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 ) // 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 } struct App { mut: gg &gg.Context score int 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(tile_size * pos.x, tile_size * pos.y + top_height, tile_size, tile_size, gx.blue) } // drawing food app.gg.draw_rect(tile_size * app.food.x, tile_size * app.food.y + top_height, tile_size, tile_size, gx.red) // drawing top app.gg.draw_rect(0, 0, canvas_size, top_height, gx.black) app.gg.draw_text(350, top_height / 2, 'Score: $app.score', gx.TextCfg{ color: gx.white align: .center vertical_align: .middle size: 80 }) // 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() } // setup fn main() { mut app := App{ gg: &gg.Context{} } app.reset_game() 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' canvas: 'canvas' ) app.gg.run() }