import os import gg import gx // import sokol.sapp import time import rand // constants const ( top_height = 100 canvas_size = 700 game_size = 17 tile_size = canvas_size / game_size tick_rate_ms = 100 ) const high_score_file_path = os.join_path(os.cache_dir(), 'v', 'examples', 'snek') // types struct Pos { x int y int } fn (a Pos) + (b Pos) Pos { return Pos{a.x + b.x, a.y + b.y} } fn (a Pos) - (b Pos) Pos { return Pos{a.x - b.x, a.y - b.y} } enum Direction { up down left right } type HighScore = int fn (mut h HighScore) save() { os.mkdir_all(os.dir(high_score_file_path)) or { return } os.write_file(high_score_file_path, (*h).str()) or { return } } fn (mut h HighScore) load() { h = (os.read_file(high_score_file_path) or { '' }).int() } struct App { mut: gg &gg.Context = unsafe { nil } score int best HighScore snake []Pos dir Direction last_dir Direction food Pos start_time i64 last_tick i64 } // utility fn (mut app App) reset_game() { app.score = 0 app.snake = [ Pos{3, 8}, Pos{2, 8}, Pos{1, 8}, Pos{0, 8}, ] app.dir = .right app.last_dir = app.dir app.food = Pos{10, 8} app.start_time = time.ticks() app.last_tick = time.ticks() } fn (mut app App) move_food() { for { x := rand.intn(game_size) or { 0 } y := rand.intn(game_size) or { 0 } app.food = Pos{x, y} if app.food !in app.snake { return } } } // events fn on_keydown(key gg.KeyCode, mod gg.Modifier, mut app App) { match key { .w, .up { if app.last_dir != .down { app.dir = .up } } .s, .down { if app.last_dir != .up { app.dir = .down } } .a, .left { if app.last_dir != .right { app.dir = .left } } .d, .right { if app.last_dir != .left { app.dir = .right } } else {} } } fn on_frame(mut app App) { app.gg.begin() now := time.ticks() if now - app.last_tick >= tick_rate_ms { app.last_tick = now // finding delta direction delta_dir := match app.dir { .up { Pos{0, -1} } .down { Pos{0, 1} } .left { Pos{-1, 0} } .right { Pos{1, 0} } } // "snaking" along mut prev := app.snake[0] app.snake[0] = app.snake[0] + delta_dir for i in 1 .. app.snake.len { tmp := app.snake[i] app.snake[i] = prev prev = tmp } // adding last segment if app.snake[0] == app.food { app.move_food() app.score++ if app.score > app.best { app.best = app.score app.best.save() } app.snake << app.snake.last() + app.snake.last() - app.snake[app.snake.len - 2] } app.last_dir = app.dir } // drawing snake for pos in app.snake { app.gg.draw_rect_filled(tile_size * pos.x, tile_size * pos.y + top_height, tile_size, tile_size, gx.blue) } // drawing food app.gg.draw_rect_filled(tile_size * app.food.x, tile_size * app.food.y + top_height, tile_size, tile_size, gx.red) // drawing top app.gg.draw_rect_filled(0, 0, canvas_size, top_height, gx.black) app.gg.draw_text(150, top_height / 2, 'Score: $app.score', gx.TextCfg{ color: gx.white align: .center vertical_align: .middle size: 65 }) app.gg.draw_text(canvas_size - 150, top_height / 2, 'Best: $app.best', gx.TextCfg{ color: gx.white align: .center vertical_align: .middle size: 65 }) // checking if snake bit itself if app.snake[0] in app.snake[1..] { app.reset_game() } // checking if snake hit a wall if app.snake[0].x < 0 || app.snake[0].x >= game_size || app.snake[0].y < 0 || app.snake[0].y >= game_size { app.reset_game() } app.gg.end() } const font = $embed_file('../assets/fonts/RobotoMono-Regular.ttf') // setup fn main() { mut app := App{ gg: 0 } app.reset_game() app.best.load() mut font_copy := font font_bytes := unsafe { font_copy.data().vbytes(font_copy.len) } app.gg = gg.new_context( bg_color: gx.white frame_fn: on_frame keydown_fn: on_keydown user_data: &app width: canvas_size height: top_height + canvas_size create_window: true resizable: false window_title: 'snek' font_bytes_normal: font_bytes ) app.gg.run() }