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DotDensityRenderer | API Reference | ArcGIS API for JavaScript 3.46

require(["esri/renderers/DotDensityRenderer"], function(DotDensityRenderer) { /* code goes here */ });

(Added at v3.7)

The

provides the ability to create dot density visualizations on data. A dot density map can be used to visualize the variation in spatial density of a discrete spatial phenomenon. You can visualize only one variable (for example, 1 dot = 25,000 acres harvested) or multiple variables (for example, 1 green dot = 10,000 acres of corn harvested; 1 brown dot = 10,000 acres of wheat harvested) on one map.

Things to consider when making dot density maps:

• The fields property allows you to specify multiple fields. You may utilize this property to visualize multiple variables on one map with different colors. For example, use different colors to show the distribution of various ethnic groups.
• dotValue and dotSize drive the visual effects on your map. A good practice is to set the size and value of the dot so that the feature with the highest value in the layer is ~80% covered in dots.
• The density on map always changes as the user zooms in or zooms out. Use the ScaleDependentRenderer to set a unique dot density renderer for each scale or zoom range, so the dotValue and dotSize can vary across multiple scale ranges.
• Dot density maps tend to break down at larger scales. Users start seeing patterns in the random distribution of the dots that do not exist in reality. For example, dot density visualizations on county datasets should only be viewed at the state or regional level.
• Dot density maps should always use equal area projections to ensure the density is based on the same area measurement everywhere on maps, although WebMercator could be acceptable at larger scales, as the exaggeration of area becomes negligible.
• Use popups to clearly communicate the actual value of the feature, so the user can explore the map visually and interactively.

More information on working with rendering, smart mapping, and using visual variables can be found in the Data Visualization guide topic and the multiple samples referenced within this topic.

Note: the dot density renderer uses canvas, which is not supported in versions 7 and 8 of Internet Explorer.

Search for

that use this class.

esri/renderers/Renderer
|_esri/renderers/DotDensityRenderer

Constructor Details

Creates a new instance of dot density renderer.

Typically one dot is more than one. For example if the value of the field being mapped is 150,000 and the dotValue is 1,000 the feature will have 150 dots randomly placed within the boundary of the feature. Values are rounded up. A value of 499 would not get a dot. A value of 500 would get one dot.

[
  {
    name: <String>,  
    color : <Color>
  },
  ...
]

• Name represents the name of the field to be mapped.
• Color represents the color of the dot.

require(["esri/renderers/DotDensityRenderer", ... ], function(DotDensityRenderer, ... ){
  var dotDensityRenderer = new DotDensityRenderer({
    fields: [{
      name: "M163_07",
      color: new Color([52, 114, 53])
    }],
    dotValue: 4000,
    dotSize: 2
  });

  layer.setRenderer(dotDensityRenderer);
});

Property Details

The color to be used for the background of the symbol. By default no background color will be applied.

The shape to be used for the dot.

Known values: "square" | "circle"

Default value: "square"

The size of the dot in pixels.

The value that a dot represents.

An array of objects, where each object defines a field to be mapped and its color.

[
  {
    name: <String>,  
    color : <Color>
  },
  ...
]

• Name represents the name of the field to be mapped.
• Color represents the color of the dot.

The line symbol to use on the outline of the feature. By default no outline will be applied.

Method Details

Gets the color for the Graphic. (Added at v3.8)

Returns the opacity value for the specified graphic. This is calculated using the

definition.

Returns the angle of rotation (in degrees) for the graphic calculated using rotationInfo. (Added at v3.7)

Return the symbol size (in pixels) for the graphic, calculated using sizeInfo. (Added at v3.7)

Gets the symbol for the Graphic.

Updates the background color of the shape. For the changes to take effect, you need to call

after calling this method.

Updates the size of the dot. Size represents screen pixels. For the changes to take effect, you need to call

after calling this method.

Updates the value that a dot represents. For the changes to take effect, you need to call

after calling this method.

Updates the outline symbol of the shape. For the changes to take effect, you need to call

after calling this method.

Converts object to its ArcGIS Server JSON representation. (Added at v2.1)

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