# getPiperCoordinates

> Piper diagram coordinates: cation (Ca, Mg, Na+K) and anion (HCO₃+CO₃, Cl, SO₄) meq percentages of each triangle, and the projected diamond point. Returns undefined when either triangle sums to 0 or is unmeasured.

> **getPiperCoordinates**(`sample`): [`PiperCoordinates`](/utils/api/type-aliases/PiperCoordinates) \| `undefined`

Piper diagram coordinates: cation (Ca, Mg, Na+K) and anion (HCO₃+CO₃, Cl,
SO₄) meq percentages of each triangle, and the projected diamond point.
Returns `undefined` when either triangle sums to 0 or is unmeasured.

## Parameters

### sample

`WaterSample`

## Returns

[`PiperCoordinates`](/utils/api/type-aliases/PiperCoordinates) \| `undefined`