dash-extendable-graph 1.1.0

plotly-dash custom component. Adds Plotly.extendTraces() support to dash_core_components.Graph()

dash-extendable-graph

dash-extendable-graph is a Dash component library. This library contains a single component: ExtendableGraph. The component is a fork of the Graph() component of dash-core-components (v 1.3.1). However, the extendData for this component has been modified to follow an api that matches the format of figure['data'] (as opposed to the api defined Graph.extendData and Plotly.extendTraces()).

Note: As of version 1.1.0, dash-extendable-graph includes PlotlyJS as an internal dependency. Previously, the component assumed it would be used in conjunction with dash-core-components, but as of version 1.4.0, PlotlyJS is only available asynchronously when a Graph component exists on the page.

Installation

Get started with:

1. Install Dash and dependencies: https://dash.plot.ly/installation

$ pip install -r requirements.txt

2. Install dash-extendable-graph

$ pip install dash-extendable-graph

3. Run python usage.py
4. Visit http://localhost:8050 in your web browser

Usage

General examples may be found in usage.py

extendData properties

1. updateData [list]: a list of dictionaries, each containing representing trace data (e.g dict(x=[1], y=[1]))
2. traceIndices [list, optional]: identify the traces that should be extended. If the specified trace index does not exist, the corresponding trace shall be appended to the figure.
3. maxPoints [number, optional]: define the maximum number of points to plot in the figure (per trace).

Based on the Plotly.extendTraces() api. However, the updateData key has been modified to better match the contents of Plotly.plot() (e.g. Graph.figure). Aside from following dash-familiar styling, this component allows the user to extend traces of different types in a single call (Plotly.extendTraces() takes a map of key:val and assumes all traces will share the same data keys).

Code

Extend a trace once per second, limited to 100 maximum points.

import dash_extendable_graph as deg
import dash
from dash.dependencies import Input, Output, State
import dash_html_components as html
import dash_core_components as dcc
import random

app = dash.Dash(__name__)

app.scripts.config.serve_locally = True
app.css.config.serve_locally = True

app.layout = html.Div([
    deg.ExtendableGraph(
        id='extendablegraph_example',
        figure=dict(
            data=[{'x': [0],
                   'y': [0],
                   'mode':'lines+markers'
                   }],
        )
    ),
    dcc.Interval(
        id='interval_extendablegraph_update',
        interval=1000,
        n_intervals=0,
        max_intervals=-1),
    html.Div(id='output')
])


@app.callback(Output('extendablegraph_example', 'extendData'),
              [Input('interval_extendablegraph_update', 'n_intervals')],
              [State('extendablegraph_example', 'figure')])
def update_extendData(n_intervals, existing):
    x_new = existing['data'][0]['x'][-1] + 1
    y_new = random.random()
    return [dict(x=[x_new], y=[y_new])], [0], 100


if __name__ == '__main__':
    app.run_server(debug=True)

Contributing

See CONTRIBUTING.md

Local Installation

1. Dependencies

$ npm install
$ virtualenv venv
$ . venv/bin/activate
$ pip install -r requirements.txt
$ pip install -r tests/requirements.txt

2. Build

$ npm run build

3. Check out the component via component-playground

$ npm run start

The demo app is in `src/demo`

4. Check out the sample Dash application using the component

$ python setup.py install
$ python usage.py

Tests

Integration tests for the component can be found in tests/

$pytest --headless tests

(note: the --headless param runs tests without the GUI)

Create a production build and publish:

$ rm -rf dist
$ npm run build
$ python setup.py sdist bdist_wheel
$ twine upload dist/*
$ npm publish

Test your tarball by copying it into a new environment and installing it locally:

$ pip install dash_extendable_graph-X.X.X.tar.gz