Add new floating-point functions.

RELEASES.md

@@ -55,6 +55,7 @@ Enhancements
 * `ahash` is used to hash function call parameters. This should yield speed improvements.
 * `Dynamic` and `ImmutableString` now implement `serde::Serialize` and `serde::Deserialize`.
 * `NativeCallContext` has a new field containing the name of the function called, useful when the same Rust function is registered under multiple names in Rhai.
+* New functions `PI()` and `E()` to return mathematical constants, and `to_radians` and `to_degrees` to convert between radians and degrees.
 
 
 Version 0.19.10

src/packages/math_basic.rs

@@ -154,6 +154,26 @@ mod trig_functions {
 mod float_functions {
     use crate::FLOAT;
 
+    #[rhai_fn(name = "E")]
+    pub fn e() -> FLOAT {
+        #[cfg(not(feature = "f32_float"))]
+        return crate::stdlib::f64::consts::E;
+        #[cfg(feature = "f32_float")]
+        return crate::stdlib::f32::consts::E;
+    }
+    #[rhai_fn(name = "PI")]
+    pub fn pi() -> FLOAT {
+        #[cfg(not(feature = "f32_float"))]
+        return crate::stdlib::f64::consts::PI;
+        #[cfg(feature = "f32_float")]
+        return crate::stdlib::f32::consts::PI;
+    }
+    pub fn to_radians(x: FLOAT) -> FLOAT {
+        x.to_radians()
+    }
+    pub fn to_degrees(x: FLOAT) -> FLOAT {
+        x.to_degrees()
+    }
     pub fn sqrt(x: FLOAT) -> FLOAT {
         x.sqrt()
     }