simple_spectrum: added more documentation comments

Author: Llammissar

examples/simple_spectrum.d

@@ -1,44 +1,57 @@
+//simple_spectrum: Sample of 256-colour ncurses output in D.
 //Modified by: Wyatt
 
 import std.stdio: writeln;
 import std.conv;
 import deimos.ncurses.ncurses;
 
+//Extended colour support was added in ncurses 5.5 for the wncurses
+//library.  wncurses has generally been shipped by default in Linux
+//distros for roughly the last decade as of this writing (often as the
+//only version installed); if this doesn't work, check that your TERM
+//is compatible with 256-colour modes, that your terminal emulator
+//supports it, and that your copy of ncurses is built with
+//--enable-ext-colors.  If the latter is false, you may wish to file a
+//bug with your distro.
+
 int main()
 {
-    initscr();                              //Start curses mode
+    initscr();
     if(has_colors() == false)
     {
         endwin();
         writeln("Your terminal does not support color...");
         return 1;                           //ends the program
     }
-    start_color();                          // Start color
+    start_color();
     foreach(ushort i; 0 .. 256){ // Define all the colours with the default palette
 	init_pair(i, 0, i);      // We're only setting the background here;
     }                            // The space is rendered as nothing.
+
     auto w = COLS/9; // Let's just fill all the horizontal space
+    
+    // Basic colours
     foreach(ushort i; 0 .. 16){
 	attron(COLOR_PAIR(i));
 	mvwhline(stdscr, cast(int)(i%8),w*(i/8),to!size_t(' '),w);//chtype is a size_t by spec.
 	attroff(COLOR_PAIR(i));
     }
-    //foreach(ushort i; 8 .. 16){
-	//attron(COLOR_PAIR(i));
-	//mvwhline(stdscr, cast(int)(i-8),5,to!size_t(' '),5);
-	//attroff(COLOR_PAIR(i));
-    //}
+    
+    // 6x6x6 cubemap
     foreach(ushort i; 16 .. 232){
 	attron(COLOR_PAIR(i));
 	mvwhline(stdscr, cast(int)((i-16)%36),(2*w+w*((i-16)/36)),to!size_t(' '),w);
 	attroff(COLOR_PAIR(i));
     }
+    
+    // Greyscale
     foreach(ushort i; 232 .. 256){
 	attron(COLOR_PAIR(i));
 	mvwhline(stdscr, cast(int)(i-232),(8*w),to!size_t(' '),w);
 	attroff(COLOR_PAIR(i));
     }
-    wmove(stdscr, LINES-1, COLS-1);
+    
+    wmove(stdscr, LINES-1, COLS-1);//Moving this out of the way
     getch();
     endwin();