TrackAsia GL JS Docs
TrackAsiaTrackAsia GL JS DocsAPI ReferenceMap

Map

src/ui/map.ts

The Map object represents the map on your page. It exposes methods and properties that enable you to programmatically change the map, and fires events as users interact with it.

You create a Map by specifying a container and other options. Then TrackAsia GL JS initializes the map on the page and returns your Map object.

Extends Evented.
new Map class(options: Object)

Parameters

options(Object)
NameDescription
options.container
(HTMLElement | string)		The HTML element in which TrackAsia GL JS will render the map, or the element's string id . The specified element must have no children.
options.minZoom
number
default: 0
The minimum zoom level of the map (0-24).
options.maxZoom
number
default: 22
The maximum zoom level of the map (0-24).
options.minPitch
number
default: 0
The minimum pitch of the map (0-85). Values greater than 60 degrees are experimental and may result in rendering issues. If you encounter any, please raise an issue with details in the TrackAsia project.
options.maxPitch
number
default: 60
The maximum pitch of the map (0-85). Values greater than 60 degrees are experimental and may result in rendering issues. If you encounter any, please raise an issue with details in the TrackAsia project.
options.style
(Object | string)?		The map's TrackAsia style. This must be an a JSON object conforming to the schema described in the TrackAsia Style Specification , or a URL to such JSON.
options.hash
(boolean | string)
default: false
If true , the map's position (zoom, center latitude, center longitude, bearing, and pitch) will be synced with the hash fragment of the page's URL. For example, http://path/to/my/page.html#2.59/39.26/53.07/-24.1/60 . An additional string may optionally be provided to indicate a parameter-styled hash, e.g. http://path/to/my/page.html#map=2.59/39.26/53.07/-24.1/60&foo=bar , where foo is a custom parameter and bar is an arbitrary hash distinct from the map hash.
options.interactive
boolean
default: true
If false , no mouse, touch, or keyboard listeners will be attached to the map, so it will not respond to interaction.
options.bearingSnap
number
default: 7
The threshold, measured in degrees, that determines when the map's bearing will snap to north. For example, with a bearingSnap of 7, if the user rotates the map within 7 degrees of north, the map will automatically snap to exact north.
options.pitchWithRotate
boolean
default: true
If false , the map's pitch (tilt) control with "drag to rotate" interaction will be disabled.
options.clickTolerance
number
default: 3
The max number of pixels a user can shift the mouse pointer during a click for it to be considered a valid click (as opposed to a mouse drag).
options.attributionControl
boolean
default: true
If true , an AttributionControl will be added to the map.
options.customAttribution
(string | Array<string>)?		String or strings to show in an AttributionControl . Only applicable if options.attributionControl is true .
options.maplibreLogo
boolean
default: false
If true , the TrackAsia logo will be shown.
options.logoPosition
string
default: 'bottom-left'
A string representing the position of the TrackAsia wordmark on the map. Valid options are top-left , top-right , bottom-left , bottom-right .
options.failIfMajorPerformanceCaveat
boolean
default: false
If true , map creation will fail if the performance of TrackAsia GL JS would be dramatically worse than expected (i.e. a software renderer would be used).
options.preserveDrawingBuffer
boolean
default: false
If true , the map's canvas can be exported to a PNG using map.getCanvas().toDataURL() . This is false by default as a performance optimization.
options.antialias
boolean?		If true , the gl context will be created with MSAA antialiasing, which can be useful for antialiasing custom layers. this is false by default as a performance optimization.
options.refreshExpiredTiles
boolean
default: true
If false , the map won't attempt to re-request tiles once they expire per their HTTP cacheControl / expires headers.
options.maxBounds
LngLatBoundsLike?		If set, the map will be constrained to the given bounds.
options.scrollZoom
(boolean | Object)
default: true
If true , the "scroll to zoom" interaction is enabled. An Object value is passed as options to ScrollZoomHandler#enable .
options.boxZoom
boolean
default: true
If true , the "box zoom" interaction is enabled (see BoxZoomHandler ).
options.dragRotate
boolean
default: true
If true , the "drag to rotate" interaction is enabled (see DragRotateHandler ).
options.dragPan
(boolean | Object)
default: true
If true , the "drag to pan" interaction is enabled. An Object value is passed as options to DragPanHandler#enable .
options.keyboard
boolean
default: true
If true , keyboard shortcuts are enabled (see KeyboardHandler ).
options.doubleClickZoom
boolean
default: true
If true , the "double click to zoom" interaction is enabled (see DoubleClickZoomHandler ).
options.touchZoomRotate
(boolean | Object)
default: true
If true , the "pinch to rotate and zoom" interaction is enabled. An Object value is passed as options to TwoFingersTouchZoomRotateHandler#enable .
options.touchPitch
(boolean | Object)
default: true
If true , the "drag to pitch" interaction is enabled. An Object value is passed as options to TwoFingersTouchPitchHandler#enable .
options.cooperativeGestures
(boolean | GestureOptions)
default: undefined
If true or set to an options object, map is only accessible on desktop while holding Command/Ctrl and only accessible on mobile with two fingers. Interacting with the map using normal gestures will trigger an informational screen. With this option enabled, "drag to pitch" requires a three-finger gesture. Cooperative gestures are disabled when a map enters fullscreen using #FullscreenControl .
options.trackResize
boolean
default: true
If true , the map will automatically resize when the browser window resizes.
options.center
LngLatLike
default: [0,0]
