The line drawing functions enable the user to draw the following graphics:
Rectangle
RoundRectangle
Circle
Lozenge
PosSLopeLine
NegSlopeLine
HorizontalLine
VerticalLine
The FillStyle property is used to define a FillStyle in graphics, e.g., Circle and Rectangle.
The LineStyle property is used to define a LineStyle, e.g., Dot and, PointChain.
If either of the following pairs of properties is changed, the other property is also changed to the same value as that of the changed property.
LineColor and foreground
FillColor and background
