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/**
* @see https://github.com/Raruto/leaflet-elevation/issues/211
*
* @example
* ```js
* L.control.Elevation({ handlers: [ 'Labels' ], labelsRotation: 25, labelsAlign: 'start' })
* ```
*/
export function Labels() {
this.on('elechart_updated', function(e) {
const pointG = this._chart._chart.pane('point');
const textRotation = this.options.labelsRotation ?? -90;
const textAnchor = this.options.labelsAlign;
if (90 == Math.abs(textRotation)) {
pointG.selectAll('text')
.attr('dy', '4px')
.attr("dx", (d, i, el) => Math.sign(textRotation) * (this._height() - d3.select(el[i].parentElement).datum().y - 8) + 'px')
.attr('text-anchor', textRotation > 0 ? 'end' : 'start')
.attr('transform', 'rotate(' + textRotation + ')')
pointG.selectAll('circle')
.attr('r', '2.5')
.attr('fill', '#fff')
.attr("stroke", '#000')
.attr("stroke-width", '1.1');
} else if (!isNaN(textRotation)) {
pointG.selectAll('text')
.attr("dx", "4px")
.attr("dy", "-9px")
.attr('text-anchor', textAnchor ?? (0 == textRotation ? 'start' : 'middle'))
.attr('transform', 'rotate('+ -textRotation +')')
}
});
return { };
}
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