SAP Graphic Canvas Class for Dynpro Files

Contents of file NUGG_CANVAS.nugg:

CLAS ZCX_GUI_CANVAS --> Exception class that deals with all Canvas-related error messages;

INTF ZIF_GUI_CANVAS --> This interface should be implemented by every class that wants to be able to
                        offer a graphic canvas functionality;

INTF ZIF_GUI_CANVAS_DRAWABLE --> Every class that implements this interface will be able to offer an
                                 object drawable by class ZCL_GUI_CANVAS_OBJECT;

CLAS ZCL_GUI_CANVAS --> This is the main class that should be used to have the graphic canvas functionality on
                        your program.
                        This is an implementation example of interface ZIF_GUI_CANVAS;

CLAS ZCL_GUI_CANVAS_OBJECT --> This class takes the canvas functionality to the next level and implements a
                               canvas that is able to deal with objects such as points, lines, circles, ie,
                               instances of classes that implement the interface ZIF_GUI_CANVAS_DRAWABLE;

CLAS ZCL_GUI_CANVAS_DRAWABLE_POINT --> This allows the implementation of an object that can be drawn by class
                                       ZCL_GUI_CANVAS_OBJECT;
                                       This is an implementation example of interface ZIF_GUI_CANVAS_DRAWABLE.
                                                                              
PROG ZCANVAS --> Demonstration program that uses class ZCL_GUI_CANVAS to offer a graphic canvas to the user.
                 It sets and resets pixels based on double clicks inside the canvas area;

PROG ZCAMVAS_OBJECTS --> Demonstration program that uses class ZCL_GUI_CANVAS_OBJECT To offer drawings of instances of
                         class ZCL_GUI_CANVAS_DRAWABLE_POINT on canvas. It also works with clicks and double clicks.