环境
- Time 2023-08-22
- Zig 0.11.0
- WSL-Ubuntu 22.04.3 LTS
前言
说明
参考资料：
- https://www.youtube.com/watch?v=nF_crEtmpBo
- https://github.com/howprice/sdl2-tetris
目标
使用上方向键来控制方块的旋转，旋转的过程中，需要保证不旋转到屏幕外。
app.zig
const std = @import("std");
const Screen = @import("display.zig").Screen;
const Tetrimino = @import("block.zig").Tetrimino;pub const Game = struct {current: Tetrimino,prng: std.rand.DefaultPrng,pub fn new() Game {const seed = @as(u64, @intCast(std.time.timestamp()));var rand = std.rand.DefaultPrng.init(seed);return Game{.current = Tetrimino.random(&rand),.prng = rand,};}pub fn drawCurrent(self: *Game, screen: *Screen) void {draw(&self.current, screen);}pub fn moveLeft(self: *Game, screen: *Screen) void {_ = screen;self.move(-1, 0);}pub fn moveRight(self: *Game, screen: *Screen) void {_ = screen;self.move(1, 0);}pub fn moveDown(self: *Game, screen: *Screen) void {_ = screen;self.move(0, 1);}fn move(self: *Game, x: i8, y: i8) void {self.current.x = self.current.x + x;self.current.y = self.current.y + y;self.current.locateIn();}pub fn rotate(self: *Game, screen: *Screen) void {_ = screen;self.current.rotate();self.current.locateIn();}
};fn draw(block: *const Tetrimino, screen: *Screen) void {const value = block.position();var index: usize = 0;while (index < value.len) : (index += 2) {const row: usize = @intCast(block.x + value[index]);const col: usize = @intCast(block.y + value[index + 1]);screen.draw(row, col, block.color);}
}
增加了旋转 rotate 方法。
main.zig
const c = @import("c.zig");
const display = @import("display.zig");
const app = @import("app.zig");pub fn main() !void {var screen = display.Screen{};screen.init();defer screen.deinit();var game = app.Game.new();mainLoop: while (true) {var event: c.SDL_Event = undefined;while (c.SDL_PollEvent(&event) != 0) {if (event.type == c.SDL_QUIT)break :mainLoop;handleInput(&game, &screen, &event);}screen.update();game.drawCurrent(&screen);screen.present();}
}fn handleInput(game: *app.Game, screen: *display.Screen, event: *c.SDL_Event) void {if (event.type != c.SDL_KEYDOWN) return;const code = event.key.keysym.sym;switch (code) {c.SDLK_LEFT => game.moveLeft(screen),c.SDLK_RIGHT => game.moveRight(screen),c.SDLK_UP => game.rotate(screen),c.SDLK_DOWN => game.moveDown(screen),c.SDLK_SPACE => game.rotate(screen),else => return,}
}
增加了键盘控制，可以使用上和空格来进行旋转。
效果
总结
通过键盘的上键和空格键，来控制方块的旋转。