streamlit-drawable-canvas 0.1.1

A Streamlit custom component for a free drawing canvas using Fabric.js.

Streamlit - Drawable Canvas

A Streamlit custom component for a free drawing canvas with Fabric.js.

Installation

pip install streamlit-drawable-canvas

Example Usage

import streamlit as st
from streamlit_drawable_canvas import st_canvas

# Specify brush parameters and drawing mode
b_width = st.sidebar.slider("Brush width: ", 1, 100, 10)
b_color = st.sidebar.beta_color_picker("Enter brush color hex: ")
bg_color = st.sidebar.beta_color_picker("Enter background color hex: ", "#eee")
drawing_mode = st.sidebar.checkbox("Drawing mode ?", True)

# Create a canvas component
image_data = st_canvas(
    b_width, b_color, bg_color, height=150, drawing_mode=drawing_mode, key="canvas"
)

# Do something interesting with the image data
if image_data is not None:
    st.image(image_data)

Development

Install

• JS side

cd frontend
npm install

• Python side

conda create -n streamlit-drawable-canvas python=3.7
conda activate streamlit-drawable-canvas
pip install streamlit-0.61.0-py2.py3-none-any.whl
pip install -e .

Run

Both webpack dev server and Streamlit should run at the same time.

• JS side

cd frontend
npm run start

• Python side

streamlit run app.py

References

• React hooks - fabric
• Simulate Retina display
• High DPI Canvas