# ct.camera new in v1.3

Hey,

This page describes the methods and parameters of ct.camera object in a form of a reference. You can learn about techniques and usage in a more free form at the "Working with Viewport" page.

# Camera's Geometry

# ct.camera.x, ct.camera.y

The real x and y coordinates of the camera. It does not have a screen shake effect applied, as well as may differ from targetX and targetY if the camera is in transition.

# ct.camera.targetX and ct.camera.targetY

The x and y coordinates of the target location. Moving it instead of just using the x/y parameter will trigger the drift effect.

# ct.camera.computedX, ct.camera.computedY

The resulting position of the camera in game coordinates. These have screen shake and ct.camera.shiftX, ct.camera.shiftY applied.

# ct.camera.width, ct.camera.height

The width and height of the camera of the unscaled shown region. Use ct.camera.scale to get a scaled version. To change these value, see ct.width and ct.height properties.

# ct.camera.rotation

A value in degrees that rotate the camera.

# ct.camera.scale.x, ct.camera.scale.y

A scalar value that scales the capturing rectangle. If compared to image viewing tools, 1 and 1 means no scaling, 0.5 will zoom in to a 200% view, 3 will zoom out and produce 33% scaling.

# ct.camera.left, ct.camera.top, ct.camera.right and ct.camera.bottom

These represent the resulting location of a particular side of the camera in game units. Those cannot be changed manually.

# ct.camera.uiToGameCoord(x, y) and ct.camera.gameToUiCoord(x, y)

Convert a point from one coordinate space to another. These return an array with two elements: x and y coordinates.

There are also ct.u.uiToGameCoord and ct.u.gameToUiCoord, that call these methods of the current ct.camera object.

# ct.camera.getTopLeftCorner(), ct.camera.getTopRightCorner(), ct.camera.getBottomLeftCorner(), ct.camera.getBottomRightCorner()

Return an array with two elements, x and y coordinates. These are in game coordinates, and take rotation and scaling into account.

# ct.camera.getBoundingBox()

Returns a bounding box of the camera, in game coordinates. See PIXI.Rectangle for its properties.

# Following a Copy

# ct.camera.follow

If set, the camera will follow the given copy.

# ct.camera.followX, ct.camera.followY

Works if follow is set to a copy. Setting one of these to false will disable automatic camera in a given direction.

# ct.camera.borderX, ct.camera.borderY

Works if follow is set to a copy. Sets the frame inside which the copy will be kept, in game pixels. Can be set to null so the copy is set to the center of the screen.

# Screen Shake and Wobble

# ct.camera.shake

The current power of a screen shake effect, relative to the screen's max side (100 is 100% of screen shake). If set to 0 or less, it, disables the effect.

# ct.camera.shakePhase

The current phase of screen shake oscillation.

# ct.camera.shakeDecay

The amount of shake units substracted in a second. Default is 5.

# ct.camera.shakeFrequency

The base frequency of the screen shake effect. Default is 50.

# ct.camera.shakeX, ct.camera.shakeY

A multiplier applied to the screen shake effect. Default is 1.

# ct.camera.shakeMax

The maximum possible value for the shake property to protect players from losing their monitor, in shake units. Default is 10.

# Other

# ct.camera.drift

If set to a value between 0 and 1, it will make camera movement smoother

# ct.camera.shiftX, ct.camera.shiftY

These displace the camera in UI units, but do not change ct.camera.x or ct.camera.y.

# ct.camera.realign(room)

Realigns all the copies in a room based on new dimensions of a camera. This is useful for quick positioning of UI elements on different screens. New position is the result of interpolation based on copies' xstart and ystart parameters, so it won't work with moving elements. You can skip the realignment for some copies if you set their skipRealign parameter to true.

The method is usually applicable to fittoscreen's "Expand" and "Scaling without letterboxing" modes only.

No ct.camera.realign With ct.camera.realign
UI elements are scaled, but appear displaced if screen proportions change UI elements are both scaled and evenly distributed accross the screen

# Example: Realing UI elements in a room

On Draw code of your UI room:

ct.camera.realign(this);

Yup, that's it!

# ct.camera.manageStage()

This will align all non-UI layers in the game according to the camera's transforms. This is automatically called internally, and you will hardly ever use it.

# Spawning a new instance of a camera

You can create a new camera object for your needs by calling a Camera constructor:

const oldCamera = ct.camera;
ct.camera = new Camera(0, 0, 1024, 768);