Polar plot through scientific-polar axis style

[jamesrswift]

Draft PR on the implementation of a plot that accepts polar coordinates. Achieved by drawing the axes, ticks, and grid manually, aswell as a custom transform.

It may be work rethinking how plots are created, as there's a good degree of refactorization that's possible here, something which will be even more true when other plot types are implemented (ternary diagrams, etc). Currently, the axis-style is truly independent from transformations, and its a bit hacky to get them to work together currently. A better way of doing it may be to give full control from the data viewport over to axes presets (which should probably then be renamed).

It would then make it trivial to implement plots that rely on weird transformations.

To do:

• Put the ticks on the angular axis
• Allow the phase of the angular axis to be adjusted
• Support logarithm transformations on radius? Not sure if thats possible
• Consider a better way of rendering the radial axis

[jamesrswift]

Current state:

[jamesrswift]

Converted to draft as this can be implemented more simply if a more aggressive refactor is undertaken first (in progress).