API reference

Every public class, method, and event in @codexo/exojs. Generated from source.

C

classLineLight

@codexo/exojs-lighting / lighting / stable

A segment that emits: a neon tube, a light strip, a laser. Falloff is measured from the nearest point on the segment, so the pool of light is a capsule rather than a disc. ```ts sign.addChild(new LineLight({ length: 120, color: Color.cyan })); ``` The segment runs along the node's own rotation and is centred on it, so aiming a tube is rotating it and moving one is moving the node. # Renderers `lightmap` and `radiance` light the capsule. `forward` shades inside the sprite stage, where a light is a position and a radius, and so lights a line light as a point at its centre whose radius is the whole reach. # Shadows The shadow map is polar around the segment's CENTRE, the same as for a point light. That is exact for a fragment the segment subtends little of, and approximate near a long tube's ends, where a physically lit occluder would be lit from many points along the segment at once. LightOptions.softness is the knob that stands in for it.

39
props
35
methods
14
events
Import
import { LineLight } from '@codexo/exojs-lighting'

A segment that emits: a neon tube, a light strip, a laser. Falloff is measured from the nearest point on the segment, so the pool of light is a capsule rather than a disc.

```ts sign.addChild(new LineLight({ length: 120, color: Color.cyan })); ```

The segment runs along the node's own rotation and is centred on it, so aiming a tube is rotating it and moving one is moving the node.

# Renderers

`lightmap` and `radiance` light the capsule. `forward` shades inside the sprite stage, where a light is a position and a radius, and so lights a line light as a point at its centre whose radius is the whole reach.

# Shadows

The shadow map is polar around the segment's CENTRE, the same as for a point light. That is exact for a fragment the segment subtends little of, and approximate near a long tube's ends, where a physically lit occluder would be lit from many points along the segment at once. LightOptions.softness is the knob that stands in for it.

Constructors1
new(options: LineLightOptionsConstruction options for LineLight. Every field is also mutable afterwards.): LineLight
Methods35
_collectContent(_builder: RenderPlanBuilder): void
Part of the renderer SDK contract for extension renderers.
addFilter(filter: FilterAbstract base class for post-process filters applied to a drawable's render output. Filters are rendered into a temporary RenderTexture (the `output`) that is…): this
blur(): this
Release keyboard focus from this node if it currently holds it.
clearFilters(): this
collect(builder: RenderPlanBuilder, seq?: number): void
Contribute this node to the render plan under construction: skip it when it is destroyed, invisible, or outside the builder's cull rect, otherwise emit it as one plan entry. Custom node types override this to add their own admission rules and must call super.collect(builder, seq) to keep the skip semantics. seq orders the entry within its parent; omit it to append. Part of the renderer SDK contract for extension renderers.
collidesWith(target: CollidableContract for objects that participate in collision detection. Implemented by all concrete shape classes as well as `SceneNode`.): CollisionResponseResult of a successful Collidable.collidesWith call. Contains the two participating shapes, the penetration depth, containment flags, and the minimum-translati… | null
Compute a full CollisionResponse between this shape and target. Returns null in two cases: - the shapes do not overlap, **or** - the specific shape-pair combination does not support response generation (e.g. Line against any shape, Ellipse against Ellipse or Polygon). Use intersectsWith for a universal boolean overlap check that works across all supported shape pairs.
contains(x: number, y: number): boolean
Hit-test the world-space point (x, y) against this node, honouring hitArea: with one set, the point is mapped into local space and tested against the shape; without one, the inherited bounds/oriented-box test applies. A subclass that overrides this with its own geometry test must forward to super.contains while hitArea is set, or the override silently defeats the caller's pick shape.
destroy(): void
Releases everything this node owns, including GPU-side resources. Calling it is mandatory for a node that has acted as a render root: from its first recorded frame such a node owns a group-scoped instance, transform and tint buffer, and the backend holds that bundle until the node is destroyed or the backend itself is. Dropping the last reference is not enough - GPU lifetime is deterministic here on purpose and is not tied to garbage collection. Idempotent: a second call is a no-op.
focus(): this
Request keyboard focus for this node through its owning focus service.
