datas(3U) InterViews Reference Manual datas(3U)

ColorData, GSData, MobilityData, MoveData, VoidData - Data subclasses for storing common undo information

#include <Unidraw/Commands/datas.h>

The Unidraw library predefines several Data subclasses for storing common undo information: ColorData stores two PSColors (usually representing foreground and background colors), while GSData stores a complete set of graphics state in a FullGraphic object. MobilityData stores the mobility and graphics state information needed to undo a change in mobility. MoveData stores a horizontal and vertical distance. VoidData stores a void pointer as a useful alternative to deriving trivially from Data just to store one word of information.

Create a ColorData instance, supplying the PSColor objects it stores.

Create a GSData instance, supplying the Graphic object from which to copy a complete set of graphics state. The GSData constructor copies this information into its _gs member, from whence it can be retrieved later.

Create a MobilityData instance, supplying the mobility and a Graphic object from which to copy a complete set of graphics state. The MobilityData constructor copies the graphic into its _gs member, from whence it can be retrieved later.

Create a MoveData instance, supplying two floating point numbers that normally represent horizontal and vertical movement.

Create a VoidData instance, supplying a pointer to an object of unknown type.

Data(3U), Graphic(3U), globals(3U)

24 January 1991 Unidraw