v2.0.0

sectionproperties v2 incorporates significant changes to the pre-processor, which now uses the Shapely package to power advanced geometry creation and manipulation, and vastly improves the performance and robustness of the plastic section property algorithm. v2.x.x introduces many breaking changes from v1.x.x when creating and manipulating Geometry, refer to the documentation for more information.

Pre-Processor:

A special mention to @connorferster for a majority of these fantastic additions!

• sections.py renamed to geometry.py
• All Geometry objects are defined by a shapely Polygon
• Addition of new geometry manipulation methods and geometry set operators
• Added .dxf import, thanks to @aegis1980
• Added .3dm import, thanks to @normanrichardson
• Introduction of a CompoundGeometry class for geometries with multiple regions
• Geometry objects are assigned a Material property object, CompoundGeometry objects can contain multiple Geometry objects (each with their own Material object) enabling composite analysis
• Geometry and CompoundGeometry objects contain mesh information and meshing must be performed before initialising a Section object
• Improved .offset_perimeter() logic
• Meshing is now performed by triangle, meshpy is no longer a dependency
• Material class now requires a .density parameter
• The section library (sectionproperties.pre.library) now contains the built-in sectionproperties geometries
• Added triangular_section() and triangular_radius_section() to the primitive_sections library
• Added concrete_sections library - contains concrete_rectangular_section(), concrete_tee_section() and concrete_circular_section()
• Added bridge_section library, thanks to @ccaprani - contains super_t_girder_section() and i_girder_section()

Analysis:

• cross_section.py renamed to section.py
• CrossSection object renamed to Section and is now initialised with only a Geometry or CompoundGeometry object
• Added calculation of cross-section mass
• Added calculation of weighted material properties - E_eff, G_eff, nu_eff
• The plastic algorithm is now performed by shapely, improving performance and robustness
• Added calculation of principal stresses, thanks to @ccaprani
• Shape factors are no longer calculated for composite sections (irrelevant property)

Post-Processor:

• Added the plotting_context() manager, allowing easily saving files, passing kwargs to pyplot.subplots() and much more! Many thanks to @Spectre5
• Improved contour plotting behaviour
• Added plotting of Mohr's circle of stresses for any given point, thanks to @ccaprani
• .display_results() now reports E.J and E.Iw instead of G.J and G.Iw
• .display_results() now reports modulus weighted shear areas for composite sections

Misc.:

• Many spelling and code style fixes, thanks to @Spectre5
• Updated documentation to include theoretical background
• Updated examples to be performed by sphinx-gallery, thanks to @normanrichardson and @Spectre5