import { CpNode } from "../cp-node.js";
import { isTerminating } from "./is-terminating.js";


/**
 * Similar to `getChildren` but returns the child nodes of the tree when 
 * `CpNode` is seen as a MAT vertex point (as opposed to edge). In this 
 * way the dual graph of the tree can easily be traversed - see e.g. 
 * `traverseVertices`. Generally, however, traversing the edges is 
 * preferred as it returns the entire Medial Axis (by utilizing 
 * `getMatCurveToNext` on each returned edge).
 */
function getVertexForwardChildren(cpNode: CpNode) {
    const children: CpNode[] = [];

    const cpStart = cpNode;

    let cpNode_ = cpStart;
    while (cpNode_ !== cpStart.prevOnCircle) {
        if (!isTerminating(cpNode_)) {
            children.push(cpNode_.next);
        }
        cpNode_ = cpNode_.nextOnCircle;
    }

    return children;
}


export { getVertexForwardChildren }