Chapter 5

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5

• Collision Theory and Logic

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• Use game design software to create a playable
  video game.
• Integrate animated objects into a video game.
• Create sound and music effects in a video game.
• Debug a video game.
• Describe basic computer logic.
• Build applied mathematics logic statements.
• List features of object oriented programming.

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Basic Logic

• Action-reaction relationship
• Condition and event or cause and effect
• IFTHEN is the most basic logic statement
• IF I drop a book, THEN it will make a noise

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Game Logic Example

• IF the go-cart collides with the banana peel,
• THEN the go-cart spins out

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User Interface Example
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Advanced Logic Statements

• AND, OR, ELSE operators allow multiple actions or
  reactions
• Multiple IF conditions
• Multiple THEN operations

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Advanced Logic Statements

• IF the dart collides with the balloon,
• THEN destroy the balloon
• AND create an explosion animation
• AND add 100 points to the players score

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Advanced Logic Statements

• IF the dart collides with a yellow balloon
• AND
• IF the yellow balloon overlaps any other balloon
• THEN

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Advanced Logic Statements

• IF the number of darts is greater than 0
• THEN load one dart in the hand
• ELSE display the message Game Over

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Logic Statements Feature

• A grasshopper jumps on a piece of food and the
  player earns 100 points

grasshopper
food

• IF __________ collides with _____,

100 points

• THEN add _________ to score

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Logic Statements Feature

• A grasshopper jumps on a lily pad and does not
  fall into the water

grasshopper
lily pad

• IF __________ collides with ________,

movement

• THEN _________ stops.

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Logic Statements Feature

• A grasshopper runs into a mushroom and falls into
  the water

grasshopper
mushroom

• IF __________ collides with __________,

grasshopper

• THEN ___________ movement falls

player

• AND ______ loses one life.

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Logic Statements Feature

• A grasshopper runs into a four-leaf clover and
  earns 50 points and an extra life

grasshopper collides with four-leaf clover

• IF __________________________________,

add 50 points to score

• THEN ___________________,

add one life to player

• AND __________________

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Logic Statements Feature

• The player achieves 10,000 points and earns an
  extra life

player score
10,000

• IF ___________ equals ________,

one
lives

• THEN add _____ to the number of remaining _____

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Collision Theory

• Collision is the most useful condition
• Interactivity between game objects
• IF the coyote collides with the black spot, THEN
  the coyote falls
• The black spot acts like a hole

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Collision Theory

• Collision statement glitch
• Spiko should sink in water
• Blue water image should act like water

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Collision Theory Feature

• Think about the collisions in bowling
• List all of the actions and reactions you can
  think of in the game
• Write each collision as a logic statement with
  IF, THEN, AND, OR, or ELSE operators

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Relative Location

• Based on position of another game object
• Example an explosion placed relative to a popped
  balloon
• Relative coordinate is (0,0)

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The Games Factory 2

• Game engine developed by Clickteam
• Object-oriented programming
• Very easy to use
• Drag-and-drop user interface
• Consists of several views or modules
• Frame editor
• Event editor
• Storyboard editor

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The Games Factory 2 Frame Editor

• Used for scene design and layout

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The Games Factory 2 Frame Editor

• Library window
• Standard tree-type organization
• Drag-and-drop objects onto the game frame

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The Games Factory 2 Frame Editor

• Properties window
• Contains various properties of selected object
• Changing properties alters the object function

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The Games Factory 2 Event Editor View

• Events are programmed interactions
• Conditions are the IF side of a logic statement
• Reactions are THEN side of logic statement
• Check marks (ticks) store reactions

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• What relationship is used by game programmers to
  create a game environment that the player can
  control?

Action-reaction relationship
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• What is a condition in game programming?

An action that causes something to happen.
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• What is an event in game programming?

The change that occurs when a condition is met.
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• What is the most basic logic statement?

An IFTHEN statement
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• Write a logic statement for this situation when
  the dog eats the cookie, the player receives 100
  points and earns an extra life

IF the dog eats a cookie, THEN add 100 to the
player score AND add one to the number of player
lives.
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• Modify the previous logic statement to include
  sound in the game for the event

IF the dog eats a cookie, THEN add 100 to the
player score AND add one to the number of player
lives AND play a sound.
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• The Games Factory 2 is an object-oriented
  programming engine. How are the properties of an
  object changed?

The Properties window in The Games Factory 2
contains the properties for a selected object and
is where those properties are changed.
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• Action-reaction relationship
• How an action causes something to change or
  react.
• Cause and effect
• Relationship between what has happened making
  something change or react.
• Collision
• Condition that occurs when an object touches
  another object.
• Collision statement
• Logic statement with a condition of two or more
  objects colliding.

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• Condition
• Term for the IF side of a programming line for a
  video game.
• Event
• Term for the THEN side of a programming line for
  a video game.
• Interactivity
• How one object behaves in relation to the objects
  around it.
• Logic statement
• IF and THEN programming to determine an
  action/reaction relationship in a game.