private void DoWhenEventTypeSingleTap(ARHitResult hitResult)
{
// The hit results are sorted by distance. Only the nearest hit point is valid.
// Set the number of stored objects to 10 to avoid the overload of rendering and AR Engine.
if (mVirtualObjects.Count >= 16)
{
mVirtualObjects.ElementAt(0).GetAnchor().Detach();
mVirtualObjects.RemoveAt(0);
}
IARTrackable currentTrackable = hitResult.Trackable;
Java.Lang.Object PointOrPlane = null;
bool isPlanHitJudge = false;
bool isPointHitJudge = false;
try
{
PointOrPlane = currentTrackable.JavaCast <ARPlane>();
isPlanHitJudge = PointOrPlane.GetType() == typeof(ARPlane);
}
catch (Exception e)
{
PointOrPlane = currentTrackable.JavaCast <ARPoint>();
isPointHitJudge = PointOrPlane.GetType() == typeof(ARPoint);
};
if (isPointHitJudge)
{
mVirtualObjects.Add(new VirtualObject(hitResult.CreateAnchor(), BLUE_COLORS));
}
else if (isPlanHitJudge)
{
mVirtualObjects.Add(new VirtualObject(hitResult.CreateAnchor(), GREEN_COLORS));
}
else
{
Log.Info(TAG, "Hit result is not plane or point.");
}
}
private void HandleGestureEvent(ARFrame arFrame, ARCamera arCamera, float[] projectionMatrix, float[] viewMatrix)
{
GestureEvent mEvent = mQueuedSingleTaps.Poll().JavaCast <GestureEvent>();
if (mEvent == null)
{
return;
}
// Do not perform anything when the object is not tracked.
if (arCamera.TrackingState != ARTrackableTrackingState.Tracking)
{
return;
}
int eventType = mEvent.GetType();
switch (eventType)
{
case GestureEvent.GESTURE_EVENT_TYPE_DOUBLETAP:
DoWhenEventTypeDoubleTap(viewMatrix, projectionMatrix, mEvent);
break;
case GestureEvent.GESTURE_EVENT_TYPE_SCROLL:
{
if (mSelectedObj == null)
{
break;
}
ARHitResult hitResult = HitTest4Result(arFrame, arCamera, mEvent.GetEventSecond());
if (hitResult != null)
{
mSelectedObj.SetAnchor(hitResult.CreateAnchor());
}
break;
}
case GestureEvent.GESTURE_EVENT_TYPE_SINGLETAPCONFIRMED:
{
// Do not perform anything when an object is selected.
if (mSelectedObj != null)
{
mSelectedObj.SetIsSelected(false);
mSelectedObj = null;
}
MotionEvent tap = mEvent.GetEventFirst();
ARHitResult hitResult = null;
hitResult = HitTest4Result(arFrame, arCamera, tap);
if (hitResult == null)
{
break;
}
DoWhenEventTypeSingleTap(hitResult);
break;
}
default:
Log.Info(TAG, "Unknown motion event type, and do nothing.");
break;
}
}
