From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 16 Sep 2016 22:38:05 +0000 (+0300)
Subject: Use numeric literals in place of M_PI
X-Git-Url: http://git.tdb.fi/?p=libs%2Fmath.git;a=commitdiff_plain;h=540bea4f0254725c003c73f7340c1d48ac0c86f5

Use numeric literals in place of M_PI

Recent Windows headers require _USE_MATH_DEFINES to be #defined in order
to #define M_PI, but we can't guarantee that someone else won't #include
<cmath> before us.
---

diff --git a/source/geometry/angle.h b/source/geometry/angle.h
index 207a5a2..2d178d2 100644
--- a/source/geometry/angle.h
+++ b/source/geometry/angle.h
@@ -27,15 +27,15 @@ public:
 	static Angle from_turns(T);
 
 	static Angle zero() { return from_radians(0); }
-	static Angle right() { return from_radians(M_PI/2); }
+	static Angle right() { return from_turns(0.25); }
 	static Angle quarter_turn() { return right(); }
-	static Angle straight() { return from_radians(M_PI); }
+	static Angle straight() { return from_turns(0.5); }
 	static Angle half_turn() { return straight(); }
-	static Angle full_turn() { return from_radians(2*M_PI); }
+	static Angle full_turn() { return from_turns(1); }
 
-	T degrees() const { return value*180/M_PI; }
+	T degrees() const { return value*57.2957795130823208768; }
 	T radians() const { return value; }
-	T turns() const { return value/(2*M_PI); }
+	T turns() const { return value/6.28318530717958647692; }
 
 	Angle &operator+=(const Angle &);
 	Angle &operator-=(const Angle &);
@@ -57,7 +57,7 @@ public:
 template<typename T>
 inline Angle<T> Angle<T>::from_degrees(T d)
 {
-	return Angle<T>(d*M_PI/180);
+	return Angle<T>(d/57.2957795130823208768);
 }
 
 template<typename T>
@@ -69,7 +69,7 @@ inline Angle<T> Angle<T>::from_radians(T r)
 template<typename T>
 inline Angle<T> Angle<T>::from_turns(T t)
 {
-	return Angle<T>(t*2*M_PI);
+	return Angle<T>(t*6.28318530717958647692);
 }
 
 template<typename T>
@@ -155,10 +155,11 @@ inline T operator/(const Angle<T> &a1, const Angle<T> &a2)
 template<typename T>
 inline Angle<T> &Angle<T>::wrap_with_base(const Angle<T> &b)
 {
+	const float two_pi = 6.28318530717958647692;
 	while(value<b.value)
-		value += 2*M_PI;
-	while(value>=b.value+2*M_PI)
-		value -= 2*M_PI;
+		value += two_pi;
+	while(value>=b.value+two_pi)
+		value -= two_pi;
 	return *this;
 }