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* Found problem with mesh.
 
* Found problem with mesh.
  
===July 8th===
+
===July 6th===
 
* Trying to fix mesh
 
* Trying to fix mesh
  
===July 9th===
+
===July 7th===
 
* Change the structure of the entire code to use the code of dxfdata to fix the mesh problem
 
* Change the structure of the entire code to use the code of dxfdata to fix the mesh problem
 
* The code still not able to produce the correct polygon yet.
 
* The code still not able to produce the correct polygon yet.
===July 10th===
+
===July 8th===
 
* Fix the mesh problem and now the code can properly import a single dxf file.
 
* Fix the mesh problem and now the code can properly import a single dxf file.
 
** For some reason, the data is store and fill in the next polygon if the second dxf is imported.
 
** For some reason, the data is store and fill in the next polygon if the second dxf is imported.
 
===July 11th===
 
* Fix the data leakage between document.
 
* Now the code is passing all the test file except nothing decimal comma and transform insert.
 
** the reader has an issue with insert entity
 
 
===July 12th===
 
* Trying to figure out how to fix the insert.
 
* Learning the insert spec from dxf manual
 
 
===July 14th===
 
* Fix the block list and curr_block is not storing value properly
 
* There is an infinite loop caused by the file offset in the process_enitites_unknown
 
** It jumps to the previous line but does not jump back
 
* Continue on fixing insert
 
 
===July 15th===
 
* Clean up most of the commented code in dxf.cc and dxf.h
 
* fix the curr_block memory issue by using a global variable indx that indicate the position of the block in block_list
 
* Continue on fixing insert
 
 
===July 16th===
 
* Adding back_file_offset to state_data to have the program jump back
 
** Still getting the wrong result, the geometries are scattered but shapes are the same.
 
* Continue on fixing insert
 
 
===July 17th===
 
* replace all memory allocation function related to insert with new and delete
 
** valgrind now output no error or warning
 
* Continue on fixing insert
 
 
===July 18th===
 
* Download and build brlcad to test out what's the difference and if it can output the correct result
 
** There is no problem with the curr_state->file_offset
 
* Continue on fixing insert
 
 
===July 19th===
 
* Found that the brlcad xform is different than my version.
 
** Can't figure out why it's different
 
* Continue on fixing insert
 
 
===July 20th===
 
* Found the BU_LIST_POP actually assign curr_state to the last element of the list
 
** This fix the infinity loop and remove back_file_offset.
 
* Continue on fixing insert
 
 
===July 21st===
 
*By switching the push_back and new_state = curr_state this fix the xform problem.
 
** Insert is fixed but it looks there is an issue with different compiler
 
 
===July 22nd===
 
*Cleaning up dxf.cc, import-dxf.cc, dxf.h.
 
 
===July 23rd===
 
*Finished cleaning up dxf.cc, import-dxf.cc, dxf.h.
 
* Make [https://github.com/openscad/openscad/pull/3005 #pr3005] to test in various platform.
 
 
===July 24th===
 
*Fix scale, xyorigin, layername problem.
 
*Test result [https://github.com/openscad/openscad/pull/3006]
 
 
===July 25th===
 
* Starting working on spline entity.
 
* Reading spline related code on QCAD.
 
* Learning dxf spline entity spec.
 
 
===July 26th===
 
* QCAD is using an external library opennurbs to deal with the spline.
 
* Reading spline related code on BRL-CAD.
 
** BRL-CAD code can be implemented on openscad.
 
 
===July 29th===
 
* Replicate and integrate brlcad spline code to openscad.
 
 
===July 30th===
 
* Continue integrating blrcad spline code to openscad.
 
 
===July 31st===
 
* Testing brlcad code with openscad, comparing with brlcad and qcad.
 
** Creating test cases using AutoCAD.
 
** Both brlcad and qcad seems to not supporting the spline created by autocad properly due to dxf version problem.
 
** brlcad encounter segmentation fault with one of the spline test cases.
 
 
==August==
 
 
===August 1st===
 
* Switch to reading LibreCAD spline related code.
 
** LibreCAD 2.x version is using their own code.
 
* Also reading openscad bezier curve related code.
 
 
===August 2nd===
 
* LibreCAD can handle the spline created by autocad unlike brlcad and qcad.
 
* OpenSCAD code can handle degree 2, 3 normal spline(Beizer curve) properly.
 
** Starting adding openscad code to import_dxf.
 
 
===August 3rd===
 
* Modified openscad code and integrated it to import_dxf.
 
 
===August 4th===
 
* Testing the spline import of openscad
 
** Able to import 3 control points for degree 2 spline and 4 for degree 3 spline.
 
** Fail to generate continuous bezier curve.
 
 
===August 5th===
 
* Trying to figure an algorithm or a way to generate continuous bezier curve like this [https://www.algosome.com/articles/continuous-bezier-curve-line.html article].
 
 
===August 6th===
 
* OpenSCAD is now able to import degree 1-3 spline with certain numbers of control points.
 
** spline knots, weights, fit points are ignored.
 
 
===August 7th - 14th===
 
* Family trip.
 
* Originally from 7th-12th, due to the riots in Hong Kong airport and the typhoon in Osaka, flight got cancelled and delayed. ** Due to the typhoon, updated flight time is 16th.
 
 
===August 15th===
 
* Starting working on polyline entity.
 
 
===August 16th===
 
* Rearrange code and fix error in storing polyline vertex in the importer.
 
* On the flight home
 
 
===August 17th===
 
* Integrate 2D polyline entity to openscad ignoring 3D polyline features and curve-fit.
 
 
===August 18th===
 
* Improve polyline with the spline-fit flag, can generate by both spline vertex and control points.
 
* Test polyline.
 
* Add test cases to the test suite.
 

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