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/data/tikzdocument.cpp | 5 +++++
 src/data/tikzdocument.h   | 2 ++
 src/gui/latexprocess.cpp  | 6 +++++-
 src/tikzit.cpp            | 9 ++++++++-
 4 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/data/tikzdocument.cpp b/src/data/tikzdocument.cpp
index b89da10..1099779 100644
--- a/src/data/tikzdocument.cpp
+++ b/src/data/tikzdocument.cpp
@@ -148,6 +148,11 @@ QString TikzDocument::fileName() const
     return _fileName;
 }
 
+bool TikzDocument::isEmpty()
+{
+    return _graph->nodes().isEmpty();
+}
+
 void TikzDocument::addToRecentFiles()
 {
     QSettings settings("tikzit", "tikzit");
diff --git a/src/data/tikzdocument.h b/src/data/tikzdocument.h
index 3b5990a..ad5499f 100644
--- a/src/data/tikzdocument.h
+++ b/src/data/tikzdocument.h
@@ -54,6 +54,8 @@ public:
 
     QString fileName() const;
 
+    bool isEmpty();
+
 private:
     Graph *_graph;
     QString _tikz;
diff --git a/src/gui/latexprocess.cpp b/src/gui/latexprocess.cpp
index d267bf5..8d720d5 100644
--- a/src/gui/latexprocess.cpp
+++ b/src/gui/latexprocess.cpp
@@ -38,7 +38,7 @@ LatexProcess::LatexProcess(PreviewWindow *preview, QObject *parent) : QObject(pa
     connect(_proc, SIGNAL(finished(int)), this, SLOT(finished(int)));
 
     // for debug purposes
-    _workingDir.setAutoRemove(false);
+    //_workingDir.setAutoRemove(false);
 }
 
 void LatexProcess::makePreview(QString tikz)
@@ -76,6 +76,10 @@ void LatexProcess::makePreview(QString tikz)
             // common windows tex directories
             texDirs << "C:\\Program Files\\MiKTeX 2.9\\miktex\\bin";
             texDirs << "C:\\Program Files\\MiKTeX 2.9\\miktex\\bin\\x64";
+            texDirs << "C:\\Program Files\\MiKTeX 2.8\\miktex\\bin";
+            texDirs << "C:\\Program Files\\MiKTeX 2.8\\miktex\\bin\\x64";
+            texDirs << "C:\\Program Files\\MiKTeX 2.7\\miktex\\bin";
+            texDirs << "C:\\Program Files\\MiKTeX 2.7\\miktex\\bin\\x64";
 
             _output->appendPlainText(texDirs.join(":"));
             pdflatex = QStandardPaths::findExecutable("pdflatex", texDirs);
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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