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widget.py
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widget.py
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"""Map widget"""
import itertools
import math
from pathlib import Path
import dearpygui.dearpygui as dpg
from dearpygui_map.geo import point_to_xy
from dearpygui_map.io import TileHandler
from dearpygui_map.tile_source import TileServer, TileSpec
class MapWidget:
"""Map widget for Dear PyGui"""
def __init__(
self,
width: int,
height: int,
center: tuple[float, float],
zoom_level: int,
tile_server: TileServer,
):
"""Initialize map widget
Args:
width (int): widget width
height (int): widget height
"""
self.width = width
self.height = height
self.tile_manager = TileManager(
width=width,
height=height,
center=center,
zoom_level=zoom_level,
tile_server=tile_server,
)
self.widget: int | str = None
self.global_handler: int | str = None
self._left_mouse_pressed: bool = False
def __enter__(self) -> int | str:
"""Enter context manager
Returns:
int | str: Dear PyGui drawlist, with map content
"""
with dpg.handler_registry() as self.global_handler:
dpg.add_mouse_click_handler(callback=self._mouse_click_cb)
dpg.add_mouse_drag_handler(callback=self._mouse_drag_cb)
dpg.add_mouse_release_handler(callback=self._mouse_release_cb)
with dpg.drawlist(width=self.width, height=self.height) as self.widget:
dpg.draw_rectangle((0, 0), (self.width, self.height))
self.tile_manager.add_tile_layer()
dpg.push_container_stack(self.widget)
self.tile_manager.update_tile_layer()
return self.widget
def __exit__(self, exc_type, exc_value, exc_tb):
"""Exit context manager
Args:
exc_type (_type_): _description_
exc_value (_type_): _description_
exc_tb (_type_): _description_
"""
del exc_type, exc_value, exc_tb # unused
dpg.pop_container_stack()
def _mouse_click_cb(self, sender: int | str, app_data: int) -> None:
"""Callback on mouse click"""
if dpg.is_item_left_clicked(self.widget):
self._left_mouse_pressed = True
def _mouse_release_cb(self, sender: int | str, app_data: int) -> None:
"""Callback on mouse release"""
self._left_mouse_pressed = False
self.tile_manager.finish_drag()
def _mouse_drag_cb(self, sender: int | str, app_data: list[int | float]) -> None:
"""Callback on mouse drag"""
_, delta_x, delta_y = app_data
if self._left_mouse_pressed:
self.tile_manager.drag_layer(delta_x, delta_y)
class TileManager:
"""Tile manager for MapWidget"""
def __init__(
self,
width: int,
height: int,
center: tuple[float, float],
zoom_level: int,
tile_server: TileServer,
) -> None:
self.viewport_size = width, height
self.zoom_level = zoom_level
self.tile_server = tile_server
self.layer_extent_pixels: tuple[tuple[int, int], tuple[int, int]] = None
self.tile_draw_node_id: int | str = None
self.tiles: list[TileSpec] = []
self.last_drag: tuple[float, float] = (0.0, 0.0)
self.origin_offset = (0, 0)
self.center_point(center, zoom_level)
def center_point(self, center: tuple[float, float], zoom_level: int):
"""Center point on widget
Set self.zoom_level and self.origin_offset
Args:
center (tuple[float, float]): Center point: latitude, longitude
zoom_level (int): Zoom level
"""
center_xy = point_to_xy(center[0], center[1], zoom_level)
self.zoom_level = zoom_level
self.origin_offset: tuple[float, float] = tuple(
-center_xy[i] * self.tile_server.tile_size[i]
+ self.viewport_size[i] / 2
+ self.last_drag[i]
for i in range(2)
)
def add_tile_layer(self):
"""Add Dear PyGui draw layer for map tiles"""
tile_layer = dpg.add_draw_layer(label="tiles")
self.tile_draw_node_id = dpg.add_draw_node(parent=tile_layer)
def update_tile_layer(self):
"""Update tile layer, if there are too few tiles displayed"""
dpg.apply_transform(
self.tile_draw_node_id,
dpg.create_translation_matrix(
[sum(i) for i in zip(self.origin_offset, self.last_drag)]
),
)
if (
