如何使物体沿圆弧路径移动? [英] How to make an object move in the path of an arc?

问题描述

我正在制作一个游戏，其中应该有一个机器人向另一个机器人扔球状物体.

I'm making a game where there should be a robot throwing ball-shaped objects at another robot.

投出的球应呈对称弧形飞行.很确定这个数学词是抛物线.

The balls thrown should fly in the shape of a symmetrical arc. Pretty sure the math-word for this is a parabola.

两个机器人都在 x 轴上.

Both robots are on the x axis.

如何在我的游戏中实现这样的功能?我尝试了不同的方法，都没有奏效.

How can I implement such a thing in my game? I tried different approaches, none worked.

我的游戏中当前移动物体的系统是这样的:每个物体都有 x 和 y 坐标(变量)，以及 dx 和 dy 变量.

The current system of moving things in my game, is like so: Every object has x and y co-ordinates (variables), and dx and dy variables.

每个对象都有一个 move() 方法，该方法在游戏循环的每个循环中都会被调用.它只是将 dx 添加到 x 并将 dy 添加到 y.

Every object has a move() method, that get's called every cycle of the game-loop. It simply adds dx to x and dy to y.

我如何将我描述的内容应用到这个系统中?

How can I implement what I described, into this system?

如果涉及到很多数学，请尽量用简单的方式解释，因为我不太擅长数学.

If there is a lot of math involved, please try to explain in a simply way, because I'm not great with math.

我的情况:

非常感谢

推荐答案

你应该为你的导弹添加速度.

You should add velocity to your missiles.

Velocity 是一个向量，这意味着它表示导弹在 x 轴上移动的速度和在 y 轴上移动的速度.现在，不要使用 Move()，而是使用类似 Update() 的东西.像这样:

Velocity is a vector, which means it says how fast the missile moves in x-axis and how fast in y-axis. Now, instead of using Move() use something like Update(). Something like this:

void Update()
{
    position.X += velocity.X;
    position.Y += velocity.Y;
}

现在让我们想想，导弹一旦被击中会发生什么:

Now let's think, what happens to the missile, once it is shot:

一开始它有一些启动速度.例如，有人在 x 方向以 1 m/s 的速度发射导弹，在 y 方向以 -0.5 m/s 的速度发射导弹.然后当它发射时，导弹将被拉到地面 - 它的 Y 速度将向地面增加.

In the beginning it has some start velocity. For example somebody shot the missile with speed of 1 m/s in x, and -0.5 m/s in y. Then as it files, the missile will be pulled to the ground - it's Y velocity will be growing towards ground.

void Update()
{
    velocity.Y += gravity;

    position.X += velocity.X;
    position.Y += velocity.Y;
}

这将使您的导弹根据物理原理(不包括空气阻力)移动，并生成漂亮的抛物线.

This will make your missile move accordingly to physics (excluding air resistance) and will generate a nice-looking parabola.

您可能会问如何计算初始速度.假设我们有给定的射击角度(在射击线和地面之间)和初始速度(我们可能知道射击后的导弹有多快，只是不知道 X和 Y 值).然后:

You might ask how to calculate the initial velocity. Let's assume we have a given angle of shot (between line of shot and the ground), and the initial speed (we may know how fast the missiles after the shot are, just don't know the X and Y values). Then:

velocity.X = cos(angle) * speed;
velocity.Y = sin(angle) * speed;

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