通过X和Y从数组中查找点的索引

Question

I have a problem with finding/soritng points in array. When I want to find the point which is the nearest to the base point (0,0):

CvPoint2D32f[] corners;
...
Cv.FindChessboardCorners(...)
...
int min = Array.IndexOf(corners, corners.Min(p => p.X + p.Y));

and I'm trying to display index of the point - I'm getting "-1" value on textBox, like the the array is empty.

In fact it isn't, because I can display one element from it typing eg.:

this.textBox1.Text = Convert.ToString(corners[0]);

And I'm getting in textBox:

CvPoint2D32f (x:179,143 y:60,15205)

Answer 1

You cant find it because Min returns the sum in this instance and not the object, hence the -1 result.

You will have to loop through it by yourself...

private int IndexOfMinPoint(CvPoint3D32f[] points) {
    int lowestValue = points[0].x + points[0].y;
    int lowestValueIndex = 0;

    for (int i = 1; i < points.length; i++) {

        int newLowestValue = points[i].x + points[i].y;

        if ( newLowestValue < lowestValue) {
             lowestValue = newLowestValue;
             lowestValueIndex = i;
        }

    }

    return lowestValueIndex;    
}