chuYinKouXian/localEarth/js/common/utils.js

import d3 from 'd3';

// adapted from memoize.js by @philogb and @addyosmani
export function memoize(fn) {
  return function () {
    var args = Array.prototype.slice.call(arguments);

    var key = "", len = args.length, cur = null;

    while (len--) {
      cur = args[len];
      key += (cur === Object(cur))? JSON.stringify(cur): cur;

      fn.memoize || (fn.memoize = {});
    }

    return (key in fn.memoize)? fn.memoize[key]:
    fn.memoize[key] = fn.apply(this, args);
  };
}

export function debounce(func, wait, immediate) {
  var timeout;
  return function() {
    var context = this, args = arguments;
    var later = function() {
      timeout = null;
      if (!immediate) {
        func.apply(context, args);
      }
    };
    var callNow = immediate && !timeout;
    clearTimeout(timeout);
    timeout = setTimeout(later, wait);
    if (callNow) {
      func.apply(context, args);
    }
  };
}

export var getTween = function (prop, to, time) {
  time = time || 500;
  var node = this;
  var curr = node[prop];
  var interpol = d3.interpolateObject(curr, to);
  return function (t) {
    node[prop].copy(interpol(t / time));
    if (t >= time) {
      return true;
    }
  };
};