Python mapnik.load_map函数代码示例

 def test_style_level_comp_op():
     m = mapnik.Map(256, 256)
     mapnik.load_map(m, "../data/good_maps/style_level_comp_op.xml")
     m.zoom_all()
     successes = []
     fails = []
     for name in mapnik.CompositeOp.names:
         # find_style returns a copy of the style object
         style_markers = m.find_style("markers")
         style_markers.comp_op = getattr(mapnik.CompositeOp, name)
         # replace the original style with the modified one
         replace_style(m, "markers", style_markers)
         im = mapnik.Image(m.width, m.height)
         mapnik.render(m, im)
         actual = "/tmp/mapnik-style-comp-op-" + name + ".png"
         expected = "images/style-comp-op/" + name + ".png"
         im.save(actual, "png32")
         if not os.path.exists(expected) or os.environ.get("UPDATE"):
             print "generating expected test image: %s" % expected
             im.save(expected, "png32")
         expected_im = mapnik.Image.open(expected)
         # compare them
         if im.tostring("png32") == expected_im.tostring("png32"):
             successes.append(name)
         else:
             fails.append(
                 "failed comparing actual (%s) and expected(%s)" % (actual, "tests/python_tests/" + expected)
             )
             fail_im = side_by_side_image(expected_im, im)
             fail_im.save("/tmp/mapnik-style-comp-op-" + name + ".fail.png", "png32")
     eq_(len(fails), 0, "\n" + "\n".join(fails))

    def renderTile(self, width, height, srs, coord):
        """
        """
        if self.mapnik is None:
            self.mapnik = mapnik.Map(0, 0)
            mapnik.load_map(self.mapnik, str(self.mapfile))

        nw = self.layer.projection.coordinateLocation(coord)
        se = self.layer.projection.coordinateLocation(coord.right().down())
        ul = self.mercator.locationProj(nw)
        lr = self.mercator.locationProj(se)


        self.mapnik.width = width
        self.mapnik.height = height
        self.mapnik.zoom_to_box(mapnik.Box2d(ul.x, ul.y, lr.x, lr.y))

        # create grid as same size as map/image
        grid = mapnik.Grid(width, height)
        # render a layer to that grid array
        mapnik.render_layer(self.mapnik, grid, layer=self.layer_index, fields=self.fields)
        # then encode the grid array as utf, resample to 1/scale the size, and dump features
        grid_utf = grid.encode('utf', resolution=self.scale, features=True)

        if self.wrapper is None:
            return SaveableResponse(json.dumps(grid_utf))
        else:
            return SaveableResponse(self.wrapper + '(' + json.dumps(grid_utf) + ')')

def test_hit_grid():
    import os
    from itertools import groupby

    def rle_encode(l):
        """ encode a list of strings with run-length compression """
        return ["%d:%s" % (len(list(group)), name) for name, group in groupby(l)]

    m = mapnik.Map(256,256);
    mapnik.load_map(m,'../data/good_maps/agg_poly_gamma_map.xml');
    m.zoom_all()
    join_field = 'NAME'
    fg = [] # feature grid
    for y in range(0, 256, 4):
        for x in range(0, 256, 4):
            featureset = m.query_map_point(0,x,y)
            added = False
            for feature in featureset.features:
                fg.append(feature[join_field])
                added = True
            if not added:
                fg.append('')
    hit_list = '|'.join(rle_encode(fg))
    eq_(hit_list[:16],'730:|2:Greenland')
    eq_(hit_list[-12:],'1:Chile|812:')

def test_render_mvt_merc_nested_layers():
    m = mapnik.Map(512, 512)
    mapnik.load_map(m, '../data-visual/styles/nested-layers-1.xml')
    mvt = mapnik.VectorTileMerc(0, 0, 0)

    im2 = mapnik.Image(m.width, m.height)
    m.zoom_to_box(mvt.extent)
    mapnik.render(m, im2)
    actual2 = 'images/mvt/nested_layers.classic.actual.png'
    expected2 = 'images/mvt/nested_layers.classic.expected.png'
    im2.save(actual2, 'png32')
    eq_(compare_file_size(actual2, expected2, 100), True)

    mvt_buffer = mapnik.create_mvt_merc(m,
        mvt.x, mvt.y, mvt.z)

    # Check number of layers of the MVT
    vti = mapnik.VectorTileInfo()
    vti.parse_from_string(mvt_buffer)
    eq_(vti.layers_size(), 2);

    mapnik.merge_compressed_buffer(mvt, mvt_buffer)

    m = mapnik.Map(512, 512)
    # Load a version of the style with no datasources
    mapnik.load_map(m, 'styles/nested-layers-1.xml')
    im = mapnik.Image(m.width, m.height)
    mapnik.render_mvt_merc(mvt, m, im)

    actual = 'images/mvt/nested_layers.mvt.actual.png'
    im.save(actual, 'png32')
    expected = 'images/mvt/nested_layers.mvt.expected.png'
    eq_(compare_file_size(actual, expected, 100), True)

