public override void TouchesMoved(Foundation.NSSet touches, UIEvent evt)
{
base.TouchesMoved(touches, evt);
var touch = touches.First() as UITouch;
if (touch == null)
{
return;
}
var bounds = Bounds.Ceiling();
UIGraphics.BeginImageContextWithOptions(bounds.Size, false, 0);
var context = UIGraphics.GetCurrentContext();
DrawingImage?.Draw(bounds);
var allTouches = new List <UITouch> ();
var coalescedTouches = evt.GetCoalescedTouches(touch);
if (coalescedTouches != null)
{
allTouches = coalescedTouches.ToList();
}
else
{
allTouches.Append(touch);
}
foreach (var unused in touches)
{
DrawStroke(context, touch);
}
// 1
DrawingImage = UIGraphics.GetImageFromCurrentImageContext();
var predictedTouches = evt.GetPredictedTouches(touch);
foreach (var t in predictedTouches)
{
DrawStroke(context, t);
}
Image = UIGraphics.GetImageFromCurrentImageContext();
// Update image
UIGraphics.EndImageContext();
}