[OpenLayers-Users] rules depending on state

[Tim Schaub]

Pierre GIRAUD wrote:
> Yep,
> I already tried that and this works great.
> However, what if I want to set fillColor, strokeColor, fillOpacity and
> strokeOpacity at the same time ? This is really painful.
> And it seems like I need to provide a valid value for each possible
> value of state. Default style won't be applied to features that aren't
> in the switch cases.
> 
> I would prefer something like :
> var lookup = {
>     'Insert': {
>         fillColor: 'green',
>         fillOpacity: 0.5
>     },
>     ...
> };
> 

Yes, you're right, you need a different function for each symbolizer 
property.  However, it shouldn't be too painful.

function getValue(state, key) {
     var value = lookup[state][key];
     if(value == undefined) {
         value = defaultSymbolizer[key];
     }
     return value;
}
var context = {
     getFillColor: function(feature) {
         return getValue(feature.state, "fillColor");
     },
     ...
};

Wouldn't be too hard to allow the symbolizer to be a function.  This 
function would be called for each feature and would return a symbolizer. 
  In fact, this seems more intuitive than the style context stuff.

The style stuff can be made less twisted in OL3.

Tim


> Regards,
> Pierre
> 
> 
> On Tue, May 13, 2008 at 4:35 PM, Andreas Hocevar
> <andreas.hocevar at gmail.com> wrote:
>> Hey Pierre,
>>
>>  without having tried, something like the following should work:
>>
>>  var context = {
>>    getStateColor: function(feature) {
>>        switch(feature.state) {
>>            case "Insert": return "green";
>>            case "Update": return "yellow";
>>            case "Delete": retrun "red";
>>        }
>>    }
>>  }
>>
>>  var styleMap = new OpenLayers.StyleMap(new OpenLayers.Style({
>>    strokeColor: "${getStateColor}"
>>  }, {context: context}));
>>
>>  Regards,
>>  Andreas.
>>
>>
>>  Pierre GIRAUD wrote:
>>
>>>
>>>
>>> Hello OpenLayers styleMap gurus,
>>>
>>> I would like to have different symbolizers for the features depending
>>> on their state property.
>>> The addUniqueValueRules would look perfect for that but the context of
>>> the generated rules is feature.attributes. The state will not be
>>> evaluated because it's not one of those attributes.
>>>
>>> Has anyone a workaround to advice ?
>>>
>>> Regards,
>>>
>>> Pierre
>>> _______________________________________________
>>> Users mailing list
>>> Users at openlayers.org
>>> http://openlayers.org/mailman/listinfo/users
>>>
>>>
>>
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