Chapter 1: Introduction - hpi-swa-teaching/InteractivePongTutorial GitHub Wiki

• Newly visible classes and methods:
• Initial state:
• Explain/Task:

Level 01: Intro

• Newly visible Classes and Methods:

  • Game: initialize

• Initial state:

  • Game with constructor, grey Background in initialize

• Explain:

  • UI Elements: Squeaky has hints, reset and solution buttons, home to chapter view, play starts game (again)
  • Navigation through classes
  • what Game initialize does and besticky, Game is a Morph, has basic Morph methods

• Task:

  • Change color of Game to Black

Level 02: Create Ball

• Visible Classes and Methods:
  • Game: initialize, initializeBall, ball, ball:
  • Ball: initialize, game, game:
• Initial state:
  • Game: accessors, initializeBall empty, initBall in init
  • Ball>>game has setter, Ball>>initialize has just extent
• Explain/Task:
  • Write Ball>>initialize: set color and extent to self defaultExtent
  • Complete Game:ball getter and setter
  • create Ball in initalizeBall in Game via Ball new and set to variable, , self addMorph, explain subMorph behavior

Level 03: Ball movement

• Newly Visible Classes and Methods:
  • Ball>>step, stepTime, speed, turnHorizontal, turnVertical
• Initial state:
  • step empty, stepTime is set
• Explain/Task:
  • set speed in initialize to default speed in x and y direction (hint: point with x @ y)
  • update position in step by adding speed
  • negate x/y respectively in turnHor/turnVert
• Tips:
  • Point with x @ y
• negate with aNumber negated

Level 04: Wall collision

• Newly visible classes and methods:
  • Ball>>checkCollisionWithWalls, startover
• Initial state:
  • new methods empty
• Explain/Task:
  • Game has methods top,bottom,left,right for coordinates of walls and center for center
  • Speed has been removed from initialize, we need startOver: set Ball position to center and it speed to random defaultSpeed in all directions
  • Hint: you can use *{1 . -1} atRandom for a random positive or negative Value
  • between: aNumber and: aNumber checks if something is inbetween
  • (condition) ifFalse: [then] is if
  • Write Collide withWalls, should turnHorizontal on left/right and vertical on top/bottom

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