Videogame Design

Washington Irving Middle School

Citizen Schools Fall ‘06

Circle of Evaluation Cedrick and Yar

Values and TypesYar and Evan

• Numbers

• Strings

• Booleans

• Images

The Design Recipe Kassandra and Artehanna

1. State the Problem

2. Define the Data

3. Make the Contract

4. Give Examples

5. Take Inventory

6. Code

7. Test

State the Problem

A rocket takes off at a speed of 7 meters per second. Write a function rocket-height that takes the time as input and calculates the height.

Data Definition

Time is a Number

Contract

; rocket-height : Number -> Number

Examples

(rocket-height 13) should be 91

Take Inventory

; rocket-height : Number -> Number

(define (rocket-height time)

…)

Code

; rocket-height : Number -> Number

(define (rocket-height time)

(* 7 time)

Test the Examples

If it worked you did it right!

If not….salted!

ConditionalsCelin

(define (move x)

(cond

[(= x 1) “scissors”]

[(= x 2) “rock”]

[(= x 3) “paper”]))

The GameMarduche

• Three “characters” in the game– The Target (flies around)– The Missile (hits the target)– The Gun (moves and fires the missile)

• Each character has a function that draws it, and one that updates it

• The distance formula tells if the missile has hit the target

The Game

target

Gun

Missile