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Radar Chart Application Features

1. Ring Visualization

Description

A configurable ring visualization that can display segmented data in a circular layout.

Dependencies

  • Feature 7: Responsive Layout (requires container dimensions)

Acceptance Criteria

  • Ring renderer creates a circular segment with configurable inner and outer radius
  • Segment renderer sizes each segment proportionally to its data value
  • Segment renderer supports configurable color schemes for segments
  • Text renderer calculates font size to fit within segment arc length and ring height
  • Text renderer enforces minimum font size of 6px
  • Text renderer enforces maximum font size of 14px
  • Text renderer uses Arial font family
  • Text renderer aligns text along the middle radius of each ring segment
  • Text renderer centers text within its segment arc
  • Text renderer flips text 180° in lower half of ring for readability

2. Hierarchical Ring Structure

Description

A visualization that arranges data in three concentric rings to show hierarchical relationships.

Dependencies

  • Feature 1: Ring Visualization (used for each level)
  • Feature 7: Responsive Layout (requires container dimensions)

Acceptance Criteria

  • Ring layout positions outer ring (level 1) at 0.72-0.8 of total radius
  • Ring layout positions middle ring (level 2) at 0.65-0.72 of total radius
  • Ring layout positions inner ring (level 3) at 0.59-0.65 of total radius
  • Segment layout aligns child segments within parent segment's angular span
  • Size calculator sets level 1 and 2 segment sizes proportional to their level 3 element count
  • Data validator ensures all child segments have corresponding parent segments
  • Color system assigns level 1 segments HSL colors with hue=(index/total_segments * 360), saturation=0.5, lightness=0.75
  • Color system uses neutral colors for inner rings to maintain focus on level 1 categories

3. CSV Data Import

Description

A data import system that processes CSV files into structured data.

Example CSV structure:

level 1,level 2,level 3,metric,value
domain1,category1,item1,metric1,8
domain1,category1,item2,metric1,6
domain1,category2,item3,metric2,9
domain2,category3,item4,metric1,7

Dependencies

  • Feature 10: Server-Side Data Management (handles data processing)

Acceptance Criteria

  • CSV importer accepts files with specific column structure (level 1, level 2, level 3, metric, value)
  • CSV importer validates CSV format and data integrity
  • CSV importer displays error messages for invalid data
  • CSV importer updates visualization immediately after successful import

4. Basic Radar Chart Display

Description

A circular chart that displays value distributions across multiple axes.

Dependencies

  • None (base feature)

Acceptance Criteria

  • Radar chart renderer divides chart into segments by radial axis lines
  • Radar chart renderer aligns axis lines with configurable segment boundaries
  • Radar chart renderer plots values between axis lines
  • Radar chart renderer shows concentric circles for value scales from 0 (center) to 10 (outer edge)
  • Data point renderer plots points within their corresponding segment
  • Data point renderer positions points randomly within segment to avoid overlapping
  • Data point renderer represents points as individual dots without connecting lines

5. Export Functionality

Description

A system to export visualizations in various file formats.

Dependencies

  • Feature 7: Responsive Layout (requires container dimensions)

Acceptance Criteria

  • Exporter supports SVG export with preserved vector quality
  • Exporter supports PNG export with customizable resolution
  • Exporter maintains all visual elements in exports
  • Exporter provides immediate download of exported files

6. Data Reset Capability

Description

Allows users to reset the visualization to default data

Dependencies

  • Feature 10: Server-Side Data Management (handles default data loading)

Acceptance Criteria

  • Reset button is visible in the UI
  • Reset button loads default data from server
  • Reset button clears currently loaded custom data
  • Reset button updates visualization immediately after reset

7. Responsive Layout

Description

A layout system that adapts to different screen sizes and orientations.

Dependencies

  • None (base feature)

Acceptance Criteria

  • Layout centers visualization in viewport
  • Layout maintains aspect ratio of the chart
  • Layout provides clear button layout for controls
  • Layout supports standard screen sizes without distortion

8. Data Processing and Aggregation

Description

Processes raw CSV data into hierarchical structure with value aggregation

Dependencies

  • Feature 10: Server-Side Data Management (integrated into server processing)

Acceptance Criteria

  • Data processor correctly counts occurrences at each level
  • Data processor maintains proper parent-child relationships in data structure
  • Data processor aggregates value distributions for radar chart
  • Data processor handles missing or incomplete data gracefully

9. Dynamic Text Scaling

Description

Automatically scales text labels based on available space

Dependencies

  • Feature 1: Ring Visualization (requires ring dimensions and segment sizes)

Acceptance Criteria

  • Text scaler calculates optimal font size for each ring segment
  • Text scaler enforces minimum font size of 6px
  • Text scaler handles long labels appropriately
  • Text scaler maintains consistent text orientation for readability
  • Text scaler ensures uniform text size within containers

10. Server-Side Data Management

Description

Manages data state and processing on the server

Dependencies

  • None (base feature)

Acceptance Criteria

  • Data manager maintains current data state
  • Data manager provides API endpoints for data operations
  • Data manager handles concurrent requests appropriately
  • Data manager returns appropriate error responses for invalid requests

11. Data Point Background

Description

A visualization system for showing data point ranges through background shading.

Dependencies

  • None (base feature)

Acceptance Criteria

  • Background renderer creates semi-transparent background for each segment
  • Background renderer sets configurable background color with 50% opacity
  • Background renderer bounds background by adjacent axis lines radially
  • Background renderer bounds background by minimum value radius where data points exist
  • Background renderer bounds background by maximum value radius where data points exist

12. Median Value Visualization

Description

Displays median values with special indicators and connections

Dependencies

  • Feature 4: Radar Chart Display (requires radar chart scales and structure)
  • Feature 8: Data Processing and Aggregation (requires processed value data)

Acceptance Criteria

  • Median calculator calculates median values accurately
  • Median renderer shows color-coded indicators for min/max medians
  • Median renderer connects median points with gradient lines
  • Median renderer updates median display when data changes