self.layer_extent_pixels is not None
and self.layer_extent_pixels[0][0] + self.last_drag[0] < 0
and self.layer_extent_pixels[0][1] + self.last_drag[1] < 0
and self.layer_extent_pixels[1][0] + self.last_drag[0]
> self.viewport_size[0]
and self.layer_extent_pixels[1][1] + self.last_drag[1]
> self.viewport_size[1]
):
# TODO add some margin
return
# TODO add some margin - download more tiles than should be absolutely required
min_xy, max_xy = self.visible_tile_range
self.layer_extent_pixels = (
self._to_canvas_pixels(*min_xy),
self._to_canvas_pixels(max_xy[0] + 1, max_xy[1] + 1),
)
tile_xyz_tuples = itertools.product(
range(min_xy[0], max_xy[0] + 1),
range(min_xy[1], max_xy[1] + 1),
(self.zoom_level,),
)
tile_specs = itertools.starmap(self.tile_server.to_tile_spec, tile_xyz_tuples)
tile_specs = filter(lambda ts: ts not in self.tiles, tile_specs)
# TODO purge those tiles from draw layer that are too far away to display
# FIXME make tile handler persistent (do not spawn new handlers whenever scrolling)
downloader = TileHandler(
tile_specs, self.draw_tile, thread_count=self.tile_server.thread_limit
)
downloader.start()
@property
def visible_tile_range(self) -> tuple[tuple[int, int], tuple[int, int]]:
"""Calculate which tiles should be visible
Compute given current origin offset, drag and zoom level
Returns:
tuple[tuple[int, int], tuple[int, int]]: tile (x_min, y_min), (x_max, y_max)
"""
return tuple(
tuple(
math.floor(
(
-(self.origin_offset[i] + self.last_drag[i])
+ self.viewport_size[i] * is_max
)
/ self.tile_server.tile_size[i]
)
for i in range(2)
)
for is_max in [0, 1]
)
def _to_canvas_pixels(self, tile_x: int, tile_y: int) -> tuple[int, int]:
"""Convert x, y coordinates to canvas pixel coordinates
Args:
tile_x (int): Tile x coordinate
tile_y (int): Tile y coordinate
Returns:
tuple[int, int]: x, y in canvas pixels
"""
return (
tile_x * self.tile_server.tile_size[0] + self.origin_offset[0],
tile_y * self.tile_server.tile_size[1] + self.origin_offset[1],
)
def draw_tile(self, tile_spec: TileSpec):
"""Draw tile on canvas"""
if tile_spec in self.tiles:
return
tile = MapTile(tile_spec.local_storage_path, *tile_spec.canvas_coordinates())
tile.draw_image(parent=self.tile_draw_node_id)
self.tiles.append(tile_spec)
def drag_layer(self, delta_x: float, delta_y: float):
"""Move layer to new position
Args:
delta_x (float): Change in x position
delta_y (float): Change in y position
"""
self.last_drag = (delta_x, delta_y)
self.update_tile_layer()
def finish_drag(self):
"""Finish dragging; update tile positions"""
if self.last_drag == (0.0, 0.0):
return
self.layer_extent_pixels = tuple(
tuple(min_or_max[i] + self.last_drag[i] for i in range(2))
for min_or_max in self.layer_extent_pixels
)
self.origin_offset = tuple(
sum(i) for i in zip(self.origin_offset, self.last_drag)
)
self.last_drag = (0.0, 0.0)
class MapTile:
"""Map tile"""
def __init__(self, file: Path, x_canvas: int, y_canvas: int) -> None:
self.file = file
self.width = 256
self.height = 256
self.x_canvas = x_canvas
self.y_canvas = y_canvas
self.image_tag: int | str = None
def draw_image(self, parent: int | str):
"""Draw tile"""
width, height, _, data = dpg.load_image(str(self.file))
with dpg.texture_registry():
texture = dpg.add_static_texture(width, height, data)
self.image_tag = dpg.draw_image(
texture,
(self.x_canvas, self.y_canvas),
(self.x_canvas + self.width, self.y_canvas + self.height),
parent=parent,
)
map_widget = MapWidget # pylint: disable=invalid-name
def add_map_widget(
width: int,
height: int,
center: tuple[float, float],
zoom_level: int,
tile_server: TileServer,
) -> int | str:
"""Add map widget"""
with MapWidget(
width=width,
height=height,
center=center,
zoom_level=zoom_level,
tile_server=tile_server,
) as _widget:
pass
return _widget
def configure_tile_layer() -> int | str:
"""Configure tile layer"""
...