| import altair as alt |
| import numpy as np |
| import pandas as pd |
| import streamlit as st |
|
|
| """ |
| # Welcome to Streamlit! |
| |
| Edit `/streamlit_app.py` to customize this app to your heart's desire :heart:. |
| If you have any questions, checkout our [documentation](https://docs.streamlit.io) and [community |
| forums](https://discuss.streamlit.io). |
| |
| In the meantime, below is an example of what you can do with just a few lines of code: |
| """ |
|
|
| num_points = st.slider("Number of points in spiral", 1, 10000, 1100) |
| num_turns = st.slider("Number of turns in spiral", 1, 300, 31) |
|
|
| indices = np.linspace(0, 1, num_points) |
| theta = 2 * np.pi * num_turns * indices |
| radius = indices |
|
|
| x = radius * np.cos(theta) |
| y = radius * np.sin(theta) |
|
|
| df = pd.DataFrame({ |
| "x": x, |
| "y": y, |
| "idx": indices, |
| "rand": np.random.randn(num_points), |
| }) |
|
|
| st.altair_chart(alt.Chart(df, height=700, width=700) |
| .mark_point(filled=True) |
| .encode( |
| x=alt.X("x", axis=None), |
| y=alt.Y("y", axis=None), |
| color=alt.Color("idx", legend=None, scale=alt.Scale()), |
| size=alt.Size("rand", legend=None, scale=alt.Scale(range=[1, 150])), |
| )) |
