Color scale segments in radar plot

📊 Plotly Python
1

I am trying to plot a radarplot with a scale of 0 -3 in .5 increments, and then teh plot area between 0 and.5 white, .5 to 1 green, 1 - 2 yellow and 2 -3 Red but cannot find a way to color the graph radials between those values a specific color. I’d appreciate being pointed to any documentation on how to do this.

2

Welcome @jlc !

Could you provide some sample code?

3

Sure. Here is a snippet. I’d like to color the radial area between 0-1 green, 1- 2 yellow, and 2 - 3 red.. Sort of like. bullseye with the plot overlaying the colors.

    fig = go.Figure(data=go.Scatterpolar(
    r = values,
    theta = titles,
    mode =  'lines+markers',
    line_color="black",


    marker= dict(
        color = colors,
        size = 10,



    ),




        ))

    fig.update_layout(
        title = 'Project',
        polar=dict(
            radialaxis=dict(
            visible=True,
            range=[0, 3],
            ),
            angularaxis=dict(
            rotation=90, # Rotates the axis 90 degrees counterclockwise
            direction="clockwise"

        )
        ),
        showlegend=False,
        height = 600,

        )



    plot_div = pyo.plot(fig, output_type='div')

.

4

Hello @jlc ,

A quick & dirty solution might be overlaying a barpolar plot. You would need to tweak the axes and hoverinfo.

import plotly.graph_objects as go
import numpy as np

values = np.ones(4)
radius = np.arange(4)

fig = go.Figure(
    data=go.Scatterpolar(
        r = radius,
        mode =  'lines+markers',
        line_color="black"
        )
    )

fig.update_layout(
    title = 'Project',
    polar=dict(
        radialaxis=dict(
            visible=True,
            range=[0, 5],
            ),
        angularaxis=dict(
            rotation=90, # Rotates the axis 90 degrees counterclockwise
            direction="clockwise"
        )
    ),
    showlegend=False,
    height = 600
)

for i, color in enumerate(["red", "green", "yellow"], start=1): 
    fig.add_trace(
            go.Barpolar(
            r=values * i,
            marker_color=color
        )
    )

fig.update_layout(polar_bargap=0)
fig.update_traces(dict(marker=dict(line=dict(width=0, color="rgba(255,0,0,0)"))))
fig.show()

newplot (6)
newplot (6)664×600 21.7 KB

5

Thanks. I’ll play around with it but looking at the colors it’s likely to be too garish, even muted so I’ll probably stick to just coloring the markers on a grey background

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