Allow for choice of font for Graph Editor

documents/DeveloperGuide/GraphEditor.md

@@ -75,6 +75,8 @@ The following are common command-line options for MaterialXGraphEditor, and a co
 - `--path [FILEPATH]` : Specify an additional data search path location (e.g. '/projects/MaterialX').  This absolute path will be queried when locating data libraries, XInclude references, and referenced images.
 - `--library [FILEPATH]` : Specify an additional data library folder (e.g. 'vendorlib', 'studiolib').  This relative path will be appended to each location in the data search path when loading data libraries.
 - `--captureFilename [FILENAME]` : Specify the filename to which the first rendered frame should be written
+- `--font [FILE]` : Specify the name of the custom font file to use. If not specified the default font will be used"
+- `--fontSize [SIZE]` : Specify font size to use for the custom font. If not specified a default of 18 will be used"
 
 ## Known Limitations
 

source/MaterialXGraphEditor/Main.cpp

@@ -31,6 +31,8 @@ const std::string options =
     "    --library [FILEPATH]           Specify an additional data library folder (e.g. 'vendorlib', 'studiolib').  This relative path will be appended to each location in the data search path when loading data libraries.\n"
     "    --uiScale [FACTOR]             Manually specify a UI scaling factor\n"
     "    --captureFilename [FILENAME]   Specify the filename to which the first rendered frame should be written\n"
+    "    --font [FILE]                  Specify the name of the custom font file to use. If not specified the default font will be used\n"
+    "    --fontSize [SIZE]              Specify font size to use for the custom font. If not specified a default of 18 will be used\n"
     "    --help                         Display the complete list of command-line options\n";
 
 template <class T> void parseToken(std::string token, std::string type, T& res)
@@ -68,6 +70,8 @@ int main(int argc, char* const argv[])
     int viewHeight = 256;
     float uiScale = 0.0f;
     std::string captureFilename;
+    std::string fontFilename;
+    int fontSize = 18;
 
     for (size_t i = 0; i < tokens.size(); i++)
     {
@@ -106,6 +110,18 @@ int main(int argc, char* const argv[])
         {
             parseToken(nextToken, "string", captureFilename);
         }
+        else if (token == "--font")
+        {
+            parseToken(nextToken, "string", fontFilename);
+        }
+        else if (token == "--fontSize")
+        {
+            parseToken(nextToken, "integer", fontSize);
+            if (fontSize < 12)
+            {
+                fontSize = 12;
+            }
+        }
         else if (token == "--help")
         {
             std::cout << " MaterialXGraphEditor version " << mx::getVersionString() << std::endl;
@@ -172,7 +188,15 @@ int main(int argc, char* const argv[])
     io.IniFilename = NULL;
     io.LogFilename = NULL;
 
-    io.Fonts->AddFontDefault();
+    ImFont* customFont = nullptr;
+    if (!fontFilename.empty())
+    {
+        customFont = io.Fonts->AddFontFromFileTTF(fontFilename.c_str(), fontSize);
+    }
+    if (!customFont)
+    {
+        io.Fonts->AddFontDefault();
+    }
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();