Class: map

Extends

• geo.sceneObject

Type Definitions

geo.map.createSpecgeo.map.spec

Specification used with map.create.

Properties:

Name	Type	Argument	Default	Description
data	Array.<object>	<optional>	[]	The default data array to apply to each feature if none exists.
layers	Array.<geo.layer.spec>	<optional>	[]	Layers to create.

geo.map.specobject

Map specification.

Properties:

Name	Type	Argument	Default	Description
node	string			DOM selector for the map container.
gcs	string | geo.transform	<optional>	'EPSG:3857'	The main coordinate system of the map (this is often web Mercator).
ingcs	string | geo.transform	<optional>	'EPSG:4326'	The default coordinate system of interface calls (this is often latitude and longitude).
unitsPerPixel	number	<optional>	156543	GCS to pixel unit scaling at zoom 0 (i.e., meters per pixel or degrees per pixel). The actual default is maxBounds.right - maxBounds.left converted to gcs and then divided by 256.
maxBounds	object	<optional>		The maximum visible map bounds. Properties Name Type Argument Default Description left number <optional> -180 The left bound. right number <optional> 180 The right bound. bottom number <optional> -85.06 The bottom bound. The default is actually the left value transformed to the map's gcs coordinate system. top number <optional> 85.06 The top bound. The default is actually the right value transformed to the map's gcs coordinate system. gcs number <optional> ingcs The coordinate system for the bounds.
zoom	number	<optional>	4	Initial zoom.
center	object	<optional>		Initial map center. Properties Name Type Default Description x number 0 y number 0
rotation	number	<optional>	0	Initial clockwise rotation in radians.
width	number	<optional>		The map width (default node width).
height	number	<optional>		The map height (default node height).
min	number	<optional>	0	Minimum zoom level (though fitting to the viewport may make it so this is smaller than the smallest possible value).
max	number	<optional>	16	Maximum zoom level.
discreteZoom	boolean	<optional>	false	If true, only allow integer zoom levels. false for any zoom level.
allowRotation	boolean | function	<optional>	true	false prevents rotation, true allows any rotation. If a function, the function is called with a rotation (angle in radians) and returns a valid rotation. This can be used to constrain the rotation to a range or specific values.
camera	geo.camera	<optional>		The camera to control the view.
interactor	geo.mapInteractor	<optional>		The UI event handler. If undefined, a default interactor is created and used. If null, no interactor is attached to the map.
animationQueue	array	<optional>		An array used to synchronize animations. If specified, this should be an empty array or the same array as passed to other map instances.
autoResize	boolean	<optional>	true	Adjust map size on window resize.
clampBoundsX	boolean	<optional>	false	Prevent panning outside of the maximum bounds in the horizontal direction.
clampBoundsY	boolean	<optional>	true	Prevent panning outside of the maximum bounds in the vertical direction.
clampZoom	boolean	<optional>	true	Prevent zooming out so that the map area is smaller than the window.

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).

Static Methods

staticgeo.map.create(spec){geo.map|null}

map.js, line 2344

Create a map from an object. Any errors in the creation of the map will result in returning null.

Name	Type	Description
spec	geo.map.createSpec	The map creation specification.

Returns:

Type	Description
geo.map | null

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

allowRotation(allowRotation){boolean|function|this}

map.js, line 310

Get/set the allowRotation setting. If changed, adjust the map as needed.

Name	Type	Description
allowRotation	boolean | function	optional The new allowRotation value. false prevents rotation, true allows any rotation. If a function, the function is called with a rotation (angle in radians) and returns a valid rotation (this can be used to constrain the rotation to a range or to specific values).

Returns:

Type	Description
boolean | function | this

animationQueue(queue){array|this}

map.js, line 200

Get/set the animation queue. Two maps can share a single animation queue to ensure synchronized animations. When setting, the animation queue will merge values from the existing queue into the new queue.

Name	Type	Description
queue	array	optional The animation queue to use.

Returns:

Type	Description
array | this	The current animation queue or the current map.

autoResize(autoResize){boolean|this}

map.js, line 230

Get/set the autoResize flag.

