Class: feature

Extends

• geo.sceneObject

Type Definitions

geo.feature.createSpecgeo.feature.spec

Properties:

Name	Type	Argument	Default	Description
type	string			A supported feature type.
data	Array.<object>	<optional>	[]	An array of arbitrary objects used to construct the feature. These objects (and their associated indices in the array) will be passed back to style and attribute accessors provided by the user.

geo.feature.eventgeo.event

Properties:

Name	Type	Argument	Description
index	number		The index of the feature within the data array.
data	object		The data element associated with the indexed feature.
mouse	geo.mouseState		The mouse information during the event.
extra	object	<optional>	Additional information about the feature. This is sometimes used to identify a subsection of the feature.
eventID	number	<optional>	A monotonically increasing number identifying this feature event loop. This is provided on geo.event.feature.mousemove, geo.event.feature.mouseclick, geo.event.feature.mouseover, geo.event.feature.mouseout, geo.event.feature.brush, and geo.event.feature.brushend events, since each of those can trigger multiple events for one mouse action (all events triggered by the same mouse action will have the same eventID).
top	boolean	<optional>	true if this is the top-most feature that the mouse is over. Only the top-most feature gets geo.event.feature.mouseon events, whereas multiple features can get other events.

geo.feature.searchResultobject

Properties:

Name	Type	Argument	Description
found	Array.<object>		A list of elements from the data array that were found by the search.
index	Array.<number>		A list of the indices of the elements that were found by the search.
extra	Array.<object>	<optional>	A list of additional information per found element. The information is passed to events without change.

geo.feature.specobject

General specification for features.

Properties:

Name	Type	Argument	Default	Description
layer	geo.layer	<optional>		the parent layer associated with the feature.
selectionAPI	boolean | 'auto'	<optional>	'auto'	If 'auto', enable selection events if any geo.event.feature events are bound to the feature. Otherwise, if truthy, enable selection events on the feature. Selection events are those in geo.event.feature. They can be bound via a call like feature.geoOn(geo.event.feature.mousemove, function (evt) { // do something with the feature }); where the handler is passed a geo.event.feature object.
visible	boolean	<optional>	true	If truthy, show the feature. If falsy, hide the feature and do not allow interaction with it.
gcs	string	<optional>		The interface gcs for this feature. If undefined or null, this uses the layer's interface gcs. This is a string used by geo.transform.
bin	number	<optional>	null	The bin number is used to determine the order of multiple features on the same layer. It has no effect except on the webgl renderer. A negative value hides the feature without stopping interaction with it. Otherwise, more features with higher bin numbers are drawn above those with lower bin numbers. If two features have the same bin number, their order relative to one another is indeterminate and may be unstable. A value of null will use the current position of the feature within its parent's list of children as the bin number.
renderer	geo.renderer	<optional>		A reference to the renderer used for the feature. If null or unset or identical to layer.renderer(), the layer's renderer is used.
style	geo.feature.styleSpec	<optional>		An object that contains style values for the feature.

geo.feature.styleSpecobject

Style specification for a feature.

Static Members

staticgeo.feature.eventIDnumber

The most recent geo.feature.event triggered.

Members

inherited idle

Getter for the idle state. Read only.

Properties:

Name	Type	Description
idle	boolean	true if the object is idle (onIdle would call a handler immediately).

ready

Properties:

Name	Type	Description
ready	boolean	true if this feature has been initialized, false if it was destroyed, undefined if it was created but not initialized.

Static Methods

staticgeo.feature.create(layer, spec){geo.feature|null}

feature.js, line 985

Create a feature. This defines a general interface; see individual feature types for specific details.

Name	Type	Description
layer	geo.layer	The layer to add the feature to.
spec	geo.feature.spec	The feature specification. At least the type must be specified.

Returns:

Type	Description
geo.feature | null	The created feature or null for a failure.

