ó i4Vdc@s¨ddlmZddlmZmZmZmZmZddlm Z m Z m Z m Z ddl mZddlmZedZdeZdefd„ƒYZd S( iÿÿÿÿ(tunicode_literals(tatantexptlogtpitsin(t GEOSGeometryt LinearRingtPointtPolygon(tGoogleMapException(trangeg€f@t GoogleZoomcBs\eZdZddd„Zd„Zd„Zd„Zd„Zd„Zd „Z d „Z RS( u 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 iicCs˜||_||_g|_g|_g|_|}x^t|ƒD]P}|jj|dƒ|jj|dtƒ|jj|dƒ|d9}q@WdS(u#Initializes the Google Zoom object.g€v@iN(t _tilesizet_nzoomt_degppt_radppt_npixR tappendR(tselftnum_zoomttilesizetzti((sq/var/www/html/phendo-backend/phendo_python/env/lib/python2.7/site-packages/django/contrib/gis/maps/google/zoom.pyt__init__s     cCs|jS(u"Returns the number of zoom levels.(R(R((sq/var/www/html/phendo-backend/phendo_python/env/lib/python2.7/site-packages/django/contrib/gis/maps/google/zoom.pyt__len__7scCs7t|tƒr!|j\}}n |\}}||fS(u:Unpacks longitude, latitude from GEOS Points and 2-tuples.(t isinstanceRtcoords(Rtlonlattlontlat((sq/var/www/html/phendo-backend/phendo_python/env/lib/python2.7/site-packages/django/contrib/gis/maps/google/zoom.pyt get_lon_lat;s c Csž|j|ƒ\}}|j|}t|||j|ƒ}tttt|ƒdƒdƒ}t|dtd|d|ƒd|j |ƒ}||fS(uHConverts a longitude, latitude coordinate pair for the given zoom level.g§èH.ÿï¿g§èH.ÿï?gà?igð¿( RRtroundRtmintmaxRtDTORRR( RRtzoomRRtnpixtpx_xtfactpx_y((sq/var/www/html/phendo-backend/phendo_python/env/lib/python2.7/site-packages/django/contrib/gis/maps/google/zoom.pytlonlat_to_pixelCs  "5cCsŠt|ƒdkr!tdƒ‚n|j|}|d||j|}tdtt|d|d|j|ƒƒdt}||fS(uGConverts a pixel to a longitude, latitude pair at the given zoom level.iu+Pixel should be a sequence of two elements.iigð¿gà?( tlent TypeErrorRRtRTODRRRR(RtpxR$R%RR((sq/var/www/html/phendo-backend/phendo_python/env/lib/python2.7/site-packages/django/contrib/gis/maps/google/zoom.pytpixel_to_lonlatZs  9cCs­|jd}|j||ƒ}|j|d||d|f|ƒ}|j|d||d|f|ƒ}tt||d|df||d|df|ƒddƒS(uó Returns a Polygon corresponding to the region represented by a fictional Google Tile for the given longitude/latitude pair and zoom level. This tile is used to determine the size of a tile at the given point. iiitsridiæ(R R)R.R R(RRR$tdeltaR-tlltur((sq/var/www/html/phendo-backend/phendo_python/env/lib/python2.7/site-packages/django/contrib/gis/maps/google/zoom.pyttileks  ((c CsÜt|tƒ s|jdkr.tdƒ‚n|j}|j|jƒ\}}|j}xvt|j ƒD]e}|j|j ||ƒjƒ\}}||ksª||krh|dkrÅt dƒ‚n|dSqhW|j dS(u6Returns the optimal Zoom level for the given geometry.iæu8get_zoom() expects a GEOS Geometry with an SRID of 4326.iu>Geometry width and height should not exceed that of the Earth.i( RRR/R+tenvelopetget_width_heighttextenttcentroidR RR3R ( Rtgeomtenvtenv_wtenv_htcenterRttile_wttile_h((sq/var/www/html/phendo-backend/phendo_python/env/lib/python2.7/site-packages/django/contrib/gis/maps/google/zoom.pytget_zoom€s  $  cCs_t|d ƒ}t|d|dƒ}t|dƒ}|j|ƒ}|j|ƒ}||fS(uD Returns the width and height for the given extent. iii(Rtdistance(RR6R1tulR2theighttwidth((sq/var/www/html/phendo-backend/phendo_python/env/lib/python2.7/site-packages/django/contrib/gis/maps/google/zoom.pyR5šs ( t__name__t __module__t__doc__RRRR)R.R3R?R5(((sq/var/www/html/phendo-backend/phendo_python/env/lib/python2.7/site-packages/django/contrib/gis/maps/google/zoom.pyR s       N(t __future__RtmathRRRRRtdjango.contrib.gis.geosRRRR t#django.contrib.gis.maps.google.gmapR tdjango.utils.six.movesR R#R,tobjectR (((sq/var/www/html/phendo-backend/phendo_python/env/lib/python2.7/site-packages/django/contrib/gis/maps/google/zoom.pyts("