Name	Type	Description
autoResize	boolean	optional Truthy to automaticaly resize the map when the size of the browser window changes.

Returns:

Type	Description
boolean | this	The current state of autoResize or the current map.

bounds(bds, gcs){geo.geoBounds}

map.js, line 1304

Get/set the locations of the current map edges. When set, the left-top and right-bottom corners are transformed to the map's gcs and then used to set the bounds.

Name	Type	Description
bds	geo.geoBounds	optional The requested map bounds.
gcs	string | geo.transform | null	optional undefined to use the interface gcs, null to use the map gcs, or any other transform. If setting the bounds, they are converted from this gcs to the map projection. The returned bounds are converted from the map projection to this gcs.

Returns:

Type	Description
geo.geoBounds	The actual new map bounds.

boundsFromZoomAndCenter(zoom, center, rotation, gcs, ignoreDiscreteZoom, ignoreClampBounds){geo.geoBounds}

map.js, line 1451

Get the bounds that will be displayed with the given zoom and center.

Note: the bounds may not have the requested zoom and center due to map restrictions.

Name	Type	Description
zoom	number	The requested zoom level.
center	geo.geoPosition	The requested center.
rotation	number	The requested rotation in clockwise radians.
gcs	string | geo.transform | null	optional undefined to use the interface gcs, null to use the map gcs, or any other transform.
ignoreDiscreteZoom	boolean	If true, ignore the discreteZoom option when determining the new view.
ignoreClampBounds	boolean	optional If true and clampBoundsX or clampBoundsY is set, allow the bounds to be less clamped. The map's maxBounds can be shifted so that they lie no further than the center of the bounds (rather than being forced to be at the edge).

Returns:

Type	Description
geo.geoBounds

camera(){geo.camera}

map.js, line 338

Get the camera.

Returns:

Type	Description
geo.camera

center(coordinates, gcs, ignoreDiscreteZoom, ignoreClampBounds){geo.geoPosition|this}

map.js, line 586

Set center of the map to the given geographic coordinates, or get the current center. Uses bare objects {x: 0, y: 0}.

Name	Type	Description
coordinates	geo.geoPosition	If specified, the new center of the map.
gcs	string | geo.transform | null	optional undefined to use the interface gcs, null to use the map gcs, or any other transform. If setting the center, it is converted from this gcs to the map projection. The returned center is converted from the map projection to this gcs.
ignoreDiscreteZoom	boolean	optional If true, ignore the discreteZoom option when determining the new view.
ignoreClampBounds	boolean | 'limited'	optional If true ignore the clampBoundsX and clampBoundsY options when determining the new view. When 'limited', the clampBoundsX and clampBoundsY options are selectively enforced so that the map will not end up more out of bounds than its current state.

Fires:

• geo.event.pan

Returns:

Type	Description
geo.geoPosition | 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.

clampBoundsX(clamp){boolean|this}

map.js, line 251

Get/set the clampBoundsX setting. If changed, adjust the bounds of the map as needed.

Name	Type	Description
clamp	boolean	optional The new clamp value.

Returns:

Type	Description
boolean | this

clampBoundsY(clamp){boolean|this}

map.js, line 269

Get/set the clampBoundsY setting. If changed, adjust the bounds of the map as needed.

Name	Type	Description
clamp	boolean	optional The new clamp value.

Returns:

Type	Description
boolean | this

clampZoom(clamp){boolean|this}

map.js, line 287

Get/set the clampZoom setting. If changed, adjust the bounds of the map as needed.

Name	Type	Description
clamp	boolean	optional The new clamp value.

Returns:

Type	Description
boolean | this

createLayer(layerName, arg){geo.layer}

map.js, line 615

Add a layer to the map.

Name	Type	Description
layerName	string	The type of layer to add to the map.
arg	object	Parameters for the new layer.

Fires:

• geo.event.layerAdd

Returns:

Type	Description
geo.layer

deleteLayer(layer){geo.layer}

map.js, line 646

Remove a layer from the map.

