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Replace your DrawableFillOpacity() statement with
to draw a non-opaque circle.
You can list the font names available with
convert -list type
Im is attempting to fill with the transparent color, however the image you created does not have an alpha channel to handle a transparent color.
As "none" is actually fully-transparent black, the fill color comes out as black.
To fix add a -matte option before your -draw to ensure the image has a transparent channel. Or set the canvas with a color containing transparency
for example: xc:none or xc:#FF000000
I am not sure how you do this in an API.