The Model-View-Controller Architecture - Essentials of Interactive Computer Graphics - page 105

class CApplicationModel {
private : Application's private state.

Source file. Pseudocode; no
corresponding source file.

Array<CBall * > AllBalls
// World balls, initially empty
CBAll HeroBall
// The Hero Ball

bool DefiningNewHero

// If LMB drag is true

public : 1. Application state inquires.
bool IsDefinningHeroBall()
// If in the middle of defining a new hero ball
CBall * SelectedBall()
// Current hero ball is not null

int NumBallsOnScreen()

// Number of balls currently on screen

2. Application state change from user events.

void CreateHeroBall(mousePosition)

// center=mousePosition; radius=0; velocity=0

void ResizeHeroBall(mousePosition)

// compute new radius and velocity

void MoveSelectedBallTo(mousePosition)

// move hero to mousePosition, if no current hero NO-Op

void AddHeroBallToWorld()

// done with current hero, insert into world balls

void SelectBallAt(mousePosition)

// hero=ball at mousePosition, if none hero=NULL

3. Applicaiton state changes from application events.

void UpdateSimulation()

// Move balls by their velocities,
// update velocity by gravity and remove off-screen ones

4. Application state visualization.

void DrawModel( )

// Draw all the freefalling balls (including the HeroBall)

}

Listing 5.1. The model of the ball-shooting program.