/// <summary>
/// Calculates the ViewPortTransfrom for the Current Heading and ViewPortCenter.
/// Invalidates the ViewPort to schedule a redraw.
/// </summary>
protected virtual void UpdateViewPortTransform()
{
if (ViewPortTransform == null)
{
return;
}
double scaleFactor = ViewPortProjection.GetZoomFactor(ZoomLevel);
double w2 = ActualWidth / 2d;
double h2 = ActualHeight / 2d;
MatrixDouble vpCenterTranslation = MatrixDouble.CreateTranslation(w2, h2);
MatrixDouble scale = MatrixDouble.CreateScale(scaleFactor);
MatrixDouble mapCenterTranslation = MatrixDouble.CreateTranslation(-ViewPortCenter.X, -ViewPortCenter.Y);
double heading = Heading * Math.PI / 180.0;
Point center = new Point(ViewPortCenter.X, ViewPortCenter.Y);
MatrixDouble mapRotation = MatrixDouble.CreateRotation(heading, center);
MatrixDouble objectRotation = MatrixDouble.CreateRotation(heading);
ViewPortTransform.Matrix = (mapRotation * mapCenterTranslation * scale * vpCenterTranslation).ToXamlMatrix();
ScaleRotateTransform.Matrix = (objectRotation * scale).ToXamlMatrix();
ScaleTransform.Matrix = scale.ToXamlMatrix();
RotateTransform.Matrix = objectRotation.ToXamlMatrix();
TranslationTransform.Matrix = (mapCenterTranslation * vpCenterTranslation).ToXamlMatrix();
InvalidateArrange();
OnViewPortChangedEvent();
}
public CartesianPoint GetCartesianFromPoint(Point point)
{
double zoomFactor = 1 / ViewPortProjection.GetZoomFactor(ZoomLevel);
double x = (point.X - RenderSize.Width / 2d) * zoomFactor + ViewPortCenter.X;
double y = (point.Y - RenderSize.Height / 2d) * zoomFactor + ViewPortCenter.Y;
MatrixDouble reverseRotationMatrix = MatrixDouble.CreateRotation(-TransformHelper.DegToRad(Heading), ViewPortCenter.ToPoint());
return(new CartesianPoint(reverseRotationMatrix.Transform(new Point(x, y))));
}
private void OnManipulationStarted(object sender, ManipulationStartedRoutedEventArgs e)
{
_headingBeforeManipulation = _map.Heading;
_zoomFactorBeforeManipulation = _map.ViewPortProjection.GetZoomFactor(_map.ZoomLevel);
_viewPortCenterBeforeManipulation = _map.ViewPortCenter.ToPoint();
_reverseRotationMatrix = MatrixDouble.CreateRotation(-TransformHelper.DegToRad(_headingBeforeManipulation), _viewPortCenterBeforeManipulation);
_manipulationStartPoint = _map.GetCartesianFromPoint(e.Position).ToPoint();
e.Handled = true;
}
protected virtual void UpdateManipulation(ManipulationDelta delta)
{
double newHeading = _headingBeforeManipulation;
double newZoomFact = _zoomFactorBeforeManipulation * delta.Scale;
MatrixDouble m = MatrixDouble.Identity;
if (TranslationEnabled)
{
m = MatrixDouble.CreateTranslation(-(delta.Translation.X / _zoomFactorBeforeManipulation), -(delta.Translation.Y / _zoomFactorBeforeManipulation));
m = m * _reverseRotationMatrix;
}
if (ZoomEnabled)
{
double scaleFactor = _zoomFactorBeforeManipulation / newZoomFact;
m = m * MatrixDouble.CreateScale(scaleFactor, _manipulationStartPoint);
}
if ((delta.Rotation != 0.0) && RotationEnabled)
{
//Add the Rotation from the Manipulation
MatrixDouble rotation = MatrixDouble.CreateRotation(-TransformHelper.DegToRad(delta.Rotation), _manipulationStartPoint);
m = m * rotation;
newHeading = (_headingBeforeManipulation + delta.Rotation) % 360;
if (newHeading < 0)
{
newHeading += 360;
}
}
double zoomLevel = _map.ViewPortProjection.GetZoomLevel(newZoomFact);
CartesianPoint viewPortCenter = new CartesianPoint(m.Transform(_viewPortCenterBeforeManipulation));
if (Update != null)
{
TouchMapEventArgs eventArgs = new TouchMapEventArgs();
eventArgs.Heading = newHeading;
eventArgs.ZoomLevel = zoomLevel;
eventArgs.ViewPortCenter = viewPortCenter;
OnUpdate(eventArgs);
}
if (AutoUpdateMap)
{
_map.Heading = newHeading;
_map.ZoomLevel = zoomLevel;
_map.ViewPortCenter = viewPortCenter;
}
}
