vtkGeoSource

Section: Visualization Toolkit Geo Vis Classes

Usage

vtkGeoSource is an abstract superclass for all multi-resolution data sources shown in a geographic view like vtkGeoView or vtkGeoView2D. vtkGeoSource subclasses need to implement the FetchRoot() method, which fills a vtkGeoTreeNode with the low-res data at the root, and FetchChild(), which produces a refinement of a parent node. Other geovis classes such as vtkGeoTerrain, vtkGeoTerrain2D, and vtkGeoAlignedImageSource use a vtkGeoSource subclass to build their geometry or image caches which are stored in trees. The source itself does not maintain the tree, but simply provides a mechanism for generating refined tree nodes.

Sources are multi-threaded. Each source may have one or more worker threads associated with it, which this superclass manages. It is essential that the FetchChild() method is thread-safe, since it may be called from multiple workers simultaneously.

To create an instance of class vtkGeoSource, simply invoke its constructor as follows

  obj = vtkGeoSource

Methods

The class vtkGeoSource has several methods that can be used. They are listed below. Note that the documentation is translated automatically from the VTK sources, and may not be completely intelligible. When in doubt, consult the VTK website. In the methods listed below, obj is an instance of the vtkGeoSource class.