utils.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.range = range;
exports.clamp = clamp;
exports.getTouchPosition = getTouchPosition;
exports.getTouchId = getTouchId;
exports.omit = omit;
exports.modCursor = modCursor;

function range(start, end) {
  var ret = [];

  for (var i = start; i <= end; i++) {
    ret.push(i);
  }

  return ret;
}

function clamp(n, min, max) {
  if (n < min) {
    return min;
  }

  if (n > max) {
    return max;
  }

  return n;
}

function getTouchPosition(e) {
  return {
    x: e.changedTouches[0].pageX,
    y: e.changedTouches[0].pageY
  };
}

function getTouchId(e) {
  return e.changedTouches[0].identifier;
}

function omit(obj, keys) {
  var ret = {};
  Object.keys(obj).forEach(function (k) {
    if (keys.includes(k)) return;
    ret[k] = obj[k];
  });
  return ret;
}

function modCursor(cursor, cardCount) {
  var newCursor = cursor;

  while (newCursor > 0) {
    newCursor -= cardCount;
  }

  while (newCursor < 0.5 - cardCount) {
    newCursor += cardCount;
  }

  return newCursor;
}