Function createIcon

libs/echarts/echarts.simple.js:18138–18159

* @param {string} iconStr Support 'image://' or 'path://' or direct svg path. * @param {Object} [opt] Properties of `module:zrender/Element`, except `style`. * @param {Object} [rect] {x, y, width, height} * @return {module:zrender/Element} Icon path or image element.

(iconStr, opt, rect)

 * @return {module:zrender/Element} Icon path or image element.
 */
function createIcon(iconStr, opt, rect) {
    opt = extend({rectHover: true}, opt);
    var style = opt.style = {strokeNoScale: true};
    rect = rect || {x: -1, y: -1, width: 2, height: 2};

    if (iconStr) {
        return iconStr.indexOf('image://') === 0
            ? (
                style.image = iconStr.slice(8),
                defaults(style, rect),
                new ZImage(opt)
            )
            : (
                makePath(
                    iconStr.replace('path://', ''),
                    opt,
                    rect,
                    'center'
                )
            );
    }
}

/**
 * Return `true` if the given line (line `a`) and the given polygon