Jon Burgess-2 wrote:
>
> On Mon, 2009-01-19 at 00:01 -0800, NileshPasalkar wrote:
>>
>>
>> Jon Burgess-2 wrote:
>> >
>> > On Wed, 2009-01-14 at 00:09 -0800, NileshPasalkar wrote:
>> >> I want to zoom map depends upon to Lat long value what I found is only
>> >> one
>> >> function take lat long value as param which is Query_Map_point. I
>> don;t
>> >> found the relevant information for this function so if any body has
>> any
>> >> idea about what this function does please let me know,
>> >
>> > You need to create a bounding box envelope with the map co-ordinates
>> and
>> > then call the map zoom, for a fairly simple example see:
>> >
>> >
>> http://trac.openstreetmap.org/browser/applications/rendering/mapnik/generate_image.py
>> >
>> > Jon
>> >
>> >
>> > _______________________________________________
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>> > [email protected]
>> > https://lists.berlios.de/mailman/listinfo/mapnik-users
>> >
>> >
>>
>> Hi Jon Burgess,
>>
>> I have tried with the boundary box but I don;t able to use it. I have
>> out
>> put with blank image this is the code I have done for it
>>
>>
>> from mapnik import *
>> from mapnik import Projection, Coord
>>
>> m = Map(600,300,"+proj=latlong +datum=WGS84")
>> m.background = Color('rgb (205, 227, 237)')
> ...
>> En = Envelope(-50,-50,1000,1000)
>
> Where do you get these numbers from? 1000 is not a valid lat/long.
> For a simple world map you want:
>
> En = Envelope(-180.0,-90.0, 180.0,90.0)
>
>> m.zoom_to_box(En)
>> render_to_file(m,'world.png', 'png')
>
> Jon
>
>
>
> _______________________________________________
> Mapnik-users mailing list
> [email protected]
> https://lists.berlios.de/mailman/listinfo/mapnik-users
>
>
Hi Jon
It was just example it wasn't correct value but still if I want to know
that we can directly pass the lat long value to the Envelope() methods, it
don;t look like that because I try for this but it wasn;t work with it so as
per my knowledge we need to convert this lat long value into map coordinates
some how.
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