Draws a circle in the current figure.
Parameters : | radius : float
loc : tuple of floats
color : pyx.color.*.*
linewidth : pyx.style.linewidth.*
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Examples
>>> d = DualEPS()
>>> d.axis_box(xrange=(0,100), yrange=(1e-3,1), ylog=True)
>>> d.insert_image("image.jpg")
>>> d.circle(radius=0.1, color=pyx.color.cmyk.Red)
>>> d.save_fig()