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