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master 97133fb3d0: Document the representation of DX and DY in pinch eve
From: |
Po Lu |
Subject: |
master 97133fb3d0: Document the representation of DX and DY in pinch events |
Date: |
Sun, 26 Dec 2021 06:01:46 -0500 (EST) |
branch: master
commit 97133fb3d0ae59e391a94c6189719318cb44a232
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>
Document the representation of DX and DY in pinch events
* doc/lispref/commands.texi (Misc Events): Document
the precise meaning of DX and DY in pinch events.
---
doc/lispref/commands.texi | 3 +++
1 file changed, 3 insertions(+)
diff --git a/doc/lispref/commands.texi b/doc/lispref/commands.texi
index dd36bace18..bfb1f5a947 100644
--- a/doc/lispref/commands.texi
+++ b/doc/lispref/commands.texi
@@ -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
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