Get Element ID from Click

[yodamiit]

Hi all!
I'm using TBCSVGViewer to show SVG image.
Maybe there is some way to Get SVG Element ID which was clicked?

[MarkMLl]

Noting that you're a new member of the forum and welcome :-)

I suspect that the lack of response is not because people aren't interested, but because you're the local expert in this field.

From experience with things like Inkscape (and predecessor software over many years), I'd suggest that the obvious problem with SVG is that once you've got a fully-rendered image it can be very difficult to detect what's actually been clicked. A useful approach might be to first find a way to present the elements in sequence: either in the order presented in the file or by trying to work out which elements occlude others.

MarkMLl

[circular]

Hello yodamiit,

Your question is clear. What would be convenient for you is a function in TBCSVGViewer component to detect which SVG element is at a certain position. This component relies on TBGRASVG class of BGRABitmap, which does not have this feature yet.

One way to implement such feature would be to implement something similar as the recursive Draw functions, except that instead of rendering the elements, it would check if a point is in the current shape. This is not trivial to implement, in particular when it comes to checking for each individual SVG shape. One way to avoid having to rewrite the InternalDraw methods would be to mock the TBGRACanvas2D objet to replace the drawing functions by the checking functions and pass this mock object as a parameter of the InternalDraw methods of the SVG shapes.

Regards