {
+impl Collide<Vec2> for AABox {
     fn collides(&self, other: &Vec2) -> bool {
         self.pos < *other && other < &(self.pos + self.size) 
     }
 }
 
-impl Collide<Box> for Box {
+impl Collide<AABox> for AABox {
     fn collides(&self, other: &Self) -> bool {
         self.collides(&other.pos)
         || self.collides(&(other.pos + Vec2{x: other.size.x, y: 0.0}))
@@ -32,18 +32,14 @@ impl Collide<Box> for Box {
 
 impl Collide<Vec2> for RBox {
     fn collides(&self, other: &Vec2) -> bool {
-        let mut dx = self.size.x;
-        let mut dy = self.size.y;
-        let len = self.size.distance();
-        dx /= len;
-        dy /= len;
 
+        let da = self.size.norm();
         let dax = other.x - self.pos.x;
         let day = other.y - self.pos.y;
         
-        let dot = dax * dx + day * dy;
+        let dot = dax * da.x + day * da.y;
         let px = self.pos.x + dx * dot;
-        let py = self.pos.y + dy * dot;
+        let py = self.pos.y + da.y * dot;
        
         let p = Vec2{x: px, y: py};
         if !(self.pos < p && p < self.pos + self.size) {
@@ -58,7 +54,7 @@ impl Collide<Vec2> for RBox {
     }
 }
 
-impl Collide<Box> for RBox {
+impl Collide<AABox> for RBox {
     fn collides(&self, other: &Box) -> bool {
         self.collides(&other.pos)
         || self.collides(&(other.pos + Vec2{x: other.size.x, y: 0.0}))
@@ -72,3 +68,9 @@ impl Collide<Box> for RBox {
         
     }
 }
+
+impl<S, T: Collide<S>> Collide<S> for Vec<T> {
+    fn collides(&self, other: &S) -> bool {
+        self.iter().any(|x| x.collides(other))
+    }
+}
diff --git a/game_server/src/maths.rs b/game_server/src/maths.rs
index f5ceab4..7b844dc 100644
--- a/game_server/src/maths.rs
+++ b/game_server/src/maths.rs
@@ -63,30 +63,37 @@ impl Vec2 {
     pub fn distance2(&self) -> f32 {
         self.x * self.x + self.y * self.y
     }
+
+    pub fn norm(&self) -> Vec2 {
+        let len = self.size.distance();
+        Vec2 {
+            x: self.x / len,
+            y: self.y / len,    
+        }
+    }
 }
 
-pub struct Box {
+pub struct AABox {
     pub pos: Vec2,
     /// the size may not be smaller than zero
     pub size: Vec2, 
 }
 
-impl std::ops::Add<Vec2> for Box {
+impl std::ops::Add<Vec2> for AABox {
     type Output = Self;
     fn add(self, other: Vec2) -> Self {
         Self {
             pos: self.pos + other,
-            size: self.size + other,
         }
     }
 }
 
-impl std::ops::Sub<Vec2> for Box {
+impl std::ops::Sub<Vec2> for AABox {
     type Output = Self;
     fn sub(self, other: Vec2) -> Self {
         Self {
             pos: self.pos + other,
-            size: self.size + other
+            size: self.size
         }
     }
 }
@@ -105,7 +112,7 @@ impl std::ops::Add<Vec2> for RBox {
     fn add(self, other: Vec2) -> Self {
         Self {
             pos: self.pos + other,
-            size: self.size + other,
+            size: self.size,
             w: self.w,
         }
     }