Methods

inherited addChild(child){this}

sceneObject.js, line 64

Add a child (or an array of children) to the object.

Name	Type	Description
child	geo.object | Array.<geo.object>	A child object or array of child objects.

Returns:

Type	Description
this

inherited addPromise(promise){this}

sceneObject.js, line 34

Add the promise here and also propagate up the scene tree.

Name	Type	Description
promise	Promise	A promise object.

Returns:

Type	Description
this

bin(val, actualValue){number|this}

feature.js, line 734

Get/Set bin of the feature. The bin number is used to determine the order of multiple features on the same layer. It has no effect except on the webgl renderer. A negative value hides the feature without stopping interaction with it. Otherwise, features with higher bin numbers are drawn above those with lower bin numbers. If two features have the same bin number, their order relative to one another is indeterminate and may be unstable.

Name	Type	Description
val	number	optional The new bin number. If undefined, return the current bin number. If null, the bin is dynamically computed based on order within the parent. If children are nested, this may not be what is desired.
actualValue	boolean	optional If truthy and val is undefined, return the actual value of bin, rather than the dynamically computed value.

Returns:

Type	Description
number | this	The current bin number or a reference to this.

boxSearch(lowerLeft, upperRight, opts){geo.feature.searchResult}

feature.js, line 207

Search for features contained within a rectangular region.

Name	Type	Description
lowerLeft	geo.geoPosition	Lower-left corner in gcs coordinates.
upperRight	geo.geoPosition	Upper-right corner in gcs coordinates.
opts	object	optional Additional search options. Name Type Default Description partial boolean false optional If truthy, include features that are partially in the box, otherwise only include features that are fully within the region.

Returns:

Type	Description
geo.feature.searchResult	An object with a list of features and feature indices that are located at the specified point.

buildTime(val){geo.timestamp|this}

feature.js, line 777

Get/Set timestamp of last time a build happened.

Name	Type	Description
val	geo.timestamp	optional The new build timestamp object or undefined to get the current build timestamp object.

Returns:

Type	Description
geo.timestamp | this

inherited children(){Array.<geo.object>}

sceneObject.js, line 95

Get an array of the child objects.

Returns:

Type	Description
Array.<geo.object>	A copy of the array of child objects.

data(data){array|this}

feature.js, line 814

Get/Set the data array for the feature. This is equivalent to getting or setting the data style, except that setting the data array via this method updates the data timestamp, whereas setting it via the style does not.

Name	Type	Description
data	array	optional A new data array or undefined to return the existing array.

Returns:

Type	Description
array | this

dataTime(val){geo.timestamp|this}

feature.js, line 760

Get/Set timestamp of data change.

Name	Type	Description
val	geo.timestamp	optional The new data timestamp object or undefined to get the current data timestamp object.

Returns:

Type	Description
geo.timestamp | this

dependentFeatures(arg){Array.<geo.feature>|this}

feature.js, line 709

Get/Set a list of dependent features. Dependent features have their visibility changed at the same time as the feature.

Name	Type	Description
arg	Array.<geo.feature>	optional If specified, the new list of dependent features. Otherwise, return the current list of dependent features.

Returns:

Type	Description
Array.<geo.feature> | this	The current list of dependent features or a reference to this.

inherited draw(arg){this}

sceneObject.js, line 106

Force redraw of a scene object, to be implemented by subclasses. Base class just calls draw of child objects.

Name	Type	Description
arg	object	Options to pass to the child draw functions.

Returns:

Type	Description
this

featureGcsToDisplay(c){geo.screenPosition}

feature.js, line 651

Convert from the feature's gcs coordinates to display coordinates.

Name	Type	Description
c	geo.geoPosition	The input coordinate to convert.

Returns:

Type	Description
geo.screenPosition	Display space coordinates.

gcs(val){string|this}

feature.js, line 632

Get/Set the projection of the feature.

Name	Type	Description
val	string	optional nullable If undefined, return the current gcs. If null, use the map's interface gcs. Otherwise, set a new value for the gcs.

