- Expose ScaleRange from the UI

src/Calculator/Views/GraphingCalculator/GraphingCalculator.xaml

@@ -25,7 +25,8 @@
               Grid.Row="1"
               Grid.Column="0">
 
-            <graphControl:Grapher Grid.Row="0"
+            <graphControl:Grapher x:Name="Graph"
+                                  Grid.Row="0"
                                   Margin="4,7,4,4"
                                   EquationsSource="{x:Bind ViewModel.Equations, Mode=OneWay}"
                                   ForceProportionalAxes="True"
@@ -49,13 +50,38 @@
               Margin="4,0,4,0">
             <Grid.RowDefinitions>
                 <RowDefinition Height="5*"/>
+                <RowDefinition Height="Auto"/>
                 <RowDefinition Height="3*"/>
             </Grid.RowDefinitions>
 
             <local:EquationInputArea Grid.Row="0" Equations="{x:Bind ViewModel.Equations}"/>
 
+            <StackPanel Grid.Row="1" Orientation="Vertical">
+                <TextBlock Text="Scale Range"/>
+                <Grid>
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition/>
+                        <ColumnDefinition/>
+                        <ColumnDefinition/>
+                    </Grid.ColumnDefinitions>
+
+                    <TextBox x:Name="CenterXTextBox"
+                             Grid.Column="0"
+                             KeyDown="ScaleRangeTextBox_KeyDown"
+                             PlaceholderText="CenterX"/>
+                    <TextBox x:Name="CenterYTextBox"
+                             Grid.Column="1"
+                             KeyDown="ScaleRangeTextBox_KeyDown"
+                             PlaceholderText="CenterY"/>
+                    <TextBox x:Name="ScaleTextBox"
+                             Grid.Column="2"
+                             KeyDown="ScaleRangeTextBox_KeyDown"
+                             PlaceholderText="Scale"/>
+                </Grid>
+            </StackPanel>
+
             <Grid x:Name="ButtonContainerGrid"
-                  Grid.Row="1"
+                  Grid.Row="2"
                   Margin="3,0,3,3"
                   UseLayoutRounding="False">
                 <Grid.RowDefinitions>

src/Calculator/Views/GraphingCalculator/GraphingCalculator.xaml.cpp

@@ -11,12 +11,14 @@ using namespace CalculatorApp::ViewModel;
 using namespace concurrency;
 using namespace GraphControl;
 using namespace Platform;
+using namespace std;
 using namespace std::chrono;
 using namespace Utils;
 using namespace Windows::Foundation::Collections;
 using namespace Windows::Storage::Streams;
 using namespace Windows::System;
 using namespace Windows::UI::Xaml;
+using namespace Windows::UI::Xaml::Controls;
 using namespace Windows::UI::Xaml::Data;
 using namespace Windows::UI::Xaml::Input;
 using namespace Windows::UI::Xaml::Media;
@@ -49,3 +51,23 @@ void GraphingCalculator::ViewModel::set(GraphingCalculatorViewModel^ vm)
         RaisePropertyChanged(StringReference(sc_ViewModelPropertyName));
     }
 }
+
+void GraphingCalculator::ScaleRangeTextBox_KeyDown(Object^ sender, KeyRoutedEventArgs^ e)
+{
+    if (e->Key == VirtualKey::Enter)
+    {
+        auto valFromTB = [](TextBox^ tb)
+        {
+            wstring text = tb->Text->Data();
+            return stod(text);
+        };
+
+        double centerX = valFromTB(CenterXTextBox);
+        double centerY = valFromTB(CenterYTextBox);
+        double scale = valFromTB(ScaleTextBox);
+
+        Graph->ScaleRange(centerX, centerY, scale);
+
+        e->Handled = true;
+    }
+}

src/Calculator/Views/GraphingCalculator/GraphingCalculator.xaml.h

@@ -22,6 +22,8 @@ namespace CalculatorApp
     private:
         void GraphingCalculator_DataContextChanged(Windows::UI::Xaml::FrameworkElement^ sender, Windows::UI::Xaml::DataContextChangedEventArgs^ args);
 
+        void ScaleRangeTextBox_KeyDown(Platform::Object^ sender, Windows::UI::Xaml::Input::KeyRoutedEventArgs^ e);
+
     private:
         CalculatorApp::ViewModel::GraphingCalculatorViewModel^ m_viewModel;
     };

src/GraphControl/Control/Grapher.cpp

@@ -66,6 +66,20 @@ namespace GraphControl
         }
     }
 
+    void Grapher::ScaleRange(double centerX, double centerY, double scale)
+    {
+        if (m_graph)
+        {
+            if (auto renderer = m_graph->GetRenderer())
+            {
+                if (SUCCEEDED(renderer->ScaleRange(centerX, centerY, scale)))
+                {
+                    m_renderMain->RunRenderPass();
+                }
+            }
+        }
+    }
+
     void Grapher::OnApplyTemplate()
     {
         auto swapChainPanel = dynamic_cast<SwapChainPanel^>(GetTemplateChild(StringReference(s_templateKey_SwapChainPanel)));

src/GraphControl/Control/Grapher.h

@@ -100,6 +100,8 @@ namespace GraphControl
         }
         #pragma endregion
 
+        void ScaleRange(double centerX, double centerY, double scale);
+
     protected:
         #pragma region Control Overrides
         void OnApplyTemplate() override;