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Camera

class Camera extends Node

A node representing an orthographic camera.

Press play to preview the animation
import ...

export default makeScene2D(function* (view) {
  const camera = createRef<Camera>();
  const rect = createRef<Rect>();
  const circle = createRef<Circle>();

  view.add(
    <>
      <Camera ref={camera}>
        <Rect
          ref={rect}
          fill={'lightseagreen'}
          size={100}
          position={[100, -50]}
        />
        <Circle
          ref={circle}
          fill={'hotpink'}
          size={120}
          position={[-100, 50]}
        />
      </Camera>
    </>,
  );

  yield* all(
    camera().centerOn(rect(), 3),
    camera().rotation(180, 3),
    camera().zoom(1.8, 3),
  );
  yield* camera().centerOn(circle(), 2);
  yield* camera().reset(1);
});

Constructors​

constructor​

public override new Camera{...}: CameraProps: Camera

Parameters

Overwrites Node.constructor

Properties​

absolutePosition​

readonly public absolutePosition: SimpleVector2SignalCamera

A helper signal for operating on the position in world space.

Retrieving the position using this signal returns the position in world space. Similarly, setting the position using this signal transforms the new value to local space.

If the new value is a function, the position of this node will be continuously updated to always match the position returned by the function. This can be useful to "pin" the node in a specific place or to make it follow another node's position.

Unlike position, this signal is not compound - it doesn't contain separate signals for the x and y components.

Inherited from Node.absolutePosition

absoluteRotation​

readonly public absoluteRotation: SimpleSignalnumberCamera

A helper signal for operating on the rotation in world space.

Retrieving the rotation using this signal returns the rotation in world space. Similarly, setting the rotation using this signal transforms the new value to local space.

If the new value is a function, the rotation of this node will be continuously updated to always match the rotation returned by the function.

Inherited from Node.absoluteRotation

absoluteScale​

readonly public absoluteScale: SimpleVector2SignalCamera

A helper signal for operating on the scale in world space.

Retrieving the scale using this signal returns the scale in world space. Similarly, setting the scale using this signal transforms the new value to local space.

If the new value is a function, the scale of this node will be continuously updated to always match the position returned by the function.

Unlike scale, this signal is not compound - it doesn't contain separate signals for the x and y components.

Inherited from Node.absoluteScale

cache​

readonly public cache: SimpleSignalbooleanCamera
Inherited from Node.cache

cachePadding​

readonly public cachePadding: SpacingSignalCamera

Controls the padding of the cached canvas used by this node.

By default, the size of the cache is determined based on the bounding box of the node and its children. That includes effects such as stroke or shadow. This property can be used to expand the cache area further. Usually used to account for custom effects created by shaders.

Inherited from Node.cachePadding

children​

readonly public children: SignalComponentChildrenNode[]CameraSignalContextComponentChildrenNode[]Camera
Inherited from Node.children

composite​

readonly public composite: SimpleSignalbooleanCamera
Inherited from Node.composite

compositeOperation​

readonly public compositeOperation: SimpleSignalGlobalCompositeOperationCamera
Inherited from Node.compositeOperation

creationStack​

readonly public creationStack?: string
Inherited from Node.creationStack

filters​

readonly public filters: FiltersSignalCamera
Inherited from Node.filters

isClass​

public isClass: boolean
Inherited from Node.isClass

key​

readonly public key: string
Inherited from Node.key

opacity​

readonly public opacity: SimpleSignalnumberCamera

Represents the opacity of this node in the range 0-1.

The value is clamped to the range 0-1.

Inherited from Node.opacity

parent​

readonly public parent: SimpleSignalnullNodevoid = ...
Inherited from Node.parent

position​

readonly public position: Vector2SignalCameraVector2SignalContextCamera

Represents the position of this node in local space of its parent.

Examples

Inherited from Node.position

properties​

readonly public properties: RecordstringPropertyMetadataany = ...
Inherited from Node.properties

rotation​

readonly public rotation: SimpleSignalnumberCamera

Represents the rotation (in degrees) of this node relative to its parent.

Inherited from Node.rotation

scale​

readonly public scale: Vector2SignalCameraVector2SignalContextCamera

Represents the scale of this node in local space of its parent.

