# Dual axes, zero aligned (Mixed example)

> WestCoast Charts 1.1.5, release, public Core release, on npm. HTML: https://westcoast-charts.com/gallery/mixed/multiple-yaxes-aligned-zero/ · Index for agents: https://westcoast-charts.com/llms.txt

Two axes with different scales whose zero lines coincide (yaxis wcc.alignZero).

- Chart type: `line` (Line)
- Collection: Mixed · Mixed / combo
- Raw configuration: https://westcoast-charts.com/gallery-src/mixed/multiple-yaxes-aligned-zero.js
- Standalone example: https://westcoast-charts.com/embed/samples/wcc/gallery/mixed/multiple-yaxes-aligned-zero.html

## Setup

```js
import WestCoastCharts from 'west-coast-charts'
```

## Options

```js
const options = {
  chart: {
    height: 380,
    fontFamily: "Inter, Geist, \"IBM Plex Sans\", system-ui, sans-serif",
    type: "line",
    toolbar: {
      show: false
    }
  },
  series: [
    {
      name: "Cash k€",
      type: "column",
      data: [64, 42, 66, 59, 62, 79, 44, 31, 20, -5, -15, -1]
    },
    {
      name: "Growth %",
      type: "line",
      data: [-0.5, -1.2, 0.2, 1.1, 2.4, 2.4, 1, 1.3, 1.8, 1.3, 1.5, 3.3]
    }
  ],
  stroke: {
    width: [0, 3]
  },
  xaxis: {
    categories: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
  },
  yaxis: [
    {
      title: {
        text: "Cash k€"
      },
      wcc: {
        alignZero: true
      }
    },
    {
      opposite: true,
      title: {
        text: "Growth %"
      },
      wcc: {
        alignZero: true
      }
    }
  ],
  title: {
    text: "Cash and growth, shared zero line"
  },
  theme: {
    mode: "light",
    preset: "coastal"
  }
}

const chart = new WestCoastCharts(document.querySelector('#chart'), options)
await chart.render()
```

## Verify

- Text check (Library 1.1.5): load `west-coast-charts/agent/describe` and call `chart.describe({ format: "json" })` for the actual drawn state. The live reader is on this example’s HTML page.
- Command line (Public agent tools 0.2.3, tested with Library 1.1.5; available from the versioned GitHub release and npm, https://westcoast-charts.com/docs/cli/index.md): `wcc chart export mixed-multiple-yaxes-aligned-zero.json --out mixed-multiple-yaxes-aligned-zero.svg --with-table` (save the options above as JSON first)