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判断某一个点TPOINT是否在一个区域内TRECT用PtInRect函数，函数具体用法如下：
Indicates whether a specified point lies inside a specified rectangle.
Unit
Types
Category:
geometric routines
Delphi syntax:
function PtInRect(const Rect: TRect; const P: TPoint): Boolean;
C++ syntax:
extern PACKAGE bool __fastcall PtInRect(const TRect Rect, const TPoint P);
Description
PtInRect returns true if the point, P, lies inside the rectangle, Rect, and false if P is not in Rect.
PtInRect does not consider a point inside a rectangle if the rectangle has a negative width or height. A point is considered inside a rectangle if it lies on the left or top edge, but not if it lies on the right or bottom edge.
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