From 441af1a4d057a9f7924394dd4dc537fa21418e38 Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Tue, 7 Jun 2016 23:32:44 -0400
Subject: [PATCH] CmdChart: Intervals now used rounded up/down time, not just
 rounded down time

---
 src/commands/CmdChart.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/commands/CmdChart.cpp b/src/commands/CmdChart.cpp
index e8eaf7b1..edc3792e 100644
--- a/src/commands/CmdChart.cpp
+++ b/src/commands/CmdChart.cpp
@@ -470,8 +470,11 @@ static void renderInterval (
 
   work = clipped.range.total ();
 
-  int start_offset = (start_mins / 15) + (spacing * (start_mins / 60));
-  int end_offset   = (end_mins   / 15) + (spacing * (end_mins   / 60));
+  auto start_block = quantizeTo15Minutes (start_mins) / 15;
+  auto end_block   = quantizeTo15Minutes (end_mins == 0 ? 60 : end_mins) / 15;
+
+  int start_offset = start_block + (spacing * (start_mins / 60));
+  int end_offset   = end_block   + (spacing * (end_mins   / 60));
 
   if (end_offset > start_offset)
   {