koolplot
The original koolplot source code is from: Simplest Graph Plotting for C or C++.
Later, someone modified the code, see here: How to build a koolplot library using VC++ 2010. In this repo, the source code is mainly modified from the zip file I downloaded from koolplot-heha.zip, this file contains several sub-folders for Visual Studio C++ 6.0, 2008 and 2017. I have modified the code from the the projects for msvc6, and the Code::Blocks project file(cbp) is supplied.