Coding

What is a canvas

A part of a display on which a gam runs

What is a screen

A large grid of pixels. Each pixel has a unique x and y coordinate

How do we give an illusion that an actor is moving fast

By increasing the canvas frequency and changing the x and y coordinates rapidly we can give the illusion of moving actors

getWidth() and getHeight()

To give us the full width and height of the canvas

getX()

To give the exact position of an actor

What does method do

A set of instructions an object has to follow

Constructor

Gives initial values for new object created

Getter

Is a method that allows you to access information on a field in a class

Setter

Changes a fields value

Helper

Supports all the other methods by breaking them into smaller parts

What is a class

A blueprint for creating an object, defining the field and method of each object

Field

A variable found in a class that contains values. Such as as: colour, number, size etc.

Object

A thing in code that contains a method and field

Comment (types)

Used to explain code, but is ignored by the computer.
// single line comment
/*
disfjosdif
*/

Vairable

A component that stores information that can change throughout the duration of the component

Data types

int, boolean, float, and doable

addObjects()

Adds objects to the world

getRandomNumber(x)

A method used to get a random number

What is a loop

To repeat code several times. Although undesirable in code it is essential when gaming

IDE

Intergrated Development Environment

API

Application Programme Interface

What is greenfoot

A gaming engine that allows you to create 2D animation through Java code

Import

Used to import additional code from libraries

Semicolons

Used to end code, to show the computer the instruction is complete

Curly brackets

To group code

If statement

Allows the program to make decisions