Draw a trapezium from a file with gdi+

hi

i've downloaded the project : [VB6] GDI+ Usage & Samples

what i'd like to do is similar to "PolygonBlt", but instead of a rectangle, i would like a trapezium

the sample project uses the function "GdipDrawImagePointsRectI" with the coordinates of 3 points to draw a rectangle
i would like to do this with 4 points to draw a trapezium