From f476e68dc61898cc0285975d2b674a59a40de46a Mon Sep 17 00:00:00 2001
From: Alexander Borsuk <me@alex.bio>
Date: Thu, 26 Aug 2021 00:01:38 +0200
Subject: [PATCH] Fixed rounding error in the height chart

Signed-off-by: Alexander Borsuk <me@alex.bio>
---
 map/chart_generator.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/map/chart_generator.cpp b/map/chart_generator.cpp
index e892ba47fd..bbbd9898f9 100644
--- a/map/chart_generator.cpp
+++ b/map/chart_generator.cpp
@@ -188,8 +188,8 @@ bool GenerateYAxisChartData(uint32_t height, double minMetersPerPxl,
     LOG(LERROR, ("metersPerPxl == 0.0"));
     return false;
   }
-
-  double const deltaAltPxl = deltaAltM / metersPerPxl;
+  // int avoids double errors which make freeHeightSpacePxl slightly less than zero.
+  int const deltaAltPxl = deltaAltM / metersPerPxl;
   double const freeHeightSpacePxl = drawHeightPxl - deltaAltPxl;
   if (freeHeightSpacePxl < 0 || freeHeightSpacePxl > drawHeightPxl)
   {