Canvas graphics

• MGraphic An attribute bundle that defines fill, frame, and line styles; a Draw function; a transformation function for translating, rotating, and scaling operations; and a Find function for hit detection.
• GrafEdit: Functions to create a selection feedback graphic and an interactor; the ability to maintain the transformation matrix separate from the geometry; and the provision of access to this matrix so that selection and interaction behavior can be oriented relative to canvas graphics. The mechanics of selection and interaction are described in later sections.