如何测量对角线距离点? [英] How can I measure diagonal distance points?

问题描述

我可以计算水平和垂直点，但无法弄清楚如何使用对角线点计算距离.有人可以帮我吗?

I can compute horizontal and vertical points, but I cant figure out how to compute distance using diagonal points. Can someone help me with this.

这是我的水平和垂直测量的代码:

here's the code for my horizontal and vertical measuring:

private float ComputeDistance(float point1, float point2) 
{
        float sol1 = point1 - point2;
        float sol2 = (float)Math.Abs(Math.Sqrt(sol1 * sol1));

        return sol2;
}

protected override void OnMouseMove(MouseEventArgs e)
    {

        _endPoint.X = e.X;
        _endPoint.Y = e.Y;

        if (ComputeDistance(_startPoint.X, _endPoint.X) <= 10)
        {
            str = ComputeDistance(_startPoint.Y, _endPoint.Y).ToString();
        }
        else
        {
            if (ComputeDistance(_startPoint.Y, _endPoint.Y) <= 10)
            {
                str = ComputeDistance(_startPoint.X, _endPoint.X).ToString();
            }
        }
    }

假定已设置_startPoint.

Assuming that the _startPoint has been already set.

在此图像中，对角点显然是错误的.

In this image the diagonal point is obviously wrong.

推荐答案

您需要使用毕达哥拉斯定理.

You need to use Pythagoras' theorem.

d = Math.Sqrt(Math.Pow(end.x - start.x, 2) + Math.Pow(end.y - start.y, 2))

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