From: dooglus <dooglus@1f10aa63-cdf2-0310-b900-c93c546f37ac>
Date: Fri, 28 Sep 2007 02:07:33 +0000 (+0000)
Subject: Operators == and != were returning that 90 degrees != (90+360) degrees, due to floati... 
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=18bbe511c4b334ebca61b4a22662750d07521f37;p=synfig.git

Operators == and != were returning that 90 degrees != (90+360) degrees, due to floating point rounding errors.  Allow an epsilon of difference.


git-svn-id: http://svn.voria.com/code@785 1f10aa63-cdf2-0310-b900-c93c546f37ac
---

diff --git a/ETL/trunk/ETL/_angle.h b/ETL/trunk/ETL/_angle.h
index 34bc9f5..20f8261 100644
--- a/ETL/trunk/ETL/_angle.h
+++ b/ETL/trunk/ETL/_angle.h
@@ -164,14 +164,14 @@ public:
 		on the unit circle. */
 	bool
 	operator==(const angle &rhs)const
-		{ return dist(rhs).v==(value_type)0.0; }
+		{ return std::abs(dist(rhs).v)<epsilon; }
 
 	/*! Returns false if the angles
 		are refer to the same point
 		on the unit circle. */
 	bool
 	operator!=(const angle &rhs)const
-		{ return dist(rhs).v!=(value_type)0.0; }
+		{ return std::abs(dist(rhs).v)>epsilon; }
 
 	//! Angle Difference Function
 	/*! This function will return the
@@ -232,6 +232,8 @@ private:
 	static value_type rot_floor(value_type x)
 	{ return static_cast<value_type>(std::floor(x/(PI*2))*PI*2); }
 
+	static const value_type epsilon = 1.0e-6;
+
 public:
 	/*
 	** Conversion Classes