The Model-View-Controller Architecture - Essentials of Interactive Computer Graphics - page 127

Source File. Model.h file

class CModel {

in the Model folder of the

D3D _ SimulateGravity
project.

A: Similar to CModel from Tutorial 5.2
void CreateHeroBall(x, y);
// Create the Ball/Circle at (x,y)
void ResizeHeroBall(x, y);
// Resize the Ball such that (x,y) passes through circumference
void MoveHeroBallTo(x, y);
// Move the center of the Ball to (x,y)
void DrawModel();
// Draw the Ball (circle)

B: Methods to support behaviors of the free-falling ball.
void SetWorldSize( float width, float height);
void SetHeroBallAnimation( bool on);

C: Simulate the free falling ball.
void UpdateSimulation();

D: Internal representations.
CBall m _ Ball;
// the ball
bool m _ bAnimatingBall;
// should the ball free fall?
float m _ WorldWidth, m _ WorldHeight;
// bounds of the window
clock _ tm _ previous _ update _ time;
// how much time has passed between UpdateSimulation calls

};

Listing 5.17. The CModel class (Tutorial 5.3).

In this case, the CModel has the following.

• (A) Familiar functionality to support the creation and editing of the circle
(or HeroBall ).

• (B) Proper support for simulation: the model must know when to begin sim-
ulation (after the mouse button releases) and the bounds for the simulation
(size of the application window).