Class aRTtheme

Description

Class that enables database queries with temporal and (or) attributes restrictions. It can be created using the results of a spatial query, passing the ids. Temporal queries are executed creating an aRTquerier object from this object.

Themes in TerraLib can have visual aspects, as colors and lines styles. These configurations are not used when an aRTtheme object is created, besause it can be used only for processing. But there are functions to do this, for example setVisual and setVisible.

Objects from the Class

Objects can be created by calls of the form new("aRTtheme", aRTlayer, themename). To avoid creating objects this way, there are two functions of class aRTlayer: createTheme and openTheme. openTheme is a function of class aRTdb too.

Arguments

layer

The layer where the theme is associated. Object of class aRTlayer.

themename

The theme name. The default value is the layer name.

create

Creates a new theme when TRUE, and open a existing theme when FALSE. The default is FALSE.

tables

The table(s) of the used layer.

viewname

The view name. The default is the theme name.

Extends

Class aRTcomponent, directly.

Methods

getAttributes

Do a query and return all.

getBox

Returns the bounding box.

getData

Returns all attributes and geometry of a layer.

getGeometry

Returns all the geometry associated with the object.

setVisible

Changes the visibility of a theme (visible or not).

setVisual

Sets the colors associated to a theme's geometry.

Author(s)

Marcos Aurelio Carrero, Pedro Ribeiro de Andrade Neto

See Also

See aRTtheme-METHOD for a method of this class or CLASSNAME-class for links to other classes.