Python mapnik.load_map_from_string函数代码示例

def test_arbitrary_parameters_attached_to_map():
    m = mapnik.Map(256,256)
    mapnik.load_map(m,'../data/good_maps/extra_arbitary_map_parameters.xml')
    eq_(len(m.parameters),5)
    eq_(m.parameters['key'],'value2')
    eq_(m.parameters['key3'],'value3')
    eq_(m.parameters['unicode'],u'iván')
    eq_(m.parameters['integer'],10)
    eq_(m.parameters['decimal'],.999)
    m2 = mapnik.Map(256,256)
    for k,v in m.parameters:
        m2.parameters.append(mapnik.Parameter(k,v))
    eq_(len(m2.parameters),5)
    eq_(m2.parameters['key'],'value2')
    eq_(m2.parameters['key3'],'value3')
    eq_(m2.parameters['unicode'],u'iván')
    eq_(m2.parameters['integer'],10)
    eq_(m2.parameters['decimal'],.999)
    map_string = mapnik.save_map_to_string(m)
    m3 = mapnik.Map(256,256)
    mapnik.load_map_from_string(m3,map_string)
    eq_(len(m3.parameters),5)
    eq_(m3.parameters['key'],'value2')
    eq_(m3.parameters['key3'],'value3')
    eq_(m3.parameters['unicode'],u'iván')
    eq_(m3.parameters['integer'],10)
    eq_(m3.parameters['decimal'],.999)

def test_arbitrary_parameters_attached_to_map():
    m = mapnik.Map(256, 256)
    mapnik.load_map(m, "../data/good_maps/extra_arbitary_map_parameters.xml")
    eq_(len(m.parameters), 5)
    eq_(m.parameters["key"], "value2")
    eq_(m.parameters["key3"], "value3")
    eq_(m.parameters["unicode"], u"iván")
    eq_(m.parameters["integer"], 10)
    eq_(m.parameters["decimal"], 0.999)
    m2 = mapnik.Map(256, 256)
    for k, v in m.parameters:
        m2.parameters.append(mapnik.Parameter(k, v))
    eq_(len(m2.parameters), 5)
    eq_(m2.parameters["key"], "value2")
    eq_(m2.parameters["key3"], "value3")
    eq_(m2.parameters["unicode"], u"iván")
    eq_(m2.parameters["integer"], 10)
    eq_(m2.parameters["decimal"], 0.999)
    map_string = mapnik.save_map_to_string(m)
    m3 = mapnik.Map(256, 256)
    mapnik.load_map_from_string(m3, map_string)
    eq_(len(m3.parameters), 5)
    eq_(m3.parameters["key"], "value2")
    eq_(m3.parameters["key3"], "value3")
    eq_(m3.parameters["unicode"], u"iván")
    eq_(m3.parameters["integer"], 10)
    eq_(m3.parameters["decimal"], 0.999)

def test_can_parse_xml_with_deprecated_properties():
    default_logging_severity = mapnik.logger.get_severity()
    mapnik.logger.set_severity(getattr(mapnik.severity_type, "None"))
    files_with_deprecated_props = glob.glob("../data/deprecated_maps/*.xml")

    failures = []
    for filename in files_with_deprecated_props:
        try:
            m = mapnik.Map(512, 512)
            strict = True
            mapnik.load_map(m, filename, strict)
            base_path = os.path.dirname(filename)
            mapnik.load_map_from_string(
                m,
                open(
                    filename,
                    'rb').read(),
                strict,
                base_path)
        except RuntimeError as e:
            # only test datasources that we have installed
            if not 'Could not create datasource' in str(e) \
               and not 'could not connect' in str(e):
                failures.append(
                    'Failed to load valid map %s (%s)' %
                    (filename, e))
    eq_(len(failures), 0, '\n' + '\n'.join(failures))
    mapnik.logger.set_severity(default_logging_severity)

def test_adding_datasource_to_layer():
    map_string = """<?xml version="1.0" encoding="utf-8"?>
<Map>

    <Layer name="world_borders">
        <StyleName>world_borders_style</StyleName>
        <StyleName>point_style</StyleName>
        <!-- leave datasource empty -->
        <!--
        <Datasource>
            <Parameter name="file">../data/shp/world_merc.shp</Parameter>
            <Parameter name="type">shape</Parameter>
        </Datasource>
        -->
    </Layer>

</Map>
"""
    m = mapnik.Map(256, 256)

    try:
        mapnik.load_map_from_string(m, map_string)

        # validate it loaded fine
        eq_(m.layers[0].styles[0], "world_borders_style")
        eq_(m.layers[0].styles[1], "point_style")
        eq_(len(m.layers), 1)

        # also assign a variable reference to that layer
        # below we will test that this variable references
        # the same object that is attached to the map
        lyr = m.layers[0]

        # ensure that there was no datasource for the layer...
        eq_(m.layers[0].datasource, None)
        eq_(lyr.datasource, None)

        # also note that since the srs was black it defaulted to wgs84
        eq_(m.layers[0].srs, "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
        eq_(lyr.srs, "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")

        # now add a datasource one...
        ds = mapnik.Shapefile(file="../data/shp/world_merc.shp")
        m.layers[0].datasource = ds

        # now ensure it is attached
        eq_(m.layers[0].datasource.describe()["name"], "shape")
        eq_(lyr.datasource.describe()["name"], "shape")

        # and since we have now added a shapefile in spherical mercator, adjust the projection
        lyr.srs = "+proj=merc +lon_0=0 +lat_ts=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"

        # test that assignment
        eq_(m.layers[0].srs, "+proj=merc +lon_0=0 +lat_ts=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs")
        eq_(lyr.srs, "+proj=merc +lon_0=0 +lat_ts=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs")
    except RuntimeError, e:
        # only test datasources that we have installed
        if not "Could not create datasource" in str(e):
            raise RuntimeError(e)

 def setMapXML_(self, xml):
     map = mapnik.Map(256,256)
     mapnik.load_map_from_string(map, xml)
     self.projectionString = map.srs
     self.projection = mapnik.Projection(self.projectionString)
     
     self.cache = dict()
     self.render_thread.loadMapString_(xml)

def test_serializing_arbitrary_parameters():
    m = mapnik.Map(256,256)
    m.parameters.append(mapnik.Parameter('width',m.width))
    m.parameters.append(mapnik.Parameter('height',m.height))

    m2 = mapnik.Map(1,1)
    mapnik.load_map_from_string(m2,mapnik.save_map_to_string(m))
    eq_(m2.parameters['width'],m.width)
    eq_(m2.parameters['height'],m.height)

 def loadMapString_(self, xml):
     self.cancelTiles()
     
     self.map_lock.lock()
     self.map = mapnik.Map(256,256)
     self.map.buffer_size = 128
     mapnik.load_map_from_string(self.map, xml)
     self.prj = mapnik.Projection(self.map.srs)
     self.map_lock.unlock()

def assert_loads_successfully(file):
    m = mapnik.Map(512, 512)

    strict = True
    mapnik.load_map(m, file, strict)
    
    # libxml2 is not smart about paths, and clips the last directory off
    # of a path if it does not end in a trailing slash
    base_path = os.path.dirname(file) + '/'
    mapnik.load_map_from_string(m,open(file,'rb').read(),strict,base_path)

def create_thumbnail(xmlmap, filepath):
    shape = (230, 200)
    m = mapnik.Map(*shape)
    mapnik.load_map_from_string(m, xmlmap)
    box = m.layers[0].envelope()
    prj = mapnik.Projection(m.srs)
    prj_box = box.forward(prj)
    m.zoom_to_box(prj_box)
    im = mapnik.Image(*shape)
    mapnik.render(m, im)
    im.save(filepath, 'png256')

def test_filter_init():
    m = mapnik.Map(1, 1)
    mapnik.load_map_from_string(m, map_)
    filters = []
    filters.append(mapnik.Filter("([region]>=0) and ([region]<=50)"))
    filters.append(mapnik.Filter("(([region]>=0) and ([region]<=50))"))
    filters.append(mapnik.Filter("((([region]>=0) and ([region]<=50)))"))
    filters.append(mapnik.Filter("((([region]>=0) and ([region]<=50)))"))
    filters.append(mapnik.Filter("""((([region]>=0) and ([region]<=50)))"""))
    filters.append(
        mapnik.Filter(
            """
    ((([region]>=0)
    and
    ([region]<=50)))
    """
        )
    )
    filters.append(
        mapnik.Filter(
            """
    ([region]>=0)
    and
    ([region]<=50)
    """
        )
    )
    filters.append(
        mapnik.Filter(
            """
    ([region]
    >=
    0)
    and
    ([region]
    <= 
    50)
    """
        )
    )

    s = m.find_style("s")

    for r in s.rules:
        filters.append(r.filter)

    first = filters[0]
    for f in filters:
        eq_(str(first), str(f))

    s = m.find_style("s2")