getBounds(out?: RectangleMutable axis-aligned rectangle defined by a top-left origin `(x, y)` and dimensions `(width, height)`. Implements Collidable with full SAT collision response f…): RectangleMutable axis-aligned rectangle defined by a top-left origin `(x, y)` and dimensions `(width, height)`. Implements Collidable with full SAT collision response f…
Axis-aligned bounding box of this node in its GLOBAL-transform space. That is world space for ordinary nodes, but GROUP-LOCAL space for nodes inside an engaged RetainedContainer transform group (the group matrix is applied on the GPU, not here) - this is deliberate and matches the rendering convention. For a true world-space extent of such a node, lift this rect by the group's getWorldTransform matrix. Pass out to receive a copy you own. Without it the return value is this node's **cached** rectangle, rebuilt in place whenever the transform or the local extent changes - retaining it across frames hands you a value that silently moves. The cache is why the no-arg form does not allocate: this runs per node per frame for culling and hit-testing.
getGlobalTransform(): MatrixMutable 3×3 row-major affine transformation matrix used throughout the rendering and physics pipeline. Layout (row, column): ``` | a b x | | c d y | | e f z |…
getLocalBounds(): ReadonlyRectangleRead-only view of a Rectangle: every accessor and non-mutating query a rectangle offers, with none of its writers. Returned by APIs that hand out a LIVE intern…
This node's untransformed extent in its own local coordinate space. Returns the LIVE internal rectangle, not a copy: it is read on hot paths (updateBounds re-reads it on every transform-dirty recompute, i.e. potentially every frame for a moving node), so copying it here would add a per-frame allocation. It is therefore typed as a ReadonlyRectangle - reads are unchanged, writes are rejected at compile time. Writing to it directly would skip the bounds/content invalidation the engine needs, leaving culling, hit-testing and retained render fragments on a stale extent. A custom Drawable that owns its own size sets it through setLocalBounds, which writes and invalidates in one step.
getNormals(): VectorConcrete mutable 2D vector with full AbstractVector arithmetic and Collidable collision support (treated as a point collider). `Vector.temp` provides a shared…[]
Return the outward-facing edge normals used by the SAT solver. The array should be cached and reused across calls.
getTransform(): MatrixMutable 3×3 row-major affine transformation matrix used throughout the rendering and physics pipeline. Layout (row, column): ``` | a b x | | c d y | | e f z |…
getWorldDirection(out: { x: number; y: number }): void
The light's own axis in world space, as a unit vector written into out - the node's world rotation. It is what a cone points along and what a segment runs along, so aiming a light is the same act as rotating whatever carries it. A shape with no direction of its own still has one, and uses it to orient its cookie.
getWorldPosition(out: { x: number; y: number }): void
World-space position, taken from the node's own transform - the reason a light is a node at all. Written into out to keep the per-frame publish allocation-free.
getWorldTransform(): MatrixMutable 3×3 row-major affine transformation matrix used throughout the rendering and physics pipeline. Layout (row, column): ``` | a b x | | c d y | | e f z |…
The node's TRUE world-space transform, composed through every transform-group boundary (RetainedContainer) in the ancestor chain. getGlobalTransform deliberately stops at the nearest engaged boundary (descendants resolve group-RELATIVE transforms; the renderer multiplies the group matrix back in on the GPU), so it is the right space for rendering but the wrong one for spatial queries. Use THIS accessor whenever a real world position/orientation is needed - picking, spatial audio, physics, world-space math against nodes outside the group. Without any engaged boundary ancestor it returns the exact getGlobalTransform matrix (same instance, no extra work). With one, it lazily caches groupLocal × groupWorld and revalidates on read via version/stamp compares - including runtime space flips such as RetainedContainer's deep-barrier sub-branch escape.
intersectsWith(target: CollidableContract for objects that participate in collision detection. Implemented by all concrete shape classes as well as `SceneNode`.): boolean
Test whether this shape overlaps target using a fast boolean algorithm (no penetration depth or normal computed). Prefer this over collidesWith when only the yes/no result is needed.
invalidateCache(): this
invalidateContent(): this
Mark this node's visual content dirty without going through a standard setter - e.g. a custom Drawable subclass backed by externally mutable data (the pattern TileChunkNode in @codexo/exojs-tilemap already uses via its own _chunk.revision compare). Call this after mutating such state so the Track-B retained-plan skip does not serve a stale frame for this node.
inView(view: View2D camera that defines what region of the world is visible on screen. Maintains a center position, a visible area size, a rotation, and an optional zoom level.…): boolean
move(x: number, y: number): this
project(axis: VectorConcrete mutable 2D vector with full AbstractVector arithmetic and Collidable collision support (treated as a point collider). `Vector.temp` provides a shared…, result: IntervalA closed scalar interval `[min, max]` used by the SAT collision solver to represent the projection of a shape onto a separating axis. `Interval.temp` provides…): IntervalA closed scalar interval `[min, max]` used by the SAT collision solver to represent the projection of a shape onto a separating axis. `Interval.temp` provides…
Project this shape onto axis and write the scalar min/max into interval. Used internally by the SAT solver.
