矢量数学，找到角度 [英] Vector math, finding the angle

问题描述

我正在尝试通过编写一个小型 2D 游戏来学习 XNA，这是一个自上而下的视角，我尝试进行双重运动，使用左右键和上下键沿轴移动，以及向右看鼠标光标，以便玩家可以同时奔跑和瞄准.

我有一个用于玩家位置的向量 (m_PlayerPos) 和一个用于鼠标位置的向量 (m_MousePos)，我正在尝试获得指向鼠标位置的正确角度.

我用的是公式法:

<前>公共静态浮点角(Vector2 from, Vector2 to){return (float)Math.Atan2(from.X - to.X, from.Y - to.Y);}

这有效，但由于某种原因，该方法只能沿 x 轴进行一半.当鼠标位于玩家的右侧时，玩家会看向鼠标.

但是如果我移动到播放器的顶部，它会向下看，如果鼠标在播放器下方，则播放器会向上看.所以我需要反转 Y 轴，但我不确定如何.

提前感谢您的任何反馈.

解决方案

使用 to.Y - from.Y.

I am trying to learn XNA by writing a small 2D game, it's a Top-Down perspective and Im trying to have double movement, moving along the axis using Left-Right and Up-Down keys, as well as looking right at the mouse cursor, so that the player can run and aim at the same time.

I have one vector for the player position (m_PlayerPos), and one vector for the mouse position (m_MousePos), and im trying to get the correct angle towards the mouse position.

Im using the formula method:

public static float Angle(Vector2 from, Vector2 to)
{
    return (float)Math.Atan2(from.X - to.X, from.Y - to.Y);
}

This works, but for some reason the method only works half-way, along the x-axis. When the mouse is to the exact left of right of the player, the player looks right at the mouse.

But if I move to the top of the player, it looks down, and if the mouse is below the player, the player looks up. So I need to inverse the Y axis, but Im not sure how.

Thanks in advance for any feedback.

解决方案

Use to.Y - from.Y.

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