Limiting the range of panning with the camera?

[Holocene]

Hi,

I'd like to limit how far the user can pan the camera with sigma. Right now, the user can drag with their mouse so that the graph goes off screen - I'd like to stop the user from panning any further once there are no more nodes for them to see.

I found the functionsigma.utils.getBoundaries that tells me the maximum size in the graph's reference frame. For my graph, these are the values:

maxX: 220.891779987076
maxY: 61.83015864512595
minX: -53.77542585542745
minY: -58.27287883796339

I thought then to go edit the goTo method on the camera class, like this:

if (coordinates.x < bounds.minX) coordinates.x = bounds.minX;
if (coordinates.y < bounds.minY) coordinates.y = bounds.minY;
if (coordinates.x > bounds.maxX) coordinates.x = bounds.maxX;
if (coordinates.y > bounds.maxY) coordinates.y = bounds.maxY;

However, the coordinates here are from the coordinate space of the camera rather than of the graph, and I don't know how to change graph coordinates to camera coordinates. I expected to be able to find how to do this somewhere in the code, but after a few hours searching I can't seem to work it out. I tried using the cameraPosition and graphPosition methods, but they give unexpected results. How do I change graph coordinates to camera coordinates?

Do you have a suggestion on where I could look?

[Holocene]

Huh, I managed to find the trick after a bit more looking: I called the getBoundaries function with the relevant read parameter:

sigma.utils.getBoundaries(this.graph,'read_cam0:',true);

and it all worked out after that.