获取鼠标移动的距离 [英] Get the distance of mouse movement

问题描述

我有一个表格，里面我有一个小的面板名为播放。我怎样才能链接面板用户的鼠标，所以它会移动，鼠标移动？

I have a form and inside it I got a small Panel called Player. How can I "link" the panel to user's mouse, so it will move as the mouse moves?

我已经订阅 Player_MouseMove 到 Player.MouseMove 事件，但我想不出有多少有鼠标实际移动。只有这样我能想出的是有一个这样的：

I've already subscribed Player_MouseMove to Player.MouseMove event but I can't figure out how much has the mouse actually moved. Only way I can come up with is to have a such:

private Point previousLocation;

private void Player_MouseMove(object sender, MouseEventArgs e)
{
    int differenceX, differenceY;
    differenceX = e.X - previousLocation.X;
    differenceY = e.Y - previousLocation.Y;
    previousLocation = e.Location;
}

这似乎是pretty的愚蠢，有一个额外的变量，并计算不同的每次。完美的方式会像 Player.LinkToCursor（）; 或者这样的，但是如果没有自动化的方式，是有ATLEAST一个更好的办法

This seems pretty stupid, having an extra variable and calculating the difference everytime. Perfect way would be like Player.LinkToCursor(); or such, but if there's no automated way, is there atleast a better way?

推荐答案

看的 http://msdn.microsoft.com/en-us/library/system.windows.forms.mouseeventargs.aspx 我看不到任何东西，这将有助于你得到这个工作更好

Looking at http://msdn.microsoft.com/en-us/library/system.windows.forms.mouseeventargs.aspx I can't see anything that would help you get this done any better.

然而，有一件事你可以做：

There is however one thing you could do:

Point difference = e.Location - (Size)previousLocation;

矢量算术;）

Vector-arithmetics ;)

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