Add get_val

asklyphe-frontend/src/math.rs

@@ -81,6 +81,18 @@ enum Atom {
 	Const(Const),
 }
 
+impl Atom {
+	fn get_val(&self) -> f64 {
+		match self {
+			Atom::Number(val) => *val,
+			Atom::Const(c) => match c {
+				Const::Pi => 3.141592653589793238462643383279,
+				Const::E => 2.718281828459045235360287471352,
+			}
+		}
+	}
+}
+
 #[derive(Debug, Copy, Clone)]
 enum Func {
 	Sine,