Add new floating-point functions.

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()
     }