Question about PolyPolygon (and all kind of Shape involving several points) with python API

Hello to everyone,

I don't know if this mailing list is also for the scripting abilities of 
LibreOffice. If it's not I appologize.

I have difficulties to create a PolyLineShape using the Pyhton API of 
LibreOffice (in the Draw application).
In fact, I don't know what kind of data structure I have to used for the 
points of the PolyLineShape I want to create.

Here is my code :

====================================================================
from com.sun.star.awt import Point
PolyLineShape = "com.sun.star.drawing.PolyLineShape"

def Test(button):
    document = XSCRIPTCONTEXT.getDocument()

    pages = document.getDrawPages()
    page = pages.getByIndex(0)

    shape = document.createInstance(PolyLineShape)
    page.add(shape)
    shape.setPropertyValue("LineWidth", 50)
    shape.setPropertyValue("LineColor", 0)

    points = (Point(120,340), Point(1200,3400), Point(1200,6000))

    shape.PolyPolygon = points
====================================================================

This code creates a CannotConvertException which seems to mean that a 
tuple or a list is not suitable...
I have tried to use a XIndexAccess object but python tells me the method 
insertByIndex(idx, Point) does not exist...

I am circling for hours now. Does anyone has an idea of how to create a 
PolyLineShape with python ?

Thank you for help :),

Steven