ECharts Design System Initializer

Constraint: Only use this skill when the user explicitly mentions "Pencil" and "ECharts" or when orchestrating a Pencil design system initialization task for charts.

When to use this skill

Use this skill when:

• The user wants to initialize ECharts chart theme tokens (colors, axis, text) in a Pencil .pen file
• The user needs placeholder frames for ECharts chart types (Line, Bar, Pie, Scatter, Radar, Gauge)
• The user mentions "Pencil" together with "ECharts" or chart visualization components
• An orchestrator skill (pencil-ui-designer) routes an ECharts initialization request

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 ECharts-related design tokens (chart theme colors, font). Follow .pen file schema.

Chart colors (palette)

• echarts-color-1: #5470c6
• echarts-color-2: #91cc75
• echarts-color-3: #fac858
• echarts-color-4: #ee6666
• echarts-color-5: #73c0de

Axis / grid / text

• echarts-axis-line-color: #6e7079
• echarts-split-line-color: #e0e6f1
• echarts-text-color: #6e7079
• echarts-font-size: 12px

Fill from ECharts 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, Bar, Pie, Scatter, Radar, Gauge
2. Complex Charts (复杂图表)
   • Candlestick, Heatmap, Tree, Treemap, Sunburst, Parallel, Sankey, Funnel, PictorialBar
3. Containers (容器)
   • Chart container placeholder, Legend placeholder, Grid placeholder

Organize frames using Auto Layout. Keep each batch_design call to maximum 25 operations.

Example: Initialize ECharts Variables

{
  "name": "set_variables",
  "arguments": {
    "filePath": "designs/dashboard.pen",
    "replace": false,
    "variables": {
      "echarts-color-1": "#5470c6",
      "echarts-color-2": "#91cc75",
      "echarts-color-3": "#fac858",
      "echarts-color-4": "#ee6666",
      "echarts-axis-line-color": "#6e7079",
      "echarts-text-color": "#6e7079",
      "echarts-font-size": "12px"
    }
  }
}

Best Practices

• Verify token values against ECharts 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.
• Keep each batch_design call to maximum 25 operations.

Keywords

pencil, echarts, 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.