Geometry classes

TPoint, TSize, TRect and TRegion are basic graphics classes.

A TPoint stores and provides the means for manipulating conceptual points and sizes. It consists of a pair of (x,y) co-ordinates, as illustrated in the diagram below.

A TSize is described in terms of a width and height.

A TRect represents a rectangle whose sides are parallel with the axes of the co-ordinate system. It is described by the co-ordinates of its top left and bottom right corners, or by its top left hand corner and its size.

A TRegion consists of one or more TRects. All Draw() functions in EPOC draw to a TRect rather than to a TRegion because calculating the dimensions of a TRegion is too complex for the requirements of most applications. TRegions are principally used when drawing sprites.

The classes: RRegion, RRegionBuf<class S> and TRegionFix<class S> all derive from TRegion.