From 5134b522ae56a9d222076b50dcb8f7394e88c97c Mon Sep 17 00:00:00 2001
From: Hannes Janetzek <hannes.janetzek@gmail.com>
Date: Mon, 24 Feb 2014 16:59:36 +0100
Subject: [PATCH] LineLayer: drop invalid lines

---
 vtm/src/org/oscim/renderer/elements/LineLayer.java | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/vtm/src/org/oscim/renderer/elements/LineLayer.java b/vtm/src/org/oscim/renderer/elements/LineLayer.java
index 60a79984..197944f1 100644
--- a/vtm/src/org/oscim/renderer/elements/LineLayer.java
+++ b/vtm/src/org/oscim/renderer/elements/LineLayer.java
@@ -169,7 +169,17 @@ public final class LineLayer extends RenderElement {
 			if (length < 4)
 				continue;
 
+			/* start an enpoint are equal */
+			if (length == 4 &&
+			        points[ipos] == points[ipos + 2] &&
+			        points[ipos + 1] == points[ipos + 3])
+				continue;
 
+			/* avoid simple 180 degree angles */
+			if (length == 6 &&
+			        points[ipos] == points[ipos + 4] &&
+			        points[ipos + 1] == points[ipos + 5])
+				length -= 2;
 
 			vertexItem = addLine(vertexItem, points, ipos, length, rounded, squared, closed);