 def watcher(self):
     failed = 0
     while 1:
         if not self.modified == os.path.getmtime(self._mapfile):
             self._locked = True
             time.sleep(self.watch_interval/2.0)
             self._log.info('Mapfile **changed**, reloading... ')
             try:
                 self._mapnik_map = mapnik.Map(self.size,self.size)
                 if self._mapfile.endswith('.xml'):
                     mapnik.load_map(self._mapnik_map, self._mapfile)
                 elif self._mapfile.endswith('.mml'):
                     from cascadenik import load_map as load_mml
                     load_mml(self._mapnik_map, self._mapfile)
                 self.msg('Mapfile successfully reloaded from %s' % self._mapfile)
                 if not is_merc(self._mapnik_map.srs):
                     self._mapnik_map.srs = MERC_PROJ4
                     self.msg('Map is not in spherical mercator, so setting that projection....')
                 failed = 0
             except Exception, E:
                 failed += 1
                 again = self.watch_interval*2
                 self.msg('Failed to reload mapfile, will try again in %s seconds:\n%s' % (again,E))
                 time.sleep(again)
             self.modified = os.path.getmtime(self._mapfile)
             self._locked = False
         else:
             time.sleep(self.watch_interval)
         if failed > self.max_failures:
             self.msg('Giving up on mapfile change watching thread...')
             break

def render_tile(mapfile, tile_uri, x, y, z):
	m = mapnik.Map(256, 256)

	# Load style XML
	mapnik.load_map(m, mapfile, True)

	# Obtain <Map> projection
	prj = mapnik.Projection(m.srs)

	# Projects between tile pixel co-ordinates and LatLong (EPSG:4326)
	tileproj = GoogleProjection(z+1)

	# Calculate pixel positions of bottom-left & top-right
	p0 = (x * 256, (y + 1) * 256)
	p1 = ((x + 1) * 256, y * 256)

	# Convert to LatLong (EPSG:4326)
	l0 = tileproj.fromPixelToLL(p0, z);
	l1 = tileproj.fromPixelToLL(p1, z);

	# Convert to map projection (e.g. mercator co-ords EPSG:900913)
	c0 = prj.forward(mapnik.Coord(l0[0],l0[1]))
	c1 = prj.forward(mapnik.Coord(l1[0],l1[1]))

	# Bounding box for the tile
	bbox = mapnik.Envelope(c0.x,c0.y, c1.x,c1.y)
	render_size = 256
	m.resize(render_size, render_size)
	m.zoom_to_box(bbox)
	m.buffer_size = 128

	# Render image with default Agg renderer
	im = mapnik.Image(render_size, render_size)
	mapnik.render(m, im)
	im.save(tile_uri, 'png256')

def renderPage(ll,file):

        z = 2
        #imgx = 987 * z
        #imgy = 801 * z
        imgx = int(987 * z )
        imgy = int(987 * z *0.77 )
        m = mapnik.Map(imgx,imgy)
        mapnik.load_map(m,mapfile)
        prj = mapnik.Projection("+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m [email protected] +no_defs +over")
        c0 = prj.forward(mapnik.Coord(ll[0],ll[1]))
        c1 = prj.forward(mapnik.Coord(ll[2],ll[3]))
        if hasattr(mapnik,'mapnik_version') and mapnik.mapnik_version() >= 800:
            bbox = mapnik.Box2d(c0.x,c0.y,c1.x,c1.y)
        else:
            bbox = mapnik.Envelope(c0.x,c0.y,c1.x,c1.y)
            m.zoom_to_box(bbox)
            im = mapnik.Image(imgx,imgy)
            mapnik.render(m, im)
            view = im.view(0,0,imgx,imgy) # x,y,width,height
            map_uri=file + '.png'
            view.save(map_uri,'png')
        
        
            file=open(file+'.svg' ,'w')
            surface=cairo.SVGSurface(file.name,imgx,imgy)
            mapnik.render(m,surface)
            #c = cairo.Context(surface)
            #c.move_to(50,50)
            #c.show_text('testing')

            surface.finish();

    def loop(self):
        
        self.m = mapnik.Map(256, 256)
        # Load style XML
        mapnik.load_map(self.m, self.mapfile, True)
        # Obtain <Map> projection
        self.prj = mapnik.Projection(self.m.srs)
        # Projects between tile pixel co-ordinates and LatLong (EPSG:4326)
        self.tileproj = GoogleProjection(self.maxZoom+1)
                
        while True:
            #Fetch a tile from the queue and render it
            r = self.q.get()
            if (r == None):
                self.q.task_done()
                break
            else:
                (name, tile_uri, x, y, z) = r

            exists= ""
            if os.path.isfile(tile_uri):
                exists= "exists"
            else:
                self.render_tile(tile_uri, x, y, z)
            bytes=os.stat(tile_uri)[6]
            empty= ''
            if bytes == 103:
                empty = " Empty Tile "
            self.printLock.acquire()
            print(name, ":", z, x, y, exists, empty)
            self.printLock.release()
            self.q.task_done()

    def render(self, fmt, width, height, bbox, srs, styles, layers, **kwargs):
        """Render a WMS request or a tile.  TODO - create an SQLite cache for this as well, based on hashed filename."""

