private void ProcessTouchEvent(long id, MotionEventActions type, SKPoint location)
{
switch (type)
{
case MotionEventActions.Down:
case MotionEventActions.Pointer2Down:
case MotionEventActions.Pointer1Down:
touchDictionary.Add(id, new TouchManipulationInfo
{
PreviousPoint = location,
NewPoint = location
});
break;
case MotionEventActions.Move:
TouchManipulationInfo info = touchDictionary[id];
info.NewPoint = location;
Manipulate();
info.PreviousPoint = info.NewPoint;
break;
case MotionEventActions.Up:
case MotionEventActions.Pointer2Up:
case MotionEventActions.Pointer1Up:
touchDictionary[id].NewPoint = location;
//Manipulate();
touchDictionary.Remove(id);
break;
case MotionEventActions.Cancel:
touchDictionary.Remove(id);
break;
}
}
private void Manipulate()
{
TouchManipulationInfo[] infos = new TouchManipulationInfo[touchDictionary.Count];
touchDictionary.Values.CopyTo(infos, 0);
SKMatrix touchMatrix = SKMatrix.MakeIdentity();
if (infos.Length == 1)
{
SKPoint prevPoint = infos[0].PreviousPoint;
SKPoint newPoint = infos[0].NewPoint;
SKPoint pivotPoint = Matrix.MapPoint(_info.Width / 2, _info.Height / 2);
OneFingerManipulate(prevPoint, newPoint, pivotPoint);
}
else if (infos.Length >= 2)
{
int pivotIndex = infos[0].NewPoint == infos[0].PreviousPoint ? 0 : 1;
SKPoint pivotPoint = Matrix.MapPoint(_info.Width / 2, _info.Height / 2);
SKPoint newPoint = infos[1 - pivotIndex].NewPoint;
SKPoint prevPoint = infos[1 - pivotIndex].PreviousPoint;
TwoFingerManipulate(prevPoint, newPoint, pivotPoint);
}
}