Hit Testing
An application performs hit testing on regions to determine the coordinates of
the current cursor position. Then it passes these coordinates
as well as a handle identifying the region
to the
PtInRegion function. The cursor coordinates can be retrieved by processing the various
mouse messages, such as
WM_LBUTTONDOWN,
WM_LBUTTONUP,
WM_RBUTTONDOWN, and
WM_RBUTTONUP. The return value for
PtInRegion indicates whether the cursor position is within the given region.
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