pencil-ui-design-system-ucharts

# uCharts Design System Initializer **Constraint**: Only use this skill when the user explicitly mentions "Pencil" and "uCharts" (or "qiun-data-charts") or when orchestrating a Pencil design system initialization task for charts. ## When to use this skill Use this skill when you need to initialize a chart/design system based on uCharts specifications in a .pen file: set up chart theme colors and create placeholder frames for chart types (line, bar, pie, etc.). ## How to use this skill This skill outputs a PENCIL_PLAN. The Agent then calls Pencil MCP tools in order: `open_document`, `set_variables`, `batch_design`, optionally `get_screenshot`. ### Step 1: Initialize Variables (set_variables) Use `mcp__pencil__set_variables` to register uCharts-related design tokens (chart theme colors, font). Follow .pen file schema. **Chart colors (series)** - `ucharts-color-1`: `#1890ff` - `ucharts-color-2`: `#52c41a` - `ucharts-color-3`: `#faad14` - `ucharts-color-4`: `#f5222d` - `ucharts-color-5`: `#722ed1` **Axis / grid** - `ucharts-axis-color`: `#e8e8e8` - `ucharts-text-color`: `#666666` - `ucharts-font-size`: `12px` Fill from uCharts theme docs if more tokens are needed. ### Step 2: Create Component Overview Structure (batch_design) Use `mcp__pencil__batch_design` to create a "Charts Overview" frame with placeholder sections for chart types (data-viz components): 1. **Basic Charts (基础图表)** - Line, Area, Column, Bar, Pie, Ring, Radar, Scatter 2. **Combined / Advanced (组合与进阶)** - Mix (mixed charts), Funnel, Candlestick, Heatmap, Gauge, WordCloud 3. **Containers (容器)** - Chart container placeholder, Legend placeholder Organize frames using Auto Layout. Keep each `batch_design` call to maximum 25 operations. ## Best Practices - Verify token values against uCharts theme documentation. - Use `set_variables` with `replace: false` unless a full reset is requested. - Chart "components" here are placeholder frames for layout; actual chart config is code-side. ## Keywords pencil, ucharts, qiun-data-charts, chart, design system, init, variables, data visualization ## References - `references/contract.md` – Design tokens and chart type naming. - `references/official.md` – Link to official documentation. - `references/examples.md` – Example PENCIL_PLAN. - `references/components.md` – Chart type specifications.