[radar-multi] Multi-Series Radar Chart

[MarkusNeusinger]

Plot Request

Multiple overlapping radar polygons for comparison.

Use Cases

• Product feature comparison
• Skill assessment across people
• Performance metrics comparison

Expected Features

• Multiple overlapping polygons
• Different colors per series
• Legend and labeled axes

[claude]

✅ Spec ID: radar-multi

Rationale: While radar-basic supports optional multiple series, this spec focuses on comparison as the primary use case with emphasis on overlapping polygons, making it a distinct multi-series variant.

Add label approved to begin generation.

[github-actions]

✅ Specification Ready: radar-multi

PR: #2038

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specification.md

radar-multi: Multi-Series Radar Chart

Description

A multi-series radar chart overlays multiple data polygons on shared axes radiating from a center point, enabling direct comparison across several entities or categories. Each series is rendered as a distinct colored polygon, making it easy to identify relative strengths and weaknesses at a glance. This visualization excels at comparative analysis where multiple subjects are evaluated across the same set of metrics.

Applications

• Product feature comparison showing how competing products score across attributes like price, quality, durability, and support
• Employee or team skill assessments comparing individuals across competencies such as communication, technical skills, leadership, and creativity
• Sports player or team performance comparison across metrics like speed, accuracy, endurance, and teamwork
• Business competitor analysis across key performance indicators such as market share, customer satisfaction, and innovation

Data

• category (string) - axis labels representing different variables/dimensions being compared
• value (numeric) - values for each axis per series (0-100 scale recommended for clarity)
• series (string) - identifier for each data series (e.g., product name, person name, team)
• Size: 5-8 axes, 2-5 series for optimal comparison clarity

Notes

• Use filled polygons with transparency (alpha ~0.2-0.3) to allow visibility of overlapping areas
• Assign distinct, contrasting colors to each series for easy differentiation
• Include a legend identifying each series by color
• Add gridlines at regular intervals (e.g., 20, 40, 60, 80, 100) for value reference
• Label each axis clearly at the outer edge
• Close each polygon by connecting the last point back to the first
• Consider using both fill and outline for each polygon to enhance visibility

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Next: Add approved label to merge this specification to main.

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