Personal tools
You are here: Home gvSIG Projects gvSIG Desktop Documentation User documentation gvSIG-Desktop 1.11. User manual (online)
gvSIG Desktop
gvSIG Desktop

Cached time 11/21/13 15:05:38 Clear cache and reload

 
Document Actions

gvSIG-Desktop 1.11. User manual

by Mario Carrera last modified 2013-07-30 16:04

gvSIG supports the most common types of legends: unique value and range and value themes as well as the scale-range control over the whole layer. ArcIMS goes much further in its configuration. It can generate much more complicated legends in which symbols can be grouped together, scale-range controls can be established for labels and symbols and different labelling based on an attribute can be shown (as though it were a value theme for labelling).

This group of legends can generate very complex symbols for a layer in the end. The current implementation status of the gvSIG symbols needs to be simplified to reach a compromise to recover the symbols that best represent the layer as a whole.

Label Description
GROUPRENDERER Legend which groups others together
SCALEDEPENDENTRENDERER Scale dependent legend
SIMPLELABELRENDERER Labelling layer legend
SIMPLERENDERER Unique value layer legend
VALUEMAPRENDERER Value and range themes
VALUEMAPLABELRENDERER Labelling themes

Table 2: ArcXML legend definition labels

When a GROUPRENDERER is found, the symbol ArcIMS draws first is always chosen. Thus, in the case of the typical motorway symbol for which a thick red line is drawn and a thinner yellow line is drawn over it, gvSIG will only show the red line with its specific thickness.

If a scale dependent legend is discovered during a symbol analysis, this is always chosen. If more than one is discovered, the one with the greatest detail is chosen. For example, in ArcIMS we can have a layer with simple road symbols (only main roads are drawn) on a 1:250000 scale and based on this a different theme is shown with all types of roads (paths, tracks, roads, etc.). In this case, gvSIG will show this last theme as it is the most detailed.

If a labelling legend is discovered during a symbol analysis, it will be saved in a different place and will be assigned to the selected definitive legend. In the case of the VALUEMAPLABELRENDERER label, only the legend of the first processed value will be obtained as a label symbol. The rest will be rejected.

In short, it is obvious that the failure to adapt the legends for gvSIG is a simplification process in which different legend and symbol definitions must be rejected to obtain a legend which is similar to the original as far as possible. It is to be expected that the gvSIG symbol definition will improve considerably so that it can support a larger group of cases in the future.

Cached time 11/21/13 06:54:32 Clear cache and reload

Get freemind document

View source document Get permanent link


Powered by Plone CMS, the Open Source Content Management System

This site conforms to the following standards: