diff options
Diffstat (limited to 'snake.jai')
| -rw-r--r-- | snake.jai | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/snake.jai b/snake.jai new file mode 100644 index 0000000..ea8926f --- /dev/null +++ b/snake.jai @@ -0,0 +1,157 @@ +#import "Basic"; +#import "Random"; +TUI :: #import "TUI"; + +Vec2D :: struct { + x: int; + y: int; +} + +operator == :: (a: Vec2D, b: Vec2D) -> bool { + return a.x == b.x && a.y == b.y; +} + +screen_size_x: int = ---; +screen_size_y: int = ---; +player_name: string = ---; + +main :: () { + + game_loop :: () { + + LOOP_PERIOD_MS :: 30; + + score := 0; + dir := Vec2D.{1, 0}; + food := Vec2D.{5, 5}; + + random_food :: () -> Vec2D { + return Vec2D.{ + cast(int)(random_get_zero_to_one_open() * (screen_size_x-3) + 2), + cast(int)(random_get_zero_to_one_open() * (screen_size_y-3) + 2) + }; + } + + snake_parts: [..] Vec2D; + for 0..13 array_add(*snake_parts, Vec2D.{3, 3}); + snake_parts[0].x += 1; + + TUI.flush_input(); + TUI.set_next_key(TUI.Keys.Resize); + timer := current_time_monotonic(); + while main_loop := true { + + timestamp := current_time_monotonic(); + key := TUI.get_key(LOOP_PERIOD_MS); + + if key == { + case TUI.Keys.Resize; + TUI.clear_terminal(); + screen_size_x, screen_size_y = TUI.get_terminal_size(); + TUI.draw_box(1, 1, screen_size_x, screen_size_y); + TUI.set_cursor_position(3, screen_size_y); + write_strings(" ", player_name, " "); + food = random_food(); + + case #char "q"; #through; + case #char "Q"; #through; + case TUI.Keys.Escape; + break main_loop; + + case TUI.Keys.Up; + if dir != Vec2D.{0, 1} then dir = Vec2D.{0, -1}; + + case TUI.Keys.Down; + if dir != Vec2D.{0, -1} then dir = Vec2D.{0, 1}; + + case TUI.Keys.Left; + if dir != Vec2D.{1, 0} then dir = Vec2D.{-1, 0}; + + case TUI.Keys.Right; + if dir != Vec2D.{-1, 0} then dir = Vec2D.{1, 0}; + } + + last_pos := snake_parts[snake_parts.count-1]; + + // Update position. + for < snake_parts.count-1..1 { + if snake_parts[it] != snake_parts[it-1] { + snake_parts[it] = snake_parts[it-1]; + } + } + snake_parts[0].x += dir.x; + snake_parts[0].y += dir.y; + + // Teleport on borders. + if snake_parts[0].x < 2 then snake_parts[0].x = screen_size_x - 1; + if snake_parts[0].x >= screen_size_x then snake_parts[0].x = 2; + if snake_parts[0].y < 2 then snake_parts[0].y = screen_size_y - 1; + if snake_parts[0].y >= screen_size_y then snake_parts[0].y = 2; + + // Check for game-over. + for 1..snake_parts.count-1 { + if snake_parts[it] == snake_parts[0] { + break main_loop; + } + } + + // Check for food. + if snake_parts[0] == food { + score += 1; + array_add(*snake_parts, snake_parts[snake_parts.count-1]); + food = random_food(); + } + + // Wait to match game loop time. + delta := to_milliseconds(current_time_monotonic() - timestamp); + if delta < LOOP_PERIOD_MS { + sleep_milliseconds(xx (LOOP_PERIOD_MS - delta)); + } + + // Draw snake. + write_string(TUI.Commands.DrawingMode); + TUI.set_cursor_position(last_pos.x, last_pos.y); + write_string(TUI.Drawings.Blank); + for snake_parts { + TUI.set_cursor_position(it.x, it.y); + write_string(TUI.Drawings.Checkerboard); + } + // Draw food. + { + TUI.using_style(TUI.Style.{ foreground = TUI.Palette.RED, bold = true, }); + TUI.set_cursor_position(food.x, food.y); + write_string(TUI.Drawings.Diamond); + } + write_string(TUI.Commands.TextMode); + + // Set score + TUI.set_cursor_position(3, 1); + print(" % ", score); + } + } + + GAME_OVER_TEXT :: "~ game over ~"; + INSTRUCTIONS_TEXT :: "(esc to exit)"; + + TUI.start(); + TUI.set_cursor_position(1, 1); + + write_string("Please enter player name: "); + player_name = TUI.read_input_line(64); + + while true { + game_loop(); + + // Game over screen. + TUI.draw_box(screen_size_x/3, screen_size_y/2-1, screen_size_x/3, 4); + TUI.set_cursor_position((screen_size_x-GAME_OVER_TEXT.count)/2, screen_size_y/2); + write_string(GAME_OVER_TEXT); + TUI.set_cursor_position((screen_size_x-GAME_OVER_TEXT.count)/2, screen_size_y/2+1); + write_string(INSTRUCTIONS_TEXT); + sleep_milliseconds(100); + TUI.flush_input(); + if TUI.get_key() == TUI.Keys.Escape then break; + } + + TUI.stop(); +} |