方向 += (float)GD.RandRange(-Mathf.Pi / 4, Mathf.Pi / 4); c# 这里的 (float) 是什么意思？

发布于 2025-01-16 05:32:25 字数 1709 浏览 1 评论 0原文

我正在阅读 Godot 引擎文档，发现一些对我来说毫无意义的内容。

有人可以解释一下弯括号中的(float)或(Type)在类之前意味着什么吗？

direction += (float)GD.RandRange(-Mathf.Pi / 4, Mathf.Pi / 4);
mob.Rotation = direction;

或者

var mob = (Mob)MobScene.Instance();

这是代码片段：

public void OnMobTimerTimeout()
{
    // Note: Normally it is best to use explicit types rather than the `var`
    // keyword. However, var is acceptable to use here because the types are
    // obviously Mob and PathFollow2D, since they appear later on the line.

    // Create a new instance of the Mob scene.
    var mob = (Mob)MobScene.Instance();

    // Choose a random location on Path2D.
    var mobSpawnLocation = GetNode<PathFollow2D>("MobPath/MobSpawnLocation");
    mobSpawnLocation.Offset = GD.Randi();

    // Set the mob's direction perpendicular to the path direction.
    float direction = mobSpawnLocation.Rotation + Mathf.Pi / 2;

    // Set the mob's position to a random location.
    mob.Position = mobSpawnLocation.Position;

    // Add some randomness to the direction.
    direction += (float)GD.RandRange(-Mathf.Pi / 4, Mathf.Pi / 4);
    mob.Rotation = direction;

    // Choose the velocity.
    var velocity = new Vector2((float)GD.RandRange(150.0, 250.0), 0);
    mob.LinearVelocity = velocity.Rotated(direction);

    // Spawn the mob by adding it to the Main scene.
    AddChild(mob);
}

它来自文章主要游戏场景是Godot官方文档的一部分。

我找不到有关它的一些信息。

一些解释这一点的来源或示例会很棒，提前致谢。

原文

I am reading the Godot Engine documentation and saw something that makes no sense to me.

Can somebody explain what a (float) or (Type) in curved brackets means before a class?

direction += (float)GD.RandRange(-Mathf.Pi / 4, Mathf.Pi / 4);
mob.Rotation = direction;

var mob = (Mob)MobScene.Instance();

This is the code snippet:

public void OnMobTimerTimeout()
{
    // Note: Normally it is best to use explicit types rather than the `var`
    // keyword. However, var is acceptable to use here because the types are
    // obviously Mob and PathFollow2D, since they appear later on the line.

    // Create a new instance of the Mob scene.
    var mob = (Mob)MobScene.Instance();

    // Choose a random location on Path2D.
    var mobSpawnLocation = GetNode<PathFollow2D>("MobPath/MobSpawnLocation");
    mobSpawnLocation.Offset = GD.Randi();

    // Set the mob's direction perpendicular to the path direction.
    float direction = mobSpawnLocation.Rotation + Mathf.Pi / 2;

    // Set the mob's position to a random location.
    mob.Position = mobSpawnLocation.Position;

    // Add some randomness to the direction.
    direction += (float)GD.RandRange(-Mathf.Pi / 4, Mathf.Pi / 4);
    mob.Rotation = direction;

    // Choose the velocity.
    var velocity = new Vector2((float)GD.RandRange(150.0, 250.0), 0);
    mob.LinearVelocity = velocity.Rotated(direction);

    // Spawn the mob by adding it to the Main scene.
    AddChild(mob);
}

It is from the article The main game scene which is part of the official documentation of Godot.

I could not find some information about it.

Some Source or examples that explains this would be great, thanks in advance.

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

烟─花易冷 2025-01-23 05:32:25

这是一个类型转换。它与类或其类型无关，而是与函数调用的返回值有关。您没有提供完整的上下文，但我假设调用 GD.RandRange(-Mathf.Pi / 4, Mathf.Pi / 4); 返回一个 double 类型的值 code> 且变量 direction 的类型为 float。由于没有从 double 到 float 的隐式转换，因此需要显式转换。 (float) 正是这样做的：它将 RandRange 方法调用的返回值转换为 float 类型。