geometry.js

/**
 * Geometry helpers
 */

import create from './create.js';

// fake node used to instantiate svg geometry elements
var node = null;

function getNode() {
  if (node === null) {
    node = create('svg');
  }

  return node;
}

function extend(object, props) {
  var i, k, keys = Object.keys(props);

  for (i = 0; (k = keys[i]); i++) {
    object[k] = props[k];
  }

  return object;
}


export function createPoint(x, y) {
  var point = getNode().createSVGPoint();

  switch (arguments.length) {
  case 0:
    return point;
  case 2:
    x = {
      x: x,
      y: y
    };
    break;
  }

  return extend(point, x);
}

/**
 * Create matrix via args.
 *
 * @example
 *
 * createMatrix({ a: 1, b: 1 });
 * createMatrix();
 * createMatrix(1, 2, 0, 0, 30, 20);
 *
 * @return {SVGMatrix}
 */
export function createMatrix(a, b, c, d, e, f) {
  var matrix = getNode().createSVGMatrix();

  switch (arguments.length) {
  case 0:
    return matrix;
  case 1:
    return extend(matrix, a);
  case 6:
    return extend(matrix, {
      a: a,
      b: b,
      c: c,
      d: d,
      e: e,
      f: f
    });
  }
}

export function createTransform(matrix) {
  if (matrix) {
    return getNode().createSVGTransformFromMatrix(matrix);
  } else {
    return getNode().createSVGTransform();
  }
}