From 0ccde088a78a8eb40e03007034ab6b5f24d3508d Mon Sep 17 00:00:00 2001
From: George Wu <uiharu@buaa.edu.cn>
Date: Tue, 25 Oct 2016 21:52:45 +0200
Subject: [PATCH] [director] Fixed a crash when zooming too fast.

---
 .../UI/Controls/ScoreBar.Rendering.cs                         | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/DereTore.Applications.StarlightDirector/UI/Controls/ScoreBar.Rendering.cs b/DereTore.Applications.StarlightDirector/UI/Controls/ScoreBar.Rendering.cs
index f28e29b..76e245c 100644
--- a/DereTore.Applications.StarlightDirector/UI/Controls/ScoreBar.Rendering.cs
+++ b/DereTore.Applications.StarlightDirector/UI/Controls/ScoreBar.Rendering.cs
@@ -42,6 +42,10 @@ private void DrawBar(DrawingContext context) {
             var visibleGridCountPerSignature = gridPerSignature / zoomMod;
             var hasPartialGrids = visibleGridCountPerSignature * zoomMod != gridPerSignature;
 
+            if (visibleGridCountPerSignature <= 0) {
+                return;
+            }
+
             for (var i = 0; i <= totalGridCount; ++i) {
                 if (i % zoomMod != 0 && i != totalGridCount) {
                     // Only draws key beats.