Check Circle Data

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local xc, yc, rad
get_circle_data iref, ics, rad, xc, yc
if (xc - rad) < xmin then xmin = (xc - rad)
if (yc - rad) < ymin then ymin = (yc - rad)
if (xc + rad) > xmax then xmax = (xc + rad)
if (yc + rad) > ymax then ymax = (yc + rad)