from jhplot import *
from java.awt import Color
from java.util import Random
c1=HPlotXYZ("test",600,400)
c1.setGTitle("3D function")
c1.visible()
f1=F2D("x*x+y*y",-2,2,-2,2)
c1.setContourMesh3D()
c1.add(f1)
# c1.setLegendBar()
c1.setTickDecimalAll(1)
c1.update()
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