User:Xuwei/DevLog2019

Coummunity Bonding Period

• Set up the Development log
• Set up the development environment such as OS.
• Start to look at the different potential libraries code base.
• Discuss with mentors which external library to choose.

May 16th

• Start to check the checklist.
  • Agreement sent.
  • Dev log created.
  • My Profile created.

May 17th

• Had four of my wisdom teeth extracted. The progress for the following week may be slow due to teeth extraction.

May 19th

• Looking at Coin3D/Dime code base, a possible library for DXF import/export.
  • It has no external dependency.
  • It supports all past and should support the future version of DXF format.
  • It compiles on Windows, Linux, MacOS, etc.
  • But it only loads DXF files into Dime object hierarchies and saves Dime object hierarchies as files conforming to DXF format.
  • Seems only support 3D.

May 20th

• Looking at BRL-CAD DXF import/export code. Trying to understand how it works and see if it is suitable for OpenSCAD.
  • It converts DXF format to .g and .g to DXF which is a BRL-CAD format.
  • It seems that BRL-CAD does not support the entire format, only the part that is relative to solid-model.

May 21st

• Looking at dxflib which is used by QCAD and works fine, but it only supports 2D which is not ideal since OpenSCAD is already supporting 2D.
  • Maybe we can add the 3D part. But not sure how hard it is to add that.

May 22nd

• Searching for a library that supports both 3D and 2D DXF import/export.
  • Libraries above are for either 2D or 3D.
  • Found some libraries support both but they are written in python instead of C++.

May 23rd

• Continue on searching for the potential library.

May 24th

• Looking at and Compile libdxfrw code base which is used by LibreCAD.
• Will be out of town for the next two days.

Coding Period

May

May 27th

• Looking at both libdxfrw(libdxfrw.h, dxfreader.cpp) and OpenSCAD(dxfdata.cc, dxfdim.cc, import.cc) relative code.
  • Comparing the differences between these two on how they handle DXF data.
  • Trying to form a connection between these two.
  • dxfdata.cc seems a bit complicated. Need some time to digest.
  • The way that libdxfrw reads DXF file is kind of mixing with DRW code.
  • libdxfrw encounters problems when dealing with elevated arcs(no response yet).[1]
• Looking at dxflib code base as well.
  • dxflib does not store any entities, only pass supported entities.
  • A useful link for understanding dxflib data structure.[2]

May 28th

• Move on to reading dxflib code for now
  • Continue reading the link about the data structure of dxflib above.
  • Trying to understand form the connection between dxflib and OpenSCAD code base.
• Continue reading dxfdata.cc

May 29th

• Found another one existing integration with dxflib that I can use it as reference.CAMotics
• Continue on reading dxflib and import.cc, dxfdata.cc.
  • Keep trying to write some code that may help understanding how to integrate the library.
• Fill out the comparison wiki page

May 30th

• Had to go the dentist this morning, will catch up the afternoon and at night.
• Keep browsing for more information for those four libraries.
• Reading DXF standard to learn how DXF format works

May 31th

• Searching more information for potential libraries.
  • Add more information that found to the comparison page.
• Learning how to integrate the library from the instruction written by QCAD.

June

June 3rd

• We stick with using BRL-CAD's code for now.
• Try to implement the circle entity.
  • Add a callback function on dxf-g.c to pass the data back to openSCAD.
  • Add processentitiyecircle() to dxfdata.cc and some other changes to enable that function.
  • Having some issue with ADDLINE. Will dig into that later.

June 4th

• Push few commits on import_dxf branch.
  • Basically create a new import_dxf() function that replace the old dxfdata.cc
  • Implement a simple geometry to test out the function

June 5th

• Modify the code committed yesterday to output a simple circle.
• Trying to understand layer, block.

June 6th

• Created a new branch prototype on brlcadDXF repo.
  • Trying to clean up the code so that it could compile independently.

June 7th

• Switch some functions and datatype and continue on cleaning up the code.
• Spend most of my day studying the exam tonight. Will make up the time tomorrow.

June 8th

• Walked through the whole file line by line and cleaned up as much as I can so far. There are still many details that I need to learn to clean up the rest.

June 10th

• Made changes to dxf-g.c according to the answer from brlcad.

June 11th

• fix bu_list with std::list and related functions, etc.

June 12th

• Add functions for circle eclipse from vmath.h, color.h.

June 13th

• Added more functions from dependencies.
• uploaded a file that records to-do list, question, notes, etc.

June 14th

• few fixes on dxf-g.cc.
• Study for the midterm tonight for the most of the day will make up the hours tomorrow.

June 15th

• Finished converting all bu_list data structure to std::list except in one function drawmtext().
  • drawmtext() may be removed later.

June 17th

• Finished fixing all bu_vert_tree structure.
• Started on fixing vls a bit.

June 18th

• Finished fixing all vls except those in the main().

June 19th

• Finished most of the parts of dxf-g.c.
  • Create a new branch test for testing and commented out some less necessary functions to test.
  • Upload test files from openSCAD testdata/dxf
  • Need to fix the segmentation fault.

June 20th

• Fixed numbers of segmentation faults mainly caused by malloc.

June 21st

• Fix strncmp function error
• Tested with circle, ellipse, failed at block section.
• Tried to reconstruct block_list, block_head data structure.

June 24th

• Fix block_list data structure
• Now dxf-g.cc can go through the whole dxf file and spit out data to file output
• Done basic testing with circle, ellipse, polygons, lwpolyline. files from openscad testdata/dxf.
  • Found the correct geometry.
  • coordinates of the vertices are correct.

June 25th

• Randomly picking files from openscad/testdata/dxf to check geometry and coordinates.
• Trying to figure out if the data structure is actually storing the correct data.

June 26th

• Trying to extract data from the data structure to test if it's reading correct data.
  • For circle, extract cirlce_pts.
  • For line, extract line_pts.
  • For lwpolyline, extract polyline_vertice.
  • For elllipse, center and majorAxis
  • For point, pt.

June 27th

• More data extracting continue from yesterday.
• Try to start integrating openscad and dxf-g.cc just for circle entities.

June 28th

• Run openscad together with dxf-g.cc.
• Implemented circle entities using dxf-g.cc called a openscad function.
  • Later the day discussion concluded that this is not the preferred way. deprecated.

July

July 1st

• Added structs for each geometry for storing the data.
• Some minor fixes for original data type point_t.