Ada95/samples/rain.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                       GNAT ncurses Binding Samples                       --
   4 --                                                                          --
   5 --                                   Rain                                   --
   6 --                                                                          --
   7 --                                 B O D Y                                  --
   8 --                                                                          --
   9 ------------------------------------------------------------------------------
  10 -- Copyright (c) 1998 Free Software Foundation, Inc.                        --
  11 --                                                                          --
  12 -- Permission is hereby granted, free of charge, to any person obtaining a  --
  13 -- copy of this software and associated documentation files (the            --
  14 -- "Software"), to deal in the Software without restriction, including      --
  15 -- without limitation the rights to use, copy, modify, merge, publish,      --
  16 -- distribute, distribute with modifications, sublicense, and/or sell       --
  17 -- copies of the Software, and to permit persons to whom the Software is    --
  18 -- furnished to do so, subject to the following conditions:                 --
  19 --                                                                          --
  20 -- The above copyright notice and this permission notice shall be included  --
  21 -- in all copies or substantial portions of the Software.                   --
  22 --                                                                          --
  23 -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  --
  24 -- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               --
  25 -- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   --
  26 -- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   --
  27 -- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    --
  28 -- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    --
  29 -- THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               --
  30 --                                                                          --
  31 -- Except as contained in this notice, the name(s) of the above copyright   --
  32 -- holders shall not be used in advertising or otherwise to promote the     --
  33 -- sale, use or other dealings in this Software without prior written       --
  34 -- authorization.                                                           --
  35 ------------------------------------------------------------------------------
  36 --  Author:  Laurent Pautet <pautet@gnat.com>
  37 --  Modified by:  Juergen Pfeifer, 1997
  38 --  Version Control
  39 --  $Revision: 1.6 $
  40 --  Binding Version 01.00
  41 ------------------------------------------------------------------------------
  42 --                                                                          --
  43 with Ada.Numerics.Float_Random; use Ada.Numerics.Float_Random;
  44 with Status; use Status;
  45 with Terminal_Interface.Curses; use Terminal_Interface.Curses;
  46
  47 procedure Rain is
  48
  49    Visibility : Cursor_Visibility;
  50
  51    subtype X_Position is Line_Position;
  52    subtype Y_Position is Column_Position;
  53
  54    Xpos    : array (1 .. 5) of X_Position;
  55    Ypos    : array (1 .. 5) of Y_Position;
  56
  57    N : Integer;
  58
  59    G : Generator;
  60
  61    Max_X, X : X_Position;
  62    Max_Y, Y : Y_Position;
  63
  64    procedure Next (J : in out Integer);
  65    procedure Cursor (X : X_Position; Y : Y_Position);
  66
  67    procedure Next (J : in out Integer) is
  68    begin
  69       if J = 5 then
  70          J := 1;
  71       else
  72          J := J + 1;
  73       end if;
  74    end Next;
  75
  76    procedure Cursor (X : X_Position; Y : Y_Position) is
  77    begin
  78       Move_Cursor (Line => X, Column => Y);
  79    end Cursor;
  80    pragma Inline (Cursor);
  81
  82 begin
  83
  84    Init_Screen;
  85    Set_NL_Mode;
  86    Set_Echo_Mode (False);
  87
  88    Visibility := Invisible;
  89    Set_Cursor_Visibility (Visibility);
  90
  91    Max_X := Lines - 5;
  92    Max_Y := Columns - 5;
  93
  94    for I in Xpos'Range loop
  95       Xpos (I) := X_Position (Float (Max_X) * Random (G)) + 2;
  96       Ypos (I) := Y_Position (Float (Max_Y) * Random (G)) + 2;
  97    end loop;
  98
  99    N := 1;
 100    while Process.Continue loop
 101
 102       X := X_Position (Float (Max_X) * Random (G)) + 2;
 103       Y := Y_Position (Float (Max_Y) * Random (G)) + 2;
 104
 105       Cursor (X, Y);
 106       Add (Ch => '.');
 107
 108       Cursor (Xpos (N), Ypos (N));
 109       Add (Ch => 'o');
 110
 111       --
 112       Next (N);
 113       Cursor (Xpos (N), Ypos (N));
 114       Add (Ch => 'O');
 115
 116       --
 117       Next (N);
 118       Cursor (Xpos (N) - 1, Ypos (N));
 119       Add (Ch => '-');
 120       Cursor (Xpos (N), Ypos (N) - 1);
 121       Add (Str => "|.|");
 122       Cursor (Xpos (N) + 1, Ypos (N));
 123       Add (Ch => '-');
 124
 125       --
 126       Next (N);
 127       Cursor (Xpos (N) - 2, Ypos (N));
 128       Add (Ch => '-');
 129       Cursor (Xpos (N) - 1, Ypos (N) - 1);
 130       Add (Str => "/\\");
 131       Cursor (Xpos (N), Ypos (N) - 2);
 132       Add (Str => "| O |");
 133       Cursor (Xpos (N) + 1, Ypos (N) - 1);
 134       Add (Str => "\\/");
 135       Cursor (Xpos (N) + 2, Ypos (N));
 136       Add (Ch => '-');
 137
 138       --
 139       Next (N);
 140       Cursor (Xpos (N) - 2, Ypos (N));
 141       Add (Ch => ' ');
 142       Cursor (Xpos (N) - 1, Ypos (N) - 1);
 143       Add (Str => "   ");
 144       Cursor (Xpos (N), Ypos (N) - 2);
 145       Add (Str => "     ");
 146       Cursor (Xpos (N) + 1, Ypos (N) - 1);
 147       Add (Str => "   ");
 148       Cursor (Xpos (N) + 2, Ypos (N));
 149       Add (Ch => ' ');
 150
 151       Xpos (N) := X;
 152       Ypos (N) := Y;
 153
 154       Refresh;
 155       Nap_Milli_Seconds (50);
 156    end loop;
 157
 158    Visibility := Normal;
 159    Set_Cursor_Visibility (Visibility);
 160    End_Windows;
 161
 162 end Rain;