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- Mouse wheel can be used to zoom in/out of the graph.

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This commit is contained in:
Daniel Belcher 2019-04-01 17:20:21 -07:00
commit c5bd06af90
2 changed files with 31 additions and 2 deletions
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28
src/GraphControl/Control/Grapher.cpp
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@ -417,4 +417,32 @@ namespace GraphControl
e->Handled = true;
}
}
void Grapher::OnPointerWheelChanged(PointerRoutedEventArgs^ args)
{
PointerPoint^ currentPointer = args->GetCurrentPoint(/*relative to*/ this);
double delta = currentPointer->Properties->MouseWheelDelta;
// The maximum delta is 120 according to:
// https://docs.microsoft.com/en-us/uwp/api/windows.ui.input.pointerpointproperties.mousewheeldelta#Windows_UI_Input_PointerPointProperties_MouseWheelDelta
// Apply a dampening effect so that small mouse movements have a smoother zoom.
constexpr double scrollDamper = 0.15;
double scale = 1.0 + (abs(delta) / WHEEL_DELTA) * scrollDamper;
// positive delta if wheel scrolled away from the user
if (delta >= 0)
{
scale = 1.0 / scale;
}
// For scaling, the graphing engine interprets x,y position between the range [-1, 1].
// Translate the pointer position to the [-1, 1] bounds.
double centerX = (currentPointer->Position.X - ActualWidth / 2) / (ActualWidth / 2);
double centerY = (ActualHeight / 2 - currentPointer->Position.Y) / (ActualHeight / 2);
ScaleRange(centerX, centerY, scale);
args->Handled = true;
}
}

5
src/GraphControl/Control/Grapher.h
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@ -110,6 +110,7 @@ namespace GraphControl
void OnPointerEntered(Windows::UI::Xaml::Input::PointerRoutedEventArgs^ e) override;
void OnPointerMoved(Windows::UI::Xaml::Input::PointerRoutedEventArgs^ e) override;
void OnPointerExited(Windows::UI::Xaml::Input::PointerRoutedEventArgs^ e) override;
void OnPointerWheelChanged(Windows::UI::Xaml::Input::PointerRoutedEventArgs^ e) override;
#pragma endregion
private:
@ -125,6 +126,7 @@ namespace GraphControl
void OnDataSourceChanged(GraphControl::InspectingDataSource^ sender, GraphControl::DataSourceChangedEventArgs args);
void OnEquationsChanged(Windows::UI::Xaml::DependencyPropertyChangedEventArgs^ args);
void OnEquationsVectorChanged(Windows::Foundation::Collections::IObservableVector<GraphControl::Equation ^> ^sender, Windows::Foundation::Collections::IVectorChangedEventArgs ^event);
void OnEquationChanged();
void UpdateGraph();
@ -158,6 +160,5 @@ namespace GraphControl
const std::unique_ptr<Graphing::IMathSolver> m_solver;
const std::shared_ptr<Graphing::IGraph> m_graph;
void OnEquationsVectorChanged(Windows::Foundation::Collections::IObservableVector<GraphControl::Equation ^> ^sender, Windows::Foundation::Collections::IVectorChangedEventArgs ^event);
};
};
}