Returns:

Type	Description
string | this	A string used by geo.transform. If the map interface gcs is in use, that value will be returned. If the gcs is set, return the current class instance.

inherited geoIsOn(event, handler){boolean}

object.js, line 134

Report if an event handler is bound to this object.

Name	Type	Description
event	string | Array.<string>	An event or list of events to check.
handler	function	optional A function that might be bound. If undefined, this will report true if there is any handler for the specified event.

Returns:

Type	Description
boolean	true if any of the specified events are bound to the specified handler.

geoOff(event, arg){this}

feature.js, line 942

Remove handlers from one event or an array of events. If no event is provided all handlers will be removed.

Name	Type	Description
event	string | Array.<string>	optional An event or a list of events from geo.event or defined by the user, or undefined to remove all events (in which case arg is ignored).
arg	function | Array.<function()>	optional nullable A function or array of functions to remove from the events or a falsy value to remove all handlers from the events.

Returns:

Type	Description
this

geoOn(event, handler){this}

feature.js, line 920

Bind an event handler to this object.

Name	Type	Description
event	string	An event from geo.event or a user-defined value.
handler	function	A function that is called when event is triggered. The function is passed a geo.event object.

Returns:

Type	Description
this

inherited geoTrigger(event, args, childrenOnly){this}

sceneObject.js, line 121

Trigger an event (or events) on this object and call all handlers.

Name	Type	Description
event	string	The event to trigger.
args	object	Arbitrary argument to pass to the handler.
childrenOnly	boolean	optional If truthy, only propagate down the tree.

Returns:

Type	Description
this

layer(){geo.layer}

feature.js, line 609

Get the layer referenced by the feature.

Returns:

Type	Description
geo.layer	The layer associated with the feature.

inherited modified(){this}

timestamp.js, line 25

Update the timestamp to the next global timestamp value.

Returns:

Type	Description
this

mouseOverOrderHighestIndex(evt)

feature.js, line 867

If the selectionAPI is on, then setting this.geoOn(geo.event.feature.mouseover_order, this.mouseOverOrderHighestIndex) will make it so that the mouseon events prefer the highest index feature.

Name	Type	Description
evt	geo.event	The event; this should be triggered from geo.event.feature.mouseover_order.

inherited onIdle(handler){this}

object.js, line 33

Bind a handler that will be called one time when all internal promises are resolved. If there are no outstanding promises, this is invoked synchronously.

Name	Type	Description
handler	function	A function taking no arguments.

Returns:

Type	Description
this

inherited parent(arg){this|geo.sceneObject}

sceneObject.js, line 49

Get/set parent of the object.

Name	Type	Description
arg	geo.sceneObject	optional The new parant or undefined to get the current parent.

Returns:

Type	Description
this | geo.sceneObject

pointSearch(geo){geo.feature.searchResult}

feature.js, line 187

Search for features containing the given point. This should be defined in relevant subclasses.

Name	Type	Description
geo	geo.geoPosition	Coordinate in interface gcs.

Returns:

Type	Description
geo.feature.searchResult	An object with a list of features and feature indices that are located at the specified point.

polygonSearch(poly, opts){geo.feature.searchResult}

feature.js, line 227

Search for features contained within a polygon. This should be defined in relevant subclasses.

Name	Type	Description
poly	geo.polygonObject	A polygon as an array of coordinates or an object with outer and optionally inner parameters. All coordinates are in map interface gcs.
opts	object	optional Additional search options. Name Type Default Description partial boolean false optional If truthy, include features that are partially in the polygon, otherwise only include features that are fully within the region.

Returns:

Type	Description
geo.feature.searchResult	An object with a list of features and feature indices that are located at the specified point.

inherited removeChild(child){this}

sceneObject.js, line 81

Remove a child (or array of children) from the object.

