On Tue, Jan 18, 2022 at 7:22 AM Steve Gatenby via lazarus < 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 Category:Computer graphics And also useful ( more ) pages ... https://en.wikipedia.org/wiki/Category:Communication_design Category:Communication design https://en.wikipedia.org/wiki/Category:Information_visualization Category:Information visualization 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> 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 > 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 >> >> >> -- >> _______________________________________________ >> lazarus mailing list >> lazarus@lists.lazarus-ide.org >> https://lists.lazarus-ide.org/listinfo/lazarus >> > -- > _______________________________________________ > lazarus mailing list > lazarus@lists.lazarus-ide.org > https://lists.lazarus-ide.org/listinfo/lazarus >
-- _______________________________________________ lazarus mailing list lazarus@lists.lazarus-ide.org https://lists.lazarus-ide.org/listinfo/lazarus
