Method Overview

Method Details

cloneScheme(scheme){Object}

Clones a size scheme object.

Parameter:

scheme PointSizeScheme | PolylineSizeScheme | PolygonSizeScheme The SizeScheme object to clone.

Returns:

Type	Description
Object	Returns a clone of the given size scheme object.

Example:

// clones the primary scheme returned from the getSchemes() method
var sizeScheme = primaryScheme.clone();

getSchemes(params){Object}

Returns a primary scheme and secondary schemes defining symbol properties for size-based data-driven visualizions in a FeatureLayer. The basemap parameter determines the color of the graphics used to visualize each feature. The geometryType determines which type of symbol to return.

Parameters:

params Object See the table below for details of each parameter that may be passed to this function. Specification: basemap String | Basemap The basemap to pair with the visualization. This value indicates the best symbol color for visualizing features against the given basemap. geometryType String The geometry type of the features to visualize. Known Values: point | multipoint | polyline | polygon view SceneView optional The SceneView instance in which the scheme will be used. This property is only applicable when the scheme will be used in conjunction with 3D symbols. worldScale Boolean optional Indicates if the size units of the scheme will be in meters. This should be true when the scheme is intended for 3D volumetric symbology. A view must be provided if this property is set to true.

Returns:

Type

Description

Object

Returns an object containing the optimal size scheme to use for the given basemap and secondary schemes that may also be used. See the table below for more details of this object. Property Type Description primaryScheme PointSizeScheme | PolylineSizeScheme | PolygonSizeScheme The size scheme best suited for the given basemap and geometry type. secondarySchemes Object[] Additional size schemes that may be used to visualize data of the given geometry type overlaid on the given basemap.

Example:

// gets the primary scheme for the features of the given geometry type and basemap
var schemes = sizeSchemes.getSchemes({
  basemap: map.basemap,
  geometryType: featureLayer.geometryType
});

// the best default scheme for the layer and basemap
var primaryScheme = schemes.primaryScheme;

Type Definitions

PointSizeScheme

Properties defining the symbology scheme used to visualize point features driven by attribute data.

Properties:

color Color The fill color of the marker symbol.

noDataColor Color The color of the marker symbol used to indicate features with no data and features that are out of range.

outline Object Properties for defining the outline of the marker symbol. Specification: color Color The outline color of the marker symbol. width Number The width of the marker symbol in pixels or points.

size Number The default size of the marker symbol in pixels or points.

noDataSize Number The size of the marker symbol (in pixels or points) used to indicate features with no data and features that are out of range.

minSize Number The minimum size of a marker symbol in pixels or points representing features with low data values.

maxSize Number The maximum size of a marker symbol in pixels or points representing features with high data values.

opacity Number The opacity of the marker symbol.

PolygonSizeScheme

Properties defining the symbology scheme used to visualize polygon features driven by attribute data. When visualized by size, polygons are represented with marker symbols.

Properties:

marker PointSizeScheme The scheme defining the symbology of the marker symbol used to represent polygon features by size.

background Object The schema defining the backgound symbol of the feature. This is a fill symbol. Properties: color Color The color of the fill symbol representing the polygon. outline Object Properties for defining the outline of the background fill symbol. Specification: color Color The outline color of the background fill symbol. width Number The width of the background fill symbol's outline in pixels or points.

opacity Number The opacity of the symbol.

PolylineSizeScheme

Properties defining the symbology scheme used to visualize polyline features driven by attribute data.

Properties:

color Color The color of the line symbol.

noDataColor Color The color of the line symbol used to indicate features with no data and features that are out of range.

width Number The default width of the line symbol in pixels or points.

noDataWidth Number The width of the line symbol in pixels or points used to indicate features with no data and features that are out of range.

minWidth Number The minimum width of a line symbol in pixels or points representing features with low data values.

maxWidth Number The maximum width of a line symbol in pixels or points representing features with high data values.

opacity Number The opacity of the line symbol.