        _log.debug('render called for {0}'.format(layers))
        if srs.lower().startswith('epsg'):
            if srs.endswith("900913") or srs.endswith("3857"):
                srs = "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m [email protected]"
            else:
                srs = "+init=" + srs.lower()

        name = self.prepare_wms(layers, srs, styles, **kwargs)
        filename = "{name}.{bbox}.{width}x{height}.{fmt}".format(
            name=name,
            bbox='_'.join(str(b) for b in bbox),
            width=width,
            height=height,
            fmt=fmt
        )

        _log.debug('waiting on lock')
        while os.path.exists(name + ".lock"):
            time.sleep(0.05)

        _log.debug('rendering {0}x{1} tile'.format(width, height))
        m = mapnik.Map(width, height)
        mapnik.load_map(m, (name + '.xml').encode('ascii'))
        m.zoom_to_box(mapnik.Box2d(*bbox))
        mapnik.render_to_file(m, filename, fmt)

        with open(filename) as tiledata:
            tile = buffer(tiledata.read())
        os.unlink(filename)

        return filename, tile

 def generate_img(self):
     print "\n- Render image"
     m = mapnik.Map(600, 300)
     mapnik.load_map(m, self.stylesheet)
     m.zoom_all()
     mapnik.render_to_file(m, self.image)
     print "rendered image to '{0}'".format(self.image)

    def renderTile(self, width, height, srs, coord):
        """
        """
        if self.mapnik is None:
            self.mapnik = mapnik.Map(0, 0)
            mapnik.load_map(self.mapnik, str(self.mapfile))

        # buffer as fraction of tile size
        buffer = float(self.buffer) / 256

        nw = self.layer.projection.coordinateLocation(coord.left(buffer).up(buffer))
        se = self.layer.projection.coordinateLocation(coord.right(1 + buffer).down(1 + buffer))
        ul = self.mercator.locationProj(nw)
        lr = self.mercator.locationProj(se)

        self.mapnik.width = width + 2 * self.buffer
        self.mapnik.height = height + 2 * self.buffer
        self.mapnik.zoom_to_box(mapnik.Box2d(ul.x, ul.y, lr.x, lr.y))

        # create grid as same size as map/image
        grid = mapnik.Grid(width + 2 * self.buffer, height + 2 * self.buffer)
        # render a layer to that grid array
        mapnik.render_layer(self.mapnik, grid, layer=self.layer_index, fields=self.fields)
        # extract a gridview excluding the buffer
        grid_view = grid.view(self.buffer, self.buffer, width, height)
        # then encode the grid array as utf, resample to 1/scale the size, and dump features
        grid_utf = grid_view.encode('utf', resolution=self.scale, add_features=True)

        if self.wrapper is None:
            return SaveableResponse(json.dumps(grid_utf))
        else:
            return SaveableResponse(self.wrapper + '(' + json.dumps(grid_utf) + ')')

    def test_render_with_palette():
        m = mapnik.Map(600, 400)
        mapnik.load_map(m, '../data/good_maps/agg_poly_gamma_map.xml')
        m.zoom_all()
        im = mapnik.Image(m.width, m.height)
        mapnik.render(m, im)
        with open('../data/palettes/palette256.act', 'rb') as act:
            palette = mapnik.Palette(act.read(), 'act')
        # test saving directly to filesystem
        im.save('/tmp/mapnik-palette-test.png', 'png', palette)
        expected = './images/support/mapnik-palette-test.png'
        if os.environ.get('UPDATE'):
            im.save(expected, "png", palette)

        # test saving to a string
        with open('/tmp/mapnik-palette-test2.png', 'wb') as f:
            f.write(im.tostring('png', palette))
        # compare the two methods
        eq_(mapnik.Image.open('/tmp/mapnik-palette-test.png').tostring('png32'),
            mapnik.Image.open(
                '/tmp/mapnik-palette-test2.png').tostring('png32'),
            '%s not eq to %s' % ('/tmp/mapnik-palette-test.png',
                                 '/tmp/mapnik-palette-test2.png'))
        # compare to expected
        eq_(mapnik.Image.open('/tmp/mapnik-palette-test.png').tostring('png32'),
            mapnik.Image.open(expected).tostring('png32'),
            '%s not eq to %s' % ('/tmp/mapnik-palette-test.png',
                                 expected))

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 _init_mapnik(self, projection):
     projection = '+init=%s' % projection.lower()
     mapper = mapnik.Map(32, 32, projection)
     mapnik.load_map(mapper, self._theme)
     self._proj = mapnik.Projection(projection)
     mapper.buffer_size = self._buffer_size
     return mapper

 def test_mapnik(self):
     m = mapnik.Map(600, 300)
     mapnik.load_map(m, 'style_sheet.xml')
     m.zoom_all()
     mapnik.render_to_file(m, actual_image)
     with open(actual_image) as actual, open(expected_image) as expected:
         self.assertEquals(actual.read(), expected.read())