I use zoom_to_box and it works for me. The only other option I can see
is to pan and zoom to a specific point and zoom level. But I don't feel
it gives me enough control.
If the bounding box in the envelope does not match the proportions of
your image (900 x 450) then the box is expanded in the longer direction.
You can then use env = myMap.envelope() to get the actual envelope used.
You could always write your own function to take a single coordinate for
the center and a scale denominator then construct an envelope from those
values.
Andy
Balram wrote:
> Hi friends,
>
> I have created python script to render map using mapnik. I have done basic
> map operation like pan to left, right,top, bottom. I have also done zoom to
> map.
>
> But I am not able to zoom at particular latitude longitude values. I don't
> want to use Envelope() which takes four parameter.
>
> My code is as below:
>
> myMap = Map(900,450,"+proj=latlong +datum=WGS84")
> p = Projection("+proj=latlong +datum=WGS84")
>
> myMap.zoom_to_box(p.forward(Envelope(52.132633,5.291266,52.182633,5.361266)))
> myMap.zoom(0.4)
> render_to_file(myMap,"proj.png","png")
>
> Please help me.
> Any help would be greatly appreciated!!!
> Thank You!!!
>
> BalRam
--
Andy
PGP Key ID: 0xDC1B5864
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