Name	Type	Description
child	geo.object | Array.<geo.object>	A child object or array of child objects.

Returns:

Type	Description
this

renderer(){geo.renderer}

feature.js, line 618

Get the renderer used by the feature.

Returns:

Type	Description
geo.renderer	The renderer used to render the feature.

selectionAPI(arg, direct){boolean|string|this}

feature.js, line 838

Get/Set if the selection API is enabled for this feature.

Name	Type	Description
arg	boolean | string	optional undefined to return the selectionAPI state, a boolean to change the state, or 'auto' to set the state based on the existence of event handlers. When getting the state, if direct is not specified, 'auto' is never returned.
direct	boolean	optional If true, when getting the selectionAPI state, disregard the state of the parent layer, and when setting, refresh the state regardless of whether it has changed or not.

Returns:

Type	Description
boolean | string | this	Either the selectionAPI state or the feature instance.

style(arg1, arg2){object|this}

feature.js, line 485

Get/Set style used by the feature. Styles can be constant values or functions. If a function, the style is typically called with parameters such as (dataElement, dataIndex) or, if the specific style of a feature has a subfeature style, with (subfeatureElement, subfeatureIndex, dataElement, dataIndex).

See the style specification styleSpec for available styles.

Name	Type	Description
arg1	string | object	optional If undefined, return the current style object. If a string and arg2 is undefined, return the style associated with the specified key. If a string and arg2 is defined, set the named style to the specified value. Otherwise, extend the current style with the values in the specified object.
arg2	*	optional If arg1 is a string, the new value for that style.

Returns:

Type	Description
object | this	Either the entire style object, the value of a specific style, or the current class instance.

style.get(key){function|object}

feature.js, line 501

A uniform getter that always returns a function even for constant styles. This can also return all defined styles as functions in a single object.

If the style key is a color, the returned function will also coerce the result to be a geo.geoColorObject.

Name	Type	Description
key	string	optional If defined, return a function for the named style. Otherwise, return an object with a function for all defined styles.

Returns:

Type	Description
function | object	Either a function for the named style or an object with functions for all defined styles.

inherited timestamp(){number}

timestamp.js, line 37

Get time.

Returns:

Type	Description
number	The timestamp. This is 0 if the timestamp has never been modified.

updateStyleFromArray(keyOrObject, styleArray, refresh){this}

feature.js, line 564

Set style(s) from array(s). For each style, the array should have one value per data item. The values are not converted or validated. Color values should be geo.geoColorObjects. If invalid values are given the behavior is undefined. For some feature styles, if the first entry of an array is itself an array, then each entry of the array is expected to be an array, and values are used from these subarrays. This allows a style to apply, for instance, per vertex of a data item rather than per data item.

Name	Type	Default	Description
keyOrObject	string | object		Either the name of a single style or an object where the keys are the names of styles and the values are each arrays.
styleArray	array		If keyOrObject is a string, an array of values for the style. If keyOrObject is an object, this parameter is ignored.
refresh	boolean	false	optional true to redraw the feature when it has been updated. If an object with styles is passed, the redraw is only done once.

Returns:

Type	Description
this	The feature instance.

updateTime(val){geo.timestamp|this}

feature.js, line 794

Get/Set timestamp of last time an update happened.

Name	Type	Description
val	geo.timestamp	optional The new update timestamp object or undefined to get the current update timestamp object.

Returns:

Type	Description
geo.timestamp | this

visible(val, direct){boolean|this}

feature.js, line 674

Get/Set the visibility of the feature.

Name	Type	Description
val	boolean	optional A boolean to change the visibility, or undefined to return the visibility.
direct	boolean	optional If true, when getting the visibility, disregard the visibility of the parent layer, and when setting, refresh the state regardless of whether it has changed or not. Otherwise, the functional visibility is returned, where both the feature and the layer must be visible for a true result.

Returns:

Type	Description
boolean | this	Either the visibility (if getting) or the feature (if setting).