Update PlottingGraphsWithMatplotlibAndUnrealEnginePython.md

Author: Roberto De Ioris

tutorials/PlottingGraphsWithMatplotlibAndUnrealEnginePython.md

@@ -57,3 +57,41 @@ ue.open_editor_for_asset(texture)
 ```
 
 ![Texture Created](https://github.com/20tab/UnrealEnginePython/blob/master/tutorials/PlottingGraphsWithMatplotlibAndUnrealEnginePython_Assets/texture_created.png)
+
+## Our project: Plotting a Pie chart tracking overlap events
+
+```python
+import unreal_engine as ue
+from unreal_engine.enums import EPixelFormat
+
+import matplotlib
+matplotlib.use('Agg')
+
+import matplotlib.pyplot as plt
+
+class PlotComponent:
+  
+    def begin_play(self):
+        width = 1024
+        height = 1024
+        dpi = 72.0
+        self.texture = ue.create_transient_texture(width, height, EPixelFormat.PF_R8G8B8A8)
+
+        self.uobject.get_owner().StaticMeshComponent.OverrideMaterials[0].set_material_texture_parameter('Graph', self.texture)
+
+        self.fig = plt.figure(1)
+        self.fig.set_dpi(dpi)
+        self.fig.set_figwidth(width/dpi)
+        self.fig.set_figheight(height/dpi)
+
+        self.uobject.get_owner().bind_event('OnGraphDataUpdated', self.update_graph)
+
+    def update_graph(self, platform):
+        # clear the current plot data
+        plt.clf()
+        # draw a pie chart        
+        plt.pie([platform.RedCubeCounter, platform.GreenCubeCounter, platform.BlueCubeCounter], colors=['r', 'g', 'b'], labels=['RedCube', 'GreenCube', 'BlueCube'], shadow=True)
+
+        self.fig.canvas.draw()
+        self.texture.texture_set_data(self.fig.canvas.buffer_rgba())
+```