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Document the representation of DX and DY in pinch events

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* doc/lispref/commands.texi (Misc Events): Document
the precise meaning of DX and DY in pinch events.
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Po Lu 2021-12-26 19:00:33 +08:00
parent 2958d0ec49
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doc/lispref/commands.texi
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@ -2107,6 +2107,9 @@ the user placing two fingers on the touchpad, and ends with the user
removing those fingers. @var{dx}, @var{dy}, and @var{angle} will be
@code{0.0} in the first event sent after a sequence begins.
@var{dx} and @var{dy} are represented in imaginary units, in which
@code{1.0} is the width and height of the touchpad respectively.
@cindex @code{drag-n-drop} event
@item (drag-n-drop @var{position} @var{files})
This kind of event is generated when a group of files is