Name	Type	Description
layer	geo.layer	nullable Layer to remove from the map.

Fires:

• geo.event.layerRemove

Returns:

Type	Description
geo.layer

discreteZoom(discreteZoom){boolean|this}

map.js, line 1510

Get/set the discrete zoom flag. If true, the map will snap to integer zoom levels.

Name	Type	Description
discreteZoom	boolean	optional If specified, the new discrete zoom flag.

Returns:

Type	Description
boolean | this	The current discrete zoom flag or the map object.

displayToGcs(c, gcs){geo.geoPosition|Array.<geoPosition>}

map.js, line 827

Convert from display to gcs coordinates. This is identical to calling displayToWorld and then worldToGcs.

Name	Type	Description
c	geo.screenPosition | Array.<geo.screenPosition>	The input display coordinate to convert.
gcs	string | geo.transform | null	optional Output gcs. undefined to use the interface gcs, null to use the map gcs, or any other transform.

Returns:

Type	Description
geo.geoPosition | Array.<geoPosition>	GCS space coordinates.

displayToWorld(c){geo.worldPosition|Array.<geo.worldPosition>}

map.js, line 840

Convert from display coordinates to world coordinates using the attached camera.

Name	Type	Description
c	geo.screenPosition | Array.<geo.screenPosition>	The input coordinate to convert.

Returns:

Type	Description
geo.worldPosition | Array.<geo.worldPosition>	World space coordinates.

draw(){this}

map.js, line 854

Redraw the map and all its layers.

Fires:

• geo.event.draw
• geo.event.drawEnd

Returns:

Type	Description
this	The map object.

exit()

map.js, line 942

Exit this map. This removes all layers, destroys current interactor, and empties the associated DOM node.

fileReader(readerOrName, opts){geo.fileReader|this}

map.js, line 886

Get, set, or create and set a file reader to a layer in the map to be used as a drop target.

Name	Type	Description
readerOrName	string | object	optional undefined to get the current reader, an instance of a file reader to set the reader, or a name to create a file reader.
opts	object	optional options Parameters for creating a file reader when the reader is specified by name. If this includes layer, use that layer, otherwise create a layer using these options.

Returns:

Type	Description
geo.fileReader | this

gcs(arg){string|this}

map.js, line 350

Get or set the map gcs. This is the coordinate system used in drawing the map.

Name	Type	Description
arg	string	optional If undefined, return the current gcs. Otherwise, a new value for the gcs.

Returns:

Type	Description
string | this	A string used by geo.transform.

gcsToDisplay(c, gcs){geo.screenPosition|Array.<geo.screenPosition>}

map.js, line 796

Convert from gcs coordinates to display coordinates. This is identical to calling gcsToWorld and then worldToDisplay.

Name	Type	Description
c	geo.geoPosition | Array.<geo.geoPosition>	The input coordinate to convert.
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.screenPosition | Array.<geo.screenPosition>	Display space coordinates.

gcsToWorld(c, gcs){geo.worldPosition|Array.<geo.worldPosition>}

map.js, line 738

Convert from gcs coordinates to map world coordinates.

Name	Type	Description
c	geo.geoPosition | Array.<geo.geoPosition>	The input coordinate to convert.
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.worldPosition | Array.<geo.worldPosition>	World space coordinates.

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.

inherited geoOff(event, arg){this}

object.js, line 193

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}

object.js, line 106

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

ingcs(arg){string|this}

map.js, line 375

Get or set the map interface gcs. This is the coordinate system used when getting or setting map bounds, center, and other values.

Name	Type	Description
arg	string	optional If undefined, returtn the current interface gcs. Otherwise, a new value for the interface gcs.

Returns:

Type	Description
string | this	A string used by geo.transform.

interactor(arg){geo.mapInteractor|this}

map.js, line 969

Get or set the map interactor.

Name	Type	Description
arg	geo.mapInteractor	optional If specified, the map interactor to set.

