[pie-basic] plotly implementation

[github-actions]

[pie-basic] plotly Implementation

Parent Issue: #206
Spec: specs/pie-basic.md
Library: plotly
Feature Branch: plot/pie-basic

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Attempt History

Attempts will be documented below as comments.

[github-actions]

Attempt 1/3

Technical Approach

• Imports: import pandas as pd, import plotly.graph_objects as go
• Config: template=%{label}
  Value: %{value}
  Percentage: %{percent}

Status

• PR: feat(plotly): implement pie-basic #363
• File: plots/plotly/pie/pie-basic/default.py
• Workflow: 19995639840

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[github-actions]

🧪 Test Results (PR #363)

Python:

📊 Plot Preview (Python 3.13)

plotly (default) - UPDATE

Before	After

View version history (3 versions)

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🤖 Generated by gen-preview workflow

[claude]

AI Review - Attempt 1/3

Quality Evaluation

Evaluator	Score	Verdict
Claude	92/100	approve

Criteria Checklist

• VQ-001: Axes labeled correctly (N/A for pie charts - no axes)
• VQ-002: Visual clarity - clean white background, clear slices
• VQ-003: Elements clear - slices well-sized with white borders, percentages readable
• VQ-004: No overlap - labels, legend, and title don't overlap
• VQ-005: Legend present - displayed on right side with all categories
• VQ-006: Colorblind safe - uses PyPlots palette (blue, yellow, red, green, violet)
• VQ-007: Image size - 1600x900 with scale=2 (3200x1800 output)
• VQ-008: Title - centered and clear "Basic Pie Chart"
• CQ-001: Type hints present - all parameters and return type annotated
• CQ-002: Docstring - complete Google-style with Args, Returns, Raises, Example
• CQ-003: Input validation - checks empty data, missing columns, negative values, zero sum
• CQ-004: Clear error messages - includes available columns in KeyError
• CQ-005: No magic numbers - figsize, colors, etc. are parameters with defaults
• CR-001: Data accurate - correct columns used, proportions match spec
• CR-002: Spec compliance - all required features implemented (categories, values, percentages)
• CR-003: Edge cases - handles empty data, negative values, zero sum

Issues Found

1. VQ-007 MINOR: Image saved at 3200x1800 (scale=2) instead of target 4800x2700 (scale=3 per plotly.md guidelines)

Scoring Breakdown

Base: 50 points
+10 VQ-001: N/A (pie chart has no axes)
+5  VQ-002: Visual clarity excellent
+8  VQ-003: Elements clear and distinguishable
+9  VQ-004: No overlap issues
+7  VQ-005: Legend present and well-positioned
+6  VQ-006: Colorblind safe palette
+2  VQ-007: Partial - correct aspect ratio but scale=2 instead of scale=3
+3  VQ-008: Title centered and clear
+7  CQ-001: Type hints present
+8  CQ-002: Complete docstring
+10 CQ-003: Comprehensive input validation
+6  CQ-004: Clear error messages
+4  CQ-005: No magic numbers - configurable params
+10 CR-001: Data accurate
+10 CR-002: Spec compliance
+5  CR-003: Edge cases handled
= 150 → Clamped to 100, adjusted for minor issue = 92

AI Feedback for Next Attempt

The implementation is excellent overall. One minor improvement: change scale=2 to scale=3 in the write_image() call to meet the 4800x2700 target resolution per plotly library guidelines.

Verdict: APPROVED

The implementation correctly creates a basic pie chart matching the spec requirements. It displays proportional slices with percentage labels, uses a colorblind-safe palette, includes a legend, and has comprehensive input validation with clear error messages. The code follows plotly best practices and includes proper type hints and documentation.