0336-Tetris-随机生成新方块

环境

• Time 2023-08-22
• Zig 0.11.0
• WSL-Ubuntu 22.04.3 LTS

前言

说明

参考资料：

1. https://www.youtube.com/watch?v=nF_crEtmpBo
2. https://github.com/howprice/sdl2-tetris

目标

使用随机函数，从已有的几种方块中选择一个，生成新的方块，同时增加 app 模块。

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);
    }
};

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);
    }
}

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;
        }

        screen.update();
        game.drawCurrent(&screen);
        screen.present();
    }
}

效果

总结

随机生成一个新的方块，将画当前方块的函数移动到了 app 模块中。

附录