Returns:

Type	Description
geo.mapInteractor | this	The current map interactor or the map object.

layers()

map.js, line 1532

Get the layers contained in the map. Alias of geo.sceneObject#children.

listSceneObjects(objects){Array.<geo.sceneObject>}

map.js, line 1584

Get a sorted list of geo.sceneObject including all children. The list always includes specified objects. Children immediately follow their parents. Siblings may be separated by children of preceding siblings.

Name	Type	Description
objects	Array.<geo.sceneObject>	optional A list of objects for which the a combined list of dependents is generated. If not specified, the sorted list of layers is used.

Returns:

Type	Description
Array.<geo.sceneObject>	A list of object and dependents.

maxBounds(bounds, gcs){geo.geoBounds|this}

map.js, line 1343

Get/set the maximum view area of the map. If the map wraps, this is the unwrapped area.

Name	Type	Description
bounds	geo.geoBounds	optional The map bounds.
gcs	string | geo.transform | null	optional undefined to use the interface gcs, null to use the map gcs, or any other transform. If setting the bounds, they are converted from this gcs to the map projection. The returned bounds are converted from the map projection to this gcs.

Returns:

Type	Description
geo.geoBounds | this	The map maximum bounds or the map object.

inherited modified(){this}

timestamp.js, line 25

Update the timestamp to the next global timestamp value.

Returns:

Type	Description
this

node(){object}

map.js, line 388

Get root DOM node of the map.

Returns:

Type	Description
object

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

origin(){geo.geoPosition}

map.js, line 329

Get the map's world coordinate origin in gcs coordinates.

Returns:

Type	Description
geo.geoPosition

pan(delta, ignoreDiscreteZoom, ignoreClampBounds){this}

map.js, line 465

Pan the map by a number of display pixels.

Name	Type	Description
delta	object	Amount to pan in display pixels. Name Type Description x number Horizontal distance on the display. y number Vertical distance on the display.
ignoreDiscreteZoom	boolean	optional If true, ignore the discreteZoom option when determining the new view.
ignoreClampBounds	boolean | 'limited'	optional If true ignore the clampBoundsX and clampBoundsY options when determining the new view. When 'limited', the clampBoundsX and clampBoundsY options are selectively enforced so that the map will not end up more out of bounds than its current state.

Fires:

• geo.event.pan

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

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

rotatedSize(){geo.screenSize}

map.js, line 714

Get the rotated size of the map. This is the width and height of the non-rotated area necessary to enclose the rotated area in pixels.

Returns:

Type	Description
geo.screenSize	The size that fits the rotated map.

rotation(rotation, origin, ignoreRotationFunc){number|this}

map.js, line 528

Get/set the map rotation. The rotation is performed around the current view center. Rotation mostly ignores clampBoundsX, as the behavior feels peculiar otherwise.

Name	Type	Description
rotation	number	Absolute angle in radians (positive is clockwise).
origin	object	optional If specified, rotate about this origin. Name Type Description geo geo.geoPosition The gcs coordinates of the rotation center. map geo.screenPosition The display coordinates of the rotation center.
ignoreRotationFunc	boolean	optional If true, don't constrain the rotation.

Fires:

• geo.event.rotate
• geo.event.pan

Returns:

Type	Description
number | this

scheduleAnimationFrame(callback, action){number}

map.js, line 1827

Instead of each function using window.requestAnimationFrame, schedule all such frames through this function. This allows the callbacks to be reordered or removed as needed and reduces overhead in Chrome a small amount. Also, if the animation queue is shared between map instances, the callbacks will be called in a single time slice, providing better synchronization.

Name	Type	Default	Description
callback	function		Function to call during the animation frame. It is called with an animation epoch, exactly as requestAnimationFrame.
action	boolean | 'remove'	false	optional Falsy to only add the callback if it is not already scheduled. 'remove' to remove the callback (use this instead of cancelAnimationFrame). Any other truthy value moves the callback to the end of the list.