removeFilter(filter: FilterAbstract base class for post-process filters applied to a drawable's render output. Filters are rendered into a temporary RenderTexture (the `output`) that is…): this
render(backend: RenderBackend): this
Raw rendering entry point. Direct backend access - bypasses the RenderPlan pipeline machinery. Prefer the high-level RenderingContext.render path via the owning RenderingContext wherever possible.
rotate(degrees: number): this
setLocalBounds(x: number, y: number, width: number, height: number): this
Write this node's local extent and run the bounds invalidation the change implies - the node's own bounds flag, the ancestor bounds cascade, and the content-dirty stamp that keeps retained fragments from replaying the old extent. This is the only supported way to resize a node from outside getLocalBounds; the rectangle itself is handed out read-only so the invalidation cannot be forgotten. Built-in drawables (Sprite, Text, BitmapText, Mesh, ...) and custom ones alike go through here. Part of the renderer SDK contract for extension renderers.
setOrigin(x: number, y: number): this
setPosition(x: number, y: number): this
setRotation(degrees: number): this
setScale(x: number, y: number): this
setSkew(x: number, y: number): this
updateBounds(): this
updateParentTransform(): this
updateTransform(): this
Properties39
collisionType: CollisionTypeDiscriminant tag carried by every Collidable so that intersection and collision routines can dispatch to the correct algorithm without `instanceof` checks.
color: Color32-bit RGBA color value with channel-wise accessors. Red, green, and blue are integers in 0..255; alpha is a float in 0..1. Out-of-range values are saturated o…
Light colour. Mutated in place or replaced; read once per frame.
cookie: TextureA static GPU texture sourced from an image, canvas, or video element. Holds the pixel source, its sampling state (ScaleModes, WrapModes) and its upload state (… | null
Texture the light is shone through, or null. See LightOptions.cookie.
cursor: null | string
draggable: boolean
When true and interactive is also true, this node will be automatically repositioned to follow the pointer during a drag gesture. The framework captures the pointer offset at drag-start so the node doesn't snap to the cursor position. Both interactive and draggable must be set for dragging to work - a draggable but non-interactive node will never receive pointerdown and therefore cannot start a drag.
enabled: boolean
When false, the light is skipped entirely rather than published as black.
flags: FlagsType-safe bitfield utility for managing sets of numeric enum flags. `T` should be a numeric const-enum or a type whose values are `number`. Internally stores t…<SceneNodeTransformFlags>
focusable: boolean
When true, this node can receive keyboard focus - via focus, Tab traversal, or app.interaction.focus(node) - and is delivered key events through onKeyDown / onKeyUp while focused, or while any of its descendants holds focus (key events bubble up the parent chain like pointer InteractionEvents do). A Widget additionally has to be enabled: disabling one takes it out of the Tab order and rejects programmatic focus, without touching this flag.
height: number
Height above the sprite plane, in pixels.
hitArea: HitAreaAcceptable shapes for RenderNode.hitArea, expressed in the node's own local space: a Rectangle, Circle, Ellipse or Polygon, or `null` for no override. A `Polyg…
Optional pick shape in this node's LOCAL space, replacing the bounds test contains would otherwise perform. Defaults to null. The world-space point is mapped through the inverse of the node's global transform before the shape is tested, so the region follows the node's position, rotation, scale and skew like the rendered output does - the shape itself is never re-transformed and never needs updating when the node moves. Affects picking only. Bounds, culling and rendering ignore it entirely, and because the interaction system finds candidates by their bounds, a hit area reaching outside the node's bounds is only reliably picked where the two overlap. Use it to shrink or reshape a pick region, not to grow one. The shape is the caller's: it is read live on every hit test, so mutating it in place takes effect immediately, and the node never destroys it.
intensity: number
Linear brightness multiplier.
length: number
Length of the emitting segment in pixels.
name: null | string
Optional human-readable identity for this node. Defaults to null. Purely a label the engine never interprets: useful for debugging, find-by-name lookups, prefab references, and as a stable key when merging serialized state back onto an existing tree. Not required to be unique.
radius: number
Distance from the segment at which the light contributes nothing.
softness: number
How soft this light's shadows are, in 0..1. See LightOptions.softness.
tabIndex: number
Tab-traversal order among focusable nodes in the same focus scope. Lower values are visited first; equal values keep document (tree) order.
