getObjectPosition(id, originX, originY) {
    return this._graphics.getObjectPosition(id, originX, originY);
  }
Get object position by originX, originY
@param {number} id - object id
@param {string} originX - can be 'left', 'center', 'right'
@param {string} originY - can be 'top', 'center', 'bottom'
@returns {Object} {{x:number, y: number}} position by origin if id is valid, or null
@example
var position = imageEditor.getObjectPosition(id, 'left', 'top');
console.log(position);