public void RaisePointerEvent(NSSet touches, PointerEventArgs.PointerEventType Type, bool PointerDown)
{
var touch = (UITouch)touches.AnyObject;
PreviousPoint = touch.PreviousLocationInView(this);
var newPoint = touch.LocationInView(this);
InvokeOnMainThread(SetNeedsDisplay);
PointerEvent?.Invoke(this, new PointerEventArgs(Type,
PreviousPoint.ToPoint(), newPoint.ToPoint(), PointerDown));
}
public override void TouchesMoved(NSSet touches, UIEvent evt)
{
var touch = (UITouch)touches.AnyObject;
var currentPoint = touch.LocationInView(this);
if (Math.Abs(currentPoint.X - PreviousPoint.X) >= 4 ||
Math.Abs(currentPoint.Y - PreviousPoint.Y) >= 4)
{
var newPoint = new PointF((currentPoint.X + PreviousPoint.X) / 2,
(currentPoint.Y + PreviousPoint.Y) / 2);
CurrentPath.AddQuadCurveToPoint(newPoint, PreviousPoint);
PreviousPoint = currentPoint;
InvokeOnMainThread(SetNeedsDisplay);
PointerEvent?.Invoke(this, new PointerEventArgs(PointerEventArgs.
PointerEventType.Move, PreviousPoint.ToPoint(), newPoint.ToPoint(), PointerDown));
}
else
{
CurrentPath.AddLineTo(currentPoint);
InvokeOnMainThread(SetNeedsDisplay);
}
}
public override void TouchesBegan(NSSet touches, UIEvent evt)
{
IndexCount++;
var path = new UIBezierPath
{
LineWidth = PenWidth
};
var touch = (UITouch)touches.AnyObject;
PreviousPoint = touch.PreviousLocationInView(this);
var newPoint = touch.LocationInView(this);
path.MoveTo(newPoint);
InvokeOnMainThread(SetNeedsDisplay);
CurrentPath = path;
var line = new VESLine
{
Path = CurrentPath,
Color = CurrentLineColor,
Index = IndexCount
};
Lines.Add(line);
PointerDown = true;
PointerEvent?.Invoke(this, new PointerEventArgs(PointerEventArgs.
PointerEventType.Down, PreviousPoint.ToPoint(), newPoint.ToPoint(), PointerDown));
}