how to save a polygon figure with alpha ~= 1 as vector image, rather than raster image?

Hi guys,

i'm trying to save a polygon (generated by patch or fill) as
a vector image (saveas(gcf, 'test.eps', 'psc2')). I found
that when facealpha is set to 1, then the saved image is a
vector image; however, when i set alpha to other values,
say, 0.2. Then the saved image is a raster image. Is there
an option to make it still can be saved as a vector image?

Thank you
Paul
.

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