120 lines
3.7 KiB
Python
120 lines
3.7 KiB
Python
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# Copyright 2018-2022 Streamlit Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import inspect
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import textwrap
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from urllib.error import URLError
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import pandas as pd
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import pydeck as pdk
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import streamlit as st
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from streamlit.hello.utils import show_code
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def mapping_demo():
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@st.cache
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def from_data_file(filename):
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url = (
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"http://raw.githubusercontent.com/streamlit/"
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"example-data/master/hello/v1/%s" % filename
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)
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return pd.read_json(url)
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try:
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ALL_LAYERS = {
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"Bike Rentals": pdk.Layer(
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"HexagonLayer",
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data=from_data_file("bike_rental_stats.json"),
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get_position=["lon", "lat"],
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radius=200,
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elevation_scale=4,
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elevation_range=[0, 1000],
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extruded=True,
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),
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"Bart Stop Exits": pdk.Layer(
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"ScatterplotLayer",
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data=from_data_file("bart_stop_stats.json"),
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get_position=["lon", "lat"],
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get_color=[200, 30, 0, 160],
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get_radius="[exits]",
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radius_scale=0.05,
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),
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"Bart Stop Names": pdk.Layer(
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"TextLayer",
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data=from_data_file("bart_stop_stats.json"),
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get_position=["lon", "lat"],
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get_text="name",
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get_color=[0, 0, 0, 200],
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get_size=15,
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get_alignment_baseline="'bottom'",
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),
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"Outbound Flow": pdk.Layer(
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"ArcLayer",
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data=from_data_file("bart_path_stats.json"),
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get_source_position=["lon", "lat"],
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get_target_position=["lon2", "lat2"],
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get_source_color=[200, 30, 0, 160],
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get_target_color=[200, 30, 0, 160],
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auto_highlight=True,
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width_scale=0.0001,
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get_width="outbound",
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width_min_pixels=3,
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width_max_pixels=30,
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),
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}
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st.sidebar.markdown("### Map Layers")
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selected_layers = [
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layer
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for layer_name, layer in ALL_LAYERS.items()
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if st.sidebar.checkbox(layer_name, True)
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]
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if selected_layers:
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st.pydeck_chart(
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pdk.Deck(
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map_style=None,
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initial_view_state={
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"latitude": 37.76,
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"longitude": -122.4,
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"zoom": 11,
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"pitch": 50,
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},
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layers=selected_layers,
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)
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)
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else:
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st.error("Please choose at least one layer above.")
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except URLError as e:
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st.error(
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"""
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**This demo requires internet access.**
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Connection error: %s
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"""
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% e.reason
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)
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st.set_page_config(page_title="Mapping Demo", page_icon="🌍")
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st.markdown("# Mapping Demo")
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st.sidebar.header("Mapping Demo")
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st.write(
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"""This demo shows how to use
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[`st.pydeck_chart`](https://docs.streamlit.io/library/api-reference/charts/st.pydeck_chart)
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to display geospatial data."""
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)
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mapping_demo()
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show_code(mapping_demo)
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