StreamGeometry is a light-weight alternative to the PathGeometry class for
creating complex geometric shapes. You can use StreamGeometry when you
need to describe a complex geometry but don’t want the overhead of supporting
data binding, animation, and modification.
There are two classes in WPF that provide the mini-language for describing
geometric paths: StreamGeometry, and PathFigureCollection. You need to use
the StreamGeometry mini-language when you set a property of the Geometry
type, such as the Data property of a Path element.
<path stroke="Blue" data="M 100 120 L 200 120 L 200 220 L 100 170">
</path>
This path uses a sequence of four commands. The first command, M, creates the
PathFigure and sets the starting point to (100, 120). The following three
commands (L) create line segments.
From the book of Practical WPF Graphics Programming
L endPoint : The end point of the line.
H x : The x-coordinate of the end point of the line.
V y : The y-coordinate of the end point of the line.
F0 specifies the EvenOdd fill rule.
F1 specifies the Nonzero fill rule.
An uppercase M indicates that startPoint is an absolute value; a lowercase m indicates that startPoint is an offset to the previous point
C controlPoint1 controlPoint2 endPoint : Cubic Bezier Curve Command
A size rotationAngle isLargeArcFlag sweepDirectionFlag endPoint : Creates an elliptical arc between the current point and the specified end point.
Z : Ends the current figure and creates a line that connects the current point to the starting point of the figure.
