def tile(request, layername, z, x, y):
x = int(x)
y = int(y)
z = int(z)
try:
layer = Layer.objects.get(name=layername)
except ObjectDoesNotExist:
msg = 'No layer found for %s' % layername
logger.debug(msg)
raise Http404(msg)
try:
qgis_layer = QGISServerLayer.objects.get(layer=layer)
except ObjectDoesNotExist:
msg = 'No QGIS Server Layer for existing layer %s' % layername
logger.debug(msg)
raise Http404(msg)
basename, _ = os.path.splitext(qgis_layer.base_layer_path)
tile_path = QGIS_SERVER_CONFIG['tile_path']
tile_filename = tile_path % (os.path.basename(basename), z, x, y)
if not os.path.exists(tile_filename):
if not os.path.exists(os.path.dirname(tile_filename)):
os.makedirs(os.path.dirname(tile_filename))
# Call the WMS
top, left = num2deg(x, y, z)
bottom, right = num2deg(x + 1, y + 1, z)
transform = CoordTransform(SpatialReference(4326),
SpatialReference(3857))
top_left_corner = Point(left, top, srid=4326)
bottom_right_corner = Point(right, bottom, srid=4326)
top_left_corner.transform(transform)
bottom_right_corner.transform(transform)
bottom = bottom_right_corner.y
right = bottom_right_corner.x
top = top_left_corner.y
left = top_left_corner.x
bbox = ','.join([str(val) for val in [left, bottom, right, top]])
qgis_server = QGIS_SERVER_CONFIG['qgis_server_url']
query_string = {
'SERVICE': 'WMS',
'VERSION': '1.3.0',
'REQUEST': 'GetMap',
'BBOX': bbox,
'CRS': 'EPSG:3857',
'WIDTH': '256',
'HEIGHT': '256',
'MAP': qgis_layer.base_layer_path,
'LAYERS': layer.name,
'STYLES': 'default',
'FORMAT': 'image/png',
'TRANSPARENT': 'true',
'DPI': '96',
'MAP_RESOLUTION': '96',
'FORMAT_OPTIONS': 'dpi:96'
}
url = qgis_server + '?'
for param, value in query_string.iteritems():
url += param + '=' + value + '&'
urlretrieve(url, tile_filename)
if image_format(tile_filename) != 'png':
logger.error('%s is not valid PNG.' % tile_filename)
os.remove(tile_filename)
if not os.path.exists(tile_filename):
return HttpResponse('The legend could not be found.', status=409)
with open(tile_filename, 'rb') as f:
return HttpResponse(f.read(), mimetype='image/png')
def tile_url(layer, z, x, y, style=None, internal=True):
"""Construct actual tile request to QGIS Server.
Different than tile_url_format, this method will return url for requesting
a tile, with all parameters filled out.
:param layer: Layer to use
:type layer: Layer
:param z: TMS coordinate, zoom parameter
:type z: int, str
:param x: TMS coordinate, longitude parameter
:type x: int, str
:param y: TMS coordinate, latitude parameter
:type y: int, str
:param style: Layer style to choose
:type style: str
:param internal: Flag to switch between public url and internal url.
Public url will be served by Django Geonode (proxified).
:type internal: bool
:return: Tile url
:rtype: str
"""
try:
qgis_layer = QGISServerLayer.objects.get(layer=layer)
except QGISServerLayer.DoesNotExist:
msg = 'No QGIS Server Layer for existing layer {0}'.format(layer.name)
logger.debug(msg)
raise
x = int(x)
y = int(y)
z = int(z)
# Call the WMS
top, left = num2deg(x, y, z)
bottom, right = num2deg(x + 1, y + 1, z)
transform = CoordTransform(SpatialReference(4326), SpatialReference(3857))
top_left_corner = Point(left, top, srid=4326)
bottom_right_corner = Point(right, bottom, srid=4326)
top_left_corner.transform(transform)
bottom_right_corner.transform(transform)
bottom = bottom_right_corner.y
right = bottom_right_corner.x
top = top_left_corner.y
left = top_left_corner.x
bbox = ','.join([str(val) for val in [left, bottom, right, top]])
if not style:
style = 'default'
if style not in [s.name for s in qgis_layer.styles.all()]:
style = qgis_layer.default_style.name
query_string = {
'SERVICE': 'WMS',
'VERSION': '1.3.0',
'REQUEST': 'GetMap',
'BBOX': bbox,
'CRS': 'EPSG:3857',
'WIDTH': '256',
'HEIGHT': '256',
'MAP': qgis_layer.qgis_project_path,
'LAYERS': layer.name,
'STYLE': style,
'FORMAT': 'image/png',
'TRANSPARENT': 'true',
'DPI': '96',
'MAP_RESOLUTION': '96',
'FORMAT_OPTIONS': 'dpi:96'
}
qgis_server_url = qgis_server_endpoint(internal)
url = Request('GET', qgis_server_url, params=query_string).prepare().url
return url
def tile_url(layer, z, x, y, style=None, internal=True):
"""Construct actual tile request to QGIS Server.
Different than tile_url_format, this method will return url for requesting
a tile, with all parameters filled out.
:param layer: Layer to use
:type layer: Layer
:param z: TMS coordinate, zoom parameter
:type z: int, str
:param x: TMS coordinate, longitude parameter
:type x: int, str
:param y: TMS coordinate, latitude parameter
:type y: int, str
:param style: Layer style to choose
:type style: str
:param internal: Flag to switch between public url and internal url.
Public url will be served by Django Geonode (proxified).
:type internal: bool
:return: Tile url
:rtype: str
"""
try:
qgis_layer = QGISServerLayer.objects.get(layer=layer)
except QGISServerLayer.DoesNotExist:
msg = 'No QGIS Server Layer for existing layer {0}'.format(
layer.name)
logger.debug(msg)
raise
x = int(x)
y = int(y)
z = int(z)
# Call the WMS
top, left = num2deg(x, y, z)
bottom, right = num2deg(x + 1, y + 1, z)
transform = CoordTransform(SpatialReference(4326), SpatialReference(3857))
top_left_corner = Point(left, top, srid=4326)
bottom_right_corner = Point(right, bottom, srid=4326)
top_left_corner.transform(transform)
bottom_right_corner.transform(transform)
bottom = bottom_right_corner.y
right = bottom_right_corner.x
top = top_left_corner.y
left = top_left_corner.x
bbox = ','.join([str(val) for val in [left, bottom, right, top]])
if not style:
style = 'default'
if style not in [s.name for s in qgis_layer.styles.all()]:
style = qgis_layer.default_style.name
query_string = {
'SERVICE': 'WMS',
'VERSION': '1.3.0',
'REQUEST': 'GetMap',
'BBOX': bbox,
'CRS': 'EPSG:3857',
'WIDTH': '256',
'HEIGHT': '256',
'MAP': qgis_layer.qgis_project_path,
'LAYERS': layer.name,
'STYLE': style,
'FORMAT': 'image/png',
'TRANSPARENT': 'true',
'DPI': '96',
'MAP_RESOLUTION': '96',
'FORMAT_OPTIONS': 'dpi:96'
}
qgis_server_url = qgis_server_endpoint(internal)
url = Request('GET', qgis_server_url, params=query_string).prepare().url
return url