PyCafe - Dash - DMC experiment,stacked area chart

app.py
requirements.txt
app.py
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import dash_mantine_components as dmc
from dash_iconify import DashIconify
from dash import Dash, _dash_renderer, Input, Output, State, clientside_callback,html, callback
import pandas as pd


# Ensure React version compatibility
_dash_renderer._set_react_version("18.2.0")

# Load Data
df = pd.read_csv("https://raw.githubusercontent.com/plotly/Figure-Friday/refs/heads/main/2025/week-10/Popularity%20of%20Programming%20Languages%20from%202004%20to%202024.csv")

# Split Date into month and year
df[['month', 'year']] = df['Date'].str.split(' ', expand=True)

# Keep only December data and drop unnecessary columns
df = df.loc[df['month'] == 'December'].drop(columns=['month', 'Date'])


# columns will be used to create the series
columns = list(df.columns)[:-1]  # Exclude the 'year' column

# Convert year to integer for proper axis scaling
df["year"] = df["year"].astype(int)



# Prepare data for AreaChart
data = df.to_dict('records')



colors = ['yellow.5', 'teal.5', 'cyan.5','pink.5',
          'yellow.9', 'teal.9', 'cyan.9','pink.9',
          'yellow.2', 'teal.2' ]



# Initialize Dash App
app = Dash(external_stylesheets=dmc.styles.ALL)

# Theme Toggle Switch
theme_toggle = dmc.Switch(
    offLabel=DashIconify(icon="radix-icons:sun", width=15, color=dmc.DEFAULT_THEME["colors"]["yellow"][8]),
    onLabel=DashIconify(icon="radix-icons:moon", width=15, color=dmc.DEFAULT_THEME["colors"]["yellow"][6]),
    id="color-scheme-toggle",
    persistence=True,
    color="grey",
    w=70
)



# Define Layout
app.layout = dmc.MantineProvider(
    dmc.Container(
        [  
            dmc.Flex(
                [
            dmc.Title("Usage % of most popular programming languages over the years", order=3),
             theme_toggle,
            dmc.Divider(mb="lg"),
            ],direction={"base": "column", "sm": "row"},
                gap={"base": "sm", "sm": "lg"},
                align='center',
                justify={"lg": "flex-end","sm": "center"},
                style={"marginBottom": "2rem"}),
           
            dmc.Divider(variant="solid", style = {"marginBottom":"2rem"}), 
            
            dmc.Flex(
    [
            dmc.MultiSelect(
            label="Select your favorite programming language",
            placeholder="Select all you like!, max 10",
            id="framework-multi-select",
            value=["PHP", "Python", "Java", "C/C++"],
            data= [{"value": lang, "label": lang} for lang in columns],
            w=400,
            mb=10,
            maxValues=10,
            clearable=True,
            searchable = True
            
        ),
            dmc.Switch(
                label="Zoom",
                id="switch-zoom",
                checked=True,
                onLabel="ON",
                offLabel="OFF"
        ),

            
            
            
            ],direction={"base": "column", "sm": "row"},
                gap={"base": "sm", "sm": "lg"},
                align='center',
                justify={"lg": "flex-end","sm": "center"},),


            html.Div(id='areachart'),
        ],
        fluid=False,
    ),
    id="mantine-provider",
    forceColorScheme="light",
)



@callback(
    Output("areachart", "children"), Input("framework-multi-select", "value"), Input("switch-zoom", "checked")
)
def select_value(value, checked):

    # Assign colors to languages, cycling if there are more than 10
    series = [{"name": lang, "color": colors[i % len(colors)]} for i, lang in enumerate(value)]
    
    if checked: 
        yAxisProps_zoom={}
    else: 
        yAxisProps_zoom={"domain": [0, 100]}
    
    
    return dmc.AreaChart(
            h=600,
            dataKey="year",  # X-axis
            data=data,  # Processed data
            type="stacked",
            series=series,  
            yAxisProps=yAxisProps_zoom,
            curveType="monotone",
            tickLine="xy",
            xAxisLabel="Year",
            yAxisLabel="Percentage of whole",
            withGradient=True,
            withXAxis=True,
            withYAxis=True,
            withDots=False,
            withLegend=True,
            fillOpacity="0.5"
        )



# Clientside Callback for Theme Toggle
clientside_callback(
    """ 
    (switchOn) => {
       document.documentElement.setAttribute('data-mantine-color-scheme', switchOn ? 'dark' : 'light');  
       return window.dash_clientside.no_update;
    }
    """,
    Output("color-scheme-toggle", "id"),
    Input("color-scheme-toggle", "checked"),
)

# Run the App
if __name__ == "__main__":
    app.run(debug=True)
Py.Cafe

2025-figurefriday-w10

DMC experiment,stacked area chart
