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with Ada.Numerics.Discrete_Random;
package body Game is
procedure Init(game: out T_Game;
width: Positive;
height: Positive) is
begin
game.width := width;
game.height := height;
game.direction := DIRECTION_RIGHT;
Enqueue(game.snake, (2, 2));
Enqueue(game.snake, (2, 3));
game.food := (1, 1);
end Init;
function Next(game: in out T_Game) return Boolean is
new_head: constant T_Position := Next_Head(game);
begin
if not In_Border(game, new_head) then
return false;
end if;
Enqueue(game.snake, new_head);
if new_head /= game.food then
Dequeue(game.snake);
end if;
return true;
end Next;
procedure Spawn_Food(game: in out T_Game) is
subtype T_Width_Random_Range is Positive range 1..game.width;
subtype T_Height_Random_Range is Positive range 1..game.height;
package P_Width_Random is new Ada.Numerics.Discrete_Random(T_Width_Random_Range);
package P_Height_Random is new Ada.Numerics.Discrete_Random(T_Height_Random_Range);
use P_Width_Random;
use P_Height_Random;
width_random_generator: P_Width_Random.Generator;
height_random_generator: P_Height_Random.Generator;
function Valid_Food(game: T_Game; food: T_Position) return Boolean is
cursor: T_List := game.snake.front;
begin
while cursor /= null loop
if food = cursor.data then
return false;
end if;
cursor := cursor.next;
end loop;
return true;
end Valid_Food;
food: T_Position;
begin
-- reset in main
loop
food := (random(height_random_generator), random(width_random_generator));
exit when Valid_Food(game, food);
end loop;
game.food := food;
end Spawn_Food;
function Next_Head(game: T_Game) return T_Position is
head: T_Position := game.snake.back.data;
begin
case game.direction is
when DIRECTION_UP => head.y := head.y - 1;
when DIRECTION_DOWN => head.y := head.y + 1;
when DIRECTION_LEFT => head.x := head.x - 1;
when DIRECTION_RIGHT => head.x := head.x + 1;
end case;
return head;
end Next_Head;
function In_Border(game: T_Game; pos: T_Position) return Boolean is
begin
return pos.y >= 1 and pos.y <= game.height and pos.x >= 1 and pos.x <= game.width;
end In_Border;
end Game;
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