aRTtheme-setVisual {aRT} | R Documentation

## Set the theme's visual

### Description

Function to set the visual of a theme, to be visualized in a TerraLib-based GIS. If the visual has only one color, it will set the default visual of the geometric objects. If it has more than one color, the function will generate a slicing.

### Usage

    ## S4 method for signature 'aRTtheme':
    setVisual(object, visual, attribute="attname", mode="s")

### Arguments

`object` | Object of class `aRTtheme`.
`visual` | Object of class `aRTvisual`.
`attribute` | Theme attribute which values will be used to generate the slices.
`mode` | Type of slicing (see below).

### Slicing

The theme visual will be sliced if `visual` contains more then one color. Slices can be generated based on 5 different factors, represented by `mode`:

- equalsteps
- stddeviation
- quantil
- uniquevalue
- raster

When slicing a raster, `mode` will always be `raster`, and it will be divided into equal steps, according with its values (and no `attribute` is used). The other four modes are used with attributes.

### Author(s)

Pedro Ribeiro de Andrade Neto

### See Also

See `aRTtheme-class` to show the description of this class.

[Package aRT version 0.4-0 Index]