Function isDisplayable

src/chart/custom/CustomView.ts:189–191

(el: Element)

    return el instanceof graphicUtil.Path;
}
function isDisplayable(el: Element) : el is Displayable {
    return el instanceof Displayable;
}
function copyElement(sourceEl: Element, targetEl: Element) {
    targetEl.copyTransform(sourceEl);
    if (isDisplayable(targetEl) && isDisplayable(sourceEl)) {