From: dooglus <dooglus@1f10aa63-cdf2-0310-b900-c93c546f37ac>
Date: Wed, 5 Mar 2008 21:50:06 +0000 (+0000)
Subject: Added a couple of comments.
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=b0d82d28d294043cd7bf90f89ac802bf2b2f71fe;p=synfig.git

Added a couple of comments.


git-svn-id: http://svn.voria.com/code@1859 1f10aa63-cdf2-0310-b900-c93c546f37ac
---

diff --git a/ETL/trunk/ETL/_curve_func.h b/ETL/trunk/ETL/_curve_func.h
index fc33402..b2898aa 100644
--- a/ETL/trunk/ETL/_curve_func.h
+++ b/ETL/trunk/ETL/_curve_func.h
@@ -36,11 +36,13 @@
 template <class T, class K=float>
 struct affine_combo
 {
+	// from (a) to (x) : x = a(1-t) + b(t)
 	T operator()(const T &a,const T &b,const K &t)const
 	{
 		return T( (b-a)*t+a );
 	}
 
+	// from (x) to (a) : a = (x-b(t)) / (1-t)
 	T reverse(const T &x, const T &b, const K &t)const
 	{
 		return T( (x-t*b)*(static_cast<K>(1)/(static_cast<K>(1)-t)) );