Limit stick point to unit vector

[kaka/rust-sdl-test.git] / src / common.rs

diff --git a/src/common.rs b/src/common.rs
index 01c0238..0d82903 100644 (file)
--- a/src/common.rs
+++ b/src/common.rs
@@ -14,10 +14,26 @@ pub struct Point2D<T> {
 }
 
 impl Point2D<f64> {
-    pub fn length(self) -> f64 {
+    pub fn length(&self) -> f64 {
         ((self.x * self.x) + (self.y * self.y)).sqrt()
     }
 
+    pub fn normalize(&self) -> Self {
+       let l = self.length();
+       Self {
+           x: self.x / l,
+           y: self.y / l,
+       }
+    }
+
+    pub fn radians(&self) -> Radians {
+       Radians(self.y.atan2(self.x))
+    }
+
+    pub fn degrees(&self) -> Degrees {
+       self.radians().to_degrees()
+    }
+
     pub fn to_i32(self) -> Point2D<i32> {
        Point2D {
            x: self.x as i32,