Class: contourFeature

Extends

• geo.meshFeature

Type Definitions

geo.contourFeature.contourInfogeo.meshFeature.meshColoredInfo

Computed contour information.

Properties:

Name	Type	Description
value	Array.<number>	An array of values that have been normalized to a range of [0, steps]. There is one value per vertex or element.
opacity	Array.<number>	An array of opacities per vertex or element.
minValue	number	the minimum value used for the contour. If rangeValues was specified, this is the first entry of that array.
maxValue	number	the maximum value used for the contour. If rangeValues was specified, this is the last entry of that array.
factor	number	If linear value scaling is used, this is the number of color values divided by the difference between the maximum and minimum values. It is ignored if non-linear value scaling is used.
minColor	geo.geoColorObject	The color used for values below minValue. Includes opacity.
maxColor	geo.geoColorObject	The color used for values above maxValue. Includes opacity.
colorMap	Array.<geo.geoColorObject>	The specified colorRange and opacityRange converted into objects that include opacity.
elementValues	boolean	Truthy if the value and opacity are for elements, falsy for vertices.
shape	string	One of 'triangle' or 'square'. If square, each pair of elements is one square. These elements have vertices v00, v01, v02, v10, v11, v12. The square is formed via v00-v01-v10-v11-v00. For triangle, each element stands alone.
elements	Array.<number>	A packed array of indices into the pos array defining the elements. Each sequential three values forms a triangle.
elementIndex	Array.<number>	An array that has one value for each triplet of values in the elements array. The value is the 0-based index of the element that can be used to correspond it to element-based parameters.
index	Array.<number>	An array that references which data index is associated with each vertex.
pos	Array.<number>	A packed array of coordinates in the interface gcs for the vertices. This is in the order x0, y0, z0, x1, y1, z2, x2, ...
numberVertices	number	the number of vertices in the mesh.
numberElementsthe	number	number of elements (squares or triangles) in the mesh.
verticesPerElement	number	3 for triangles, 6 for squares.

geo.contourFeature.contourSpecgeo.meshFeature.meshSpec

Contour specification. All of these properties can be functions, which get passed the geo.meshFeature.meshInfo object.

Properties:

Name	Type	Argument	Default	Description
min	number	<optional>		Minimum contour value. If unspecified, taken from the computed minimum of the value style.
max	number	<optional>		Maximum contour value. If unspecified, taken from the computed maximum of the value style.
minColor	geo.geoColor	<optional>	'black'	Color used for any value below the minimum.
minOpacity	number	<optional>	0	Opacity used for any value below the minimum.
maxColor	geo.geoColor	<optional>	'black'	Color used for any value above the maximum.
maxOpacity	number	<optional>	0	Opacity used for any value above the maximum.
stepped	boolean	<optional>		If falsy but not undefined, smooth transitions between colors.
colorRange	Array.<geo.geoColor>	<optional>	<color table>	An array of colors used to show the range of values. The default is a 9-step color table.
opacityRange	Array.<number>	<optional>		An array of opacities used to show the range of values. If unspecified, the opacity is 1. If this is a shorter list than the colorRange, an opacity of 1 is used for the entries near the end of the color range.
rangeValues	Array.<number>	<optional>		An array used to map values to the colorRange. By default, values are spaced linearly. If specified, the entries must be increasing weakly monotonic, and there must be one more entry then the length of colorRange if the contour is stepped, or the same length as the colorRange if unstepped.
elements	Array.<number> | Array.<Array.<number>>	<optional>		If specified, a list of indices into the data array that form elements. If this is an array of arrays, each subarray must have at least either 3 values for triangular elements or 4 values for square elements. If this is a single array, the data indices are of all elements are packed one after another and the elementPacking property is used to determine element shape. If this null or undefined, a rectangular grid of squares is used based on gridWidth and gridHeight or an implicit version of those parameters.
elementPacking	string	<optional>	'auto'	If elements is provided as a single array, this determines the shape of the elements. It is one of auto, triangle, or square. triangle uses triplets of values to define elements. square uses quads of values. auto is identical to triangle unless elements's length is a multiple of 4 and not a multiple of 3, in which case it is the same as square.
gridWidth	number	<optional>		The number of data columns in the grid. If this is not specified and gridHeight is given, this is the number of data elements divided by gridHeight. If neither gridWidth nor gridHeight are specified, the squareroot of the number of data elements is used. If both are specified, some data could be unused. Ignored if elements is used.
gridHeight	number	<optional>		The number of data rows in the grid. If this is not specified and gridWidth is given, this is the number of data elements divided by gridWidth. If neither gridWidth not gridHeight are specified, the squareroot of the number of data elements is used. If both are specified, some data could be unused. Ignored if elements is used.
x0	number	<optional>		The x coordinate of the 0th data point. If null or undefined, the coordinate is taken from the position style. Ignored if elements is used.
y0	number	<optional>		The y coordinate of the 0th data point. If null or undefined, the coordinate is taken from the position style. Ignored if elements is used.
dx	number	<optional>		The distance in the x direction between the 0th and 1st data point. This may be positive or negative. If 0, null, or undefined, the coordinate is taken from the position style. Ignored if elements is used.
dy	number	<optional>		The distance in the y direction between the 0th and gridWidthth data point. This may be positive or negative. If 0, null, or undefined, the coordinate is taken from the position style. Ignored if elements is used.
wrapLongitude	boolean	<optional>	true	If truthy and position is not used (elements is not used and x0, y0, dx, and dy are all set appropriately), assume the x coordinates are longitude and should be adjusted to be within -180 to 180. If the data spans 180 degrees, the points or squares that straddle the meridian will be duplicated to ensure that the map is covered from -180 to 180 as appropriate. Set this to false if using a non-longitude x coordinate.

