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W5(初次嘗試gd繪圖，以三角函數波型圖為例)

三角函數波型圖程式
// 包含標準輸出入程式庫的標頭文件
// https://blog.csdn.net/weixin_38468077/article/details/101069365
// http://www.gnuplot.info/demo/
// https://github.com/sysprog21/rv32emu
// https://github.com/sysprog21/semu 
// https://docs.google.com/presentation/d/14N0cWG2SnBSqhc2cLF0_2VerB9FF8JN3
// https://cs61c.org/fa23/
// https://greenteapress.com/wp/think-python-2e/
// https://github.com/ecalvadi/c99-examples
// https://github.com/gouravthakur39/beginners-C-program-examples
// https://github.com/ergenekonyigit/Numerical-Analysis-Examples
// https://www.che.ncku.edu.tw/facultyweb/changct/html/teaching/CPPandMATLAB/Past/pdf%20Files/Chap02-Ling.pdf
// https://gteceducation.com.sg/Brochures/PROGRAMMING/C%20PROGRAMMING%20FULL.pdf
// https://jsommers.github.io/cbook/cbook.pdf
// https://jsommers.github.io/cbook/index.html
// http://student.itee.uq.edu.au/courses/csse2310/CProgrammingNotes.pdf
// http://cslibrary.stanford.edu/101/EssentialC.pdf
// https://publications.gbdirect.co.uk/c_book/
// https://www.fossil-scm.org/fossil-book/doc/2ndEdition/fossilbook.pdf
// ***** execute on replit 
// cd downloads
// cc gnuplot_ex1.c -o gnuplot_ex1
// ./gnuplot_ex1
#include <stdio.h>

// 主函式
int main() {
    // Start a Gnuplot process using popen
    FILE *gnuplotPipe = popen("gnuplot -persistent", "w");
    if (!gnuplotPipe) {
        fprintf(stderr, "Failed to start Gnuplot.\n");
        return 1;
    }

    // Use Gnuplot plotting commands, specify font and output as PNG
    fprintf(gnuplotPipe, "set terminal png font 'default,10' size 800,400\n");
    fprintf(gnuplotPipe, "set output './../images/gnuplot_ex1.png'\n");
    fprintf(gnuplotPipe, "plot sin(x)");
    // Close popen
    pclose(gnuplotPipe);

    return 0;
}

從資料庫抓取之程式:{ pkgs }: {
    deps = [
      pkgs.libev
      pkgs.gnuplot
      pkgs.ncurses.dev
      pkgs.gd
    ];
  env = {
    PYTHON_LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [
      pkgs.libev
    ];
  };
}

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