import gmsh
import sys

gmsh.initialize(sys.argv)

# creates the FLTK user interface; this could also be called after the geometry
# is created (or not at all - fltk.run() will do it automatically)
if '-nopopup' not in sys.argv:
    gmsh.fltk.initialize()

# Copied from boolean.py...
gmsh.model.add("boolean")
gmsh.option.setNumber("Mesh.Algorithm", 6)
gmsh.option.setNumber("Mesh.MeshSizeMin", 0.4)
gmsh.option.setNumber("Mesh.MeshSizeMax", 0.4)
R = 1.4
Rs = R * .7
Rt = R * 1.25
gmsh.model.occ.addBox(-R, -R, -R, 2 * R, 2 * R, 2 * R, 1)
gmsh.model.occ.addSphere(0, 0, 0, Rt, 2)
gmsh.model.occ.intersect([(3, 1)], [(3, 2)], 3)
gmsh.model.occ.addCylinder(-2 * R, 0, 0, 4 * R, 0, 0, Rs, 4)
gmsh.model.occ.addCylinder(0, -2 * R, 0, 0, 4 * R, 0, Rs, 5)
gmsh.model.occ.addCylinder(0, 0, -2 * R, 0, 0, 4 * R, Rs, 6)
gmsh.model.occ.fuse([(3, 4), (3, 5)], [(3, 6)], 7)
gmsh.model.occ.cut([(3, 3)], [(3, 7)], 8)
gmsh.model.occ.synchronize()
# ...end of copy

# hide volume
gmsh.model.setVisibility(gmsh.model.getEntities(3), 0)
# color all surfaces gold
gmsh.model.setColor(gmsh.model.getEntities(2), 249, 166, 2)

# this would be equivalent to gmsh.fltk.run():
#
# gmsh.graphics.draw()
# while True:
#     gmsh.fltk.wait()
#     print("just treated an event in the interface")

if '-nopopup' not in sys.argv:
    gmsh.fltk.run()

gmsh.finalize()
