From 6fd94bf97d9f6f6263262d7dd23f8f2c2e33d796 Mon Sep 17 00:00:00 2001
From: Aleks Kissinger <aleks0@gmail.com>
Date: Sun, 6 Jan 2019 15:15:50 +0100
Subject: add a blank node when previewing empty graph

---
 src/tikzit.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/tikzit.cpp')

diff --git a/src/tikzit.cpp b/src/tikzit.cpp
index 2a7c00a..06777d1 100644
--- a/src/tikzit.cpp
+++ b/src/tikzit.cpp
@@ -429,7 +429,14 @@ void Tikzit::makePreview()
         }
 
         connect(_latex, SIGNAL(previewFinished()), this, SLOT(cleanupLatex()));
-        _latex->makePreview(activeWindow()->tikzSource());
+
+        if (activeWindow()->tikzDocument()->isEmpty()) {
+            _latex->makePreview("\\begin{tikzpicture}\n"
+                                "  \\node [style=none] (0) at (0,0) {};\n"
+                                "\\end{tikzpicture}\n");
+        } else {
+            _latex->makePreview(activeWindow()->tikzSource());
+        }
         _preview->show();
     }
 }
-- 
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