html2canvas/dist/npm/drawing/BezierCurve.js

Screenshots with JavaScript

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _Path = require('./Path');

var _Vector = require('./Vector');

var _Vector2 = _interopRequireDefault(_Vector);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var lerp = function lerp(a, b, t) {
    return new _Vector2.default(a.x + (b.x - a.x) * t, a.y + (b.y - a.y) * t);
};

var BezierCurve = function () {
    function BezierCurve(start, startControl, endControl, end) {
        _classCallCheck(this, BezierCurve);

        this.type = _Path.PATH.BEZIER_CURVE;
        this.start = start;
        this.startControl = startControl;
        this.endControl = endControl;
        this.end = end;
    }

    _createClass(BezierCurve, [{
        key: 'subdivide',
        value: function subdivide(t, firstHalf) {
            var ab = lerp(this.start, this.startControl, t);
            var bc = lerp(this.startControl, this.endControl, t);
            var cd = lerp(this.endControl, this.end, t);
            var abbc = lerp(ab, bc, t);
            var bccd = lerp(bc, cd, t);
            var dest = lerp(abbc, bccd, t);
            return firstHalf ? new BezierCurve(this.start, ab, abbc, dest) : new BezierCurve(dest, bccd, cd, this.end);
        }
    }, {
        key: 'reverse',
        value: function reverse() {
            return new BezierCurve(this.end, this.endControl, this.startControl, this.start);
        }
    }]);

    return BezierCurve;
}();

exports.default = BezierCurve;