| """functions useful to convert to/from latitude-longitude coordinates to pixel image coordinates""" | |
| import math | |
| from src import app_logger | |
| from src.utilities.constants import TILE_SIZE | |
| from src.utilities.type_hints import LatLngDict | |
| from src.utilities.type_hints import ImagePixelCoordinates | |
| def _get_latlng2pixel_projection(latlng: LatLngDict) -> ImagePixelCoordinates: | |
| app_logger.debug(f"latlng: {type(latlng)}, value:{latlng}.") | |
| app_logger.debug(f'latlng lat: {type(latlng.lat)}, value:{latlng.lat}.') | |
| app_logger.debug(f'latlng lng: {type(latlng.lng)}, value:{latlng.lng}.') | |
| try: | |
| sin_y: float = math.sin(latlng.lat * math.pi / 180) | |
| app_logger.debug(f"sin_y, #1:{sin_y}.") | |
| sin_y = min(max(sin_y, -0.9999), 0.9999) | |
| app_logger.debug(f"sin_y, #2:{sin_y}.") | |
| x = TILE_SIZE * (0.5 + latlng.lng / 360) | |
| app_logger.debug(f"x:{x}.") | |
| y = TILE_SIZE * (0.5 - math.log((1 + sin_y) / (1 - sin_y)) / (4 * math.pi)) | |
| app_logger.debug(f"y:{y}.") | |
| return {"x": x, "y": y} | |
| except Exception as e_get_latlng2pixel_projection: | |
| app_logger.error(f'e_get_latlng2pixel_projection:{e_get_latlng2pixel_projection}.') | |
| raise e_get_latlng2pixel_projection | |
| def _get_point_latlng_to_pixel_coordinates(latlng: LatLngDict, zoom: int | float) -> ImagePixelCoordinates: | |
| try: | |
| world_coordinate: ImagePixelCoordinates = _get_latlng2pixel_projection(latlng) | |
| app_logger.debug(f"world_coordinate:{world_coordinate}.") | |
| scale: int = pow(2, zoom) | |
| app_logger.debug(f"scale:{scale}.") | |
| return ImagePixelCoordinates( | |
| x=math.floor(world_coordinate["x"] * scale), | |
| y=math.floor(world_coordinate["y"] * scale) | |
| ) | |
| except Exception as e_format_latlng_to_pixel_coordinates: | |
| app_logger.error(f'format_latlng_to_pixel_coordinates:{e_format_latlng_to_pixel_coordinates}.') | |
| raise e_format_latlng_to_pixel_coordinates | |
| def get_latlng_to_pixel_coordinates( | |
| latlng_origin_ne: LatLngDict, | |
| latlng_origin_sw: LatLngDict, | |
| latlng_current_point: LatLngDict, | |
| zoom: int | float, | |
| k: str | |
| ) -> ImagePixelCoordinates: | |
| """ | |
| Parse the input request lambda event. | |
| Args: | |
| latlng_origin_ne: NE latitude-longitude origin point | |
| latlng_origin_sw: SW latitude-longitude origin point | |
| latlng_current_point: latitude-longitude prompt point | |
| zoom: zoom value | |
| k: prompt type | |
| Returns: | |
| ImagePixelCoordinates: pixel image coordinate point | |
| """ | |
| app_logger.debug(f"latlng_origin - {k}: {type(latlng_origin_ne)}, value:{latlng_origin_ne}.") | |
| app_logger.debug(f"latlng_current_point - {k}: {type(latlng_current_point)}, value:{latlng_current_point}.") | |
| latlng_map_origin_ne = _get_point_latlng_to_pixel_coordinates(latlng_origin_ne, zoom) | |
| latlng_map_origin_sw = _get_point_latlng_to_pixel_coordinates(latlng_origin_sw, zoom) | |
| latlng_map_current_point = _get_point_latlng_to_pixel_coordinates(latlng_current_point, zoom) | |
| diff_coord_x = abs(latlng_map_origin_sw["x"] - latlng_map_current_point["x"]) | |
| diff_coord_y = abs(latlng_map_origin_ne["y"] - latlng_map_current_point["y"]) | |
| point = ImagePixelCoordinates(x=diff_coord_x, y=diff_coord_y) | |
| app_logger.debug(f"point type - {k}: {point}.") | |
| return point | |