鼠标移动

Other languages:

鼠标移动表示光标在屏幕上的瞬时位移（以像素为单位）： ( ${\textstyle dx,dy}$ )。

在《我的世界》中，鼠标移动代表视角的即时旋转(以角度表示)： ( ${\textstyle \Delta x,\Delta y}$ )。

灵敏度

灵敏度(s)是一个参数，用于改变视角的旋转速度。

可以在“控制”菜单中更改此设置。

默认灵敏度为"100%" ( ${\textstyle s=0.5}$ )

原版中最低的灵敏度是"0%" ( ${\textstyle s=0.0}$ )
原版中最高的灵敏度是"200%" ( ${\textstyle s=1.0}$ )

在1.8中， ${\textstyle \Delta x}$ 计算如下:

$\Delta x=1.2dx\times (0.6s+0.2)^{3}$

${\textstyle \Delta y}$ 以同样的方式获得，如果打开了“鼠标反转”，则乘以-1。

在默认灵敏度下( ${\textstyle s=0.5}$ )，鼠标移动一个像素转换为0.15°旋转。

这意味着视角以0.15°的增量移动：如果要转45°，则需要移动鼠标300px。

此外，s理论上并不受 [0,1] 的限制，它可以取任何值（甚至是负值）

您可以在 options.txt （ .minecraft 文件夹中）中手动编辑 mouseSensitivity 的值

请注意，服务器上可能允许也可能不允许修改 options.txt 文件。

特殊的值

由于可以将灵敏度设置为我们想要的任何值，因此调整灵敏度以匹配特定的旋转增量可能会很有趣。

为了得到所需增量的灵敏度 ${\textstyle \delta }$ ，我们可以使用逆公式:

$s={\frac {{\sqrt[{3}]{\frac {\delta }{1.2}}}-0.2}{0.6}}$

此表列出了一些特殊的旋转增量，以及 s 的相应值。

${\textstyle \delta }$	s
0°	-0.3333333
0.1°	0.3946504
0.15°	0.5
0.25°	0.6546926
0.5°	0.9115013
1°	1.2350600
45°	5.2452746
180°	8.5221547

Yaw and Pitch

Yaw (horizontal rotation) and pitch (vertical rotation) are floats that keep track of an entity's head rotation.

Facing is the restriction of the yaw to [-180, 180], as it is represented in F3. Pitch is naturally clamped between [-90, 90].

Mouse movement directly modifies the player's yaw and pitch:

/* In EntityRenderer.java */
public void updateMouseMovement(...)
{
    ... //previous code ignored
</div>

    <div lang="en" dir="ltr" class="mw-content-ltr">
float f = this.mc.gameSettings.mouseSensitivity * 0.6F + 0.2F;
    float mult = f * f * f * 8.0F;
    float dX = (float)this.mc.mouseHelper.deltaX * mult;
    float dY = (float)this.mc.mouseHelper.deltaY * mult;
</div>

    <div lang="en" dir="ltr" class="mw-content-ltr">
int i = 1;
    if (this.mc.gameSettings.invertMouse)
        i = -1;
</div>

    <div lang="en" dir="ltr" class="mw-content-ltr">
... //Applies filters if smooth camera
</div>

    <div lang="en" dir="ltr" class="mw-content-ltr">
this.mc.thePlayer.rotateEntity(dX, dY*i);
}
</div>


<div lang="en" dir="ltr" class="mw-content-ltr">
/* In Entity.java */
public void rotateEntity(float dX, float dY)
{
    this.rotationYaw = this.rotationYaw + dX*0.15);
    this.rotationPitch = this.rotationPitch - dY*0.15;
    this.rotationPitch = MathHelper.clamp(this.rotationPitch, -90.0, 90.0);
}

While the pitch is clamped between -90° and 90°, yaw is not restricted between -180° and 180° as would be expected.

This means that yaw is unbounded, which has some unintended consequences if you deliberately turn in one direction for long enough.

By nature of being a float, its precision becomes worse the bigger it gets, to the point where it becomes noticeably jittery at large values.

When $|yaw|>4194304$ ( ${\textstyle 2^{22}}$ ) it can only increase in increments of 0.5°.
When $|yaw|>8388608$ ( ${\textstyle 2^{23}}$ ) it can only increase in increments of 1°.

At some point, yaw can even mess with movement and stop the player in place.

This is because the yaw gets too large to be converted to a proper angle (see Angles).

This phenomenon happens when $|yaw|\geq 11796480=360\times 2^{15}$ .

Turning even further can crash the game, when ${\textstyle |yaw|>8.59\times 10^{9}}$