Examples

Inherited from Node.scale

scene​

readonly public scene: SimpleSignalNodeCamera

The scene node that the camera is rendering.

shaders​

readonly public shaders: SignalPossibleShaderConfigShaderConfig[]CameraSignalContextPossibleShaderConfigShaderConfig[]Camera
Experimental
This is an experimental feature. The behavior and API may change drastically between minor releases.
Inherited from Node.shaders

shadowBlur​

readonly public shadowBlur: SimpleSignalnumberCamera
Inherited from Node.shadowBlur

shadowColor​

readonly public shadowColor: ColorSignalCamera
Inherited from Node.shadowColor

shadowOffset​

readonly public shadowOffset: Vector2SignalCameraVector2SignalContextCamera
Inherited from Node.shadowOffset

skew​

readonly public skew: Vector2SignalCameraVector2SignalContextCamera

Represents the skew of this node in local space of its parent.

Examples

Inherited from Node.skew

zIndex​

readonly public zIndex: SimpleSignalnumberCamera
Inherited from Node.zIndex

zoom​

readonly public zoom: SimpleSignalnumberCamera

The zoom level of the camera.

Default Value: 1

Accessors​

x​

public get x(): SimpleSignalnumberthis
Inherited from Node.x

y​

public get y(): SimpleSignalnumberthis
Inherited from Node.y

Methods​

[iterator]​

public [iterator](): Generatorkey: stringmeta: PropertyMetadataanysignal: SimpleSignalanyvoidvoidunknown
Inherited from Node.[iterator]

absoluteOpacity​

public absoluteOpacity(): number
Inherited from Node.absoluteOpacity

add​

public addnode: ComponentChildren: Camera

Add the given node(s) as the children of this node.

The nodes will be appended at the end of the children list.

Examples

Parameters

Inherited from Node.add

applyState​

public applyStatestate: NodeState: void
public applyStatestate: NodeStateduration: numbertiming?: TimingFunction: ThreadGenerator

Apply the given state to the node, setting all matching signal values to the provided values.

Parameters

Inherited from Node.applyState

cacheBBox​

public cacheBBox(): BBox

Get a bounding box for the contents rendered by this node as well as its children.

Inherited from Node.cacheBBox

centerOn​

public centerOnposition: PossibleVector2numberduration: numbertimingFunction?: TimingFunctioninterpolationFunction?: InterpolationFunctionVector2any[]: ThreadGenerator
public centerOnnode: Nodeduration: numbertimingFunction?: TimingFunctioninterpolationFunction?: InterpolationFunctionVector2any[]: ThreadGenerator

Centers the camera on the specified position without changing the zoom level.

Parameters

childAs​

public childAsT extends NodeT = Nodeindex: number: nullT

Get the nth children cast to the specified type.

Type Parameters

Parameters

  • index: number

    The index of the child to retrieve.

Inherited from Node.childAs

childrenAs​

public childrenAsT extends NodeT = Node(): T[]

Get the children array cast to the specified type.

Type Parameters

Inherited from Node.childrenAs

clone​

public clonecustomProps: NodeState = {}: Camera

Create a copy of this node.

Parameters

Inherited from Node.clone

compositeToLocal​

public compositeToLocal(): DOMMatrix
Inherited from Node.compositeToLocal

compositeToWorld​

public compositeToWorld(): DOMMatrix

A matrix mapping composite space to world space.

Certain effects such as blur and shadows ignore the current transformation. This matrix can be used to transform their parameters so that the effect appears relative to the closest composite root.

Inherited from Node.compositeToWorld

dispose​

public dispose(): void

Prepare this node to be disposed of.

This method is called automatically when a scene is refreshed. It will be called even if the node is not currently attached to the tree.

The goal of this method is to clean any external references to allow the node to be garbage collected.

Inherited from Node.dispose

drawOverlay​

public drawOverlaycontext: CanvasRenderingContext2Dmatrix: DOMMatrix: void

Draw an overlay for this node.

The overlay for the currently inspected node is displayed on top of the canvas.

The provided context is in screen space. The local-to-screen matrix can be used to transform all shapes that need to be displayed. This approach allows to keep the line widths and gizmo sizes consistent, no matter how zoomed-in the view is.

Parameters

Inherited from Node.drawOverlay

findAll​

public findAllT extends NodeTpredicate: node: any => node is T: T[]
public findAllT extends NodeT = Nodepredicate: node: any => boolean: T[]

Find all descendants of this node that match the given predicate.

Type Parameters

Parameters

  • predicate: node: any => node is T

    A function that returns true if the node matches.

Inherited from Node.findAll

findAncestor​

public findAncestorT extends NodeTpredicate: node: Node => node is T: nullT
public findAncestorT extends NodeT = Nodepredicate: node: Node => boolean: nullT

Find the closest ancestor of this node that matches the given predicate.

