Adds zoom buttons to graph controls (#637)

src/GraphControl/Control/Grapher.cpp

@@ -92,6 +92,11 @@ namespace GraphControl
         }
     }
 
+    void Grapher::ZoomFromCenter(double scale)
+    {
+        ScaleRange(0, 0, scale);
+    }
+
     void Grapher::ScaleRange(double centerX, double centerY, double scale)
     {
         if (m_graph != nullptr && m_renderMain != nullptr)
@@ -106,6 +111,20 @@ namespace GraphControl
         }
     }
 
+    void Grapher::ResetGrid()
+    {
+        if (m_graph != nullptr && m_renderMain != nullptr)
+        {
+            if (auto renderer = m_graph->GetRenderer())
+            {
+                if (SUCCEEDED(renderer->ResetRange()))
+                {
+                    m_renderMain->RunRenderPass();
+                }
+            }
+        }
+    }
+
     void Grapher::OnApplyTemplate()
     {
         auto swapChainPanel = dynamic_cast<SwapChainPanel^>(GetTemplateChild(StringReference(s_templateKey_SwapChainPanel)));

src/GraphControl/Control/Grapher.h

@@ -127,6 +127,8 @@ namespace GraphControl
         event Windows::Foundation::EventHandler<Windows::Foundation::Collections::IMap<Platform::String^, double>^>^ VariablesUpdated;
 
         void SetVariable(Platform::String^ variableName, double newValue);
+        void ZoomFromCenter(double scale);
+        void ResetGrid();
 
     protected:
         #pragma region Control Overrides