[REBOL] Some other questions
From: WisD00M::gmx::net at: 22-Nov-2003 5:47
I hope you guys don't mind me asking some other questions I have come up
with meanwhile.
1) If I have an object - how do I create an array of objects with it ?
for example
chicken: make object! [
tasty: "wings"
]
now I would want to have an array of objects of that type.
I tried it like that:
chickenfarm: make chicken [] array 10
It doesn't seem to work that way, though ?
I've read all stuff available about objects and array on the REBOL pages,
but either I'm blind or there isn't anything about creating an array
of objects ?
2) How do you create custom types ?
I am talking of a way to emulate the typedef behavour in C ?
How would you go to create an "enum" type in REBOL ?
3) Back on objects:
objects seem to be pretty neat in REBOL - but I didn't find anything about
implementing
and using constructor/destructors ?
I know I could manually add a function that serves as constructor each time
I create an object, but is that the way REBOL requires it ?
4) In the same context:
how do I actually 'free' memory/variables ?
5) On the webpage about objects one passage mentioned that "sub-objects"
don't get cloned-
what does that mean ? Reading that I would expect that all objects within an
object aren't
available when I create an object on the basis of that object.
But I seem to be able to use it anyway. Maybe I am getting something wrong
here ?
6) in VIEW/VID: How do you open/create several windows simultaneously ?
I am also talking of being able to refresh each window.
7) Trying to find a solution to the problem above I looked around the REBOL
webpages
and searched for a possibility to create threads - there doesn't seem to be
anything
like that - how is "parallel processing" achieved in REBOL ?
How would you update a dialog but also keep a timer running as well as
rotating an
image ?
8) On image rotation: is there any simple way to overcome the 90°
restriction -
I am not tallking of bitshifting manually ;-)
What's the reason for this restriction ?
9) Image creation/processing
I read it would be possible to create images on the fly and work with these
then -
is it possible to store an entire (view) layout within such an image ?
Could you for example draw a line on a "virtual" view and save this then to
an
image file ?
Or would you rather simply take the coordinates of the line and create the
image with that data ?
10) Image processing
Is it possible to create new images (in memory) by adding other images
to the original image at certain coordinates ?
Having tried to overlay transparent GIFs in a VIEW layout, I noticed
the transparency attribute doesn't seem to be preserved ?
At least transparent areas of my GIF didn't show the image below that
one, but rather a WHITE area.
IF transparent GIFs are supported: what do you need to do to really display
them properly ?
11) VID controls
If I need certain additional features for a basic control - like a progress
bar or slider,
how do I add these ? Do I need to edit the dialect ?
For example, I want a progress bar with tic-marks as well as a non-continous
filling of the bar.
So, is there any way to "sub-class" controls easily to enhace their
functionality/appearance without having to re-write everything from scratch?
12) Is there any really thorough information available on ACTIONS and EVENTS
with REBOL/VIEW ?
They documentation on the REBOL pages seems a bit 'poor' on that matter.
I don't know yet, how these things are really done behind the scenes.
13) I didn't see any designated function to set pixels at certain
coordinates in a layout-
my workaround was using the line word - with 1 width/height.
How is this really done ?
14) How do I catch mouse events - such as a mouseover event ?
I read about 'over' - it seems to do exactly what I need - I want to display
controls in a certain area only when the mouse cursor is in that said area.
Also, that functionality could be used to add tooltip-like behaviour to
buttons
and menus.
Again: thanks for your help and patience folks - it's really appreciated !!
--
regards
_________________
---------
Mike
NEU FÜR ALLE - GMX MediaCenter - für Fotos, Musik, Dateien...
Fotoalbum, File Sharing, MMS, Multimedia-Gruß, GMX FotoService
Jetzt kostenlos anmelden unter http://www.gmx.net
+++ GMX - die erste Adresse für Mail, Message, More! +++
