File: select_elements.py

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gmsh 4.15.1%2Bds1-2
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import gmsh
import sys

gmsh.initialize()
gmsh.model.occ.addRectangle(0,0,0,1,1)
gmsh.model.occ.synchronize()
gmsh.model.mesh.generate()

if '-nopopup' in sys.argv:
    exit(0)

while 1:
    gmsh.fltk.setStatusMessage("Select an element, or press 'q' to quit", True)
    ret, ele = gmsh.fltk.selectElements()
    if ret == 0: break
    else: print(ele)

gmsh.finalize()