sliding window over 2d array in vb.net - vb.net

Question

I'm having problems with sliding a variable sized window over a 2D array in vb.net. my porblem is when I take the first element of the array at 0,0 what ever the size of the window is it needs to be smaller because the element in question has to be the center of the sliding window. ex: arrar size(40,43) window size 5x5 ( window size is NxN N=3 wins size is 3x3) so array(0,0) with win size 5 so 2 col and 2 rows need to be cout out and a new window size of 3x3. any help would be great.`
Public Function getPIXELSinWINDOW(ByVal Wsize As Integer, ByVal x As Integer, ByVal y As Integer)
Dim tempARRAY As New ArrayList()
Dim Xwidth As Integer = Wsize
Dim Yheight As Integer = Wsize
Dim Xvalue As Integer = x - Wsize / 2
Dim Yvalue As Integer = y - Wsize / 2
Dim imgHEIGHT As Integer = Me.mysize.Height
Dim imgWIDTH As Integer = Me.mysize.Width
Dim i, j As Integer
While Xvalue < 0
Xvalue += 1
Xwidth -= 1
End While
While Xvalue > imgWIDTH
Xvalue -= 1
Xwidth -= 1
End While
While Xwidth >= imgWIDTH
Xwidth -= 1
End While
While Xvalue + Xwidth > imgWIDTH
Xwidth -= 1
End While
While Yvalue < 0
Yvalue += 1
Yheight -= 1
End While
While Yvalue > imgHEIGHT
Yvalue -= 1
Yheight -= 1
End While
While Yheight >= imgHEIGHT
Yheight -= 1
End While
While Yvalue + Yheight > imgHEIGHT
Yheight -= 1
End While
For i = Xvalue To Xvalue + Xwidth
For j = Yvalue To Yvalue + Yheight
tempARRAY.Add(pixels(j, i))
Next
Next
Return tempARRAY
End Function
the var pixels is the 2d array

Answer 1

Something like this?
public class MainClass
{
public static void Main (string[] args)
{
MainClass mc = new MainClass();
List<int> pix = mc.GetPixelsInWindow(5, 40, 43);
}
private int[,] data = new int[40, 43];
public List<int> GetPixelsInWindow(int windowSize, int xPoint, int yPoint)
{
// As we are dealing with integers, this will result in a truncated value,
// so a windowSize of 5 will yield a windowDelta of 2.
int windowDelta = windowSize / 2;
List<int> pixels = new List<int>();
int xMin = Math.Max(0, xPoint - windowDelta);
int xMax = Math.Min(data.GetLength(0) - 1, xPoint + windowDelta);
int yMin = Math.Max(0, yPoint - windowDelta);
int yMax = Math.Min(data.GetLength(1) - 1, yPoint + windowDelta);
for (int x = xMin; x <= xMax; x++)
{
for (int y = yMin; y <= yMax; y++)
{
Console.WriteLine("Getting pixel (" + x.ToString() + ", " + y.ToString() + ")...");
pixels.Add(data[x, y]);
}
}
return pixels;
}
}