WIDTH =800
HEIGHT=800

WHITE=(255 , 255 , 255)
BLACK=(0   , 0   , 0  )
RED  =(255 , 0   , 0  )
GREEN=(0   , 255 , 0  )
BLUE =(0   , 0   , 255)

NODE_MIN_VEL = 1.0
NODE_MAX_VEL = 2.0

NODE_MIN_RADIUS = 8
NODE_MAX_RADIUS = 30