3 (h@s|ddlmZddlmZmZmZmZmZddlm Z m Z m Z m Z ddl mZddlmZedZdeZGdddeZd S) )unicode_literals)atanexplogpisin) GEOSGeometry LinearRingPointPolygon)GoogleMapException)rangegf@c@sReZdZdZdddZddZdd Zd d Zd d ZddZ ddZ ddZ dS) GoogleZooma GoogleZoom is a utility for performing operations related to the zoom levels on Google Maps. This class is inspired by the OpenStreetMap Mapnik tile generation routine `generate_tiles.py`, and the article "How Big Is the World" (Hack #16) in "Google Maps Hacks" by Rich Gibson and Schuyler Erle. `generate_tiles.py` may be found at: http://trac.openstreetmap.org/browser/applications/rendering/mapnik/generate_tiles.py "Google Maps Hacks" may be found at http://safari.oreilly.com/0596101619 cCst||_||_g|_g|_g|_|}xLt|D]@}|jj|d|jj|dt|jj|d|d9}q,WdS)z#Initializes the Google Zoom object.gv@N) _tilesize_nzoom_degpp_radpp_npixr appendr)selfZnum_zoomZtilesizezirG/tmp/pip-install-q3hcpn_q/Django/django/contrib/gis/maps/google/zoom.py__init__szGoogleZoom.__init__cCs|jS)z"Returns the number of zoom levels.)r)rrrr__len__7szGoogleZoom.__len__cCs&t|tr|j\}}n|\}}||fS)z:Unpacks longitude, latitude from GEOS Points and 2-tuples.) isinstancer Zcoords)rlonlatlonlatrrr get_lon_lat;s  zGoogleZoom.get_lon_latc Cs||j|\}}|j|}t|||j|}tttt|dd}t|dtd|d|d|j |}||fS)zHConverts a longitude, latitude coordinate pair for the given zoom level.gH.?g?g?gH.g) r#rroundrminmaxrDTORrr) rr zoomr!r"npixZpx_xZfacZpx_yrrrlonlat_to_pixelCs  .zGoogleZoom.lonlat_to_pixelcCsnt|dkrtd|j|}|d||j|}tdtt|d|d|j|dt}||fS)zGConverts a pixel to a longitude, latitude pair at the given zoom level.rz+Pixel should be a sequence of two elements.rr$g?g?g) len TypeErrorrrRTODrrrr)rpxr)r*r!r"rrrpixel_to_lonlatZs   2zGoogleZoom.pixel_to_lonlatcCs|jd}|j||}|j|d||d|f|}|j|d||d|f|}tt||d|df||d|df|ddS)z Returns a Polygon corresponding to the region represented by a fictional Google Tile for the given longitude/latitude pair and zoom level. This tile is used to determine the size of a tile at the given point. rrr$i)srid)rr+r0r r )rr r)deltar/llurrrrtileks     zGoogleZoom.tilec Cst|t s|jdkrtd|j}|j|j\}}|j}xRt|j D]D}|j|j ||j\}}||ksr||krF|dkrt d|dSqFW|j dS)z6Returns the optimal Zoom level for the given geometry.iz8get_zoom() expects a GEOS Geometry with an SRID of 4326.rz>Geometry width and height should not exceed that of the Earth.r$) rrr1r-Zenvelopeget_width_heightextentZcentroidr rr5r ) rZgeomenvZenv_wZenv_hcenterrZtile_wZtile_hrrrget_zooms zGoogleZoom.get_zoomcCsNt|dd}t|d|d}t|dd}|j|}|j|}||fS)zD Returns the width and height for the given extent. Nrr)r Zdistance)rr7r3ulr4heightwidthrrrr6s   zGoogleZoom.get_width_heightN)rr) __name__ __module__ __qualname____doc__rrr#r+r0r5r:r6rrrrrs  rN) __future__rmathrrrrrZdjango.contrib.gis.geosrr r r Z#django.contrib.gis.maps.google.gmapr Zdjango.utils.six.movesr r(r.objectrrrrrs