Function _resolveTarget

src/plugins/plugin.filler/filler.options.js:10–39

(sources, index, propagate)

 */

export function _resolveTarget(sources, index, propagate) {
  const source = sources[index];
  let fill = source.fill;
  const visited = [index];
  let target;

  if (!propagate) {
    return fill;
  }

  while (fill !== false && visited.indexOf(fill) === -1) {
    if (!isFinite(fill)) {
      return fill;
    }

    target = sources[fill];
    if (!target) {
      return false;
    }

    if (target.visible) {
      return fill;
    }

    visited.push(fill);
    fill = target.fill;
  }

  return false;
}

/**
 * @param {LineElement} line