toy_app/pages/01_overture.py

import leafmap
from leafmap import pmtiles_style
from reacton import component as component
import solara
import ipywidgets as widgets


# THings to come:
# TODO: Calculate some metrics given the area.
# TODO: add a raster to the toy
# TODO: Dynamically check the center of the map and change what's displayed depending on that.

# variables
zoom = solara.reactive(2)
center = solara.reactive((20, 0))

q_url = "https://storage.googleapis.com/ahp-research/overture/pmtiles/overture.pmtiles"

q_style = {
    "layers": [
        {
            "id": "admins",
            "source": "example_source",
            "source-layer": "admins",
            "type": "fill",
            "paint": {"fill-color": "#BDD3C7", "fill-opacity": 0.1},
        },
        {
            "id": "buildings",
            "source": "example_source",
            "source-layer": "buildings",
            "type": "fill",
            "paint": {"fill-color": "#FFFFB3", "fill-opacity": 0.5},
        },
        {
            "id": "places",
            "source": "example_source",
            "source-layer": "places",
            "type": "fill",
            "paint": {"fill-color": "#BEBADA", "fill-opacity": 0.5},
        },
        {
            "id": "roads",
            "source": "example_source",
            "source-layer": "roads",
            "type": "line",
            "paint": {"line-color": "#FB8072"},
        },
    ],
}


class Map(leafmap.Map):
    def __init__(self, **kwargs) -> None:
        super().__init__(**kwargs)
        self.add_basemap("CartoDB.DarkMatter")
        self.add_pmtiles(
            q_url,
            style=q_style,
            name="Quisheng Layer",
            overlay=True,
            show=True,
            zoom_to_layer=True,
        )

    def run_area(self):
        print(self.user_roi)


@component
def Page():
    with solara.Row():
        solara.Button(label="Area", on_click=Map.run_area)

    with solara.Column(style={"min-width": "500px"}):
        # solara components support reactive variables
        # solara.SliderInt(label="Zoom level", value=zoom, min=1, max=20)
        # using 3rd party widget library require wiring up the events manually
        # using zoom.value and zoom.set
        Map.element(  # type: ignore
            zoom=zoom.value,
            on_zoom=zoom.set,
            center=center.value,
            on_center=center.set,
            scroll_wheel_zoom=True,
            toolbar_ctrl=False,
            data_ctrl=False,
            height="780px",
        )