This is a simple X11 template code-snippet for visualising grids (e.g. for spatial simulations, simple games), easy to adapt to any C/C++ code. If you want a fast and responsive display, use this one. I’ve tried a lot of different programming languages, but it’s never anywhere near as fast as this.

X11_With_GridDownload

README:

/*************************************************/
/*	Author: Bram van Dijk (November 2016)    */
/*************************************************/
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//         Displaying a grid in C or C++         //
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//              Compiling C / CPP                //
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gcc -o XGrid Grid.c -lX11 -ljpeg
	or
g++ -o XGrid Grid.c -lX11 -ljpeg

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//      Getting it to work in your program       //
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// See Grid.c for a minimal example
In the sourcefile containing the main function:

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//                 More options                  //
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// I added some keyboard responses too. (see CatchEvents)
Press 's' to save a JPG of your display
Press 't' to show text (maybe a timestamp?)
Press 'q' to close the program.

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 NOTE FOR C++ OOP PROGRAMS: 
 If you want to use it in an object oriented C++ program
 it is best if you split X11_With_Color.c into a header
 file (declarations) and a source file (definitions).
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!