The initial geographical centerpoint of the map. If center is not specified in the constructor options, TrackAsia GL JS will look for it in the map's style object. If it is not specified in the style, either, it will default to [0, 0] Note: TrackAsia GL JS uses longitude, latitude coordinate order (as opposed to latitude, longitude) to match GeoJSON.
options.zoom
number
default: 0
The initial zoom level of the map. If zoom is not specified in the constructor options, TrackAsia GL JS will look for it in the map's style object. If it is not specified in the style, either, it will default to 0 .
options.bearing
number
default: 0
The initial bearing (rotation) of the map, measured in degrees counter-clockwise from north. If bearing is not specified in the constructor options, TrackAsia GL JS will look for it in the map's style object. If it is not specified in the style, either, it will default to 0 .
options.pitch
number
default: 0
The initial pitch (tilt) of the map, measured in degrees away from the plane of the screen (0-85). If pitch is not specified in the constructor options, TrackAsia GL JS will look for it in the map's style object. If it is not specified in the style, either, it will default to 0 . Values greater than 60 degrees are experimental and may result in rendering issues. If you encounter any, please raise an issue with details in the TrackAsia project.
options.bounds
LngLatBoundsLike?		The initial bounds of the map. If bounds is specified, it overrides center and zoom constructor options.
options.fitBoundsOptions
Object?		A Map#fitBounds options object to use only when fitting the initial bounds provided above.
options.renderWorldCopies
boolean
default: true
If true , multiple copies of the world will be rendered side by side beyond -180 and 180 degrees longitude. If set to false :
  • When the map is zoomed out far enough that a single representation of the world does not fill the map's entire container, there will be blank space beyond 180 and -180 degrees longitude.
  • Features that cross 180 and -180 degrees longitude will be cut in two (with one portion on the right edge of the map and the other on the left edge of the map) at every zoom level.
options.maxTileCacheSize
number
default: null
The maximum number of tiles stored in the tile cache for a given source. If omitted, the cache will be dynamically sized based on the current viewport which can be set using maxTileCacheZoomLevels constructor options.
options.maxTileCacheZoomLevels
number
default: 5
The maximum number of zoom levels for which to store tiles for a given source. Tile cache dynamic size is calculated by multiplying maxTileCacheZoomLevels with approx number of tiles in the viewport for a given source.
options.validateStyle
boolean
default: true
If false, style validation will be skipped. Useful in production environment.
options.localIdeographFontFamily
string
default: 'sans-serif'
Defines a CSS font-family for locally overriding generation of glyphs in the 'CJK Unified Ideographs', 'Hiragana', 'Katakana' and 'Hangul Syllables' ranges. In these ranges, font settings from the map's style will be ignored, except for font-weight keywords (light/regular/medium/bold). Set to false , to enable font settings from the map's style for these glyph ranges. The purpose of this option is to avoid bandwidth-intensive glyph server requests. (See Use locally generated ideographs .)
options.transformRequest
RequestTransformFunction
default: null
A callback run before the Map makes a request for an external URL. The callback can be used to modify the url, set headers, or set the credentials property for cross-origin requests. Expected to return an object with a url property and optionally headers and credentials properties.
options.transformCameraUpdate
CameraUpdateTransformFunction
default: null
A callback run before the Map's camera is moved due to user input or animation. The callback can be used to modify the new center, zoom, pitch and bearing. Expected to return an object containing center, zoom, pitch or bearing values to overwrite.
options.collectResourceTiming
boolean
default: false
If true , Resource Timing API information will be collected for requests made by GeoJSON and Vector Tile web workers (this information is normally inaccessible from the main Javascript thread). Information will be returned in a resourceTiming property of relevant data events.
options.fadeDuration
number
default: 300
Controls the duration of the fade-in/fade-out animation for label collisions after initial map load, in milliseconds. This setting affects all symbol layers. This setting does not affect the duration of runtime styling transitions or raster tile cross-fading.
options.crossSourceCollisions
boolean
default: true
If true , symbols from multiple sources can collide with each other during collision detection. If false , collision detection is run separately for the symbols in each source.
options.locale
Object
default: null
A patch to apply to the default localization table for UI strings, e.g. control tooltips. The locale object maps namespaced UI string IDs to translated strings in the target language; see src/ui/default_locale.js for an example with all supported string IDs. The object may specify all UI strings (thereby adding support for a new translation) or only a subset of strings (thereby patching the default translation table).
options.pixelRatio
number?		The pixel ratio. The canvas' width attribute will be container.clientWidth * pixelRatio and its height attribute will be container.clientHeight * pixelRatio . Defaults to devicePixelRatio if not specified.

Example

var map = new trackasiagl.Map({
container: 'map',
center: [-122.420679, 37.772537],
zoom: 13,
style: style_object,
hash: true,
transformRequest: (url, resourceType)=> {
if(resourceType === 'Source' && url.startsWith('http://myHost')) {
return {
url: url.replace('http', 'https'),
headers: { 'my-custom-header': true},
credentials: 'include'  // Include cookies for cross-origin requests
}
}
}
});

Instance Members

Events