Game Lab Documentation

Drawing

Control

For loop

If statement

If/else statement

While loop

clearInterval(interval)

clearTimeout(timeout)

Variables

Declare and assign a string to a variable

Declare and assign a value to a variable

Declare and assign an array ["a", "b", "d"] to a variable

Declare and assign an array [1,2,3] to a variable

[list].length

[string].includes(searchValue)

[string].indexOf(searchValue)

[string].length

[string].substring(start, end)

[string].toLowerCase()

[string].toUpperCase()

comment

console.log(message)

Functions

Call a function

Call a function with parameters

Comment

Define a function

Define a function with parameters

return

mouseDown()

Category:Game Lab

Checks if the mouse button specified is pressed.

Some interactive games use the mouse for the user to control the game.

Examples

function draw() {
  console.log(mouseDown("leftButton"));
}

Pencil Drawing

Simple pencil drawing with mouseDown().

// Simple pencil drawing with mouseDown().
var sprite = createSprite(200, 200, 5, 5);
World.frameRate=60;
function draw() {
  sprite.x=World.mouseX;
  sprite.y=World.mouseY;
  if (mouseDown("leftButton")) drawSprites();
}

Syntax

mouseDown(button)

Parameters

Name	Type	Required?	Description
button	String		The mouse button you want to check, either "leftButton" or "rightButton".

Returns

Boolean true or false.

Tips

When testing your games that use keyboard or mouse input make sure you click in the display area before you run, otherwise the Workspace will record your keyboard and mouse actions.

Found a bug in the documentation? Let us know at support@code.org.