Source code for poets.web.overlays

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# Author: Maximilian Wonaschuetz
# Creation date: 2014-07-29

"""
This modules provides functions used while creating image overlays.
"""

from poets.shape.shapes import Shape


[docs]def bounds(country, shapefile=None): """ Returns the bounding box, center coordinates and zoom level for web overlay purposes. Parameters ---------- Country : str FIPS country code (https://en.wikipedia.org/wiki/FIPS_country_code) Returns ------- lon_min : int Minimum longitude. lon_max : int Maximum longitude. lat_min : int Minimum latitude. lat_max : int Maximum latitude. c_lat : int Center latidute of image. c_lon : int Center longitude of image. zoom : int Zoom level for openlayers. """ shp = Shape(country, shapefile) lon_min = shp.bbox[0] lon_max = shp.bbox[2] lat_min = shp.bbox[1] lat_max = shp.bbox[3] e_lon = lon_max - lon_min e_lat = lat_max - lat_min c_lon = lon_min + e_lon / 2 c_lat = lat_min + e_lat / 2 zoom = 0 i = 1024 # To be replaced with the width of the map container! while i / 2 > e_lon: zoom += 1 i = i / 2 return lon_min, lon_max, lat_min, lat_max, c_lat, c_lon, zoom
if __name__ == "__main__": pass