C++/Linux - Drawing to a Window -

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i"m taking object oriented programming class, , did project had implement conway's game of life. project specification output lines of text terminal, shows evolution of cells, it's not pretty. thought fun modify program so, instead of sending lines of text terminal, drawing window updated current state of our cells. i'm not looking delve graphics...i'm fine using textual representation of cells original project specified. title of question implies, program written in c++ , made work on linux boxes. what's easiest way me make happen.

edit: okay, think i'm pretty close. problem line breaks aren't appearing. in life "tostring" operator i've tried endl , \n, neither seems work. here code...

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <x11/xlib.h> #include <sstream>  #include "cell.h" #include "life.h"  int main (int argc, char *argv[]) {     display                 *display;     visual                  *visual;     int                     depth;     int                     text_x;     int                     text_y;     xsetwindowattributes    frame_attributes;     window                  frame_window;     xfontstruct             *fontinfo;     xgcvalues               gr_values;     gc                      graphical_context;     xevent                  event;     char                    hello_string[] = "hello world";     int                     hello_string_length = strlen(hello_string);      display = xopendisplay(null);     visual = defaultvisual(display, 0);     depth  = defaultdepth(display, 0);      frame_attributes.background_pixel = xwhitepixel(display, 0);     /* create application window */     frame_window = xcreatewindow(display, xrootwindow(display, 0),                                  0, 0, 400, 400, 5, depth,                                  inputoutput, visual, cwbackpixel,                                  &frame_attributes);     xstorename(display, frame_window, "the game of life");     xselectinput(display, frame_window, exposuremask | structurenotifymask);      fontinfo = xloadqueryfont(display, "10x20");     gr_values.font = fontinfo->fid;     gr_values.foreground = xblackpixel(display, 0);     graphical_context = xcreategc(display, frame_window,                                    gcfont+gcforeground, &gr_values);     xmapwindow(display, frame_window);      life <conwaycell> alife (21, 21);      alife.animate (10, 5, '*');     alife.animate (10, 6, '*');     alife.animate (10, 7, '*');     alife.animate (10, 8, '*');     alife.animate (10, 9, '*');     alife.animate (10, 10, '*');     alife.animate (10, 11, '*');     alife.animate (10, 12, '*');     alife.animate (10, 13, '*');     alife.animate (10, 14, '*');      std::ostringstream outstream;     outstream << alife;     string astring = outstream.str ();     const char* achar = astring.c_str ();     int len = outstream.str ().size ();      while ( 1 ) {         xnextevent(display, (xevent *)&event);         switch ( event.type ) {             case expose:             {                 xwindowattributes window_attributes;                 int font_direction, font_ascent, font_descent;                 xcharstruct text_structure;                 xtextextents(fontinfo, achar, len,                               &font_direction, &font_ascent, &font_descent,                               &text_structure);                 xgetwindowattributes(display, frame_window, &window_attributes);                 text_x = (window_attributes.width - text_structure.width)/2;                 text_y = (window_attributes.height -                            (text_structure.ascent+text_structure.descent))/2;                  outstream << alife;                  xdrawstring(display, frame_window, graphical_context,                             text_x, text_y, achar, len);                 break;             }             default:                 break;         }     }     return(0); }

i give sfml shot. if not suit needs, see this link more suggestions.


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