Paul Austin wrote: Hi,
> I've been thinking about the styling of layers again in OpenJUMP. The > mechanism we have now is very flexible and allows us to do some really > fancy styling fairly easy. > > The only problem I have with it is that if you want to support multiple > styles per layer aka colour theming style of my filter style it renders > each feature twice, once with the basic style and once with the feature > style. This is because contention between the basic styles, colour > theming styles and my filter style. > > What I would like to propose is a two tier styling approach. > > At the top level we have the style manager. The style manager is > responsible for controlling what styles are used to render a specific > feature. The layer rendering mechanism would use the style manager to > say please render this feature. > > There would be a DefaultStyleManager which would behave exactly like the > current mechanisms with full backward compatibility on the layer with > the current layer related style mechanisms. > > We would then implement a ColourThemingStyleManager which would handle > theming on single attribute values. > > And a FilterThemingStyleManager for my stuff. > > There would be one active StyleManager for a layer at a time and the > Style dialog would change so you select which manager to use and then > have the different options for the styles once you select it. > > Any comments/suggestions on this approach? I'm for your approach. I've also been wondering whether to consider the current behaviour a bug ;-) Best regards, Andreas -- l a t / l o n GmbH Aennchenstrasse 19 53177 Bonn, Germany phone ++49 +228 18496-11 fax ++49 +228 1849629 http://www.lat-lon.de http://www.deegree.org
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