96 lines
2.9 KiB
Python
96 lines
2.9 KiB
Python
#!/usr/bin/env python
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from nose.tools import *
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from utilities import execution_path, save_data, contains_word
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import os, mapnik2
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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_dataraster_coloring():
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srs = '+init=epsg:32630'
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lyr = mapnik2.Layer('dataraster')
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lyr.datasource = mapnik2.Gdal(
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file = '../data/raster/dataraster.tif',
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band = 1,
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)
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lyr.srs = srs
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_map = mapnik2.Map(256,256, srs)
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style = mapnik2.Style()
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rule = mapnik2.Rule()
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sym = mapnik2.RasterSymbolizer()
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# Assigning a colorizer to the RasterSymbolizer tells the later
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# that it should use it to colorize the raw data raster
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sym.colorizer = mapnik2.RasterColorizer(mapnik2.COLORIZER_DISCRETE, mapnik2.Color("transparent"))
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for value, color in [
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( 0, "#0044cc"),
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( 10, "#00cc00"),
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( 20, "#ffff00"),
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( 30, "#ff7f00"),
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( 40, "#ff0000"),
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( 50, "#ff007f"),
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( 60, "#ff00ff"),
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( 70, "#cc00cc"),
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( 80, "#990099"),
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( 90, "#660066"),
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( 200, "transparent"),
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]:
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sym.colorizer.add_stop(value, mapnik2.Color(color))
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rule.symbols.append(sym)
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style.rules.append(rule)
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_map.append_style('foo', style)
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lyr.styles.append('foo')
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_map.layers.append(lyr)
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_map.zoom_to_box(lyr.envelope())
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im = mapnik2.Image(_map.width,_map.height)
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mapnik2.render(_map, im)
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# save a png somewhere so we can see it
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save_data('test_dataraster_coloring.png', im.tostring('png'))
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imdata = im.tostring()
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# we have some values in the [20,30) interval so check that they're colored
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assert contains_word('\xff\xff\x00\xff', imdata)
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def test_dataraster_query_point():
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srs = '+init=epsg:32630'
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lyr = mapnik2.Layer('dataraster')
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lyr.datasource = mapnik2.Gdal(
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file = '../data/raster/dataraster.tif',
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band = 1,
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)
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lyr.srs = srs
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_map = mapnik2.Map(256,256, srs)
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_map.layers.append(lyr)
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# point inside raster extent with valid data
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x, y = 427417, 4477517
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features = _map.query_point(0,x,y).features
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assert len(features) == 1
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feat = features[0]
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center = feat.envelope().center()
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assert center.x==x and center.y==y, center
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value = feat['value']
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assert value == 21.0, value
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# point outside raster extent
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features = _map.query_point(0,-427417,4477517).features
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assert len(features) == 0
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# point inside raster extent with nodata
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features = _map.query_point(0,126850,4596050).features
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assert len(features) == 0
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def test_load_save_map():
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map = mapnik2.Map(256,256)
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in_map = "../data/good_maps/raster_symbolizer.xml"
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mapnik2.load_map(map, in_map)
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out_map = mapnik2.save_map_to_string(map)
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assert 'RasterSymbolizer' in out_map
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assert 'RasterColorizer' in out_map
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assert 'stop' in out_map
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