export function childrenOnChain()

in packages/maker.js/src/core/layout.ts [183:226]

• 29 lines of code
• 11 McCabe index (conditional complexity)

    export function childrenOnChain(parentModel: IModel, onChain: IChain, baseline = 0, reversed = false, contain = false, rotated = true) {
        var result = getChildPlacement(parentModel, baseline);
        var cpa = result.cpa;

        var chainLength = onChain.pathLength;
        if (contain) chainLength -= result.firstX + result.lastX;

        var absolutes = cpa.map(cp => (reversed ? 1 - cp.xRatio : cp.xRatio) * chainLength);
        var relatives: number[];

        if (reversed) absolutes.reverse();

        relatives = absolutes.map((ab, i) => Math.abs(ab - (i == 0 ? 0 : absolutes[i - 1])));

        if (contain) {
            relatives[0] += reversed ? result.lastX : result.firstX;
        } else {
            relatives.shift();
        }

        //chain.toPoints always follows the chain in its order, from beginning to end. This is why we needed to contort the points input
        var points = chain.toPoints(onChain, relatives);

        if (points.length < cpa.length) {
            //add last point of chain, since our distances exceeded the chain
            var endLink = onChain.links[onChain.links.length - 1];
            points.push(endLink.endPoints[endLink.reversed ? 0 : 1]);
        }

        if (contain) points.shift(); //delete the first point which is the beginning of the chain

        if (reversed) points.reverse();

        var angles = miterAngles(points, -90);

        cpa.forEach((cp, i) => {
            cp.angle = angles[i];
            cp.origin = points[i];
        });

        moveAndRotate(parentModel, cpa, rotated);

        return parentModel;
    }