With these three simple functions, you've now added the ability to let the user dragaround the image, panning it regardless of its zoom level.
通过这三个简单的函数，你已经添加了让用户拖动图片的功能了，拖动图片而不需要考虑图片的缩放基本。
2
Novice users can easily drag elements around the diagram to change the order of the data elements in the schema.
新手可以轻松地在图上拖动元素，从而改变数据元素在模式中的次序。
3
Some of us just don’t like to hold the umbrellas in the hands when nolonger using them, and they prefer to drag them around…until theumbrellas are totally broken as a result.