DELPHI AREA Forum • View topic - Math&graphic

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Math&graphic

Posted: April 30th, 2006, 6:41 am

by hani

Hi,
How i can know if point is inside polygon or not

Thanks

Posted: April 30th, 2006, 10:23 am

by Kambiz

Code: Select all: function PtInPolygon(const Polygon: array of TPoint; const Pt: TPoint): Boolean; var Rgn: HRGN; begin Rgn := CreatePolygonRgn(Polygon, Length(Polygon), WINDING); try Result := PtInRegion(Rgn, Pt.X, Pt.Y); finally DeleteObject(Rgn); end; end;

Posted: April 30th, 2006, 11:22 pm

by kokkoras

Is PtInRegion a win API call?

Posted: May 1st, 2006, 7:30 am

by HPW

Yes, from the delphi windows SDK help:

Code: Select all: BOOL PtInRegion( HRGN hrgn, // handle of region int X, // x-coordinate of point int Y // y-coordinate of point );