Added Graph::mFill flag to render flag with or without fill.

include/nanogui/graph.h

@@ -43,6 +43,9 @@ class NANOGUI_EXPORT Graph : public Widget {
     const Color &textColor() const { return mTextColor; }
     void setTextColor(const Color &textColor) { mTextColor = textColor; }
 
+    bool fill() const { return mFill; }
+    void setFill(bool fill) { mFill = fill; }
+
     const VectorXf &values() const { return mValues; }
     VectorXf &values() { return mValues; }
     void setValues(const VectorXf &values) { mValues = values; }
@@ -56,6 +59,7 @@ class NANOGUI_EXPORT Graph : public Widget {
     std::string mCaption, mHeader, mFooter;
     Color mBackgroundColor, mForegroundColor, mTextColor;
     VectorXf mValues;
+    bool mFill;
 public:
     EIGEN_MAKE_ALIGNED_OPERATOR_NEW
 };

python/misc.cpp

@@ -41,7 +41,9 @@ void register_misc(py::module &m) {
         .def("textColor", &Graph::textColor, D(Graph, textColor))
         .def("setTextColor", &Graph::setTextColor, D(Graph, setTextColor))
         .def("values", (VectorXf &(Graph::*)(void)) &Graph::values, D(Graph, values))
-        .def("setValues", &Graph::setValues, D(Graph, setValues));
+        .def("setValues", &Graph::setValues, D(Graph, setValues))
+        .def("fill", &Graph::fill, D(Graph, fill))
+        .def("setFill", &Graph::setFill, D(Graph, setFill));
 
     py::class_<ImageView, Widget, ref<ImageView>, PyImageView>(m, "ImageView", D(ImageView))
         .def(py::init<Widget *, GLuint>(), D(ImageView, ImageView))

python/py_doc.h

@@ -1041,6 +1041,10 @@ static const char *__doc_nanogui_Graph_values = R"doc()doc";
 
 static const char *__doc_nanogui_Graph_values_2 = R"doc()doc";
 
+static const char *__doc_nanogui_Graph_setFill = R"doc()doc";
+
+static const char *__doc_nanogui_Graph_fill = R"doc()doc";
+
 static const char *__doc_nanogui_GridLayout =
 R"doc(Grid layout.
 

src/graph.cpp

@@ -17,7 +17,7 @@
 NAMESPACE_BEGIN(nanogui)
 
 Graph::Graph(Widget *parent, const std::string &caption)
-    : Widget(parent), mCaption(caption) {
+    : Widget(parent), mCaption(caption), mFill(true) {
     mBackgroundColor = Color(20, 128);
     mForegroundColor = Color(255, 192, 0, 128);
     mTextColor = Color(240, 192);
@@ -48,10 +48,15 @@ void Graph::draw(NVGcontext *ctx) {
     }
 
     nvgLineTo(ctx, mPos.x() + mSize.x(), mPos.y() + mSize.y());
-    nvgStrokeColor(ctx, Color(100, 255));
-    nvgStroke(ctx);
-    nvgFillColor(ctx, mForegroundColor);
-    nvgFill(ctx);
+    if (mFill) {
+        nvgStrokeColor(ctx, Color(100, 255));
+        nvgStroke(ctx);
+        nvgFillColor(ctx, mForegroundColor);
+        nvgFill(ctx);
+    } else {
+        nvgStrokeColor(ctx, mForegroundColor);
+        nvgStroke(ctx);
+    }
 
     nvgFontFace(ctx, "sans");