Mydcc

My Dash Core Components

• Installing
• Requirements
• Usage
  • mydcc.Listener
  • mydcc.Listener_mapbox
  • mydcc.Relayout
  • mydcc.Change_trace
  • mydcc.Change_trace_mapbox
• Learning more about dash ...

Installing :

pip install mydcc

Requirements：

• dash -- The core dash backend
• dash-renderer -- The dash front-end
• dash-html-components -- HTML components
• dash-core-components -- Supercharged components
• plotly -- Plotly graphing library used in examples

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Usage :

import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output, Event, State
import mydcc

app = dash.Dash()
app.layout = html.Div(...)

@app.callback(...)
def myfun(...):
    ...
    return ...

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

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1. mydcc.Listener :

Get mouse position of plotly graph

Usage :

app.layout = html.Div([
    mydcc.Listener( id = "uuu", aim = 'graph' ),
    dcc.Graph( id = 'graph',
               figure = { 'data': [  {'x': [1, 2, 3], 'y': [4, 1, 2]}  ]  }
              ),
    html.Div( id = 'text' )
])

@app.callback(
    Output('text', 'children'),
    [Input('uuu', 'data')])
def myfun(ddd):
    if ddd is None : return('')
    return str(ddd['x']) + ' and ' + str(ddd['y']) 

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2. mydcc.Listener_mapbox :

Get mouse position for plotly mapbox graph

Usage :

app.layout = html.Div([
    mydcc.Listener_mapbox( id = "uuu", aim = 'graph'  ),
    dcc.Graph( id = 'ggg', figure = figgure_with_mapbox ),
    html.Div( id = 'text' )
])
  
@app.callback(
    Output('text', 'children'),
    [Input('uuu', 'data')])
def myfun(ddd):
    if ddd is None : return('')
    return str(ddd['x']) + ' and ' + str(ddd['y']) 

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3. mydcc.Relayout :

Relayout plotly graph

Usage :

app.layout = html.Div([
    mydcc.Relayout( id = "rrr", aim = 'graph' ),
    dcc.Graph( id = 'graph',
               figure = { 'data': [  {'x': [1, 2, 3], 'y': [4, 1, 2]}  ]  }
              ),
    dcc.Input(id = 'in',
              placeholder = 'Enter a title ...',
              type = 'text',
              value = ''  
              )
])

@app.callback(
    Output('rrr', 'layout'),
    [Input('in', 'value')])
def myfun(x):
    return {'title':x}

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4. mydcc.Change_trace :

Change plotly graph trace (only for graph with one trace )

Usage :

app.layout = html.Div([
    dcc.Graph(
        id = 'graph',    
        figure = {
            'data': [
                { 'x': [1, 2, 3], 'y': [4, 1, 2] },
            ],
            'layout': {
                'title': 'Dash Data Visualization',
                'xaxis': { 'range': [0,50] },
                'yaxis': { 'range': [0,50] }
            }
        }
    ),
    mydcc.Listener(id = "uuu", aim = 'graph'),
    mydcc.Change_trace(id = 'ii', aim = 'graph')
])

@app.callback(
    Output('ii', 'data'),
    [Input('uuu', 'data')])
def myfun(ddd):
    data = {'disable':'y'}
    if type(ddd['x']) != str and ddd['x'] < 30:
        data = dict(x = [ddd['x']],
                    y = [ddd['y']],
                    opacity = 1
                    )
    return data

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5. mydcc.Change_trace_mapbox :

Change plotly mapbox graph trace (only for graph with one trace )

Usage :

app.layout = html.Div([
    dcc.Graph( id = 'graph', figure = figgure_with_mapbox ),
    mydcc.Listener_mapbox(id = "uuu", aim = 'graph'),
    mydcc.Change_trace_mapbox(id = 'ii', aim = 'graph')
])

@app.callback(
    Output('ii', 'data'),
    [Input('uuu', 'data')])
def myfun(ddd):
    data = {'lon':[1], 'lat':[1], 'type': 'scattermapbox'}
    if type(ddd['x']) != str :
        data = dict(lon = [ ddd['x'] ],
                    lat = [ ddd['y'] ],
                    type = 'scattermapbox',
                    opacity = 1
                    )
    return data

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Dash

Go to this link to learn about Dash.