Type Parameters

Parameters

Inherited from Node.findAncestor

findFirst​

public findFirstT extends NodeTpredicate: node: Node => node is T: nullT
public findFirstT extends NodeT = Nodepredicate: node: Node => boolean: nullT

Find the first descendant of this node that matches the given predicate.

Type Parameters

Parameters

Inherited from Node.findFirst

findLast​

public findLastT extends NodeTpredicate: node: Node => node is T: nullT
public findLastT extends NodeT = Nodepredicate: node: Node => boolean: nullT

Find the last descendant of this node that matches the given predicate.

Type Parameters

Parameters

Inherited from Node.findLast

followCurve​

public followCurvecurve: Curveduration: numbertiming: TimingFunction = easeInOutCubic: ThreadGenerator

Makes the camera follow a path specified by the provided curve.

This will not change the orientation of the camera. To make the camera orient itself along the curve, use followCurveWithRotation or followCurveWithRotationReverse.

If you want to follow the curve in reverse, use followCurveReverse.

Parameters

followCurveReverse​

public followCurveReversecurve: Curveduration: numbertiming: TimingFunction = easeInOutCubic: GeneratorvoidThreadGeneratorPromiseanyPromisableanyvoidany

Makes the camera follow a path specified by the provided curve in reverse.

This will not change the orientation of the camera. To make the camera orient itself along the curve, use followCurveWithRotation or followCurveWithRotationReverse.

If you want to follow the curve forward, use followCurve.

Parameters

followCurveWithRotation​

public followCurveWithRotationcurve: Curveduration: numbertiming: TimingFunction = easeInOutCubic: GeneratorvoidThreadGeneratorPromiseanyPromisableanyvoidany

Makes the camera follow a path specified by the provided curve while pointing the camera the direction of the tangent.

To make the camera follow the curve without changing its orientation, use followCurve or followCurveReverse.

If you want to follow the curve in reverse, use followCurveWithRotationReverse.

Parameters

followCurveWithRotationReverse​

public followCurveWithRotationReversecurve: Curveduration: numbertiming: TimingFunction = easeInOutCubic: GeneratorvoidThreadGeneratorPromiseanyPromisableanyvoidany

Makes the camera follow a path specified by the provided curve in reverse while pointing the camera the direction of the tangent.

To make the camera follow the curve without changing its orientation, use followCurve or followCurveReverse.

If you want to follow the curve forward, use followCurveWithRotation.

Parameters

getState​

public getState(): NodeState

Return a snapshot of the node's current signal values.

This method will calculate the values of any reactive properties of the node at the time the method is called.

Inherited from Node.getState

hit​

public override hitposition: Vector2: nullNode

Try to find a node intersecting the given position.

Parameters

Overwrites Node.hit

insert​

public insertnode: ComponentChildrenindex: number = 0: Camera

Insert the given node(s) at the specified index in the children list.

Examples

Parameters

Inherited from Node.insert

instantiate​

public instantiateprops: NodeProps = {}: Camera

Create an instance of this node's class.

Parameters

Inherited from Node.instantiate

localToParent​

public localToParent(): DOMMatrix

Get the local-to-parent matrix for this node.

This matrix transforms vectors from local space of this node to local space of this node's parent.

Inherited from Node.localToParent

localToWorld​

public localToWorld(): DOMMatrix

Get the local-to-world matrix for this node.

This matrix transforms vectors from local space of this node to world space.

Examples

Inherited from Node.localToWorld

move​

public moveby: number = 1: Camera

Rearrange this node in relation to its siblings.

Children are rendered starting from the beginning of the children list. We can change the rendering order by rearranging said list.

A positive by arguments move the node up (it will be rendered on top of the elements it has passed). Negative values move it down.

Parameters

  • by: number = 1

    Number of places by which the node should be moved.

Inherited from Node.move

moveAbove​

public moveAbovenode: NodedirectlyAbove: boolean = false: Camera

Move the node above the provided node in the parent's layout.

The node will be moved above the provided node and from then on will be rendered on top of it. By default, if the node is already positioned higher than the sibling node, it will not get moved.

Parameters

  • node: Node

    The sibling node below which to move.

  • directlyAbove: boolean = false

    Whether the node should be positioned directly above the sibling. When true, will move the node even if it is already positioned above the sibling.

Inherited from Node.moveAbove

moveBelow​

public moveBelownode: NodedirectlyBelow: boolean = false: Camera

Move the node below the provided node in the parent's layout.

The node will be moved below the provided node and from then on will be rendered below it. By default, if the node is already positioned lower than the sibling node, it will not get moved.

Parameters

  • node: Node

    The sibling node below which to move.

