环境
- Time 2023-08-22
- Zig 0.12.0-dev.161+6a5463951
- 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 SDL2 自带的定时器来实现方块的自动下落。
main.zig
const c = @import("c.zig");
const std = @import("std");
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();_ = c.SDL_AddTimer(500, tick, null);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,}
}fn tick(interval: u32, _: ?*anyopaque) callconv(.C) u32 {var event: c.SDL_Event = std.mem.zeroes(c.SDL_Event);event.type = c.SDL_KEYDOWN;event.key.keysym.sym = c.SDLK_DOWN;_ = c.SDL_PushEvent(&event);return interval;
}
只需要修改 main.zig 文件，增加一个 tick 方法，并将其加入到定时器中。
效果
总结
通过定时器来实现方块的自动下落。