chart-generation

Files (7)

• SKILL.md
• bar_chart.py · scripts/
• comparison_table.py · scripts/
• line_chart.py · scripts/
• pie_chart.py · scripts/
• positioning_matrix.py · scripts/
• tam_sam_som.py · scripts/

SKILL.md (first lines)

# Chart Generation Skill

Generate accurate, data-driven charts and visualizations using Python (matplotlib/plotly).

**Use this for real data.** For concept art and illustrations, use `image-generation` instead.

## What It Produces

| Chart Type | Use Case | Script |
|------------|----------|--------|
| **Bar Chart** | Compare values across categories | `bar_chart.py` |
| **Line Chart** | Show trends over time | `line_chart.py` |
| **Pie Chart** | Show proportions/percentages | `pie_chart.py` |
| **Positioning Matrix** | 2x2 competitive positioning | `positioning_matrix.py` |
| **Comparison Table** | Feature comparison grid | `comparison_table.py` |
| **TAM/SAM/SOM** | Market size visualization | `tam_sam_som.py` |

## Prerequisites

```bash
pip install matplotlib numpy pillow
```

No API keys required - runs locally.

## When to Use This vs Image Generation

| Scenario | Use This | Use image-generation |
|----------|----------|---------------------|
| Real data from analysis | ✅ | ❌ |
| Accurate numbers/labels | ✅ | ❌ |
| Reproducible charts | ✅ | ❌ |
| Concept/mockup visuals | ❌ | ✅ |
| Artistic illustrations | ❌ | ✅ |
| Icons and graphics | ❌ | ✅ |

---

## Chart Types

### 1. Bar Chart

Compare values across categories.

```bash
python3 ${SKILL_PATH}/skills/chart-generation/scripts/bar_chart.py \
  --labels '["Product A", "Product B", "Product C"]' \
  --values '[85, 62, 45]' \
  --title "Feature Comparison" \
  --ylabel "Score" \
  --output bar_chart.png
```

**Options:**
- `--horizontal` - Horizontal bars instead of vertical
- `--colors` - Custom colors: `'["#4CAF50", "#2196F3", "#FF9800"]'`
- `--show-values` - Display values on bars

---

### 2. Line Chart

Show trends over time or progression.

```bash
python3 ${SKILL_PATH}/skills/chart-generation/scripts/line_chart.py \
  --x '["Jan", "Feb", "Mar", "Apr", "May", "Jun"]' \
  --y '[100, 150, 180, 220, 310, 450]' \
  --title "Monthly Revenue Growth" \
  --xlabel "Month" \
  --ylabel "Revenue ($K)" \
  --output growth_chart.png
```

**Options:**
- `--multi` - Multiple lines: `--y '[[100,150,200], [80,120,180]]' --legend '["Product A", "Product B"]'`
- `--fill` - Fill area under line
- `--markers` - Show data point markers

---

### 3. Pie Chart

Show proportions and percentages.

```bash
python3 ${SKILL_PATH}/skills/chart-generation/scripts/pie_chart.py \
  --labels '["Engineering", "Marketing", "Sales", "Operations"]' \
  --values '[40, 25, 20, 15]' \
  --title "Use of Funds" \
  --output pie_chart.png
```

**Options:**
- `--donut` - Donut chart (hollow center)
- `--explode` - Explode a slice: `--explode 0` (first slice)
- `--show-percent` - Show percentages on slices

---

### 4. Positioning Matrix (2x2)

Competitive positioning on two axes.

```bash
python3 ${SKILL_PATH}/skills/chart-generation/scripts/positioning_matrix.py \
  --companies '["Your Product", "Competitor A", "Competitor B", "Competitor C"]' \
  --x-values '[70, 90, 50, 30]' \
  --y-values '[80, 85, 60, 45]' \
  --x-label "Price (Low → High)" \
  --y-label "Features (Basic → Advanced)" \
  --title "Competitive Positioning" \
  --output positioning.png
```

**Options:**
- `--quadrant-labels` - Label quadrants: `'["Niche", "Leaders", "Laggards", "Challengers"]'`
- `--highlight` - Highlight your position: `--highlight 0`
- `--sizes` - Bubble sizes for market share

From michaelboeding/skills, MIT.

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