From: Eli Zaretskii <eliz@gnu.org>
To: Joseph Turner <joseph@breatheoutbreathe.in>
Cc: 69602@debbugs.gnu.org, stephen.berman@gmx.net, juri@linkov.net
Subject: bug#69602: 29.1; Image :map should adjust with :scale and :rotation
Date: Thu, 07 Mar 2024 09:04:06 +0200 [thread overview]
Message-ID: <86jzmejzfd.fsf@gnu.org> (raw)
In-Reply-To: <87msramv72.fsf@breatheoutbreathe.in> (bug-gnu-emacs@gnu.org)
> Cc: Stephen Berman <stephen.berman@gmx.net>, Juri Linkov <juri@linkov.net>
> Date: Wed, 06 Mar 2024 21:37:50 -0800
> From: Joseph Turner via "Bug reports for GNU Emacs,
> the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>
> Currently, when running `image-increase-size' or `image-decrease-size'
> on an image with a :map property, the image scales but the image map
> does not. For example, run the following snippet:
>
> (with-current-buffer (get-buffer-create "*image-properties-test*")
> (let ((svg "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"\n \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n<!-- Generated by graphviz version 2.43.0 (0)\n -->\n<!-- Title: orggraphview Pages: 1 -->\n<svg width=\"128pt\" height=\"128pt\"\n viewBox=\"0.00 0.00 127.59 127.59\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n<g id=\"graph0\" class=\"graph\" transform=\"scale(1 1) rotate(0) translate(4 123.59)\">\n<title>orggraphview</title>\n<polygon fill=\"white\" stroke=\"transparent\" points=\"-4,4 -4,-123.59 123.59,-123.59 123.59,4 -4,4\"/>\n<!-- a -->\n<g id=\"node1\" class=\"node\">\n<title>a</title>\n<g id=\"a_node1\"><a xlink:href=\"1\" xlink:title=\"Hover me!\">\n<ellipse fill=\"none\" stroke=\"black\" cx=\"59.79\" cy=\"-59.79\" rx=\"59.59\" ry=\"59.59\"/>\n<text text-anchor=\"middle\" x=\"59.79\" y=\"-56.09\" font-family=\"Times,serif\" font-size=\"14.00\" fill=\"#000000\">Hover me!</text>\n</a>\n</g>\n</g>\n</g>\n</svg>\n")
> (map '(((circle (85 . 85) . 80) "1" (help-echo "Surprise!"))))
> (inhibit-read-only t))
> (erase-buffer)
> (insert-image (create-image svg 'svg t :map map))
> (goto-char (point-min))
> (pop-to-buffer (current-buffer))))
>
> Hovering the circle alters the pointer style and displays the tooltip.
>
> Now run `M-x image-increase-size' or press "i +". While the image
> becomes larger, the area which activates the tooltip remains the same.
>
> See earlier discussion here:
>
> https://yhetil.org/emacs-devel/87r0gng41l.fsf@ushin.org/T/#t
>
> While a proper solution perhaps belongs on the C side, the following
> workaround adds an :unscaled-map property to images and sets :map
> according to :unscaled-map and :scale whenever :scale changes.
The ELisp manual says about :map:
Note that the map's coordinates should reflect the displayed image
after all transforms have been done (rotation, scaling and so on),
and also note that Emacs (by default) performs auto-scaling of
images, so to make things match up, you should either specify
‘:scale 1.0’ when creating the image, or use the result of
‘image-compute-scaling-factor’ to compute the elements of the map.
Can this technique help?
next prev parent reply other threads:[~2024-03-07 7:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-07 5:37 bug#69602: 29.1; Image :map should adjust with :scale and :rotation Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-07 7:04 ` Eli Zaretskii [this message]
2024-03-07 7:14 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-07 7:55 ` Eli Zaretskii
2024-03-07 8:08 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-07 9:27 ` Eli Zaretskii
2024-03-07 13:53 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-08 7:02 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-08 8:31 ` Eli Zaretskii
2024-03-08 8:39 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-08 11:50 ` Eli Zaretskii
2024-03-21 6:45 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-21 11:59 ` Eli Zaretskii
2024-03-23 0:11 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-23 7:58 ` Eli Zaretskii
2024-03-23 17:41 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-23 17:58 ` Eli Zaretskii
2024-03-23 18:18 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-23 20:32 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-28 10:13 ` Eli Zaretskii
2024-03-08 7:24 ` Eli Zaretskii
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