geo.contourFeature.specgeo.feature.spec

Contour feature specification.

Properties:

Name	Type	Argument	Default	Description
data	Array.<object>	<optional>	[]	An array of arbitrary objects used to construct the feature.
style	geo.contourFeature.styleSpec	<optional>		An object that contains style values for the feature.
contour	geo.contourFeature.contourSpec	<optional>		The contour specification for the feature.
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.

geo.contourFeature.styleSpecgeo.feature.styleSpec

Style specification for a contour feature.

Properties:

Name	Type	Argument	Default	Description
position	geo.geoPosition | function	<optional>	data	The position of each data element. This defaults to just using x, y, and z properties of the data element itself. The position is in the feature's gcs coordinates.
value	number | function	<optional>	data.z	The value of each data element. This defaults to the z property of the data elements. If the value of a grid point is null or undefined, the point and elements that use that point won't be included in the results.
opacity	number | function	<optional>	1	The opacity for the whole feature on a scale of 0 to 1.
origin	Array.<number> | function	<optional>		Origin in map gcs coordinates used for to ensure high precision drawing in this location. When called as a function, this is passed the vertex positions as a single continuous array in map gcs coordinates. It defaults to the first vertex used in the contour.

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).

inherited 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.

Methods

inherited addChild(child){this}

sceneObject.js, line 79

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 35

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

Name	Type	Description
promise	Promise	A promise object.

Returns:

Type	Description
this

inherited bin(val, actualValue){number|this}

feature.js, line 740

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.

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

feature.js, line 212

Search for features contained within a rectangular region.

Name	Type	Description
lowerLeft	geo.geoPosition	Lower-left corner.
upperRight	geo.geoPosition	Upper-right corner.
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.
gcs	string | geo.transform | null	optional Input gcs. undefined to use the interface gcs, null to use the map gcs, or any other transform.

Returns:

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

inherited buildTime(val){geo.timestamp|this}

feature.js, line 783

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 110

Get an array of the child objects.

Returns:

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

inherited contour(specOrProperty, value){geo.meshFeature.meshSpec|object|this}

meshFeature.js, line 140

Get/Set mesh accessor.

