ICiRect class corresponds to a COM API class.
Set rectangle coordinates to zero.
The y coordinate of the lower-right corner.
Is rectangle has no area.
The x coordinate of the upper-left corner.
The x coordinate of the lower-right corner.
The y coordinate of the upper-left corner.
The y coordinate of the lower-right corner.
The x coordinate of the upper-left corner.
The x coordinate of the lower-right corner.
The y coordinate of the upper-left corner.