将两个 safari 都“接触”到来自手势事件？
我想获取 手势事件（gesturestart、gesturechange、gestureend）在移动 Safari（iOS：iPad）上/iPhone）。我知道手势*事件实际上并没有在事件参数中提供此信息，但我认为可能有一个“技巧”来获取此信息。在跟踪手势的同时获取手指的坐标（例如，以同一手势缩放和移动对象）会很棒。
这可以做到吗？
I want to get the position (relative or otherwise) of the two fingers/touches inside a gesture event (gesturestart, gesturechange, gestureend) on mobile Safari (iOS: iPad/iPhone). I know that the gesture* events don't actually provide this in the event args but i thought there might be a 'trick' to getting this info. It would be great to get the coords of the fingers while tracking a gesture (eg. scaling and moving an object in the same gesture).
Can this be done?
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事实证明，这些信息不能通过“手势”事件直接获得。
touch事件是关键，我能够获取触摸集合并使用前两次触摸来导出两组坐标的增量/中点。这似乎有效。It turns out that this information is not directly available via the 'gesture' events. The
touchevents are the key and i was able to get the touches collection and use the first two touches to derive a delta/midpoint of the two sets of coords. This seems to work.触摸事件的返回事件对象中有三个数组：
我不记得最初在哪里找到此信息，但快速 Google 搜索会显示 http://www.sitepen.com/blog/2008/07/10/touching-and-在 iPhone 上做手势/
明白了！ https://developer.apple.com/ Library/archive/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html 位于“处理多点触控事件”
There are three arrays in the returned event object for touch event:
I can't remember where I originally found this info, but a quick Google search brings up http://www.sitepen.com/blog/2008/07/10/touching-and-gesturing-on-the-iphone/
Got it! https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html Down at "Handling Multi-Touch Events"