Implemented Fuselage Profile Type: Rectangle (Issue #909)

[merakulix]

Description

Implementing the rectangle profile type as an element of the CPACS standard profile type covers one part of issue #909 on parametric profile types.
This approach is based on point lists (std::vector<gp_Pnt>) for approximation of curves, since the lofting algorithms don't support rational B-Splines yet.

Changes in tiglcommonfunctions.* :

Added new global functions:
- BuildWireRectangle(... , ): Builds the wire which is needed to build profiles. Uses these newly implemented functions:
- ApproximateArcOfCircleToRationalBSpline(... , ): Approximation to a rational B-Spline via point list was needed, since the lofting algorithm doesn't support rational B-Splines yet
- Linspace(... , ): Useful function when building point lists

Changes in CCPACSFuselageProfile.* :

Added new member function

• BuildWiresRectangle(...,): - uses buildWireRactangle(..,) from tiglcommonfunctions.*

Changed member function:

• BuildWires(...): Added conditional statement to choose right method for building the wire, depending on profile type

How Has This Been Tested?

Added Unit Tests:

• testFuselageStandardProfileRectangle.cpp:
  • added testfiles that define a fuselage with mixed profiles:
    • simpletest_standard_profile_rectangle_circle_guides.cpacs.xml
    • simpletest_standard_profile_rectangle_circle_guides.cpacs.xml

a circle profile with kinks and a rectangle profile with and without corner radius, as shown in the image below

circle profile, rectangle profile with and without corner radius given, and guide curves, as shown in the images below

Checklist:

• [x ] A test for the new functionality was added.
• [x ] All tests run without failure.
• [x ] The new code complies with the TiGL style guide.
• New classes have been added to the Python interface.
• API changes were documented properly in tigl.h.

[merakulix]

I updated the code to generate the profiles using the CFunctionToBSpline function. On my local machine unit-and integration tests ran successful.

[joergbrech]

Thanks @merakulix! This looks really good! Just one minor cosmetic change and this is good to merge