strange box-offset

[Mojca M. <moj...@gm...>]

Hello,

Can you please take a look at http://pub.mojca.org/gnuplot/bug/box-offset.png?

The source is available in the same folder. Some boxes have an
additional frame offset by 1 pixel, which seems pretty strange to me.
This only happens at some specific sizes and some specific plots.

When I tried the same example with the ConTeXt terminal (might be just
any text-based terminal) I spotted the following in the output:

fill unitsquare xyscaled (2.04,32.09) shifted (52.15,18.03);
draw (52.15,18.03)--(52.15,50.11)--(54.18,50.11)--(54.18,18.03)
	--(52.15,18.03)--cycle;

32.09+18.03=50.12, but the rectangle is filled up to 50.11

There seems to be a round-off problem.

Mojca