cacheAsTexture: boolean
Bake this node's subtree into a RenderTexture once and replay that texture until the subtree changes, instead of walking and drawing it every frame. Worth it for a subtree that is expensive to draw and rarely changes. The cache is invalidated by anything that moves the node's world bounds - the node's own transform included - so a node that animates re-bakes every frame and is strictly slower than not caching it at all. Setting it to false frees the texture immediately.
cacheResolution: TargetResolution
Resolution the cacheAsTexture texture is baked at, in device pixels per logical unit. 'inherit' (the default) matches the surface the cache is composited into, so enabling the cache does not soften the picture on a HiDPI display. Pin it to a number to trade sharpness for memory and bake cost - a cache is resolution² texels, so 1 on a DPR-3 phone is a ninth of the VRAM and a ninth of the fill per re-bake. Changing it invalidates the cache.
clip: boolean
When true, descendants are geometrically clipped to clipShape. Unlike mask (which is alpha/visibility masking), clip is a hard geometric boundary: - clipShape === null - clip to this node's world-space bounds (getBounds), using the GPU scissor fast path. - clipShape is a Rectangle - clip to that world-space rectangle via scissor. - clipShape is a Geometry - clip to the geometry's silhouette via the stencil buffer (WebGL2). Only fragments inside the shape survive. Clipping wraps the node's final (filtered/masked) output and acts as a render barrier: draw commands are never reordered or batched across the clip boundary.
clipShape: GeometryNon-renderable geometry data object used by advanced rendering paths. Geometry owns only vertex/index data and its layout metadata; it is not a scene node, has… | RectangleMutable axis-aligned rectangle defined by a top-left origin `(x, y)` and dimensions `(width, height)`. Implements Collidable with full SAT collision response f… | null
Clip region used when clip is true. A Rectangle (or null for the node's bounds) maps to the scissor fast path; a Geometry maps to the stencil path. Has no effect while clip is false.
cullable: boolean
When false, this node is never culled by the viewport check and is always considered in-view. Defaults to true.
cullArea: RectangleMutable axis-aligned rectangle defined by a top-left origin `(x, y)` and dimensions `(width, height)`. Implements Collidable with full SAT collision response f… | null
Custom rectangle used for viewport cull intersection test. When set, replaces the default node bounds in cull checks. Set to null to restore default bounds-based culling.
destroyed: boolean
true once destroy has run on this node. A destroyed node has released its pooled resources (transform/bounds), has been unlinked from its parent, renders nothing, and must not be reused or re-attached. The render plan skips a destroyed node, so even one handed straight to a renderer as a detached root contributes nothing.
filters: readonly FilterAbstract base class for post-process filters applied to a drawable's render output. Filters are rendered into a temporary RenderTexture (the `output`) that is…[]
interactive: boolean
isAlignedBox: boolean
mask: MaskSourceAcceptable mask sources for RenderNode.mask. - `Rectangle` - solid axis-aligned mask. The fastest path: implemented internally via GPU scissor / clip rect; no…
The mask source that controls visibility of this node's render output. See MaskSource for accepted source types and their semantics. Setting to null removes any active mask. Setting a RenderNode that is this is rejected (a node cannot mask itself). Indirect cycles (a.mask = b; b.mask = a) are rejected as well: the candidate's mask chain is walked and any cycle - whether it closes on this or was already present in the chain - fails the assignment.
origin: ObservableVectorAn AbstractVector subclass that notifies an owner whenever its components change. Used internally by Rectangle, `SceneNode`, View and other types to invalidate…
parent: ContainerScene-graph node that owns child RenderNodes. Renders its subtree in document order with local `zIndex` ordering resolved inside the internal render plan at pl… | null
position: ObservableVectorAn AbstractVector subclass that notifies an owner whenever its components change. Used internally by Rectangle, `SceneNode`, View and other types to invalidate…
preserveDrawOrder: boolean
When true, material-aware overlap reordering is disabled for this node's draw-order scope. Draw commands are submitted in exact document order (after scope-local z-sorting), preserving the painter's guarantee irrespective of material compatibility or AABB safety analysis. Adjacency coalescing of consecutive same-material draws still applies; it does not change visual output order.
rotation: number
Rotation angle in degrees. Wraps via trimRotation on assignment.
scale: ObservableVectorAn AbstractVector subclass that notifies an owner whenever its components change. Used internally by Rectangle, `SceneNode`, View and other types to invalidate…
skewX: number
Horizontal skew angle in degrees. Shears the node along the X axis (positive values lean the top edge right). Combines correctly with rotation and scale.
