pen
A D2DPen that determines the Pen's color, thickness, and style.
startPoint
The starting point where the arc begins.
endPoint
The ending point of the arc.
size
A Size structure that specifies the x- and y-radius of the arc.
sweepDirection
A System.Windows.Media.SweepDirection value that specifies whether to draw the arc in the Clockwise or Counterclockwise direction.
isLargeArc
The value that indicates whether the arc should be greater than 180 degrees. Set it to "true" if the arc should be greater than 180 degrees, and "false" if it should be less than 180 degrees.
An elliptical arc is defined by its starting and ending points, x- and y-radius, a value indicating whether the arc should be greater than 180 degrees, and a value describing the direction in which the arc is drawn.