148 lines
13 KiB
Python
148 lines
13 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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from nose.tools import *
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import os, mapnik
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from utilities import Todo
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try:
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import json
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except ImportError:
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import simplejson
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grid_correct = {"keys": ["", "North West", "North East", "South West", "South East"], "data": {"South East": {"Name": "South East"}, "North East": {"Name": "North East"}, "North West": {"Name": "North West"}, "South West": {"Name": "South West"}}, "grid": [" ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " !!! ### ", " !!!!! ##### ", " !!!!! ##### ", " !!! ### ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " $$$$ %%%% ", " $$$$$ %%%%% ", " $$$$$ %%%%% ", " $$$ %%% ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " "]}
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grid_correct_new = {"keys": ["", "North West", "North East", "South West", "South East"], "data": {"South East": {"Name": "South East"}, "North East": {"Name": "North East"}, "North West": {"Name": "North West"}, "South West": {"Name": "South West"}}, "grid": [" ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " !! ## ", " !!! ### ", " !! ## ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " $$$ %% ", " $$$ %%% ", " $$ %% ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " "]}
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def resolve(grid,x,y):
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""" Resolve the attributes for a given pixel in a grid.
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js version:
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https://github.com/mapbox/mbtiles-spec/blob/master/1.1/utfgrid.md
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spec:
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https://github.com/mapbox/wax/blob/master/control/lib/gridutil.js
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"""
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utf_val = grid['grid'][x][y]
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#http://docs.python.org/library/functions.html#ord
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codepoint = ord(utf_val)
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if (codepoint >= 93):
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codepoint-=1
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if (codepoint >= 35):
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codepoint-=1
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codepoint -= 32
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key = grid['keys'][codepoint]
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return grid['data'].get(key)
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def create_grid_map(width,height):
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places_ds = mapnik.PointDatasource()
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places_ds.add_point(143.10,-38.60,'Name','South East')
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places_ds.add_point(142.48,-38.60,'Name','South West')
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places_ds.add_point(142.48,-38.38,'Name','North West')
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places_ds.add_point(143.10,-38.38,'Name','North East')
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s = mapnik.Style()
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r = mapnik.Rule()
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#symb = mapnik.PointSymbolizer()
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symb = mapnik.MarkersSymbolizer()
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symb.allow_overlap = True
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r.symbols.append(symb)
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label = mapnik.TextSymbolizer(mapnik.Expression('[Name]'),
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'DejaVu Sans Book',
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10,
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mapnik.Color('black')
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)
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label.allow_overlap = True
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label.displacement = (0,-10)
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#r.symbols.append(label)
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s.rules.append(r)
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lyr = mapnik.Layer('Places')
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lyr.datasource = places_ds
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lyr.styles.append('places_labels')
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m = mapnik.Map(width,height)
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m.append_style('places_labels',s)
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m.layers.append(lyr)
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return m
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def test_render_grid():
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""" test old method """
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width,height = 256,256
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m = create_grid_map(width,height)
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ul_lonlat = mapnik.Coord(142.30,-38.20)
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lr_lonlat = mapnik.Coord(143.40,-38.80)
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m.zoom_to_box(mapnik.Box2d(ul_lonlat,lr_lonlat))
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grid = mapnik.render_grid(m,0,key='Name',resolution=4,fields=['Name'])
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eq_(grid,grid_correct)
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eq_(resolve(grid,0,0),None)
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# check every pixel of the nw symbol
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expected = {"Name": "North West"}
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# top row
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eq_(resolve(grid,23,9),expected)
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eq_(resolve(grid,23,10),expected)
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eq_(resolve(grid,23,11),expected)
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# core
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eq_(resolve(grid,24,8),expected)
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eq_(resolve(grid,24,9),expected)
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eq_(resolve(grid,24,10),expected)
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eq_(resolve(grid,24,11),expected)
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eq_(resolve(grid,24,12),expected)
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eq_(resolve(grid,25,8),expected)
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eq_(resolve(grid,25,9),expected)
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eq_(resolve(grid,25,10),expected)
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eq_(resolve(grid,25,11),expected)
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eq_(resolve(grid,25,12),expected)
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# bottom row
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eq_(resolve(grid,26,9),expected)
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eq_(resolve(grid,26,10),expected)
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eq_(resolve(grid,26,11),expected)
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def test_render_grid2():
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""" test old against new"""
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width,height = 256,256
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m = create_grid_map(width,height)
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ul_lonlat = mapnik.Coord(142.30,-38.20)
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lr_lonlat = mapnik.Coord(143.40,-38.80)
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m.zoom_to_box(mapnik.Box2d(ul_lonlat,lr_lonlat))
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# new method
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grid = mapnik.Grid(m.width,m.height,key='Name')
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mapnik.render_layer(m,grid,layer=0,fields=['Name'])
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utf1 = grid.encode('utf',resolution=4)
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eq_(utf1,grid_correct_new)
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# old method - to be removed
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utf2 = mapnik.render_grid(m,0,key='Name',resolution=4,fields=['Name'])
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eq_(utf2,grid_correct)
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# for complex polygons these will not be true
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eq_(len(utf2['grid']),len(utf1['grid']))
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eq_(len(utf2['keys']),len(utf1['keys']))
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eq_(len(utf2['data']),len(utf1['data']))
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# check a full view is the same as a full image
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grid_view = grid.view(0,0,width,height)
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# for kicks check at full res too
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utf3 = grid.encode('utf',resolution=1)
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utf4 = grid_view.encode('utf',resolution=1)
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eq_(utf3['grid'],utf4['grid'])
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eq_(utf3['keys'],utf4['keys'])
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eq_(utf3['data'],utf4['data'])
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eq_(resolve(utf4,0,0),None)
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# resolve some center points in the
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# resampled view
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utf5 = grid_view.encode('utf',resolution=4)
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eq_(resolve(utf5,25,10),{"Name": "North West"})
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eq_(resolve(utf5,25,46),{"Name": "North East"})
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eq_(resolve(utf5,38,10),{"Name": "South West"})
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eq_(resolve(utf5,38,46),{"Name": "South East"})
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if __name__ == "__main__":
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[eval(run)() for run in dir() if 'test_' in run]
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