skewY: number
Vertical skew angle in degrees. Shears the node along the Y axis (positive values lean the left edge downward). Combines correctly with rotation and scale.
visible: boolean
x: number
y: number
zIndex: number
Events14
onBlur: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[RenderNodeSceneNode that can produce visual output. Adds the rendering pipeline features on top of the structural transform/bounds carried by SceneNode: post-process `fi…]>
Fired when this node loses keyboard focus.
onContextMenu: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[InteractionEventDOM-Event-shaped envelope dispatched by InteractionSystem to interactive scene nodes. Bubbles up the *entire* parent chain - `target` stays pinned to the hit-d…]>
Fired when a pointer requests a context menu over this node - right-click, or a long-press/touch gesture that has an attributable pointer. Bubbles like the other pointer events, so a scene-wide fallback can listen on an ancestor. Carries no native event - whether the browser's own menu appears is decided by ApplicationOptions.input.allowNativeContextMenu, independently of this. Requires an attributable pointer: a pointerless keyboard-only request (the context-menu key, or Shift+F10, with no pointer ever having touched the surface - see ContextMenuRequest's doc comment) has nothing to hit-test or bubble with, so it never reaches this per-node event. It only ever reaches the engine-wide, scene-graph-independent app.input.onContextMenu.
onDrag: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[InteractionEventDOM-Event-shaped envelope dispatched by InteractionSystem to interactive scene nodes. Bubbles up the *entire* parent chain - `target` stays pinned to the hit-d…]>
Fired on every pointer-move while this node is being dragged. Does not bubble.
onDragEnd: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[InteractionEventDOM-Event-shaped envelope dispatched by InteractionSystem to interactive scene nodes. Bubbles up the *entire* parent chain - `target` stays pinned to the hit-d…]>
Fired when the drag gesture ends (pointer-up or cancel). Does not bubble.
onDragStart: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[InteractionEventDOM-Event-shaped envelope dispatched by InteractionSystem to interactive scene nodes. Bubbles up the *entire* parent chain - `target` stays pinned to the hit-d…]>
Fired once when a drag gesture begins on this node. Does not bubble.
onFocus: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[RenderNodeSceneNode that can produce visual output. Adds the rendering pipeline features on top of the structural transform/bounds carried by SceneNode: post-process `fi…]>
Fired when this node gains keyboard focus.
onKeyDown: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[KeyEventEnvelope dispatched by `app.interaction` to the focused RenderNode for keyboard input, then bubbled up its entire parent chain - same DOM-style shape as Intera…]>
Fired for each key pressed while this node - or a descendant of it - holds focus. Bubbles; see KeyEvent.
onKeyUp: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[KeyEventEnvelope dispatched by `app.interaction` to the focused RenderNode for keyboard input, then bubbled up its entire parent chain - same DOM-style shape as Intera…]>
Fired for each key released while this node - or a descendant of it - holds focus. Bubbles; see KeyEvent.
onPointerDown: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[InteractionEventDOM-Event-shaped envelope dispatched by InteractionSystem to interactive scene nodes. Bubbles up the *entire* parent chain - `target` stays pinned to the hit-d…]>
onPointerMove: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[InteractionEventDOM-Event-shaped envelope dispatched by InteractionSystem to interactive scene nodes. Bubbles up the *entire* parent chain - `target` stays pinned to the hit-d…]>
onPointerOut: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[InteractionEventDOM-Event-shaped envelope dispatched by InteractionSystem to interactive scene nodes. Bubbles up the *entire* parent chain - `target` stays pinned to the hit-d…]>
onPointerOver: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[InteractionEventDOM-Event-shaped envelope dispatched by InteractionSystem to interactive scene nodes. Bubbles up the *entire* parent chain - `target` stays pinned to the hit-d…]>
onPointerTap: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[InteractionEventDOM-Event-shaped envelope dispatched by InteractionSystem to interactive scene nodes. Bubbles up the *entire* parent chain - `target` stays pinned to the hit-d…]>
onPointerUp: SignalLightweight typed event emitter. Each `Signal` represents one named notification channel (e.g. `onResize`, `onFrame`). Listeners are added with Signal.add or S…<[InteractionEventDOM-Event-shaped envelope dispatched by InteractionSystem to interactive scene nodes. Bubbles up the *entire* parent chain - `target` stays pinned to the hit-d…]>
Source
packages/exojs-lighting/src/lights/LineLight.ts