| 1 | "use strict";
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| 2 |
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| 3 | Object.defineProperty(exports, "__esModule", {
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| 4 | value: true
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| 5 | });
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| 6 | exports.Cardinal = Cardinal;
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| 7 | exports.default = void 0;
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| 8 | exports.point = point;
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| 9 | function point(that, x, y) {
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| 10 | that._context.bezierCurveTo(that._x1 + that._k * (that._x2 - that._x0), that._y1 + that._k * (that._y2 - that._y0), that._x2 + that._k * (that._x1 - x), that._y2 + that._k * (that._y1 - y), that._x2, that._y2);
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| 11 | }
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| 12 | function Cardinal(context, tension) {
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| 13 | this._context = context;
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| 14 | this._k = (1 - tension) / 6;
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| 15 | }
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| 16 | Cardinal.prototype = {
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| 17 | areaStart: function () {
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| 18 | this._line = 0;
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| 19 | },
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| 20 | areaEnd: function () {
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| 21 | this._line = NaN;
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| 22 | },
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| 23 | lineStart: function () {
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| 24 | this._x0 = this._x1 = this._x2 = this._y0 = this._y1 = this._y2 = NaN;
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| 25 | this._point = 0;
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| 26 | },
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| 27 | lineEnd: function () {
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| 28 | switch (this._point) {
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| 29 | case 2:
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| 30 | this._context.lineTo(this._x2, this._y2);
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| 31 | break;
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| 32 | case 3:
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| 33 | point(this, this._x1, this._y1);
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| 34 | break;
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| 35 | }
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| 36 | if (this._line || this._line !== 0 && this._point === 1) this._context.closePath();
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| 37 | this._line = 1 - this._line;
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| 38 | },
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| 39 | point: function (x, y) {
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| 40 | x = +x, y = +y;
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| 41 | switch (this._point) {
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| 42 | case 0:
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| 43 | this._point = 1;
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| 44 | this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y);
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| 45 | break;
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| 46 | case 1:
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| 47 | this._point = 2;
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| 48 | this._x1 = x, this._y1 = y;
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| 49 | break;
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| 50 | case 2:
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| 51 | this._point = 3;
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| 52 | // falls through
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| 53 | default:
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| 54 | point(this, x, y);
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| 55 | break;
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| 56 | }
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| 57 | this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
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| 58 | this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
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| 59 | }
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| 60 | };
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| 61 | var _default = exports.default = function custom(tension) {
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| 62 | function cardinal(context) {
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| 63 | return new Cardinal(context, tension);
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| 64 | }
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| 65 | cardinal.tension = function (tension) {
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| 66 | return custom(+tension);
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| 67 | };
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| 68 | return cardinal;
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| 69 | }(0); |
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