From 04f101d24f7a9c52d0c7880e0b30e996291f13bb Mon Sep 17 00:00:00 2001
From: Hombre <natureh@free.fr>
Date: Sat, 16 Oct 2010 00:03:15 +0200
Subject: [PATCH] Little optimization of the NURBS curves algorithm

---
 rtengine/curves.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/rtengine/curves.cc b/rtengine/curves.cc
index 6922441d4..baccb69f8 100644
--- a/rtengine/curves.cc
+++ b/rtengine/curves.cc
@@ -120,6 +120,8 @@ void Curve::NURBS_set () {
     int k = 0;
     for (int i = 0; i < N-1;) {
         double length;
+        double dx;
+        double dy;
 
     	// first point (on the curve)
     	if (!i) {
@@ -146,7 +148,9 @@ void Curve::NURBS_set () {
 			sc_x[j] =  (x[i-1] + x[i]) / 2.;
 			sc_y[j] =  (y[i-1] + y[i]) / 2.;
 		}
-		length += sqrt(pow(sc_x[j] - sc_x[j-1],2) + pow(sc_y[j] - sc_y[j-1],2));
+		dx = sc_x[j] - sc_x[j-1];
+		dy = sc_y[j] - sc_y[j-1];
+		length += sqrt(dx*dx + dy*dy);
 		j++;
 
 		// Storing the length of all sub-curves and the total length (to have a better distribution