node-d3-path 1.0.5-3 / usr / lib / nodejs / d3-path / build / d3-path.js

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		exports["d3"] = factory();
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		root["d3"] = factory();
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/* 0 */
/***/ (function(module, exports, __webpack_require__) {

"use strict";


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

var _path = __webpack_require__(1);

Object.defineProperty(exports, "path", {
  enumerable: true,
  get: function get() {
    return _interopRequireDefault(_path).default;
  }
});

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

/***/ }),
/* 1 */
/***/ (function(module, exports, __webpack_require__) {

"use strict";


Object.defineProperty(exports, "__esModule", {
  value: true
});
var pi = Math.PI,
    tau = 2 * pi,
    epsilon = 1e-6,
    tauEpsilon = tau - epsilon;

function Path() {
  this._x0 = this._y0 = // start of current subpath
  this._x1 = this._y1 = null; // end of current subpath
  this._ = "";
}

function path() {
  return new Path();
}

Path.prototype = path.prototype = {
  constructor: Path,
  moveTo: function moveTo(x, y) {
    this._ += "M" + (this._x0 = this._x1 = +x) + "," + (this._y0 = this._y1 = +y);
  },
  closePath: function closePath() {
    if (this._x1 !== null) {
      this._x1 = this._x0, this._y1 = this._y0;
      this._ += "Z";
    }
  },
  lineTo: function lineTo(x, y) {
    this._ += "L" + (this._x1 = +x) + "," + (this._y1 = +y);
  },
  quadraticCurveTo: function quadraticCurveTo(x1, y1, x, y) {
    this._ += "Q" + +x1 + "," + +y1 + "," + (this._x1 = +x) + "," + (this._y1 = +y);
  },
  bezierCurveTo: function bezierCurveTo(x1, y1, x2, y2, x, y) {
    this._ += "C" + +x1 + "," + +y1 + "," + +x2 + "," + +y2 + "," + (this._x1 = +x) + "," + (this._y1 = +y);
  },
  arcTo: function arcTo(x1, y1, x2, y2, r) {
    x1 = +x1, y1 = +y1, x2 = +x2, y2 = +y2, r = +r;
    var x0 = this._x1,
        y0 = this._y1,
        x21 = x2 - x1,
        y21 = y2 - y1,
        x01 = x0 - x1,
        y01 = y0 - y1,
        l01_2 = x01 * x01 + y01 * y01;

    // Is the radius negative? Error.
    if (r < 0) throw new Error("negative radius: " + r);

    // Is this path empty? Move to (x1,y1).
    if (this._x1 === null) {
      this._ += "M" + (this._x1 = x1) + "," + (this._y1 = y1);
    }

    // Or, is (x1,y1) coincident with (x0,y0)? Do nothing.
    else if (!(l01_2 > epsilon)) {}

      // Or, are (x0,y0), (x1,y1) and (x2,y2) collinear?
      // Equivalently, is (x1,y1) coincident with (x2,y2)?
      // Or, is the radius zero? Line to (x1,y1).
      else if (!(Math.abs(y01 * x21 - y21 * x01) > epsilon) || !r) {
          this._ += "L" + (this._x1 = x1) + "," + (this._y1 = y1);
        }

        // Otherwise, draw an arc!
        else {
            var x20 = x2 - x0,
                y20 = y2 - y0,
                l21_2 = x21 * x21 + y21 * y21,
                l20_2 = x20 * x20 + y20 * y20,
                l21 = Math.sqrt(l21_2),
                l01 = Math.sqrt(l01_2),
                l = r * Math.tan((pi - Math.acos((l21_2 + l01_2 - l20_2) / (2 * l21 * l01))) / 2),
                t01 = l / l01,
                t21 = l / l21;

            // If the start tangent is not coincident with (x0,y0), line to.
            if (Math.abs(t01 - 1) > epsilon) {
              this._ += "L" + (x1 + t01 * x01) + "," + (y1 + t01 * y01);
            }

            this._ += "A" + r + "," + r + ",0,0," + +(y01 * x20 > x01 * y20) + "," + (this._x1 = x1 + t21 * x21) + "," + (this._y1 = y1 + t21 * y21);
          }
  },
  arc: function arc(x, y, r, a0, a1, ccw) {
    x = +x, y = +y, r = +r;
    var dx = r * Math.cos(a0),
        dy = r * Math.sin(a0),
        x0 = x + dx,
        y0 = y + dy,
        cw = 1 ^ ccw,
        da = ccw ? a0 - a1 : a1 - a0;

    // Is the radius negative? Error.
    if (r < 0) throw new Error("negative radius: " + r);

    // Is this path empty? Move to (x0,y0).
    if (this._x1 === null) {
      this._ += "M" + x0 + "," + y0;
    }

    // Or, is (x0,y0) not coincident with the previous point? Line to (x0,y0).
    else if (Math.abs(this._x1 - x0) > epsilon || Math.abs(this._y1 - y0) > epsilon) {
        this._ += "L" + x0 + "," + y0;
      }

    // Is this arc empty? We’re done.
    if (!r) return;

    // Does the angle go the wrong way? Flip the direction.
    if (da < 0) da = da % tau + tau;

    // Is this a complete circle? Draw two arcs to complete the circle.
    if (da > tauEpsilon) {
      this._ += "A" + r + "," + r + ",0,1," + cw + "," + (x - dx) + "," + (y - dy) + "A" + r + "," + r + ",0,1," + cw + "," + (this._x1 = x0) + "," + (this._y1 = y0);
    }

    // Is this arc non-empty? Draw an arc!
    else if (da > epsilon) {
        this._ += "A" + r + "," + r + ",0," + +(da >= pi) + "," + cw + "," + (this._x1 = x + r * Math.cos(a1)) + "," + (this._y1 = y + r * Math.sin(a1));
      }
  },
  rect: function rect(x, y, w, h) {
    this._ += "M" + (this._x0 = this._x1 = +x) + "," + (this._y0 = this._y1 = +y) + "h" + +w + "v" + +h + "h" + -w + "Z";
  },
  toString: function toString() {
    return this._;
  }
};

exports.default = path;
module.exports = exports["default"];

/***/ })
/******/ ]);
});