@daign/2d-graphics/dist/lib/control-modifiers/followAlongModifier.js

Two dimensional graphics library that implements the daign-2d-pipeline.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.FollowAlongModifier = void 0;
/**
 * Follow along modifier.
 * The movement of the specified point is applied to all following points also.
 */
var FollowAlongModifier = /** @class */ (function () {
    /**
     * Constructor.
     */
    function FollowAlongModifier() {
        // Variable to temporarily disable the control modifier.
        this.enabled = true;
    }
    /**
     * Modify the position change that has been requested for a control object.
     * @param updatedPoints - The array of updated points.
     * @param pointIndex - The index of the point that initiated the change.
     * @param controlObject - The corresponding control object.
     * @returns The modified array of points.
     */
    FollowAlongModifier.prototype.modifyPoints = function (updatedPoints, pointIndex, controlObject) {
        if (!this.enabled) {
            return updatedPoints;
        }
        var pointBefore = controlObject.points.getElement(pointIndex);
        var pointAfter = updatedPoints[pointIndex];
        if (pointBefore) {
            // Difference between old and new position.
            var diff_1 = pointAfter.clone().sub(pointBefore);
            // Apply the same difference to all following points.
            var modifiedPoints = updatedPoints.map(function (point, index) {
                if (index > pointIndex) {
                    point.add(diff_1);
                }
                return point;
            });
            return modifiedPoints;
        }
        return updatedPoints;
    };
    return FollowAlongModifier;
}());
exports.FollowAlongModifier = FollowAlongModifier;