[OpenLayers-Users] very slow map using WKT Multipolygon with a lot of Points

[Xavier Mamano (jorix)]

Hi,

Warning: SVG2 was created in 2.11, and in version 2.12 SVG2 was classified
as deprecated. SVG2 cause some behavioral problems in some browsers.


Fabrizio wrote
> 2012/11/18 Sergeant_york <

> electronicpanda@

> >
> 
>> Codes seems okay to me. The only thing that can cause performance issue
>> could
>> be transforming from 4326 to map projection but after initializing
>> geometries it shouldn't affect the performance.
>>
>> In my opinion, you can:
>>
>> 1- Try to change renderers to get best performance.
>>
> 
> as said in the openlayers 2.11 release notes I put the following line
> before any Vector and
> it is way more fast dragging which was one of my targets, so really good
> point.
> 
> OpenLayers.Layer.Vector.prototype.renderers = ["SVG2", "VML", "Canvas"];
> 
> 
> 
>> 2- Simplify geometries with respect to zoom levels.
>>
> 
> 
> Is there a method to simplify geometries automatically?
> 
> 
>> 3- Try to keep fill opacity to 0 and stroke opacity to 1 (should be
>> tested)
>>
> 
> It does not change performances
> 
> 
>> 4- Draw only the place inside the bounding box
>>
> 
> what do you mean , I should reduce the bbox?
> 
> 
>>
>> These are the things which I can say, but unfortunately with many
>> vertexes
>> openlayers (even in chrome) gives a bit bad performance. So don't expect
>> to
>> get results like desktop applications.
>>
> 
> 
> Yes, it is still very slow loading the vertexes.... I'm thinking about
> reducing the polygon vertexes, do you know any algorithm or any way to
> simplify polygons?
> 
>  thanks
> 
> 
> -- 
> Fab
> 
> http://twitter.com/fabrizioburatta
> 
> http://www.linkedin.com/in/fburatta
> 
> http://nonfartiprenderedalpanico.blogspot.com/
> 
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