Arcxml learning notes (2)

xiaoxiao2021-03-06 41

The configuration of the map is defined by the element, which is represented by the layer composition, and the layer Layer contains two problems 1, from which data sets are data; 2, how these data is drawn; : 1. DataSet Defines the data set used by the layer; 2. Renderer defines how to display the layer on the client;

DataSet can be a layer, or a set of layers will use the partition element.

SIMPLERENDERER uses the same symbols to paint all features, ValueMapRenderer sends only a specific proportional scale in accordance with different values of a column of the layer table, or different values, respectively. ScaleDependntrenderer draws only a particular scale range. The plurality of performance methods in the layer must be included in a grouprenderer.

The relationship is as follows:

Symbolization: Transforming vector information to the symbol to be represented, basically inclusive: transform point objects into related symbols - SIMPLEMARKERSYMBOL will translate the line object to related symbols - Simplandymbol will be converted to related symbols - SimplePolygonsymbol

Each renderer element contains a variety of Symbol elements;

Defines the fill color of the simple polygon, does not display the boundary; and GroupRendere combines different drawings; ValueMapRenderer finger For example, according to a field value of the database, the corresponding color is fill the color, such as a list of criminal properties, is columns: Code ==== 1 first-level murder 2 fraud 3 Stealing 4. .

Representation of the first-level murder; fraud is expressed in circular; such a layer, according to his list Different values, or different values portrayed

"10000000" label = "Large"> Valuemaplabelrender is a list of marked fields

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