I'm trying to understand how the "arc" is being calculated. I can make sense of something like the "fibonacci circle", I see how this depends on your screen resolution and/or scaling of the chart, hence when you change the scale of your chart, the circles change...

However, with the "arc", the scale of the chart does not affect it, so I don't understand how it decides to draw the arc, given that you only provide a start and endpoint. I assume the start and endpoint represent a cord of some circle, but there are an infinite number of circles that could be drawn with that cord somewhere on there, so how does ninja decide which circle to use? Are there some assumed parameters built into this? I've looked at the code for this, but since I am not a coder, it's not helping me visualize what's going on here...

Any hints much appreciated!

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