226 lines
11 KiB
Python
226 lines
11 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 tempfile
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import os, mapnik
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from nose.tools import *
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from utilities import execution_path
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def setup():
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# All of the paths used are relative, if we run the tests
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# from another directory we need to chdir()
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os.chdir(execution_path('.'))
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def test_simplest_render():
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m = mapnik.Map(256, 256)
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i = mapnik.Image(m.width, m.height)
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mapnik.render(m, i)
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s = i.tostring()
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eq_(s, 256 * 256 * '\x00\x00\x00\x00')
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def test_render_image_to_string():
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i = mapnik.Image(256, 256)
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i.background = mapnik.Color('black')
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s = i.tostring()
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eq_(s, 256 * 256 * '\x00\x00\x00\xff')
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s = i.tostring('png')
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def test_setting_alpha():
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w,h = 256,256
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im1 = mapnik.Image(w,h)
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# white, half transparent
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im1.background = mapnik.Color('rgba(255,255,255,.5)')
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# pure white
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im2 = mapnik.Image(w,h)
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im2.background = mapnik.Color('rgba(255,255,255,1)')
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im2.set_alpha(.5)
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eq_(len(im1.tostring()), len(im2.tostring()))
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def test_render_image_to_file():
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i = mapnik.Image(256, 256)
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i.background = mapnik.Color('black')
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if mapnik.has_jpeg():
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i.save('test.jpg')
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i.save('test.png', 'png')
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if os.path.exists('test.jpg'):
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os.remove('test.jpg')
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else:
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return False
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if os.path.exists('test.png'):
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os.remove('test.png')
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else:
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return False
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def get_paired_images(w,h,mapfile):
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tmp_map = 'tmp_map.xml'
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m = mapnik.Map(w,h)
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mapnik.load_map(m,mapfile)
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i = mapnik.Image(w,h)
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m.zoom_all()
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mapnik.render(m,i)
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mapnik.save_map(m,tmp_map)
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m2 = mapnik.Map(w,h)
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mapnik.load_map(m2,tmp_map)
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i2 = mapnik.Image(w,h)
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m2.zoom_all()
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mapnik.render(m2,i2)
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os.remove(tmp_map)
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return i,i2
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def test_render_from_serialization():
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try:
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i,i2 = get_paired_images(100,100,'../data/good_maps/building_symbolizer.xml')
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eq_(i.tostring(),i2.tostring())
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i,i2 = get_paired_images(100,100,'../data/good_maps/polygon_symbolizer.xml')
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eq_(i.tostring(),i2.tostring())
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except RuntimeError, e:
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# only test datasources that we have installed
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if not 'Could not create datasource' in str(e):
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raise RuntimeError(e)
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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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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 test_render_grid():
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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(256,256)
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m.append_style('places_labels',s)
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m.layers.append(lyr)
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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_points():
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if not mapnik.has_cairo(): return
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# create and populate point datasource (WGS84 lat-lon coordinates)
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places_ds = mapnik.PointDatasource()
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places_ds.add_point(142.48,-38.38,'Name','Westernmost Point') # westernmost
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places_ds.add_point(143.10,-38.60,'Name','Southernmost Point') # southernmost
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# create layer/rule/style
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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.allow_overlap = True
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r.symbols.append(symb)
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s.rules.append(r)
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lyr = mapnik.Layer('Places','+proj=latlon +datum=WGS84')
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lyr.datasource = places_ds
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lyr.styles.append('places_labels')
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# latlon bounding box corners
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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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# render for different projections
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projs = {
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'latlon': '+proj=latlon +datum=WGS84',
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'merc': '+proj=merc +datum=WGS84 +k=1.0 +units=m +over +no_defs',
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'google': '+proj=merc +ellps=sphere +R=6378137 +a=6378137 +units=m',
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'utm': '+proj=utm +zone=54 +datum=WGS84'
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}
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for projdescr in projs.iterkeys():
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m = mapnik.Map(1000, 500, projs[projdescr])
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m.append_style('places_labels',s)
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m.layers.append(lyr)
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p = mapnik.Projection(projs[projdescr])
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m.zoom_to_box(p.forward(mapnik.Box2d(ul_lonlat,lr_lonlat)))
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# Render to SVG so that it can be checked how many points are there with string comparison
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svg_file = os.path.join(tempfile.gettempdir(),'%s.svg')
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mapnik.render_to_file(m, svg_file)
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num_points_present = len(places_ds.all_features())
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svg = open(svg_file,'r').read()
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num_points_rendered = svg.count('<image ')
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eq_(num_points_present, num_points_rendered, "Not all points were rendered (%d instead of %d) at projection %s" % (num_points_rendered, num_points_present, projdescr))
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if __name__ == "__main__":
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setup()
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[eval(run)() for run in dir() if 'test_' in run]
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