def __init__(self, **kwargs):
super().__init__(**kwargs)
layers = OrderedDict()
for raster_layer in RasterAggregatedLayer.objects.order_by("id"):
if raster_layer.legend is not None:
# Only add layers with defined legends
# --> raster tiles cannot be created without a color scheme, a legend is necessary for tile generation!
DataModel = raster_layer.get_data_model()
qs = DataModel.objects.filter(layer=raster_layer)
layers[str(raster_layer.id)] = {
"pixel_size": raster_layer.pixel_size_meters, # currently hard-coded in measurements.management.commands.load_safecast_csv
"point_position": "upperleft",
"model_queryset": qs,
"model_point_fieldname": "location",
"model_value_fieldname": raster_layer.value_fieldname,
"round_pixels": False,
"legend_instance": raster_layer.legend, # object with '.get_color_str()' method that returns an rgb() or hsl() color string.
}
else:
logger.warn("RasterAggregatedLayer: {} has no legend defined!".format(str(raster_layer)))
self.tilemgr = DjangoRasterTileLayerManager(layers)
class RasterLayersTileView(View):
def __init__(self, **kwargs):
super().__init__(**kwargs)
layers = OrderedDict()
for raster_layer in RasterAggregatedLayer.objects.order_by("id"):
if raster_layer.legend is not None:
# Only add layers with defined legends
# --> raster tiles cannot be created without a color scheme, a legend is necessary for tile generation!
DataModel = raster_layer.get_data_model()
qs = DataModel.objects.filter(layer=raster_layer)
layers[str(raster_layer.id)] = {
"pixel_size": raster_layer.pixel_size_meters, # currently hard-coded in measurements.management.commands.load_safecast_csv
"point_position": "upperleft",
"model_queryset": qs,
"model_point_fieldname": "location",
"model_value_fieldname": raster_layer.value_fieldname,
"round_pixels": False,
"legend_instance": raster_layer.legend, # object with '.get_color_str()' method that returns an rgb() or hsl() color string.
}
else:
logger.warn("RasterAggregatedLayer: {} has no legend defined!".format(str(raster_layer)))
self.tilemgr = DjangoRasterTileLayerManager(layers)
def get(self, request):
layername, zoom, x, y, image_format = self.tilemgr.parse_url(request.path)
logger.info("layername({}) zoom({}) x({}) y({}) image_format({})".format(layername, zoom, x, y, image_format))
try:
mimetype, tile_pil_img_object = self.tilemgr.get_tile(layername, zoom, x, y)
except LayerNotConfigured:
return HttpResponseBadRequest("Requested RasterLayer({}) Does Not Exist!".format(layername))
image_encoding = image_format.replace(".", "")
# pillow tile_pil_img_object.tobytes() doesn't seem to work, workaround to serve raw bytes via BytesIO()
image_fileio = BytesIO()
tile_pil_img_object.save(image_fileio, image_encoding)
image_fileio.seek(0)
return HttpResponse(image_fileio, content_type=mimetype)
