The Model-View-Controller Architecture - Essentials of Interactive Computer Graphics - page 118

class CModel {
public :
// Draws the square and the circle
void Draw(); Source files. Model.h/.cpp

files in the Model folder of the
D3D _ ModelView project.

// For interaction with the radius control slider bar
float GetCircleRadius() const ;
void SetCircleRadius( float radius);
private :
// content of the world: a square and a circle
UWBD3D _ RectangleGeometry m _ LargeSquare;
UWBD3D _ CircleGeometry m _ SmallCircle;

};

Listing 5.6. The CModel class (Tutorial 5.1).

class CDrawOnlyHandler : public UWBD3D _ WindowHandler {
public :

Source file.
DrawOnlyHandler.h file in
the WindowHandler folder of
the D3D _ ModelView project.

.
bool Initialize(... control _ id ...);
// Place m _ window into the application main window
void DrawGraphics();
// Invoke CModel to redraw into the m _ window
private :
UWBMFC _ UIWindow m _ window;
// This is the GUI drawing area

};

Listing 5.7. CDrawOnlyHandler (Tutorial 5.1).

• CModel . In this case, the model is a very simple scene of a square and a
circle. From Listing 5.6, we notice that the public interface of the CModel
class is driven completely by the functionality of the application, where the
only requirements are the ability of getting and setting the radius of the
circle.
The CModel object is defined as an instance variable in the CTutorialApp
class. Because the CTutorialApp class represents the running process,
there can only be one instance, and thus there can only be a single instance
of the model.

• CDrawOnlyHandler . This a subclass of the UWBD3D _ WindowHandler .As
the name of the class suggests, this class can only support drawing (the