Extends
Members
_active :Boolean
- Source:
- Overrides:
Track whether the canvas layer is currently active for interaction
Type:
- Boolean
_blurDistance :number|null
- Source:
The blur distance for soft shadows
Type:
- number | null
_channels :Object|null
- Source:
The lighting channels which are an input to the ShadowMap
Type:
- Object | null
_cull :Array.<number>
- Source:
An Array which specifies the cull multiplier, minimum, and maximum distance to use This depends dynamically on the number of walls in the Scene
Type:
- Array.<number>
_fogResolution :number|null
- Source:
The downscaling resolution used for the saved fog texture
Type:
- number | null
alphas :Object|null
- Source:
Configure the opacity levels used for each channel of the lighting map
Type:
- Object | null
blurDistance
- Source:
A getter to retrieve the current value of blur distance
blurDistance
- Source:
A setter to apply a new blur distance value
fogData :Object
- Source:
Fog of War data object
Type:
- Object
fogExploration :boolean
- Source:
Does the currently viewed Scene support fog of war exploration?
Type:
- boolean
sources :Object.<Map>
- Source:
A mapping of the sources of lighting and vision which are active within the rendered Scene
Type:
- Object.<Map>
tokenVision :boolean
- Source:
Does the currently viewed Scene support Token field of vision?
Type:
- boolean
Methods
(static) _castSightRays() → {Array}
- Source:
A helper method responsible for casting rays at wall endpoints Rays are restricted by allowed angles and culling distance
Returns:
An array of Ray objects
- Type
- Array
(static) computeSight(origin, radius, minAngle, maxAngle, cullDistance, cullMult, density, walls) → {Object}
- Source:
Evaluate the sight polygons for a given origin position and vision radius This method generates two polygons - one for line of sight, and another for field of vision The line-of-sight polygon defines the unrestricted area of visibility for the source The field-of-vision polygon defines the restricted area of visibility for the source
Parameters:
| Name | Type | Description |
|---|---|---|
origin |
Object | An object with coordinates x and y representing the origin of the test |
radius |
Number | A distance in canvas position units which reflects the visible range |
minAngle |
Number | The minimum angle of restricted sight or light emission |
maxAngle |
Number | The maximum angle of restricted sight or light emission |
cullDistance |
Number | The minimum number of grid spaces after which to begin culling walls. |
cullMult |
Number | The multiplier on the provided radius against which to cull wall endpoint checks. Default is 2 |
density |
Number | The density in degrees to which to guarantee that rays are broadcast. Default is 6 |
walls |
Array | A specific Array of Walls to test collision against |
Returns:
An Array of Ray objects, and the two vision polygons
- Type
- Object
(async) _onResetFog(resetData) → {Promise}
- Source:
If fog of war data is reset from the server, re-draw the canvas
Parameters:
| Name | Type | Description |
|---|---|---|
resetData |
Object | Fog reset data sent by the server |
Returns:
- Type
- Promise
(async) draw() → {Promise.<CanvasLayer>}
- Source:
- Overrides:
Draw the canvas layer, rendering its internal components and returning a Promise The Promise resolves to the drawn layer once its contents are successfully rendered.
Returns:
- Type
- Promise.<CanvasLayer>
(async) initialize()
- Source:
Initialize the Sight Layer. Initialization has the following hierarchical workflow:
Initialize Layer (reset entire layer) InitializeLights (used to reset all lights) UpdateLight (update a single light) InitializeTokens (reset all tokens) UpdateToken (update a single token) Initialize Fog (reset FOW state)
(async) initializeFog() → {Promise}
- Source:
Initialize fog of war - resetting it when switching scenes or re-drawing the canvas
Returns:
- Type
- Promise
initializeLights()
- Source:
Initialize the sight layer for all AmbientLight based sources. This method calls the SightLayer#updateLight function for each Ambient Light object.
initializeTokens()
- Source:
Initialize the sight layer for all Token based sources. This method calls the SightLayer#updateToken function for each Token object.
(async) loadFog() → {Promise}
- Source:
Load existing fog of war data from local storage and populate the initial exploration sprite
Returns:
- Type
- Promise
(async) resetFog()
- Source:
Reset the fog of war by clearing current exploration progress This approach currently takes the nuclear option of clearing any saved fog and redrawing the entire canvas It's not that inefficient, so it could be worth just keeping it this way for simplicity
restrictVisibility()
- Source:
Restrict the visibility of certain canvas assets (like Tokens or DoorControls) based on the visibility polygon These assets should only be displayed if they are visible given the current player's field of view
(async) tearDown()
- Source:
- Overrides:
Deconstruct data used in the current layer in preparation to re-draw the canvas
testVisibility(point, tolerance) → {boolean}
- Source:
Test whether a point on the Canvas is visible based on the current vision and LOS polygons
Parameters:
| Name | Type | Description |
|---|---|---|
point |
Object | PIXI.Point | The point in space to test. This can be an Object with x and y coordinates or a Point object. |
tolerance |
number | A numeric radial offset which allows for a non-exact match. For example, if tolerance is 2 then the test will pass if the point is within 2px of a vision polygon. |
Returns:
Whether the point is currently visible.
- Type
- boolean
update()
- Source:
Update the display of the sight layer. Organize sources into rendering queues and draw lighting containers for each source
updateFog(x, y, radius, limit, force)
- Source:
Update the fog layer when a player token reaches a board position which was not previously explored
Parameters:
| Name | Type | Description |
|---|---|---|
x |
Number | The origin x-coordinate from which to update fog exploration |
y |
Number | The origin y-coordinate from which to update fog exploration |
radius |
Number | The vision radius of the exploration from this point |
limit |
Boolean | Was the position explored by a limited viewpoint? |
force |
Boolean | Force the fog location to be updated even if it is not a larger radius |
updateLight(light, defer, deleted, walls)
- Source:
Update lighting data for a single light source, storing it as a source in the Sight Layer
Parameters:
| Name | Type | Description |
|---|---|---|
light |
AmbientLight | The light object being rendered |
defer |
boolean | Defer rendering the update until later? Default is false |
deleted |
boolean | An optional flag which denotes that the light object has been deleted |
walls |
Array | Optionally pass an array of Walls which block vision for efficient computation |
updateToken(token, defer, deleted, walls, updateFog)
- Source:
Update lighting data for a single Token source, storing it as a source in the Sight Layer
Parameters:
| Name | Type | Description |
|---|---|---|
token |
Token | The Token object being rendered |
defer |
boolean | Defer rendering the update until later? Default is false |
deleted |
boolean | An optional flag which denotes that the Token object has been deleted |
walls |
Array | Optionally pass an array of Walls which block vision for efficient computation |
updateFog |
boolean | Update fog exploration progress for the current Token position? |