Basic GrafEdit

You can write a Basic Compound Document framework program when your program uses graphics, but does not need to be part of a compound document or when you want to implement a different storage mechanism. For example, you might write a small program for configuring video devices by implementing your own MCanvasRepresentation, TCanvasView, and MCanvasSelection derived classes to use rectangles to represent each monitor. The rectangles might be moved and sized according to their relative layout and aspect ratios in global coordinates.

The Basic GrafEdit classes are:

• MCanvasRepresentation
• MCanvasSelection
• TCanvasView
• TCanvasGraphic
• TCanvasGraphicFilter
• TCanvasGraphicFunnel
• TCommandOn< MCanvasSelection >
• TCanvasInteractor
• The following canvas tool convenience classes:
  • TCanvasLineCreationTool
  • TCanvasCurveCreationTool
  • TCanvasPolylineCreationTool
  • TCanvasPolygonCreationTool
  • TCanvasTextCreationTool

MCanvasRepresentation, MCanvasSelection, TCanvasGraphicFilter, and TCanvasGraphicFunnel are purely Basic GrafEdit classes. The other basic classes have derivations as follows:

• TCanvasView derives from TContentView.
• MCanvasGraphic derives from MGraphic.
• The canvas commands derive from the TCommandOn template. TCommandOn takes an MCanvasSelection parameter to tell the template that the commands derived from it are part of Basic GrafEdit. A command is bound to a target (an MCanvasSelection), which is the data upon which the command works.
• TCanvasInteractor derives from TToolInteractor and mixes in MMouseEventHandler. TToolInteractor derives from TInteractor.
• The Canvas tool classes descend from TSimpleMouseTool and TDelegatingMouseTool, which in turn derive from TTool.
• TToolCommandBinding and TToolCommandBindingCmd derive from command binding classes in the Basic Document framework.