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Room class

Room class

Rooms are the entities that contain all the copies, backgrounds, tile layers, and advanced entities, too. They are also referred to as maps and levels.

Rooms derive from PIXI.Containeropen in new window class, and inherit all its methods and properties.

The current room, rooms.current.

rooms.current always points to the current room. If you have multiple rooms layered on top of each other, rooms.current will point to the initial room that was created at the start of a game, or after calling rooms.switch.

To get layered rooms, you can use rooms.list, or this.getRoom inside copies' events.

UI and Gameplay rooms

Rooms can be put either into UI coordinate space or gameplay coordinate space. Gameplay rooms are managed by, and cannot be moved manually. But UI rooms can be: for example, to move smaller widgets around the viewport.


More about this concept at Game and UI Coordinates. For viewport management, see Working with Viewport.

Notable properties

alphanumberA value from 0 to 1 that sets the room's opacity. You can use it, for example, to gradually fade in/fade out UI layers. 0 means fully transparent, and 1 means fully opaque.
isUibooleanIf set to true, the room will be unaffected by camera scaling, movement, and rotation. See more at Game and UI Coordinates.
x, ynumberThe location of a room. Changing these has no effect if the room is in gameplay coordinates (if its isUi property is false)

Adding aligned copies during game's runtime

The makeCopyAligned and makeCopyAlignedRef methods of rooms align elements in a room based on the camera dimension changes. makeCopyAligned assumes you've already positioned your copy relative to the current camera dimensions, and makeCopyAlignedRef assumes you are placing a copy relative to room's dimensions as set in ct.IDE.

Example: Create a copy in a UI room and make it align to the top center point

// In room's Start event:
// Create a copy in the center of the room.
// Use camera.width and camera.height for this.makeCopyAligned.
var copy = templates.copy('BossHealthbar', this.template.width / 2, 0);
this.makeCopyAlignedRef(copy, {
    alignX: 'center',
    alignY: 'start'

The first argument is the copy you want to align, and the second argument contains an object with these properties:

  • alignX: how to align the copy horizontally;
  • alignY: how to align the copy vertically;
  • frame: the reference frame to position relative to (optional);
  • padding: borders to add to the reference frame (optional).

The alignX and alignY properties can have the following values:

  • 'start': The element is aligned relative to the top/left side of its alignment frame.
  • 'end': The element is aligned relative to the bottom/right side of its alignment frame.
  • 'center': The element is aligned relative to the center of its alignment frame.
  • 'both': The element is stretched to fill alignment frame. Any gaps are maintained to be of fixed size.
  • 'scale': The element is scaled proportionally to the alignment frame.

The frame property is an object that defines the reference frame. It has properties x1, y1 and x2, y2, and these define coordinates of two points that form the reference frame. Each coordinate is defined as a percentage of viewport's size.

this.makeCopyAlignedRef(copy, { // Make a copy aligned to the left third of the screen
    alignX: 'stretch',
    alignY: 'stretch',
    frame: {
        x1: 0,
        y1: 0,
        x2: 33.3, // Right side of the reference frame will be placed at 1/3 of the screen on the left
        y2: 100

If frame is not set, it defaults to (0;0) for the top-left corner and (100;100) for the bottom-right corner, meaning that the default reference frame matches camera dimensions.

padding is used to add additional fixed gaps inside the reference frame, which is useful when combining elements of fixed and scalable size on the screen. It is an object with left, right, top and bottom values:

// Make a copy aligned to the top of the screen, make it scale proportionately
// but leave additional gaps around it
this.makeCopyAlignedRef(copy, {
    alignX: 'stretch',
    alignY: 'start',
    padding: {
        left: 160,
        right: 160,
        top: 0,
        bottom: 0

If not set, padding defaults to 0 on each side.