void HandlePan(WKPanGestureRecognizer panGesture)
{
if (!gameNodes.HasValue || !gameStarted)
{
return;
}
var gNodes = gameNodes.Value;
var location = panGesture.LocationInObject;
var bounds = panGesture.ObjectBounds;
// Compute the projection of the interface point to the virtual trackball.
var sphereLocation = SphereProjection(location, bounds);
switch (panGesture.State)
{
case WKGestureRecognizerState.Began:
// Record initial states.
initialSphereLocation = sphereLocation;
initialObject3DRotation = gNodes.Object.Transform;
break;
case WKGestureRecognizerState.Cancelled:
case WKGestureRecognizerState.Ended:
case WKGestureRecognizerState.Changed:
// Compute the rotation and apply to the object.
var currentRotation = RotationFromPoint(initialSphereLocation, sphereLocation);
gNodes.Object.Transform = SCNMatrix4.Mult(initialObject3DRotation, currentRotation);
break;
default:
Console.WriteLine($"Unhandled gesture state: {panGesture.State}");
throw new InvalidProgramException();
}
// End the game if the object has the initial orientation.
if (panGesture.State == WKGestureRecognizerState.Ended)
{
EndGameOnCorrectOrientation();
}
}
void HandlePan (WKPanGestureRecognizer panGesture)
{
if (!gameNodes.HasValue || !gameStarted)
return;
var gNodes = gameNodes.Value;
var location = panGesture.LocationInObject;
var bounds = panGesture.ObjectBounds;
// Compute the projection of the interface point to the virtual trackball.
var sphereLocation = SphereProjection (location, bounds);
switch (panGesture.State) {
case WKGestureRecognizerState.Began:
// Record initial states.
initialSphereLocation = sphereLocation;
initialObject3DRotation = gNodes.Object.Transform;
break;
case WKGestureRecognizerState.Cancelled:
case WKGestureRecognizerState.Ended:
case WKGestureRecognizerState.Changed:
// Compute the rotation and apply to the object.
var currentRotation = RotationFromPoint (initialSphereLocation, sphereLocation);
gNodes.Object.Transform = SCNMatrix4.Mult (initialObject3DRotation, currentRotation);
break;
default:
Console.WriteLine ($"Unhandled gesture state: {panGesture.State}");
throw new InvalidProgramException ();
}
// End the game if the object has the initial orientation.
if (panGesture.State == WKGestureRecognizerState.Ended)
EndGameOnCorrectOrientation ();
}
