PyOO/Uno: export chart to PNG.

example.py

import pyoo
import uno

def export_image(context, element, path):
    """
    Export the given element to an image.
    """

    manager = context.getServiceManager()

    # Choose drawings which you want to export.
    collection = manager.createInstanceWithContext(
        "com.sun.star.drawing.ShapeCollection", context)
    collection.add(element)

    # Prepare the export arguments.
    url = uno.systemPathToFileUrl(os.path.abspath(path))
    args = [
        PropertyValue("MediaType", 0, "image/png", DIRECT_VALUE),
        PropertyValue("URL", 0, url, DIRECT_VALUE)
    ]

    # Start exporting.
    graphic_filter = manager.createInstanceWithContext(
        "com.sun.star.drawing.GraphicExportFilter", context)
    graphic_filter.setSourceDocument(collection)

    return graphic_filter.filter(tuple(args))
    
# Usage:
desktop = pyoo.Desktop("localhost", 2002).
sheet = desktop.open_spreadsheet("/tmp/spreadsheet.xlsx").sheets[0]
chart = sheet.charts[0]
element = chart._target.getEmbeddedObject().getDrawPage().getByIndex(0)

export_image(desktop.remote_context, element, "/tmp/file.png")