85 lines
2.9 KiB
Python
85 lines
2.9 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 streamlit as st
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import inspect
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import textwrap
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import numpy as np
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from typing import Any
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from streamlit.hello.utils import show_code
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def animation_demo():
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# Interactive Streamlit elements, like these sliders, return their value.
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# This gives you an extremely simple interaction model.
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iterations = st.sidebar.slider("Level of detail", 2, 20, 10, 1)
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separation = st.sidebar.slider("Separation", 0.7, 2.0, 0.7885)
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# Non-interactive elements return a placeholder to their location
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# in the app. Here we're storing progress_bar to update it later.
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progress_bar = st.sidebar.progress(0)
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# These two elements will be filled in later, so we create a placeholder
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# for them using st.empty()
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frame_text = st.sidebar.empty()
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image = st.empty()
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m, n, s = 960, 640, 400
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x = np.linspace(-m / s, m / s, num=m).reshape((1, m))
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y = np.linspace(-n / s, n / s, num=n).reshape((n, 1))
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for frame_num, a in enumerate(np.linspace(0.0, 4 * np.pi, 100)):
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# Here were setting value for these two elements.
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progress_bar.progress(frame_num)
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frame_text.text("Frame %i/100" % (frame_num + 1))
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# Performing some fractal wizardry.
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c = separation * np.exp(1j * a)
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Z = np.tile(x, (n, 1)) + 1j * np.tile(y, (1, m))
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C = np.full((n, m), c)
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M: Any = np.full((n, m), True, dtype=bool)
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N = np.zeros((n, m))
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for i in range(iterations):
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Z[M] = Z[M] * Z[M] + C[M]
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M[np.abs(Z) > 2] = False
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N[M] = i
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# Update the image placeholder by calling the image() function on it.
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image.image(1.0 - (N / N.max()), use_column_width=True)
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# We clear elements by calling empty on them.
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progress_bar.empty()
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frame_text.empty()
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# Streamlit widgets automatically run the script from top to bottom. Since
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# this button is not connected to any other logic, it just causes a plain
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# rerun.
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st.button("Re-run")
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st.set_page_config(page_title="Animation Demo", page_icon="📹")
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st.markdown("# Animation Demo")
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st.sidebar.header("Animation Demo")
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st.write(
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"""This app shows how you can use Streamlit to build cool animations.
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It displays an animated fractal based on the the Julia Set. Use the slider
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to tune different parameters."""
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)
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animation_demo()
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show_code(animation_demo)
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