How close does the door go to the bath? If you put a stopper on the side of the bath you could get one of these screens
http://www.bunnings.com.au/products_product_fixswing-bath-screen-500x400-silver-m2_P5137105.aspx?search=shower&page=7
or...
it looks like a Roman bath - my grandparents had one and I used to cringe that anyone would sit on the tiles for a bath.
Basically all it was was extra high sides on the shower bottom.