Fill with alpha value

[rion10 <astar_ly yahoo com cn>]

hi all
  I use ::gdk_draw_rectangle(mPixmap, mGC, false, x, y, width, height)
function to draw a rectangle which filled with fore color.
  Now the fill will be performed using the alpha value of the forecolor,
does anyone know how could I do it?
 and any hint or suggestion will be highly appreciate!
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