MoonChartSVG

纯 MoonBit 实现的 SVG 图表生成库，支持9种图表类型，零依赖，Builder API 设计。

Features

Bar Chart — grouped bars with multiple series
Line Chart — polylines with data point markers
Pie Chart — arc slices with percentage labels
Auto-scaling — automatic Y-axis range and tick calculation
Tableau 10 colors — professional color palette by default
Zero dependencies — pure MoonBit, SVG string output

Installation

moon add Mitsuha/MoonChartSVG

Quick Start

Bar Chart

let chart = BarChart::new()
  .title("Monthly Sales")
  .x_labels(["Jan", "Feb", "Mar", "Apr"])
  .series(Series::new("Product A", [120.0, 200.0, 150.0, 180.0]))
  .series(Series::new("Product B", [80.0, 130.0, 170.0, 140.0]))
let svg : String = chart.render()

Line Chart

let chart = LineChart::new()
  .title("Revenue Trend")
  .x_labels(["Q1", "Q2", "Q3", "Q4"])
  .series(Series::new("Revenue", [50.0, 80.0, 120.0, 200.0]))
let svg : String = chart.render()

Pie Chart

let chart = PieChart::new()
  .title("Market Share")
  .slice("Desktop", 55.0)
  .slice("Mobile", 35.0)
  .slice("Tablet", 10.0)
let svg : String = chart.render()

API Reference

Data Types

Series::new(name: String, values: Array[Float]) -> Series
Slice::new(name: String, value: Float) -> Slice

BarChart / LineChart

Method	Returns	Description
`new()`	Chart	Create with defaults (800x400)
`title(t)`	Chart	Set chart title
`x_labels(labels)`	Chart	Set X-axis category labels
`series(s)`	Chart	Add a data series
`width(w)`	Chart	Set chart width
`height(h)`	Chart	Set chart height
`render()`	String	Generate SVG output

PieChart

Method	Returns	Description
`new()`	Chart	Create with defaults (500x400)
`title(t)`	Chart	Set chart title
`slice(name, value)`	Chart	Add a pie slice
`width(w)`	Chart	Set chart width
`height(h)`	Chart	Set chart height
`render()`	String	Generate SVG output

License

Apache-2.0