<s> class Ring ( object ) : <EOL> def start ( self , xpos , ypos ) : <EOL> self . x = xpos <EOL> self . y = ypos <EOL> self . diameter = <NUM_LIT:1> <EOL> self . on = False <EOL> self . on = True <EOL> def grow ( self ) : <EOL> if self . on : <EOL> self . diameter += <NUM_LIT:0.5> <EOL> if self . diameter > width * <NUM_LIT:2> : <EOL> self . diameter = <NUM_LIT:0.0> <EOL> def display ( self ) : <EOL> if self . on : <EOL> noFill ( ) <EOL> strokeWeight ( <NUM_LIT:4> ) <EOL> stroke ( <NUM_LIT> , <NUM_LIT> ) <EOL> ellipse ( self . x , self . y , self . diameter , self . diameter ) </s>
