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