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- Add translation support.

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Daniel Belcher 2019-04-12 14:22:39 -07:00
commit 408a0d81ac
1 changed files with 45 additions and 17 deletions
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62
src/GraphControl/Control/Grapher.cpp
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@ -49,7 +49,11 @@ namespace GraphControl
this->Unloaded += ref new RoutedEventHandler(this, &Grapher::OnUnloaded);
m_gestureRecognizer->GestureSettings =
GestureSettings::ManipulationScale;
GestureSettings::ManipulationTranslateX |
GestureSettings::ManipulationTranslateY |
GestureSettings::ManipulationTranslateInertia |
GestureSettings::ManipulationScale |
GestureSettings::ManipulationScaleInertia;
m_gestureRecognizer->ManipulationUpdated += ref new TypedEventHandler<GestureRecognizer^, ManipulationUpdatedEventArgs^>(this, &Grapher::OnGestureManipulationUpdated);
}
@ -467,26 +471,50 @@ namespace GraphControl
void Grapher::OnGestureManipulationUpdated(GestureRecognizer^ sender, ManipulationUpdatedEventArgs^ args)
{
const double width = ActualWidth;
const double height = ActualHeight;
if (double scale = args->Delta.Scale; scale != 1.0)
if (m_graph)
{
// The graphing engine interprets scale amounts as the inverse of the value retrieved
// from the ManipulationUpdatedEventArgs. Invert the scale amount for the engine.
scale = 1.0 / scale;
if (auto renderer = m_graph->GetRenderer())
{
const double width = ActualWidth;
const double height = ActualHeight;
// Add a minor amplification effect to the scale gesture.
constexpr double amplification = 1.05;
scale *= (scale > 1) ? amplification : 1.0 / amplification;
const auto& translation = args->Delta.Translation;;
double translationX = translation.X;
double translationY = translation.Y;
if (translationX != 0 || translation.Y != 0)
{
// The graphing engine pans the graph according to a ratio for x and y.
// A value of +1 means move a half screen in the positive direction for the given axis.
// Convert the manipulation's translation values to ratios for the engine.
translationX /= -width;
translationY /= height;
// The graphing engine interprets x,y position between the range [-1, 1].
// Translate the pointer position to the [-1, 1] bounds.
const auto& pos = args->Position;
double centerX = 2 * pos.X / width - 1;
double centerY = 1 - 2 * pos.Y / height;
if (FAILED(renderer->MoveRangeByRatio(translationX, translationY)))
{
return;
}
}
ScaleRange(centerX, centerY, scale);
if (double scale = args->Delta.Scale; scale != 1.0)
{
// The graphing engine interprets scale amounts as the inverse of the value retrieved
// from the ManipulationUpdatedEventArgs. Invert the scale amount for the engine.
scale = 1.0 / scale;
// The graphing engine interprets x,y position between the range [-1, 1].
// Translate the pointer position to the [-1, 1] bounds.
const auto& pos = args->Position;
double centerX = 2 * pos.X / width - 1;
double centerY = 1 - 2 * pos.Y / height;
if (FAILED(renderer->ScaleRange(centerX, centerY, scale)))
{
return;
}
}
m_renderMain->RunRenderPass();
}
}
}
}