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Functions | |
| BOOL | GWinding (PPOINT pPoints, PBYTE Types, INT32 Length, UINT32 pFlatness, UINT32 &BottomLeftOffset, POINT &BottomLeft) |
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BOOL GWinding( PPOINT pPoints, Path PBYTE Types, UINT32 Length, UINT32 pFlatness, Flatness UINT32 &BottomLeftOffset, Offset to bottom left point. POINT &BottomLeft Bottom left most point. ) ; This call returns information about the winding of a path. The boolean result indicates a clockwise or anticlockwise winding at the bottom left most point. This point is returned and also the offset to either this point or the offset to the curve that contains this point. No errors should occur as the path is expected to be in a legal state. Definition at line 237 of file gwinding.cpp. 00245 { 00246 Flatness = pFlatness*27/2 ; 00247 StartPoint = Points = pPoints ; 00248 BottomLeft = PrevPoint = LastPoint = *Points++ ; Types++ ; --Length ; 00249 BottomLeftOffset = 0 ; 00250 Flags = 03 ; 00251 while ( Length>0 ) 00252 { 00253 if ( (*Types & PT_MOVETO)==PT_LINETO ) 00254 { 00255 DoLine( Points[0] ) ; 00256 Points++ ; Types++ ; --Length ; 00257 } 00258 else /* Curve */ 00259 { 00260 FlattenCurve( Points[-1],Points[0],Points[1],Points[2] ) ; 00261 Points+=3 ; Types+=3 ; Length-=3 ; 00262 } 00263 } 00264 if ( BottomLeft.x!=LastPoint.x || BottomLeft.y!=LastPoint.y ) 00265 PrevPoint = LastPoint ; 00266 if ( Flags & 01 ) 00267 Prev_Point = PrevPoint ; 00268 else if ( Flags & 02 ) 00269 Next_Point = *StartPoint ; 00270 pBottomLeftOffset = BottomLeftOffset ; 00271 pBottomLeft = BottomLeft ; 00272 INT32 Sgn = GWSgnMulSubMul( Next_Point.x-BottomLeft.x, Prev_Point.y-BottomLeft.y, 00273 Prev_Point.x-BottomLeft.x, Next_Point.y-BottomLeft.y ) ; 00274 if ( Sgn ) 00275 return Sgn<0 ; 00276 Sgn = Next_Point.x-Prev_Point.x ; 00277 if ( Sgn ) 00278 return Sgn<0 ; 00279 Sgn = Prev_Point.y-Next_Point.y ; 00280 return Sgn<0 ; 00281 }
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1.4.4