ClosedCurve.js

import Plot from './Plot'
import PlotTypes from '../PlotTypes'
import PolygonOL from 'ol/geom/Polygon'
import mix from '../../util/mixin'
import * as PlotUtils from '../utils/plot_util'
import Constants from '../Constants'

export default class ClosedCurve extends mix(Plot, PolygonOL) {

    constructor(points) {
        super(points);
        this.type = PlotTypes.CLOSED_CURVE;
        this.t = 0.3;
        this.setPoints(points);
    }
    generate() {
        var count = this.getPointCount();
        if (count < 2) {
            return;
        }
        if (count == 2) {
            this.setCoordinates([this.points]);
        }
        else {
            var pnts = this.getPoints();
            pnts.push(pnts[0], pnts[1]);
            var normals = [];
            for (var i = 0; i < pnts.length - 2; i++) {
                var normalPoints = PlotUtils.getBisectorNormals(this.t, pnts[i], pnts[i + 1], pnts[i + 2]);
                normals = normals.concat(normalPoints);
            }
            var count = normals.length;
            normals = [normals[count - 1]].concat(normals.slice(0, count - 1));

            var pList = [];
            for (i = 0; i < pnts.length - 2; i++) {
                var pnt1 = pnts[i];
                var pnt2 = pnts[i + 1];
                pList.push(pnt1);
                for (var t = 0; t <= Constants.FITTING_COUNT; t++) {
                    var pnt = PlotUtils.getCubicValue(t / Constants.FITTING_COUNT, pnt1, normals[i * 2], normals[i * 2 + 1], pnt2);
                    pList.push(pnt);
                }
                pList.push(pnt2);
            }
            this.setCoordinates([pList]);
        }
    }


}