Thanks Mehmet - I see some study coming my way :)
On 18/1/22 6:47 pm, Mehmet Erol Sanliturk wrote:
On Tue, Jan 18, 2022 at 7:22 AM Steve Gatenby via lazarus
<lazarus@lists.lazarus-ide.org <mailto:lazarus@lists.lazarus-ide.org>>
wrote:
Thank you Mehmet -
Tried to follow the math within the svg (inkscape) on my first
attempt(s)
got completely lost (which leads to questioning ones intelligence)
on the transforms, scales and differing units :)
So now fully fudging it by dividing the Svg source Height and
Width by a grid format and call each one a quadrant location (x,y).
Then do the same with the OnClick position of the viewer (so
relative quadrants / sizes), and find closest matching (for me)
object. All depends on granularity of grid for accuracy.
Works, but is very dependent on complexity of the svg (not a
problem for my use case so far)
My primary profession was "Elementary School Teacher" . In our
profession ,
determiner factor is not intelligence ( because everyone virtually has
sufficient amount of it )
but "work with respect to scientific principles , continuous efforts
, knowledge of the subject" . Please do not blame yourself with
respect to intelligence .
Later on I went to the Middle East Technical University ( Ankara ,
Turkey ) to be a
( Mathematician , Computer Expert , a Good Manager of Money ( I have
never been able
to earn sufficient money to manage other than my monthly salaries )) ,
and then an
instructor in another University ( Hacettepe ) . Always my emphasized
point to my
students and nearly every other one around me was the principle :
"Not intelligence , but sufficient study and work" .
My opinion is that you also need sufficient study and work , not
intelligence because
it is easily understandable that you have plenty of it .
You may see the following page and its associated subpages leading you to
"Computer Graphics" books if you think you need to review or learn
subjects about
it .
https://en.wikipedia.org/wiki/Category:Computer_graphics
<https://en.wikipedia.org/wiki/Category:Computer_graphics>
Category:Computer graphics
And also useful ( more ) pages ...
https://en.wikipedia.org/wiki/Category:Communication_design
<https://en.wikipedia.org/wiki/Category:Communication_design>
Category:Communication design
https://en.wikipedia.org/wiki/Category:Information_visualization
<https://en.wikipedia.org/wiki/Category:Information_visualization>
Category:Information visualization
https://en.wikipedia.org/wiki/Category:Visualization_(graphic)
<https://en.wikipedia.org/wiki/Category:Visualization_(graphic)>
Category:Visualization (graphic)
.
.
.
This means that your problem is not so easy to handle as seen from a
distant point .
With my best wishes for all ,
Mehmet Erol Sanliturk
On 18/1/22 9:53 am, Mehmet Erol Sanliturk wrote:
On Tue, Jan 18, 2022 at 2:37 AM Steve Gatenby via lazarus
<lazarus@lists.lazarus-ide.org
<mailto:lazarus@lists.lazarus-ide.org>> wrote:
Thanks Marc - seems I will need to stick with what I have then.
Currently I am pulling all object info from the SVG into an
array and
assigning quadrant positions.
Then do best guess by relative quadrant of mouse click
position - works
fine, but feels sloppy :)
If it is feasible for you , you may do the following :
In an array of a record , define approximate "bounding boxes" of your
SVG graphic ( You may generate a "bounding box" array conforming
to the given SVG ) .
In the "bounding box" array record , you may define a pointer
showing the SVG object .
When a mouse click is obtained , you may search "bounding box"
array and
if it is related with an element of the SVG , from it you reach
to the SVG element and
do whatever you want to do with it .
https://en.wikipedia.org/wiki/Minimum_bounding_box
<https://en.wikipedia.org/wiki/Minimum_bounding_box>
Minimum bounding box
( Please see attached pages . )
This idea may be considered as an alternative view which I can
not say that
it is very suitable for you . Only you may decide its usefulness .
Mehmet Erol Sanliturk
On 17/1/22 8:55 pm, Marc Weustink via lazarus wrote:
> I'm afraid there is no easy solution for that. SVGs are
rendered from
> the first element to the last, where ever element (atleast
in theory)
> can be a part of a given pixel. SVG elements do have a
> x,y,width,height but they may also be part of one or more
> transformations.
> To give you an idea, the (browser)app I'm currently working on
> displays several object, where every object has an
origin(x,y) of 0,0
> and they are finally placed by translations.
> The easiest way (if you are in a browser context) is to add
an onclick
> handler to your elements of interest.
>
> Marc
>
>
>
> On 16-1-2022 23:34, Steve Gatenby via lazarus wrote:
>> Not sure if this is the right place to ask about this one -
>>
>> I am using the BCSVGViewer from bgra controls - for SVG
viewing
>> obviously :)
>>
>> Would anybody know if there is a method to retrieve the
object
>> (within the svg) at specified x,y ?
>>
>> or is it possible to use embedded links within the svg ?
>>
>> I am looking to find which object has been clicked on
within the svg
>> to create a 'clickable' map
>>
>> Any suggestions on a better place to post this also
appreciated
>>
>> Regards SteveG
>>
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