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You need GTK+,GTK+ stands dor GIMP Tool Kit and it was originally developed for GIMP(GNU Image Manipulation Program.
sudo apt-get install build-essential sudo apt-get install libgtk2.0-doc devhelp sudo apt-get installlibgtk2.0-dev sudo apt-get install build-essential sudo apt-get install libgtk2.0-doc devhelp
[goal] 1.mouse can drag "left click to add arrow to function" 2.when mouse to "square" the function will display his "sketch comment"
[feature] 3.buttom will display his "data structure number"
echo sketch echo arrow echo function echo structure interface
[feature] 1.color choice 2.data structure need [IN] [OUT]
1.data structure 2.how to parse
gcc first.c -o first pkg-config --cflags --libs gtk+-2.0
[GTK+] http://recolog.blogspot.tw/2011/08/gui-programming-with-c-language-on.html
[Coding stytle] http://codex.wiki/post/164420-438 https://www.ptt.cc/bbs/C_and_CPP/M.1320472279.A.C06.html