[OpenLayers-Users] Not change the size o polygons with zoom change

[Jose A. C.]

Hi!

I'm trying to rotate the symbols around their own center but I can´t; they
rotate around another point, In my opinion, the only choice is extend
OpenLayers.Renderer.symbol  in OpenLayers.Renderer.Elements, to define a
element for each angle that I need, from 0 up to 360 degrees.

Another possibility is to create polygons but they change their size with
the changes of the zoom of the map and I don´t want this, I need that their
size constant.

Has someone any idea of how I can do this?

Thank you for your help!!

 Regards!!!


2008/8/4 Jose A. C. <joscalv at gmail.com>

> Hi!
>
> This solution is perfect, but I need to rotate the polygons around their
> own center, since the rotate function doesn´t change their inclination, it
> just change their position.
>
> The code is:
>
>             features[4].geometry.rotate(30,new
> OpenLayers.Geometry.Point(map.maxExtent.left + (4 * slot) + (slot / 2), 0));
>             features[4].layer.drawFeature(features[4]);
>
>             features[1].geometry.rotate(30,new
> OpenLayers.Geometry.Point(5,5));
>             features[1].layer.drawFeature(features[1]);
>
> where features array comes from the example
> http://openlayers.org/dev/examples/graphic-name.html.
>
> Thanks!!!
>
> 2008/8/1 Christopher Schmidt <crschmidt at metacarta.com>
>
> On Fri, Aug 01, 2008 at 08:39:54AM +0200, Jose A. C. wrote:
>> > I'm making a map, and I need to create polygons on it that don´t change
>> its
>> > size when the zoom of the map change. I don´t use a mark because I need
>> to
>> > rotate it.
>>
>> Sounds like you want this:
>>
>> http://openlayers.org/dev/examples/graphic-name.html
>>
>> There's a set of constants in OpenLayers.Renderer.symbol  in
>> OpenLayers.Renderer.Elements which you could extend.
>>
>>
>> > I have another problem:  I draw different layers with different units
>> and
>> > when it is draw the size of the figure is the same in spite of  having
>> > different measures unit (Km and inches). The code is:
>>
>> The units of the layer have no control over anything. Your units you are
>> providing are *map* units -- and the *name* you give to those units is
>> irrelevant. What you want to do is change the size of the units. If you
>> want to create something that's a different size, you need to provide
>> the correct size in current map units. (Your map is probably in
>> degrees.)
>>
>> Regards,
>> --
>> Christopher Schmidt
>> MetaCarta
>>
>
>
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