🚀 go-pugleaf

Dear All,

Sorry for this long explanation, but it has to be this long. Please read
it.
I'm working with APW, am relatively new and have a small problem. In this
project, I want to give a student the possibility to enlarge portions of
the displayed bitmap so he can see some things with a better accuracy.
Since I can not work with a high-resolution bitmap as a start (APW accepts
~1000 x 2000 points maximum) I resolved this by making 6 buttons on the
bottom of the screen titled (x't enlargement). If the student pushes one of
these buttons, a full screen bitmap of the enlargement of this part of the
original plot appears, which is in fact a new bitmap. To keep the
application as small as possible I work with a (bitmap) library file.
Sometimes, the button is underneath an unimportant part of the original
image, so I let AW pop up a textbox with the message "Nothing interesting
to enlarge", which saves on application size.

I short, I display the full-size picture (matted with the background),
after which I go into an interaction with six branches plus an exit. The
interaction icon is set to "no erase". Only three of these branches will
erase the original, call on a new picture and call onto the original
picture after the continue button is pushed. Now if I push on an
uninteresting part of the image, the pop-up will come on top of the old
image and disappear again (I made it timed). No sweat sofar. If I now push
a enlargement, the enlargement will replace the original image and I push
the continue, which results in getting back the original picture. Still no
sweat, although this is slow and bumpy for displaying 50 kB B/W bitmaps,
but that may be because I matted them with the background. However IF I NOW
PUSH A UNINTERESTING PART AGAIN, THE PICTURE DISAPPEARS BEFORE THE TEXTBOX
POPS UP, in the end leaving me with a empty display with 6 buttons and an
exit button.

So, AW does not blank the picture if it's called before the interaction,
but does blank it if it's called within the interaction. I don't understand
why, and I do not want it to happen either. Has any of you an answer to the
why or, more importantly, a solution for this problem?

Thanks in advance,
Erik-Jan