Rectangle Coordinates
An application must use a
RECT structure to define a rectangle. The structure specifies the coordinates of
two points: the upper left and lower right corners of the rectangle. The sides
of the rectangle extend from these two points and are parallel to the x- and
y-axes.
The coordinate values for a rectangle are expressed as signed integers. The
coordinate value of a rectangle's right side must be greater than that of its
left side. Likewise, the coordinate value of the bottom must be greater than that
of the top.
Because applications can use rectangles for many different purposes, the
Windows rectangle functions do not use an explicit unit of measure. Instead, all
rectangle coordinates and dimensions are given in signed, logical values. The
mapping mode and the function in which the rectangle is used determine the units of
measure. For more information about coordinates and mapping modes, see
Coordinate Spaces and Transformations.
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