SVGOverlay supports getLatLng/setLatLng methods for Tooltip/Popup bound.

[zxh19890103]

In my actual project, I use SVGOverlay to display an object needing tooltip support. But I found that tooltip tries accessing SVGOverlay method getLatLng which is not there. There is just getLatLngBounds method for those layers owning a region on map. But I hope even these layers would have getLatLng method which returns the center coordinates, or top/bottom/left/right border line's middle coordinates by an option given by users.

For setLatLng, it's function is to move the layer without changing the size of it.

[johnd0e]

Thanks for taking the time to open an issue!
Please provide a general summary of the issue in the title above .

• I've looked at the documentation to make sure the behavior is documented and expected
• I'm sure this is a Leaflet code issue, not an issue with my own code nor with the framework I'm using (Cordova, Ionic, Angular, React…)
• I've searched through the issues to make sure it's not yet reported

Steps to reproduce
Steps to reproduce the behavior:

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• step 2
• ...

Expected behavior

Current behavior

Environment

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Additional context

Minimal example reproducing the issue

Please create an example using https://leafletjs.com/edit.html or any other jsfiddle-like site.

• this example is as simple as possible
• this example does not rely on any third party code

[zxh19890103]

const svg = new L.SVGOverlay(bounds).bindPopup('some words');

// later

svg.openPopup(); // This will throw an error.

svg.openPopup(L.latlng(0, 0)); // This works well.

bingTooltip is similar with popup.

My solution:

const MySvgOverlay = L.SVGOverlay.extend({
  getLatLng() {
    return computesCenterLatLng();
  }
}) as any;

[Falke-Design]

Sample: https://plnkr.co/edit/KIHCpqTs1JDRyTZZ

Stacktrace:

Uncaught Error: Unable to get source layer LatLng.
    _prepareOpen DivOverlay.js:181
    openPopup Popup.js:421

[Falke-Design]

This is already fixed by #7306 and #7540 in the newest master. But I created the PR #7848 to add getCenter function to the ImageOverlay and SVGOverlay.