Issue about Canvas Boundries

var newX = (startPoint.X + (e.GetPosition(CanvasForPoint).X - startPoint.X));

var newY = (startPoint.Y + (e.GetPosition(CanvasForPoint).Y - startPoint.Y));

Point offset = new Point((startPoint.X - lastLoc.X), (startPoint.Y - lastLoc.Y));

CanvasTop = newY - offset.Y;

CanvasLeft = newX - offset.X;

mousePositionOfX = newX;

mousePositionOfY = newY;

if (mousePositionOfX > 0 && mousePositionOfY > 0 && CanvasTop<(CanvasForPoint.ActualHeight-StartPoint.ActualHeight) && CanvasLeft<(CanvasForPoint.ActualWidth-StartPoint.ActualWidth))

{

StartPoint.SetValue(Canvas.TopProperty, CanvasTop);

StartPoint.SetValue(Canvas.LeftProperty, CanvasLeft);

}

Here CanvasForPoint is my actual canvas and Start Point is my ellipse on canvas. I put Its height and width properties For Setting boundries.

 

Thanks For Your Help