Function makeLabelFormatter

libs/echarts/echarts.simple.js:37851–37886

* @param {module:echarts/coord/Axis} axis * @return {Function} Label formatter function. * param: {number} tickValue, * param: {number} idx, the index in all ticks. * If category axis, this param is not requied. * return: {string} label string.

(axis)

 *         return: {string} label string.
 */
function makeLabelFormatter(axis) {
    var labelFormatter = axis.getLabelModel().get('formatter');
    var categoryTickStart = axis.type === 'category' ? axis.scale.getExtent()[0] : null;

    if (typeof labelFormatter === 'string') {
        labelFormatter = (function (tpl) {
            return function (val) {
                // For category axis, get raw value; for numeric axis,
                // get foramtted label like '1,333,444'.
                val = axis.scale.getLabel(val);
                return tpl.replace('{value}', val != null ? val : '');
            };
        })(labelFormatter);
        // Consider empty array
        return labelFormatter;
    }
    else if (typeof labelFormatter === 'function') {
        return function (tickValue, idx) {
            // The original intention of `idx` is "the index of the tick in all ticks".
            // But the previous implementation of category axis do not consider the
            // `axisLabel.interval`, which cause that, for example, the `interval` is
            // `1`, then the ticks "name5", "name7", "name9" are displayed, where the
            // corresponding `idx` are `0`, `2`, `4`, but not `0`, `1`, `2`. So we keep
            // the definition here for back compatibility.
            if (categoryTickStart != null) {
                idx = tickValue - categoryTickStart;
            }
            return labelFormatter(getAxisRawValue(axis, tickValue), idx);
        };
    }
    else {
        return function (tick) {
            return axis.scale.getLabel(tick);
        };
    }
}

function getAxisRawValue(axis, value) {
    // In category axis with data zoom, tick is not the original