    eq_(s.filter_mode, mapnik.filter_mode.FIRST)

def render_png(tile, zoom, xml, overscan):
    map_tile_size = TILE_SIZE + (overscan * 2)
    # mapnik is installed in a non-standard way.
    # It confuses pylint.
    # pylint: disable=no-member
    """
    Render the tile for the given zoom
    """
    logger = get_logger()
    ctx = mapnik.Context()

    map_tile = mapnik.Map(map_tile_size, map_tile_size)
    # scale_denom = 1 << (BASE_ZOOM - int(zoom or 1))
    # scale_factor = scale_denom / map_tile.scale_denominator()
    # map_tile.zoom(scale_factor)  # Is overriden by zoom_to_box.

    mapnik.load_map_from_string(map_tile, xml)

    box_min = -overscan
    box_max = TILE_SIZE + overscan - 1
    map_tile.zoom_to_box(mapnik.Box2d(box_min, box_min, box_max, box_max))

    for (name, features) in tile.items():
        name = name.encode('ascii', 'ignore')
        source = mapnik.MemoryDatasource()
        map_layer = mapnik.Layer(name)
        map_layer.datasource = source

        for feature in features:
            feat = mapnik.Feature(ctx, 0)

            try:
                feat.add_geometries_from_wkb(feature)
            except RuntimeError:
                from mapnik import Path  # pylint: disable=no-name-in-module
                try:
                    wkt = Path.from_wkb(feature).to_wkt()
                    logger.error('Invalid feature: %s', wkt)
                except RuntimeError:
                    logger.error('Corrupt feature: %s', feature.encode('hex'))

            source.add_feature(feat)

        map_layer.styles.append(name)
        map_tile.layers.append(map_layer)

    image = mapnik.Image(TILE_SIZE, TILE_SIZE)
    # tile, image, scale, offset_x, offset_y
    mapnik.render(map_tile, image, 1, overscan, overscan)

    return image.tostring('png')

def assert_loads_successfully(file):
    m = mapnik.Map(512, 512)

    try:
        strict = True
        mapnik.load_map(m, file, strict)

        # libxml2 is not smart about paths, and clips the last directory off
        # of a path if it does not end in a trailing slash
        base_path = os.path.dirname(file) + '/'
        mapnik.load_map_from_string(m,open(file,'rb').read(),strict,base_path)
    except RuntimeError, e:
        # only test datasources that we have installed
        if not 'Could not create datasource' in str(e):
            raise RuntimeError(e)

def test_good_files():
    good_files = glob.glob("../data/good_maps/*.xml")

    failures = [];
    for filename in good_files:
        try:
            m = mapnik.Map(512, 512)
            strict = True
            mapnik.load_map(m, filename, strict)
            base_path = os.path.dirname(filename)
            mapnik.load_map_from_string(m,open(filename,'rb').read(),strict,base_path)
        except RuntimeError, e:
            # only test datasources that we have installed
            if not 'Could not create datasource' in str(e):
                failures.append('Failed to load valid map (%s)!' % filename)

def test_load_save_load_map():
    map = mapnik.Map(256,256)
    in_map = "../data/good_maps/glyph_symbolizer.xml"
    mapnik.load_map(map, in_map)
    style = map.find_style('arrows')
    sym = style.rules[0].symbols[0]
    assert isinstance(sym, mapnik.GlyphSymbolizer)
    assert sym.angle_mode == mapnik.angle_mode.AZIMUTH

    out_map = mapnik.save_map_to_string(map).decode('utf8')
    map = mapnik.Map(256,256)
    mapnik.load_map_from_string(map, out_map.encode('utf8'))
    assert 'GlyphSymbolizer' in out_map
    # make sure non-ascii characters are well supported since most interesting
    # glyphs for symbology are usually in that range
    assert u'í' in out_map, out_map

    def __init__(self, tile_dir, xmlmap, q, printLock, maxZoom, fields=None, layer_id=None):
        self.tile_dir = tile_dir
        self.q = q
        self.render_size = 256
        self.m = mapnik.Map(self.render_size, self.render_size)
        self.g = mapnik.Grid(self.render_size, self.render_size)
        self.printLock = printLock
        # Load style XML
        mapnik.load_map_from_string(self.m, xmlmap)
        # Obtain <Map> projection
        self.prj = mapnik.Projection(self.m.srs)
        # Projects between tile pixel co-ordinates and LatLong (EPSG:4326)
        self.tileproj = GoogleProjection(maxZoom+1)

        self.layer_id = layer_id
        self.fields = fields or []