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You can use any boxtype you like, but the final dial face always
appears to be circular although certain correlation between the
requested boxtype and actual boxtype exists (for example,
FL_FRAME_BOX
is translated into a circular frame box.)
The first color argument (col1
to
fl_set_object_color()
controls the color of the
background of the dial, the second col2
) the color of the knob
or the line or the fill color.