[Gambas-user] A few questions.

[Henri Girard]

Petit papa Noel :)
Man could you please let us have a test of your povray thing ?
I use wine for the windows version of povray on linux,
and a gambas viewer would be nice :)
Henri
----- Original Message -----
From: "Benoit Minisini" <gambas at ...1...>
To: <gambas-user at lists.sourceforge.net>
Sent: Wednesday, December 22, 2004 11:05 AM
Subject: Re: [Gambas-user] A few questions.


> On Wednesday 22 December 2004 00:53, Oliver Stieber wrote:
> > Hi,
>
> Hi,
>
> > I'm a bit of an old-skool vb progammer, I've used VB
> > since version 2 and even the dos version! and I've
> > been trying to get to grips with Gambas with the hopes
> > of porting some of my old work.
>
> Welcome to Gambas :-)
>
> >
> >
> > Anyhow, I've been having a few teething problems.
> >
> > 1: How do I create a type safe array of object and
> > pass it as a parameter to a function e.g.
> >
> > public sub dosomething(optional things as type[] =
> > null)
> >
>
> You can't.
>
> >
> >
> > 2: I've tried a 'work around' of creating a class
> > types that inherits object[], I've overridden? the add
> > function so that I can add a key and value (I know I
> > can do this with a collection, but I want to be able
> > to get the keys back too)
> >
> > PUBLIC SUB add(key AS String, value AS Variant)
> >  DIM aparam AS  Object
> >  aparam = NEW parameter(key,value)
> >
> > which is find, but how do I call the object[] to add
> > I've tried  add(aPARAM)  but it doesn't work...
>
> You can do what you did in your next mail, or you can put the array inside
> your class as a private dynamic variable, without using inheritance.
>
> >
> > Also when I try to perform array access on my class it
> > fails, reporting class is not an array.
>
> It is actually possible by defining the "_get" method, but I disabled it
for
> the 1.0 version.
>
> PUBLIC FUNCTION _get(Index AS Integer) AS <Type>
>
> will raise an error while compiling.
>
> >
> >
> > 3: I've also been playing around with some graphics
> > and couldn't find a way to read the value of a pixel,
> > is this possible?
>
> First, you must understand the difference between a picture stored on the
X
> Server (Picture class) and a picture stored in the process memory (Image
> class). You can only modify a pixel on an Image object. To modify a pixel
on
> a Picture object, you must: convert the Picture to an Image, modify the
> pixel, and then convert the Image to the Picture - It is a very heavy
> process!
>
> >
> >
> > 4: where can I request some which list functions...
> > the kind of things I always seem to re-write, like
> > (and I know this is a hack)
> >
> > PUBLIC FUNCTION ang(xvalue AS Float, yvalue AS Float)
> > AS Float
> >
> >   DIM tanvalue AS Float
> >   IF xvalue = 0 THEN
> >     tanvalue = 90
> >   ELSE
> >     tanvalue= Deg(ATan(yvalue/xvalue))
> >   END IF
> >   IF tanvalue < 0 THEN tanvalue = tanvalue + 360
> >   IF xvalue > 0  THEN
> >     tanvalue = tanvalue + 180
> >   END IF
> >   IF tanvalue > 360 THEN tanvalue = tanvalue - 360
> >
> >   RETURN tanvalue
> >
> > END
> >
> > and
> >
> > PUBLIC FUNCTION mag(xvalue AS Float, yvalue AS Float)
> > AS Float
> >
> >   RETURN  Sqr(xvalue*xvalue + yvalue*yvalue)
> >
> > END
> >
>
> There - I will insert them in the TODO list.
>
> Note that I try to keep the interpreter size under 150K, so I don't try to
> insert as many functions as possible inside.
>
> What does exactly your ang() function ?
>
> >
> > 5: I've also done C/C++ for quite a few years too so I
> > don't mind helping out where I can (though I don't
> > really have time to get drawn into to many projects)
>
> Come on :-)
>
> >
> > 6: While I'm porting the apps I'll try to keep a log
> > of VB->Gambas issues and try to periodically
> > consolidate things, I'll post it as I go if you want.
>
> Very good idea.
>
> >
> > 7: The apps are old but quite interesting (no db stuff
> > thought, mostly VB3 he he) and are as follows.
> >
> > A full GUI fractal landscape, tree and vista generator
> > for povray, featuting FFT, many 2d graphic
> > manipulation functions, 3d preview and that kind of
> > thing, all in vb3, with some c helper libraies (that I
> > can redo in VB).
> >
> > screen short here
> > http://www.oliverthered.f2s.com/fractalworlds/
> >
> > A simple visual component based logic simulator(put
> > lots of gates on the form, join the inputs and
> > outputs).
> >
> > A photograpic database (for photographers), a standard
> > database but with spline based vector graphics for
> > modeling you set.
> >
> >
> > Loads of other stuff too, adventure game generators,
> > AI's to solve mine-sweeper, maybe the odd byte code
> > interpreter, a RTF WISIWYG editor. that kind of thing.
> >
> >
> > Your more than welcome to include any of the
> > applications/demos with Gambas, they haven't made me
> > any money over the past 15 years(but they've got me a
> > quite a few jobs!).
> >
>
> Tell me when you succeed in your port, I think they could be become very
good
> examples!
>
> Regards,
>
> --
> Benoit Minisini
> mailto:gambas at ...1...
>
>
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
> http://productguide.itmanagersjournal.com/
> _______________________________________________
> Gambas-user mailing list
> Gambas-user at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gambas-user
>