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VG101 RECITATION 8

VG101 RECITATION 8. By TAs. CONTENTS. Brief review of class Strategy for assignment 9 Questions about assignment 7, 8. BRIEF REVIEW OF CLASS. In header file: Base class Constructors Private/protected/public member Data/ function member Accessors/ Mutators In cpp file:

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VG101 RECITATION 8

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  1. VG101RECITATION 8 By TAs

  2. CONTENTS • Brief review of class • Strategy for assignment 9 • Questions about assignment 7, 8

  3. BRIEF REVIEW OF CLASS • In header file: • Base class • Constructors • Private/protected/public member • Data/ function member • Accessors/ Mutators • In cpp file: • Implementation of class functions

  4. Base class Data members Private member constructor class RectangleT : public GObjectT { PointT llp, urp; void drawRect (); public: RectangleT (const double x0 = 0, const double y0 = 0, const double x1 = 0, const double y1 = 0, const string clr = "Blue", const double fill = 0); RectangleT (const PointT &p0, const PointT &p1, const string clr = "Blue", const double fill = 0); const PointT &getLocation () {return llp;} double getWidth () const; double getHeight () const; double getArea () const; void setLocation (const double x, const double y); void setLocation (const PointT p); void setWidth (const double w); void setHeight (const double h); void draw (); void draw (const string clr, const double density = 0); }; Public member Get & Set Function members

  5. BRIEF REVIEW OF CLASS • Base class • Base class will be constructed first • // BallT is a derived class from ArcT • // A ball is an arc of 360 degree • BallT (double r = 0) : ArcT (r, 0, 360, "Blue", 1) {}; • Constructors • Always define a default constructor (suggested) • One and only one of the constructors must be called

  6. Strategy for assignment 9 • Divide the project into several stages: • 1. class design • 2. initialization • 3. get ball/paddle moving • 4. handle collisions • 5. end of game • One function for one simple purpose only • Test your functions one by one • Test your program after finishing each stage • Have fun after finishing the whole project

  7. STAGE ONE: CLASS DESIGN • Game window: GwindowT • Represent the application window • Brick wall • Represent all the bricks • Row, column, vector of bricks… • Brick: RectangleT • Represent one brick • Color, position(row, column), location( x, y)… • Paddle: RectangleT • Location(x, y) …

  8. STAGE ONE: CLASS DESIGN • What need you to design: • 1. constructors • 2. data members and their accessors and mutators • 3. special functions: • Samples: • // let the paddle move when being selected bool paddle::selected(…) void paddle::move(…) • // draw the brick wall, the main function in initialization void brickWall::draw(…)

  9. STAGE TWO: INITIALIZATION • Initialize the game: • 1. init brick wall, give color, location to each brick • 2. init paddle, give color, location to it • 3. draw the window ,the wall and paddle • No movement in this stage • Refer to the lecture note on drawing the brick wall

  10. STAGE THREE: GET BALL/PADDLE MOVING • To move the ball • Just as what you do in assignment 5-2 • Consider the brick wall as a static border of the window, don’t drop out the brick been clicked • To move the paddle • Just as the movingBall program discussed in lecture (page 46) • Don’t let the paddle move out of the window • These are not difficult, but they are basis for the following stage

  11. STAGE FOUR: HANDLE COLLISIONS • Three kinds of collision • 1. ball and brick • 2. ball and paddle • 3. ball and window • For kind 2 and 3, it’s similar to assignment5-2 • Refer to the boundary check discussed in lecture (page 27) • Remember to check the position of the paddle to see whether the ball falls onto the paddle or falls out.

  12. STAGE FOUR: HANDLE COLLISIONS • For kind 1, divide it into two steps • 1. how to determine whether a known brick collides with the ball? • 2. search among all the existing brick in the wall to find the brick to be clicked • Maybe you need a function bool BrickT::isClicked(…) • 3. do changes to the ball (direction), and do changes to the brick (disappear) • You just need a for/while loop to do the searching and a if statement to handle the collision

  13. STAGE FIVE: END OF GAME • Taking care of some small details in the game: • You’ve got to take care of the case when the ball hits the bottom wall • You need to check for the other terminating condition, which is hitting the last brick • You should experiment with the settings that control the speed of your program • Most importantly, you’ve got to test your program to see that it works

  14. QUESTIONS ABOUT ASSIGNMENT 7, 8 • Send your code to TA’s email box if you didn’t submit your assignment before deadline • Any questions?

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