Class TGopFilledPolygon

class TGopFilledPolygon : public TGraphicsOperation;

Description

An accelerated graphics operation that fills a polygon with a colour.

TGopFilledPolygon::AddPoints(TInt,TPoint *) must be called to specify the polygon to be filled. Objects of this class can be passed to a graphics accelerator's Operation() function either individually, or in a buffer.

How a graphics accelerator can fill polygons is given by TGraphicsAcceleratorCaps::iPolygon.

Derivation

• TGraphicsOperation - Abstract base class for all graphics operations.

• TGopFilledPolygon - An accelerated graphics operation that fills a polygon with a colour.

Members

Defined in TGopFilledPolygon:

• AddPoints(TInt,TPoint *)Specifies the polygon to be filled as a number of 2D point coordinates.
• iColorThe fill colour.
• iFillRuleBit flags for how self-crossing polygons are filled.
• iNumPointsThe number of points in the polygon.

Inherited from TGraphicsOperation:

• Append(TInt,TAny *)
• EAlphaBlendOneBitmap
• EAlphaBlendTwoBitmaps
• EBitBlt
• EBitBltAlphaBitmap
• EBitBltAlphaChannel
• EBitBltMasked
• EBitBltTransparent
• EChunkTest
• EFadeRect
• EFilledPolygon
• EFilledPolygonWithPattern
• EFilledRect
• EFilledRectUsingDrawMode
• EFilledRectWithPattern
• EInvertRect
• EScaledBitBlt
• EScaledBitBltAlphaBitmap
• EScaledBitBltAlphaChannel
• EScaledBitBltMasked
• EScaledBitBltTransparent
• EVirtualAddressTest
• Function()const
• Next()const
• Size()const
• TGopFunction
• TGraphicsOperation(TGopFunction,TInt)
• iFunction
• iSize

See also:

• TGraphicsAcceleratorCaps::iPolygonSpecifies the supported fill rules for self crossing polygons. Uses a bit flag f...

inline TGopFilledPolygon(TRgb aColor, CGraphicsContext::TFillRule aFillRule);

Description

Constructor with a fill rule and a fill colour. The number of points is initialised to zero.

Parameters

TRgb aColor The fill colour. CGraphicsContext::TFillRule aFillRule Bit flags for how self-crossing polygons are filled.

inline void AddPoints(TInt aNumPoints, TPoint *aPoints);

Description

Specifies the polygon to be filled as a number of 2D point coordinates.

TGopFilledPolygon::AddPoints(TInt,TPoint *) should only be called once the TGopFilledPolygon object has been stored into a buffer. There must be enough room in the buffer after the TGopFilledPolygon object to hold aNumPoints TPoint sized structures. This is because the points are copied into the memory space directly following the TGopFilledPolygon object.

Parameters

TInt aNumPoints The number of points in the polygon. TPoint *aPoints Pointer to the first point in the polygon.

TRgb iColor;

Description

The fill colour.

CGraphicsContext::TFillRule iFillRule;

Description

Bit flags for how self-crossing polygons are filled.

See also:

• CGraphicsContext::TFillRuleRules used to fill self crossing polygons.

TInt iNumPoints;

Description

The number of points in the polygon.