From 291bb4de2a2e5940fbebd8d400f35c1fc3b0c7a2 Mon Sep 17 00:00:00 2001
From: Ben Bridle <bridle.benjamin@gmail.com>
Date: Sun, 24 Dec 2023 21:07:11 +1300
Subject: First commit

---
 src/proportion.rs | 107 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 src/proportion.rs

(limited to 'src/proportion.rs')

diff --git a/src/proportion.rs b/src/proportion.rs
new file mode 100644
index 0000000..aa8d1ae
--- /dev/null
+++ b/src/proportion.rs
@@ -0,0 +1,107 @@
+use crate::*;
+
+#[derive(Copy, Clone)]
+pub struct Proportion<T: Internal> {
+    pub(crate) value: T,
+}
+
+impl<I: Internal> Proportion<I> {
+    pub fn new(value: I) -> Self {
+        Self { value: value.clamp() }
+    }
+
+    pub const MIN: Self = Proportion {
+        value: <I as Internal>::MIN,
+    };
+    pub const MAX: Self = Proportion {
+        value: <I as Internal>::MAX,
+    };
+    pub const ZERO: Self = Self::MIN;
+    pub const ONE: Self = Self::MAX;
+
+    pub fn set(&mut self, new_value: I) {
+        self.value = new_value.clamp();
+    }
+
+    pub fn is_min(&self) -> bool {
+        self.value == I::MIN
+    }
+    pub fn is_max(&self) -> bool {
+        self.value == I::MAX
+    }
+
+    pub fn is_zero(&self) -> bool {
+        self.is_min()
+    }
+    pub fn is_one(&self) -> bool {
+        self.is_max()
+    }
+
+    pub fn as_u8(&self) -> u8 {
+        self.value.as_u8()
+    }
+    pub fn as_f32(&self) -> f32 {
+        self.value.as_f32()
+    }
+    pub fn as_f64(&self) -> f64 {
+        self.value.as_f64()
+    }
+
+    pub fn invert(&self) -> Self {
+        Self {
+            value: I::MAX - self.value,
+        }
+    }
+
+    pub fn value(&self) -> I {
+        self.value
+    }
+}
+
+macro_rules! impl_mul {
+    ($type:ty, $method:ident) => {
+        impl<I: Internal> std::ops::Mul<Proportion<I>> for $type {
+            type Output = $type;
+            fn mul(self, proportion: Proportion<I>) -> $type {
+                proportion.value.$method(self)
+            }
+        }
+        impl<I: Internal> std::ops::Mul<$type> for Proportion<I> {
+            type Output = $type;
+            fn mul(self, value: $type) -> $type {
+                self.value.$method(value)
+            }
+        }
+        impl<I: Internal> std::ops::Mul<&Proportion<I>> for $type {
+            type Output = $type;
+            fn mul(self, proportion: &Proportion<I>) -> $type {
+                proportion.value.$method(self)
+            }
+        }
+        impl<I: Internal> std::ops::Mul<$type> for &Proportion<I> {
+            type Output = $type;
+            fn mul(self, value: $type) -> $type {
+                self.value.$method(value)
+            }
+        }
+    };
+}
+
+impl_mul!(u8, mul_u8);
+impl_mul!(u16, mul_u16);
+impl_mul!(u32, mul_u32);
+impl_mul!(f32, mul_f32);
+impl_mul!(f64, mul_f64);
+
+use std::fmt::{Debug, Display, Formatter};
+
+impl<T: Internal> Debug for Proportion<T> {
+    fn fmt(&self, f: &mut Formatter) -> Result<(), std::fmt::Error> {
+        write!(f, "Proportion {{ {:.2} }}", self.as_f32())
+    }
+}
+impl<T: Internal> Display for Proportion<T> {
+    fn fmt(&self, f: &mut Formatter) -> Result<(), std::fmt::Error> {
+        write!(f, "{:.2}", self.as_f32())
+    }
+}
-- 
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