#!/usr/bin/env python # -*- coding: utf-8 -*- from nose.tools import * import os, mapnik try: import json except ImportError: import simplejson 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": [" ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " !!! ### ", " !!!!! ##### ", " !!!!! ##### ", " !!! ### ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " $$$$ %%%% ", " $$$$$ %%%%% ", " $$$$$ %%%%% ", " $$$ %%% ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " "]} 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": [" ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " !! ## ", " !!! ### ", " !! ## ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " $$$ %% ", " $$$ %%% ", " $$ %% ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " "]} def resolve(grid,x,y): """ Resolve the attributes for a given pixel in a grid. js version: https://github.com/mapbox/mbtiles-spec/blob/master/1.1/utfgrid.md spec: https://github.com/mapbox/wax/blob/master/control/lib/gridutil.js """ utf_val = grid['grid'][x][y] #http://docs.python.org/library/functions.html#ord codepoint = ord(utf_val) if (codepoint >= 93): codepoint-=1 if (codepoint >= 35): codepoint-=1 codepoint -= 32 key = grid['keys'][codepoint] return grid['data'].get(key) def create_grid_map(width,height): ds = mapnik.MemoryDatasource() context = mapnik.Context() context.push('Name') f = mapnik.Feature(context,1) f['Name'] = 'South East' f.add_geometries_from_wkt('POINT (143.10 -38.60)') ds.add_feature(f) f = mapnik.Feature(context,2) f['Name'] = 'South West' f.add_geometries_from_wkt('POINT (142.48 -38.60)') ds.add_feature(f) f = mapnik.Feature(context,3) f['Name'] = 'North West' f.add_geometries_from_wkt('POINT (142.48 -38.38)') ds.add_feature(f) f = mapnik.Feature(context,4) f['Name'] = 'North East' f.add_geometries_from_wkt('POINT (143.10 -38.38)') ds.add_feature(f) s = mapnik.Style() r = mapnik.Rule() #symb = mapnik.PointSymbolizer() symb = mapnik.MarkersSymbolizer() symb.allow_overlap = True r.symbols.append(symb) label = mapnik.TextSymbolizer(mapnik.Expression('[Name]'), 'DejaVu Sans Book', 10, mapnik.Color('black') ) label.allow_overlap = True label.displacement = (0,-10) #r.symbols.append(label) s.rules.append(r) lyr = mapnik.Layer('Places') lyr.datasource = ds lyr.styles.append('places_labels') m = mapnik.Map(width,height) m.append_style('places_labels',s) m.layers.append(lyr) return m def test_render_grid(): """ test old method """ width,height = 256,256 m = create_grid_map(width,height) ul_lonlat = mapnik.Coord(142.30,-38.20) lr_lonlat = mapnik.Coord(143.40,-38.80) m.zoom_to_box(mapnik.Box2d(ul_lonlat,lr_lonlat)) grid = mapnik.render_grid(m,0,key='Name',resolution=4,fields=['Name']) eq_(grid,grid_correct) eq_(resolve(grid,0,0),None) # check every pixel of the nw symbol expected = {"Name": "North West"} # top row eq_(resolve(grid,23,9),expected) eq_(resolve(grid,23,10),expected) eq_(resolve(grid,23,11),expected) # core eq_(resolve(grid,24,8),expected) eq_(resolve(grid,24,9),expected) eq_(resolve(grid,24,10),expected) eq_(resolve(grid,24,11),expected) eq_(resolve(grid,24,12),expected) eq_(resolve(grid,25,8),expected) eq_(resolve(grid,25,9),expected) eq_(resolve(grid,25,10),expected) eq_(resolve(grid,25,11),expected) eq_(resolve(grid,25,12),expected) # bottom row eq_(resolve(grid,26,9),expected) eq_(resolve(grid,26,10),expected) eq_(resolve(grid,26,11),expected) def test_render_grid2(): """ test old against new""" width,height = 256,256 m = create_grid_map(width,height) ul_lonlat = mapnik.Coord(142.30,-38.20) lr_lonlat = mapnik.Coord(143.40,-38.80) m.zoom_to_box(mapnik.Box2d(ul_lonlat,lr_lonlat)) # new method grid = mapnik.Grid(m.width,m.height,key='Name') mapnik.render_layer(m,grid,layer=0,fields=['Name']) utf1 = grid.encode('utf',resolution=4) eq_(utf1,grid_correct_new) # old method - to be removed utf2 = mapnik.render_grid(m,0,key='Name',resolution=4,fields=['Name']) eq_(utf2,grid_correct) # for complex polygons these will not be true eq_(len(utf2['grid']),len(utf1['grid'])) eq_(len(utf2['keys']),len(utf1['keys'])) eq_(len(utf2['data']),len(utf1['data'])) # check a full view is the same as a full image grid_view = grid.view(0,0,width,height) # for kicks check at full res too utf3 = grid.encode('utf',resolution=1) utf4 = grid_view.encode('utf',resolution=1) eq_(utf3['grid'],utf4['grid']) eq_(utf3['keys'],utf4['keys']) eq_(utf3['data'],utf4['data']) eq_(resolve(utf4,0,0),None) # resolve some center points in the # resampled view utf5 = grid_view.encode('utf',resolution=4) eq_(resolve(utf5,25,10),{"Name": "North West"}) eq_(resolve(utf5,25,46),{"Name": "North East"}) eq_(resolve(utf5,38,10),{"Name": "South West"}) eq_(resolve(utf5,38,46),{"Name": "South East"}) if __name__ == "__main__": [eval(run)() for run in dir() if 'test_' in run]