Returns:

Type	Description
number	An integer as returned by window.requestAnimationFrame.

screenshot(layers, type, encoderOptions, opts){deferred}

map.js, line 1681

Get a screen-shot of all or some of the canvas layers of map. Note that webGL layers are rerendered, even if window.overrideContextAttributes.preserveDrawingBuffer = true; is set before creating the map object. Chrome, at least, may not keep the drawing buffers if the tab loses focus (and returning focus won't necessarily rerender).

Name	Type	Default	Description
layers	geo.layer | Array.<geo.layer> | false | object		optional Either a layer, a list of layers, falsy to get all layers, or an object that contains optional values of layers, type, encoderOptions, and additional values listed in the opts parameter (this last form allows a single argument for the function).
type	string	'image/png'	optional See canvas.toDataURL. Use 'canvas' to return the canvas element (this can be used to get the results as a blob, which can be faster for some operations but is not supported as widely).
encoderOptions	number		optional See canvas.toDataURL.
opts	object		optional Additional screenshot options. Name Type Default Description background false | string | CanvasRenderingContext2D.fillStyle 'white' optional If false or null, don't prefill the background. Otherwise, a css color or CanvasRenderingContext2D.fillStyle to fill the initial canvas. This could match the background of the browser page, for instance. wait boolean | 'idle' false optional If 'idle', wait for the map to be idle and one additional animation frame to occur. If truthy, wait for an animation frame to occur. Otherwise, take the screenshot as soon as possible. attribution boolean | null null optional If null or unspecified, include the attribution only if all layers are used. If false, never include the attribution. If true, always include it.

Fires:

• geo.event.screenshot.ready

Returns:

Type	Description
deferred	A jQuery Deferred object. The done function receives either a data URL or an HTMLCanvasElement with the result.

size(arg){geo.screenSize|this}

map.js, line 673

Get or set the size of the map.

Name	Type	Description
arg	geo.screenSize	optional Size in pixels.

Fires:

• geo.event.resize

Returns:

Type	Description
geo.screenSize | this	The size in pixels or the map object.

sortedLayers(){Array.<geo.layer>}

map.js, line 1570

Get the layers contained in the map sorted by zIndex. If two layers have the same zIndex, they are returned in creation order.

Returns:

Type	Description
Array.<geo.layer>

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.

transition(opts, gcs, animTime){geo.map}

map.js, line 1063

Get the current transition or start an animated zoom/pan/rotate. If a second transition is requested while a transition is already in progress, a new transition is created that is functionally from wherever the map has moved to (possibly partway through the first transition) going to the end point of the new transition.

Name	Type	Description
opts	object	optional Options for a transition, or undefined to get the current transition. Name Type Default Description center geo.geoPosition optional A new map center. zoom number optional A new map zoom level. zoomOrigin geo.geoPosition optional An origin to use when zooming to a new zoom level. rotation number optional A new map rotation. duration number 1000 optional Transition duration in milliseconds. ease function optional Easing function for the transition. This is in the style of a d3 easing function. interp function optional Function to use when interpolating between values. This gets passed two arrays, the start and end values for [x, y, z or zoom, rotation], and returns a function that, when passed a time value returns an array of the interpolated [x, y, z or zoom, rotation] values. zCoord boolean optional If true, convert zoom values to z values for interpolation. done function optional If specified, call this function when a transition completes. The function is called with an object that contains cancel: a boolean if the transition was canceled, source: a value based on what canceled a transition, transition: the current transition that just completed, next: a boolean if another transition follows immediately.
gcs	string | geo.transform | null	optional Input gcs. undefined to use the interface gcs, null to use the map gcs, or any other transform. Applies only to opts.center and to converting zoom values to height, if specified.
animTime	number	optional The animation frame time (from a window.requestAnimationFrame callback). Used if a new transition is requested because the current transition has completed to keep things synchronized.

Fires:

• geo.event.transitionstart
• geo.event.transitionend
• geo.event.transitioncancel

Returns:

Type	Description
geo.map

transitionCancel(source){boolean}

map.js, line 1282

Cancel any existing transition. The transition will send a cancel event at the next animation frame, but no further activity occurs.

Name	Type	Description
source	string	optional Optional cause of the cancel. This can be any value, but something like (method name).(action) is recommended to allow other functions to determine the source and cause of the transition being canceled.

