On Tue, 29 Mar 2022, Werner Pamler wrote:
Am 29.03.2022 um 18:37 schrieb Michael Van Canneyt:
So you must always register the three images.
You are not forced to. But when you provide only the standard size and run
the IDE at 200% the IDE will upscale the 24x24 image to double size, and the
icon will become blurry - just as it was in the days before Ondrej
implemented all these scaling functions. (BTW: a long time before Delphi
which seems to support High-Dpi only now in the recent release).
OK, thank you.
As a corollary: what's with the strange names ?
Why not use the size of the icon in the name, that would be a lot
clearer IMHO?
That's the way it was decided. One advantage is that when images are
needed for other purposes, but at different sizes (e.g. the icons in the
message window which are much smaller) the scaling procedure can still be
the same
Not sure I follow the logic ?
I don't know the actual procedure names ATM, but imagine that when the
message window needs a "warning" icon (which is - say - 12x12 at 96ppi) then
the scaling procedure at 192ppi only needs to look for "warning_200.png". If
the exact image size would have been included in the file name instead
("warning_24x24.png"), it would have to know the size of the base image at
96ppi in order to select the right image. A little simplification.
I fail to see the link between 192 and 200. This requires people to know
that 96dpi and 144 dpi and 192 dpi are 100, 150 and 200 % of a standard size.
For me - and I've been in IT for quite some time now - this is far from
obvious that this should result in 24x24, 36x36 and 48x48 icon sizes.
In short: I think this is a horribly contorted scheme.
All other systems I came across simply use icon dimensions in the name.
Far simpler and hence preferable in my opinion.
I looked in the WIKI but could not find any relevant info.
https://wiki.lazarus.freepascal.org/How_To_Write_Lazarus_Component#Step_3%3A_Create_icons_for_the_package
Hehe, the history shows you sneaked in the different sizes today. I checked
only last week, so I was pretty sure the info was outdated ;-)
I had written this part of the wiki already in 2018, so it definitely was not
outdated. I just noticed that it was missing some basic requirements (like
component name = image name) and decided to rewrite the paragraph.
the 3 sizes were not mentioned when last I looked ?
OK, I will look at the SVG files. It didn't occur to me I can remove the
text. Or possibly simply change it to what I need.
I am attaching the three "database" png images extracted from the TDbf svgs
without the text, in case you have problems with InkScape (which definitely
will not win the prize of the most user-friendly software).
Well, I managed to get something working with Inkscape.
I already committed TJSONDataset.
(for which, strangely enough, there was already an image)
Thank you for all explanations.
Michael.
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