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 2be427e..0d82903 100644 (file)
--- a/src/common.rs
+++ b/src/common.rs
@@ -1,7 +1,5 @@
 use std::ops::{Add, AddAssign, Sub, SubAssign, Mul, MulAssign, Div, DivAssign, Neg};
 
-pub type Nanoseconds = u64;
-
 #[macro_export]
 macro_rules! point {
     ( $x:expr, $y:expr ) => {
@@ -16,9 +14,32 @@ 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,
+           y: self.y as i32,
+       }
+    }
 }
 
 macro_rules! point_op {
@@ -116,6 +137,12 @@ impl<T> From<(T, T)> for Point2D<T> {
     }
 }
 
+impl<T> From<Point2D<T>> for (T, T) {
+    fn from(item: Point2D<T>) -> Self {
+        (item.x, item.y)
+    }
+}
+
 impl From<Degrees> for Point2D<f64> {
     fn from(item: Degrees) -> Self {
         Point2D {
@@ -134,18 +161,20 @@ impl From<Radians> for Point2D<f64> {
     }
 }
 
-#[derive(Debug, PartialEq, Clone, Copy)]
-struct Degrees(f64);
-#[derive(Debug, PartialEq, Clone, Copy)]
-struct Radians(f64);
+#[derive(Debug, Default, PartialEq, Clone, Copy)]
+pub struct Degrees(pub f64);
+#[derive(Debug, Default, PartialEq, Clone, Copy)]
+pub struct Radians(pub f64);
 
 impl Degrees {
+    #[allow(dead_code)]
     fn to_radians(&self) -> Radians {
        Radians(self.0 * std::f64::consts::PI / 180.0)
     }
 }
 
 impl Radians {
+    #[allow(dead_code)]
     fn to_degrees(&self) -> Degrees {
        Degrees(self.0 * 180.0 * std::f64::consts::FRAC_1_PI)
     }
@@ -180,6 +209,17 @@ impl<T> From<(T, T)> for Rect<T> {
     }
 }
 
+#[macro_export]
+macro_rules! hashmap {
+    ($($k:expr => $v:expr),*) => {
+       {
+           let mut map = std::collections::HashMap::new();
+           $(map.insert($k, $v);)*
+           map
+       }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;