Has anyone built a widget, or is there a quick and easy way to build a widget that would allow the display of the phase angle relationship of a 3-phase electrical circuit?

You can create a calculation of this and set it as a property of an object's rotation angle and/or link it to text. Setting the rotation angle to a tag might require you to open the page script as I'm not sure that is avaliable using the object settings.

If you need help on this, let us know how you'd like it to look and we can suggest some snippets to help.

Pretty new to VTScada. (Only a couple weeks in) The main difficulty I am having (though I'll probably find others) is getting a rotation on the end of a line rather than in the center. The diagram would look like this:

I have a tag for each phase that is its angle, but I don't know how to configure it to rotate on the end of a line.
Note: The lines of the chart aren't necessary but would be nice. :-)

I think the easiest solution to make the rotation about the middile of the line is to make the line graphic such that the start of the line is in the middle of the line graphic.

As an alternative, VTScada has widget components in the graphics library which include some options for dial indicators. You can recolor the built-in graphics so that each phase indicator appears unique.