from java.awt import Color
from jhplot import *

c1 = HPlot3D('Canvas',600,600)
c1.setNameX('X')
c1.setNameY('Y')
c1.visible()
f1=F2D('x^2+y^2', -2.0, 2.0, -2.0, 2.0)
f2=F2D('4*x*y', -2.0, 2.0, -2.0, 2.0)
c1.draw(f1,f2)