:tocdepth: 3

:py:mod:`gws.gis.zoom`
======================

.. py:module:: gws.gis.zoom


**Source code:** :source:`gws.gis.zoom<gws/gis/zoom/__init__.py>`



Package Contents
----------------



.. py:class:: Config(*args, **kwargs)


   Bases: :py:obj:`gws.Config`

   Zoom levels and resolutions

   .. py:attribute:: initResolution
      :type:  Optional[float]

      initial resolution

   .. py:attribute:: initScale
      :type:  Optional[float]

      initial scale

   .. py:attribute:: maxResolution
      :type:  Optional[float]

      maximal resolution

   .. py:attribute:: maxScale
      :type:  Optional[float]

      maximal scale

   .. py:attribute:: minResolution
      :type:  Optional[float]

      minimal resolution

   .. py:attribute:: minScale
      :type:  Optional[float]

      minimal scale

   .. py:attribute:: resolutions
      :type:  Optional[list[float]]

      allowed resolutions

   .. py:attribute:: scales
      :type:  Optional[list[float]]

      allowed scales


.. py:function:: init_resolution(cfg, resolutions: list) -> float

   Returns the initial resolution.

   :param cfg: A config.
   :param resolutions: List of Resolutions.


.. py:data:: OSM_RESOLUTIONS

   Resolutions corresponding to OSM zoom levels.

.. py:data:: OSM_SCALES
   :value: [500000000, 250000000, 150000000, 70000000, 35000000, 15000000, 10000000, 4000000, 2000000,...


   //wiki.openstreetmap.org/wiki/Zoom_levels)

   :type: Scales corresponding to OSM zoom levels. (https

.. py:function:: resolutions_from_bounds(b: gws.Bounds, tile_size: int) -> list[float]

   Loads resolutions from bounds.

   :param b: Bounds object.
   :param tile_size: The tile size.

   :returns: A list of resolutions.


.. py:function:: resolutions_from_config(cfg, parent_resolutions: list[float] = None) -> list[float]

   Loads resolution from a config.

   :param cfg: A config.
   :param parent_resolutions: List of parent resolutions.

   :returns: A list of resolutions.


.. py:function:: resolutions_from_source_layers(source_layers: list[gws.SourceLayer], parent_resolutions: list[float]) -> list[float]

   Loads resolution from a source layers.

   :param source_layers: Source layers.
   :param parent_resolutions: List of parent resolutions.

   :returns: A list of resolutions.