what's the different pinchstart | pinchend & pinchin | pinchout

[boomyao]

so many callback function that i don't know which one should i do ???

[paranoidjk]

The api is basicly as same as hammer.js.

They are in diffrent standpoint.

1. pinchstart / pinchmove / pinchend / pinchcancel is based on TouchEvent view, they are the low level api.

2. pinch in a uniform api, or a alias，both pinchstart / pinchmove / pinchend / pinchcancel will trigger pinch at the same time. It's just for convenient.

3. pinchin, pinchout is the top level api, which calculated the actually gesture behavior for users. pinchin means zoom out， pinchout means zoom in.