Mastering Geospatial Development with QGIS 3.x
上QQ阅读APP看书，第一时间看更新
上一章目录下一章

Using diagrams to display thematic data

To add a diagram, open the vector's Layer Properties window and then click on the Diagrams tab. The Diagrams tab, as shown in the following screenshot, has five sections, as well as a Diagram type selector.

QGIS supports the addition of three diagram types as overlays on top of vector data. The three diagram types are   pie chart,   text diagram, and   histogram. The underlying vector data can still be styled to provide a nice base map.

The Diagram type selector allows you choose which type of diagram to use: Pie chart, Text diagram, or Histogram. When you choose a type of diagram, the other five sections change to contain the options that are appropriate for the diagram type.

The sections are Attributes, Rendering, Size, Placement, Options, and Legend. Attributes is common to all diagram types and provides the mechanism for adding attributes to diagrams. Size and Placement contain parameters that are shared by all of the diagram types. Appearance and Options, however, contain parameters that are unique to each diagram type:

上一章目录下一章