Fires:

• geo.event.transitioncancel

Returns:

Type	Description
boolean	true if a transition was in progress.

unitsPerPixel(zoom, unit){number|this}

map.js, line 179

Get/set the number of world space units per display pixel at the given zoom level.

Name	Type	Default	Description
zoom	number	0	optional The target zoom level.
unit	number		optional nullable If present, set the unitsPerPixel at the specified zoom level. Otherwise return the current value.

Returns:

Type	Description
number | this

updateAttribution(){this}

map.js, line 1616

Update the attribution notice displayed on the bottom right corner of the map. The content of this notice is managed by individual layers. This method queries all of the visible layers and joins the individual attribution notices into a single element. By default, this method is called on each of the following events:

• geo.event.layerAdd
• geo.event.layerRemove

In addition, layers should call this method when their own attribution notices have changed. Users, in general, should not need to call this.

Returns:

Type	Description
this	Chainable.

worldToDisplay(c){geo.screenPosition|Array.<geo.screenPosition>}

map.js, line 810

Convert from world coordinates to display coordinates using the attached camera.

Name	Type	Description
c	geo.worldPosition | Array.<geo.worldPosition>	The input coordinate to convert.

Returns:

Type	Description
geo.screenPosition | Array.<geo.screenPosition>	Display space coordinates.

worldToGcs(c, gcs){geo.geoPosition|Array.<geo.geoPosition>}

map.js, line 766

Convert from map world coordinates to gcs coordinates.

Name	Type	Description
c	geo.worldPosition | Array.<geo.worldPosition>	The input coordinate to convert.
gcs	string | geo.transform | null	optional output gcs. undefined to use the interface gcs, null to use the map gcs, or any other transform.

Returns:

Type	Description
geo.geoPosition | Array.<geo.geoPosition>	GCS space coordinates.

zoom(val, origin, ignoreDiscreteZoom){number|this}

map.js, line 409

Get/Set zoom level of the map.

Name	Type	Description
val	number	optional If undefined, return the current zoom level. Otherwise, the new zoom level to set.
origin	object	optional If present, specifies the center of the zoom; otherwise the map's display center is used. Name Type Description geo geo.geoPosition The gcs coordinates of the zoom center. map geo.screenPosition The display coordinates of the zoom center.
ignoreDiscreteZoom	boolean	optional If true, ignore the discreteZoom option when determining the new view.

Fires:

• geo.event.zoom
• geo.event.pan

Returns:

Type	Description
number | this

zoomAndCenterFromBounds(bounds, rotation, gcs){geo.zoomAndCenter}

map.js, line 1392

Get the center zoom level necessary to display the given bounds.

Name	Type	Description
bounds	geo.geoBounds	The requested map bounds. right must be greater than left and bottom must be greater than top in the map's gcs (after conversion from the provided gcs).
rotation	number	Rotation in clockwise radians.
gcs	string | geo.transform | null	optional undefined to use the interface gcs, null to use the map gcs, or any other transform.

Returns:

Type	Description
geo.zoomAndCenter

zoomRange(arg, noRefresh){object|this}

map.js, line 1003

Get or set the min/max zoom range.

Name	Type	Description
arg	object	optional The zoom range. Name Type Description min number optional The minimum zoom level. max number optional The maximum zoom level.
noRefresh	boolean	optional If true, don't update the map if the zoom level has changed.

Returns:

Type	Description
object | this	The current zoom range or the map object. The min value is the minimum value that the map can go to based on the current dimensions and settings, the origMin value is the value that was specified via this function or when the map was created.

innerlayerZIndexSort(a, b){number}

map.js, line 1544

Comapare two layers by zIndex. If the zIndex is the same, the order in the parent element is used. If the two layers don't have the same parent (for instance, one layer isn't attached to the map), layers in the map are sorted below detached layers.

Name	Type	Description
a	geo.layer	First layer to compare.
b	geo.layer	Second layer to compare.

Returns:

Type	Description
number	Positive if a is above b.