如何将这个匹配语句转换为 HashMap？

发布于 2025-01-16 05:35:15 字数 367 浏览 2 评论 0原文

如何将这个 match 块转换为 HashMap？理想情况下，我想从清单文件创建 HashMap：

match layers[1][p] {
    ',' => tile = grass,
    '*' => tile = sand,

    // And so on....
}

我之前尝试这样做，但 Macroquad 的 Texture2D 与 HashMap 不兼容。（我认为编译器说“不能将选项用作Texture2D”。）

我想做这样的事情：

let tile = hashmap.get(layers[p]);
blit(tile);

原文

How could I convert this match block into a HashMap? Ideally I would like to create a HashMap from a manifest file:

match layers[1][p] {
    ',' => tile = grass,
    '*' => tile = sand,

    // And so on....
}

I tried doing this earlier, but Macroquad's Texture2D is not compatible with a HashMap. (I think the compiler said 'Cannot use Option as Texture2D'.)

I would like to do something like this:

let tile = hashmap.get(layers[p]);
blit(tile);

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青春有你 2025-01-23 05:35:15

让我们保持简单。我不认为 hashmap 会简化任何东西，但为什么不演示它呢。散列的真正优点是您可以动态加载图块并使它们加载到地图中。不过现在，我们将对一些进行硬编码。


fn main() {
    
    /* snip */
    let mut textures = HashMap::new();
    textures.insert(',', grass);
    textures.insert('*', sand);

    /* snip */
    
    // mind that your program will crash if map does 
    // not contain the texture
    let texture = textures.get(layers[p]).unwrap();
    blit(texture)
}

Let's keep this simple. I don't think hashmap will simplify anything but why not demonstrate it. The true advantage of hash is that you can load tiles dynamically and make them loaded into the map. For now, though, we will hardcode some.


fn main() {
    
    /* snip */
    let mut textures = HashMap::new();
    textures.insert(',', grass);
    textures.insert('*', sand);

    /* snip */
    
    // mind that your program will crash if map does 
    // not contain the texture
    let texture = textures.get(layers[p]).unwrap();
    blit(texture)
}

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