确定两个点附近 [英] Determine If Two Points Are Near

问题描述

我有以下几点：

bool AreNear(Point Old, Point Current)
{
    int x1 = Convert.ToInt32(Old.X);
    int x2 = Convert.ToInt32(Current.X);
    int y1 = Convert.ToInt32(Old.Y);
    int y2 = Convert.ToInt32(Current.Y);
    if (x1 == x2) {
        if (y1 == y2) {
            return true;
        }
    }
    return false;
}

我想在函数返回true，如果当前点为25像素老一点的半径。谁能告诉我该怎么做？

I want to return true in the function if the current point is in 25 pixels radius of the old point. Can anyone tell me how to do that?

推荐答案

您可以使用毕达哥拉斯公式<​​/一>来计算两个点之间的距离。在C＃：<​​/ P>

You can use the Pythagorean formula to calculate the distance between two points. In C#:

var d = Math.Sqrt(Math.Pow(x1 - x2, 2) + Math.Pow(y1 - y2, 2)) 

为什么这项工作？看看下面的图，并记住 A ^ 2 + B ^ 2 = C ^ 2 保存为直角三角形：

Why does this work? Have a look at the following diagram and remember that a^2 + b^2 = c^2 holds for right triangles:

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