RC Rectangular Section

import numpy as np
from opstool.preprocessing import SecMesh, add_material, add_polygon, add_circle, offset, Rebars

outlines = [[0, 0], [2, 0], [2, 2], [0, 2]]
coverlines = offset(outlines, d=0.05)
cover = add_polygon(outlines, holes=[coverlines])
core = add_polygon(coverlines)
sec = SecMesh()
sec = SecMesh()
sec.assign_group(dict(cover=cover, core=core))
sec.assign_mesh_size(dict(cover=0.02, core=0.05))
sec.assign_group_color(dict(cover="gray", core="green"))
sec.mesh()
sec.get_sec_props(display_results=False, plot_centroids=False)
sec.centring()
# sec.rotate(45)
sec.view(fill=True, engine='plotly', save_html=None, on_notebook=True)

D:\AcademicSoft\Anaconda3\lib\site-packages\sectionproperties\analysis\section.py:198: ShapelyDeprecationWarning: STRtree will be changed in 2.0.0 and will not be compatible with versions < 2.
  self.mesh_search_tree = STRtree(p_mesh)