Hit Testing Regions
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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