  • directlyBelow: boolean = false

    Whether the node should be positioned directly below the sibling. When true, will move the node even if it is already positioned below the sibling.

Inherited from Node.moveBelow

moveDown​

public moveDown(): Camera

Move the node down in relation to its siblings.

The node will exchange places with the sibling right below it (if any) and from then on will be rendered under it.

Inherited from Node.moveDown

moveTo​

public moveToindex: number: Camera

Move the node to the provided position relative to its siblings.

If the node is getting moved to a lower position, it will be placed below the sibling that's currently at the provided index (if any). If the node is getting moved to a higher position, it will be placed above the sibling that's currently at the provided index (if any).

Parameters

  • index: number

    The index to move the node to.

Inherited from Node.moveTo

moveToBottom​

public moveToBottom(): Camera

Move the node to the bottom in relation to its siblings.

The node will be placed at the beginning of the children list and from then on will be rendered below all of its siblings.

Inherited from Node.moveToBottom

moveToTop​

public moveToTop(): Camera

Move the node to the top in relation to its siblings.

The node will be placed at the end of the children list and from then on will be rendered on top of all of its siblings.

Inherited from Node.moveToTop

moveUp​

public moveUp(): Camera

Move the node up in relation to its siblings.

The node will exchange places with the sibling right above it (if any) and from then on will be rendered on top of it.

Inherited from Node.moveUp

parentAs​

public parentAsT extends NodeT = Node(): nullT

Get the parent cast to the specified type.

Type Parameters

Inherited from Node.parentAs

parentToWorld​

public parentToWorld(): DOMMatrix

Get the parent-to-world matrix for this node.

This matrix transforms vectors from local space of this node's parent to world space.

Inherited from Node.parentToWorld

peekChildren​

public peekChildren(): readonly Node[]

Get the current children of this node.

Unlike children, this method does not have any side effects. It does not register the children signal as a dependency, and it does not spawn any children. It can be used to safely retrieve the current state of the scene graph for debugging purposes.

Inherited from Node.peekChildren

reactiveClone​

public reactiveClonecustomProps: NodeState = {}: Camera

Create a reactive copy of this node.

A reactive copy has all its properties dynamically updated to match the source node.

Parameters

Inherited from Node.reactiveClone

remove​

public remove(): Camera

Remove this node from the tree.

Inherited from Node.remove

removeChildren​

public removeChildren(): Camera

Remove all children of this node.

Inherited from Node.removeChildren

render​

public rendercontext: CanvasRenderingContext2D: void

Render this node onto the given canvas.

Parameters

Inherited from Node.render

reparent​

public reparentnewParent: Node: Camera

Change the parent of this node while keeping the absolute transform.

After performing this operation, the node will stay in the same place visually, but its parent will be changed.

Parameters

Inherited from Node.reparent

reset​

public resetduration: numbertimingFunction: TimingFunction = easeInOutCubic: ThreadGenerator

Resets the camera's position, rotation and zoom level to their original values.

Parameters

restore​

public restore(): void
public restoreduration: numbertiming?: TimingFunction: ThreadGenerator

Restore the node to its last saved state.

This method can be used together with the save method to restore a node to a previously saved state. Restoring a node to a previous state removes that state from the state stack.

Examples

Inherited from Node.restore

save​

public save(): void

Push a snapshot of the node's current state onto the node's state stack.

This method can be used together with the restore method to save a node's current state and later restore it. It is possible to store more than one state by calling save method multiple times.

Inherited from Node.save

snapshotClone​

public snapshotClonecustomProps: NodeState = {}: Camera

Create a copy of this node.

Unlike clone, a snapshot clone calculates any reactive properties at the moment of cloning and passes the raw values to the copy.

Parameters

Inherited from Node.snapshotClone

toPromise​

public toPromise(): PromiseCamera

Wait for any asynchronous resources that this node or its children have.

Certain resources like images are always loaded asynchronously. Awaiting this method makes sure that all such resources are done loading before continuing the animation.

Inherited from Node.toPromise

view​

public view(): View2D
Inherited from Node.view

worldToLocal​

public worldToLocal(): DOMMatrix

Get the world-to-local matrix for this node.

This matrix transforms vectors from world space to local space of this node.

Examples

Inherited from Node.worldToLocal

worldToParent​

public worldToParent(): DOMMatrix

Get the world-to-parent matrix for this node.

This matrix transforms vectors from world space to local space of this node's parent.

Inherited from Node.worldToParent

Stage​

static public Stage{...}: RectPropscameraRef?: ReferenceCamerascene?: Node: Rect

Parameters