Name	Type	Description
specOrProperty	string | geo.meshFeature.meshSpec	optional If undefined, return the current mesh specification. If a string is specified, either get or set the named mesh property. If an object is given, set or update the specification with the specified parameters.
value	object	optional If specOrProperty is a string, set that property to value. If undefined, return the current value of the named property.

Returns:

Type	Description
geo.meshFeature.meshSpec | object | this	The current mesh specification, the value of a named mesh property, or this mesh object.

inherited data(data){array|this}

feature.js, line 820

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

inherited dataTime(val){geo.timestamp|this}

feature.js, line 766

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

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

feature.js, line 715

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 121

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

inherited featureGcsToDisplay(c){geo.screenPosition}

feature.js, line 657

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.

inherited gcs(val){string|this}

feature.js, line 638

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 187

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.

inherited geoOff(event, arg){this}

feature.js, line 948

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

inherited geoOn(event, handler){this}

feature.js, line 926

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 geoOnce(event, handler){function}

object.js, line 168

Bind an event handler to this object that will fire once and then deregister itself.

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
function	The actual bound handler. This is a wrapper around the handler that was passed to the function.

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

sceneObject.js, line 136

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

inherited layer(){geo.layer}

feature.js, line 615

Get the layer referenced by the feature.

Returns:

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

inherited mesh(specOrProperty, value){geo.meshFeature.meshSpec|object|this}

meshFeature.js, line 140

Get/Set mesh accessor.

Name	Type	Description
specOrProperty	string | geo.meshFeature.meshSpec	optional If undefined, return the current mesh specification. If a string is specified, either get or set the named mesh property. If an object is given, set or update the specification with the specified parameters.
value	object	optional If specOrProperty is a string, set that property to value. If undefined, return the current value of the named property.

Returns:

Type	Description
geo.meshFeature.meshSpec | object | this	The current mesh specification, the value of a named mesh property, or this mesh object.

inherited mesh.get(key){object|function}

meshFeature.js, line 175

A uniform getter that always returns a function even for constant values. If undefined input, return all the mesh values as an object.

Name	Type	Description
key	string | undefined	The name of the mesh key or undefined to return an object with all keys as functions.

Returns:

Type	Description
object | function	A function related to the key, or an object with all mesh keys, each of which is a function.

inherited modified(){this}

timestamp.js, line 25

Update the timestamp to the next global timestamp value.

Returns:

Type	Description
this

inherited mouseOverOrderHighestIndex(evt)

feature.js, line 873

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 36

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 64

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

inherited pointSearch(geo, gcs){geo.feature.searchResult}

feature.js, line 190

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

Name	Type	Description
geo	geo.geoPosition	Coordinate.
gcs	string | geo.transform | null	optional Input gcs. undefined to use the interface gcs, null to use the map gcs, or any other transform.

Returns:

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

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

feature.js, line 233

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.
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.
gcs	string | geo.transform | null	optional Input gcs. undefined to use the interface gcs, null to use the map gcs, or any other transform.

Returns:

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

inherited position(val){array|function|this}

meshFeature.js, line 208

Get/Set position accessor. This is identical to getting or setting the position style.

Name	Type	Description
val	array | function	optional If specified, set the position style. If undefined, return the current value.

Returns:

Type	Description
array | function | this	Either the position style or this.

inherited removeChild(child){this}

sceneObject.js, line 96

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

inherited removePromise(promise){this}

sceneObject.js, line 49

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

Name	Type	Description
promise	Promise	A promise object.

Returns:

Type	Description
this

inherited renderer(){geo.renderer}

feature.js, line 624

Get the renderer used by the feature.

Returns:

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

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

feature.js, line 844

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.

inherited style(arg1, arg2){object|this}

feature.js, line 491

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.

inherited style.get(key){function|object}

feature.js, line 507

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.

inherited updateStyleFromArray(keyOrObject, styleArray, refresh){this}

feature.js, line 570

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.

inherited updateTime(val){geo.timestamp|this}

feature.js, line 800

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

inherited visible(val, direct){boolean|this}

feature.js, line 680

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).