using canvas for presenting stimuli

[Svetlana V Gromenkova]

Hello,
Does anybody know if it's possible to present stimuli via an Image or
Slide display which would use a canvas object defined in an Inline
script?
The problem is that I have a lot of different stimuli with random
shapes, colors and locations on the screen. They are easily created by
writing E-basic script, but then I'd like to present the created canvas
using a standard Image or Slide object, because it's much easier for
timing, data collection, etc.
It seems though that I have to use files only as images with these
objects. Does anybody know a way to avoid this and use a canvas?
Thanks.
Svetlana.