API function to get board size?

[nabelekt]

Does pygerber provide a function to get the size of a board given a gerber outline file?
With https://github.com/curtacircuitos/pcb-tools, I could do this:

    import gerber

    gko_file = path/to/some/file
    outline_data = gerber.read(gko_file)

    # Calculate board dimensions
    in_width, in_height = outline_data.size

Here is my implementation using pygerber:

    from pygerber.gerber.parser import parse as gerber_parser  # May need to install with 'pip install git+https://github.com/Argmaster/pygerber' if pip release is not up to date

    gko_file = path/to/some/file    # Read the board outline file
    with open(gko_file, "r") as file:
        outline_data = gerber_parser(file.read())

    # Gather x and y coordinates from outline_data
    xCoords = []
    yCoords = []
    for node in outline_data.nodes:
        if hasattr(node, 'x') and node.x is not None:
            xCoords.append(int(node.x.value))
        if hasattr(node, 'y') and node.y is not None:
            yCoords.append(int(node.y.value))
        if hasattr(node, 'mode'):
            modeName = node.mode.name
            modeValue = node.mode.value
            if modeName != 'IMPERIAL' or modeValue != 'IN':
                exit(f"ERROR: Unit ({modeName}, {modeValue}) not as expected (IMPERIAL, IN)")
        if hasattr(node, 'zeros'):
            xIntegral = node.x_integral
            xDecimal  = node.x_decimal
            yIntegral = node.y_integral
            yDecimal  = node.y_decimal
            if xIntegral != 2 or xDecimal != 5 or yIntegral != 2 or yDecimal != 5:
                exit(f"ERROR: Coordinate notation ({xIntegral}, {xDecimal}, {yIntegral}, {yDecimal}) not as expected (2, 5, 2, 5)")

    # Calculate board width and height from x and y coordinates
    xCoords.sort()
    yCoords.sort()
    x_min = xCoords[0]
    x_max = xCoords[-1]
    y_min = yCoords[0]
    y_max = yCoords[-1]

    board_width_in_e5  = x_max - x_min
    board_height_in_e5 = y_max - y_min

    board_width_mil    = board_width_in_e5  * 1e-2
    board_height_mil   = board_height_in_e5 * 1e-2

    board_width_in     = board_width_mil    * 1e-3
    board_height_in    = board_height_mil   * 1e-3

    board_width_mm     = board_width_mil    * 2.54e-2
    board_height_mm    = board_height_mil   * 2.54e-2

Thanks to the team for your work on this project!

[Argmaster]

So, first of all I would recommend using PyGerber 3.0.0a4 which is not exactly stable but has much nicer API.
Second of all, I don't think it has to be that complicated, you could just render the outline and get size of image rendered from rendering result:

from pygerber.gerber.api import GerberFile
from pathlib import Path

path_to_my_gerber_file = Path().cwd() / "example.grb"

gerber_file = GerberFile.from_file(path_to_my_gerber_file)

image = gerber_file.render_with_pillow()
space = image.get_image_space()
print(space.width_mm, space.height_mm)

[nabelekt]

Thanks. It would be great if the API provided a single function call to do this.