JavaScript ChartsFormatters

Formatters allow customisation of the representation of numbers and dates.

formatter: {
    x: (params) => {
        const degrees = Math.trunc(params.value);
        const orientation = degrees > 0 ? 'E' : degrees < 0 ? 'W' : '';
        return `${Math.abs(degrees)}° ${orientation}`;
    },
    y: (params) => {
        const degrees = Math.trunc(params.value);
        const orientation = degrees > 0 ? 'N' : degrees < 0 ? 'S' : '';
        return `${Math.abs(degrees)}° ${orientation}`;
    },
    size: (params) => {
        return params.value.toLocaleString('en-US', { style: 'decimal', maximumFractionDigits: 0 })
    },
}

In this configuration:

• x formats the x-axis values as degrees with a longitude direction of East or West.
• y formats the y-axis values as degrees with a latitude direction of North or South.
• size formats the size values as a decimal number with no fractional digits.

The available properties are x, y, angle, radius, size, color, label, secondaryLabel, calloutLabel, and sectorLabel.