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import numpy as np

def compute_xy_from_pixelID(pixelID, start_index, Nx, Ny, xwidth, yheight, dx, dy):

    """

    Compute the (x, y) positions from the given pixelID.

    Parameters:

    - pixelID (array or scalar): The pixel index array.

    - start_index (int): The starting pixel index.

    - Nx (int): Number of pixels in the x-direction.

    - Ny (int): Number of pixels in the y-direction.

    - xwidth (float): Total width of the detector.

    - yheight (float): Total height of the detector.

    - dx (float): Pixel size in the x direction.

    - dy (float): Pixel size in the y direction.

    Returns:

    - x (array or scalar): Computed x positions.

    - y (array or scalar): Computed y positions.

    """

    # Compute xindex and yindex

    xindex = (pixelID - start_index) // Ny

    yindex = (pixelID - start_index) % Ny

    # Compute x and y positions

    x = xindex * dx - (xwidth / 2)

    y = yindex * dy - (yheight / 2)

    return x, y

# # Example Usage:

# pixelID = np.array([100, 200, 300, 400])  # Example pixel IDs

# start_index = 0

# Nx = 8  # Example: Number of x pixels

# Ny = 128  # Example: Number of y pixels

# xwidth = 0.21

# yheight = 0.834

# dx = 0.021

# dy = 0.0064

#

# # Compute x, y

# x, y = compute_xy_from_pixelID(pixelID, start_index, Nx, Ny, xwidth, yheight, dx, dy)

# print("x:", x)

# print("y:", y)

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