X-Git-Url: http://dolda2000.com/gitweb/?a=blobdiff_plain;f=src%2Fcommon.rs;h=1cf205eea8758fa4eff764ab46ba244110970d2f;hb=ee533e13b52bf1fc13139dad7a9612c789c3d827;hp=01c0238ee278c39f0c44d0e80925579d279fd63d;hpb=249d43ea0ec6eed871bc7cb30aa9ee0ff0ed553f;p=kaka%2Frust-sdl-test.git

diff --git a/src/common.rs b/src/common.rs
index 01c0238..1cf205e 100644
--- 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 normalized(&self) -> Self {
+	let l = self.length();
+	Self {
+	    x: self.x / l,
+	    y: self.y / l,
+	}
+    }
+
+    pub fn to_radians(&self) -> Radians {
+	Radians(self.y.atan2(self.x))
+    }
+
+    pub fn to_degrees(&self) -> Degrees {
+	self.to_radians().to_degrees()
+    }
+
     pub fn to_i32(self) -> Point2D<i32> {
 	Point2D {
 	    x: self.x as i32,
@@ -129,9 +145,10 @@ impl<T> From<Point2D<T>> for (T, T) {
 
 impl From<Degrees> for Point2D<f64> {
     fn from(item: Degrees) -> Self {
+	let r = item.0.to_radians();
         Point2D {
-            x: (item.0 * std::f64::consts::PI / 180.0).cos(),
-            y: (item.0 * std::f64::consts::PI / 180.0).sin(),
+            x: r.cos(),
+            y: r.sin(),
         }
     }
 }
@@ -153,14 +170,14 @@ pub struct Radians(pub f64);
 impl Degrees {
     #[allow(dead_code)]
     fn to_radians(&self) -> Radians {
-	Radians(self.0 * std::f64::consts::PI / 180.0)
+	Radians(self.0.to_radians())
     }
 }
 
 impl Radians {
     #[allow(dead_code)]
     fn to_degrees(&self) -> Degrees {
-	Degrees(self.0 * 180.0 * std::f64::consts::FRAC_1_PI)
+	Degrees(self.0.to_degrees())
     }
 }