
POLAR PICKER IMAGE
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Circular polar coordinates picker.

 .Angle - Normalized picker angle, CCW

 .Distance - Normalized distance from center

 .BG ARGB Inner, Outer - standard 32 bits hex strings to specify the ARGB values for the
  background radial gradient. Simply set both to zero to have a 100% transparent background

 .BG Shrink, BG X and Y offsets - shrinks the circular background by a selectable amount of pixels
  (in both directions) and also allows to specify a background offset. Useful to align the circular
  background with a knob image having a shadow (as in case of the default image used) or otherwise
  not perfectly centered within its native frame


