Function getStroke

libs/echarts/echarts.simple.js:8897–8904

* @param {string} [stroke] If specified, do not check style.textStroke. * @param {string} [lineWidth] If specified, do not check style.textStroke. * @param {number} style

(stroke, lineWidth)

 * @param {number} style
 */
function getStroke(stroke, lineWidth) {
    return (stroke == null || lineWidth <= 0 || stroke === 'transparent' || stroke === 'none')
        ? null
        // TODO pattern and gradient?
        : (stroke.image || stroke.colorStops)
        ? '#000'
        : stroke;
}

function getFill(fill) {
    return (fill == null || fill === 'none')