示例#1
0
    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)
示例#2
0
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)