Collision Theory and Logic

5

Collision Theory and

Logic

© Goodheart-Willcox Co., Inc. Permission granted to reproduce for educational use only.

• 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.


Basic Logic

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


Game Logic Example

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


User Interface Example


Advanced Logic Statements

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



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



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



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


Logic Statements Feature

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

grasshopper food

100 points

• IF __________ collides with _____,

• THEN add _________ to score



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

grasshopper lily pad

movement

• IF __________ collides with ________,

• THEN _________ stops.



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

grasshopper mushroom

grasshopper

player

• IF __________ collides with __________,

• THEN ___________ movement falls

• AND ______ loses one life.



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

grasshopper collides with four-leaf clover

add 50 points to score

add one life to player

• IF __________________________________,

• THEN ___________________,

• AND __________________



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

player score 10,000

one lives

• IF ___________ equals ________,

• THEN add _____ to the number of remaining _____


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


Collision Theory

• Collision statement glitch:• Spiko should sink in

water• Blue water image

should act like water


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


Relative Location

• Based on position of another game object• Example: an explosion placed relative to a popped

balloon• Relative coordinate is (0,0)


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


The Games Factory 2 Frame Editor

• Used for scene design and layout



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



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


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


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

Action-reaction relationship


What is a condition in game programming?

An action that causes something to happen.


What is an event in game programming?

The change that occurs when a condition is met.


What is the most basic logic statement?

An IF…THEN statement


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.


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.


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.

Collision Theory and Logic

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