From 9c9b1810b76c81f4ed62fda35c6f6f3439a26783 Mon Sep 17 00:00:00 2001
From: vrld <vrld@vrld.org>
Date: Fri, 30 Dec 2011 14:09:26 +0100
Subject: [PATCH] Decrese core-line width when overdrawing to preserve original
 line width.

---
 src/modules/graphics/opengl/Graphics.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/modules/graphics/opengl/Graphics.cpp b/src/modules/graphics/opengl/Graphics.cpp
index ce9068343..814f32efa 100644
--- a/src/modules/graphics/opengl/Graphics.cpp
+++ b/src/modules/graphics/opengl/Graphics.cpp
@@ -859,6 +859,11 @@ namespace opengl
 		float halfwidth = lineWidth/2.f;
 		float inv_hw    = 1.f / halfwidth;
 
+		// Overdraw changes visible line width. account for that.
+		// Value of 0.15 chosen empirically.
+		if (lineStyle == LINE_SMOOTH)
+			halfwidth -= .15f;
+
 		// get line vertex boundaries
 		// if not looping, extend the line at the beginning, else use last point as `p'
 		r = Vector(coords[0], coords[1]);