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help: Write intial help documentation

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Part-of: <https://gitlab.gnome.org/GNOME/Incubator/loupe/-/merge_requests/248>
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Christopher Davis 2023-06-30 12:24:39 -04:00 • committed by Marge Bot
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= Viewing Images
[topic]
@link[guide >index#getting-started]
@desc Learn how to view an image at different scales and orientations.
== Zooming
Users can zoom in with the $gui(Zoom In) ($media[type="image" src="figures/zoom-in-symbolic.svg"](zoom-in-symbolic))
button and zoom out with the $gui(Zoom Out) ($media[type="image" src="figures/zoom-out-symbolic.svg"](zoom-out-symbolic))
button. They can also use the following keyboard shortcuts:
* $keyseq($key(Ctrl)$key(+)) or $key(+) to zoom in.
* $keyseq($key(Ctrl)$key(-)) or $key(-) to zoom out.
* $keyseq($key(Ctrl)$key(0)) or $key(0) to zoom to the best fitting size for the window size.
* $keyseq($key(Ctrl)$key(1)) or $key(1) to zoom to the image's original scale.
* $keyseq($key(Ctrl)$key(2)) or $key(2) to zoom to 200% of the image's original scale.
Touchpad and touchscreen users can also zoom with a two-finger pinch gesture.
== Panning
Mouse and touchpad users can pan the view when zoomed in by clicking and dragging the image.
Touchscreen users can use a single-finger drag gesture to pan the view. Users with a keyboard
can also use the following keyboard shortcuts:
* $keyseq($key(Ctrl)$key(←)) to pan left.
* $keyseq($key(Ctrl)$key(→)) to pan right.
* $keyseq($key(Ctrl)$key(↑)) to pan up.
* $keyseq($key(Ctrl)$key(↓)) to pan down.
== Rotating
Users can use the $gui(Rotate Right) ($media[type="image" src="figures/object-rotate-right-symbolic.svg"](object-rotate-right-symbolic))
and $gui(Rotate Left) ($media[type="image" src="figures/object-rotate-left-symbolic.svg"](object-rotate-left-symbolic))
buttons under $gui[style="menuitem"](Rotate) in the main menu to rotate clockwise and
counter-clockwise. They can also use the following keyboard shortcuts:
* $keyseq($key(Ctrl)$key(R)) to rotate clockwise.
* $keyseq($key(Ctrl)$key(Shift)$key(R)) to rotate counter-clockwise.
Touchpad and touchscreen users can also use a two-finger rotate gesture.
== Fullscreen
Loupe has a simple fullscreen mode. Users can toggle fullscreen mode by pressing the $gui(Toggle Fullscreen)
($media[type="image" src="figures/view-fullscreen-symbolic.svg"](view-fullscreen-symbolic) / $media[type="image" src="figures/view-restore-symbolic.svg"](view-restore-symbolic)) button.
Keyboard users can also use $key(F11) to toggle fullscreen mode.