[lazarus] Lazarus Status and "How would I"

[Michael Van Canneyt]

On Thu, 19 Jun 2003, Mattias Gaertner wrote:

> On 17 Jun 2003 18:47:16 -0500
> Matt Henley <mhenley at houston.rr.com> wrote:
>
> > I have been looking at Lazarus lately because Borland's interest in
> > Kylix seems to be on the downside. I have been working on a little
> > project which is to be gpl'd if i ever get it to a stage that is
> > presentable. I have made quite a bit of progress in the background
> > calculation portion and have been working on the user interface and the
> > database interface. The user interface is to be diagram based... like
> > Dia or Visio, where the user drags building blocks onto a canvas and
> > then connects them with lines. Any ideas on how to get started with this
> > type of interface?
>
> There are a lot of possibilities. For example for the diagram you can create
> a new component based on TCustomControl. The drag&drop part could be
> somewhat tricky, as this is not yet complete in the LCL and so you need to
> handle it yourself.
>
>
> > I am more adjusted to the math and simulation portion
> > and am new to the graphics part. Is lazarus and Free Pascal ready to be
> > used for something like this?
>
> I think so.
>
>
> > Are there existing components that could
> > be leveraged for such? Any library that i create I would be willing to
> > license as to be useable by everyone.
> >
> > Second, what is the status of the database components? I am looking to
> > use something like SQLite where a complete database can be saved as one
> > file which looks to the user like a single project file.
>
> I will leave this to the fpc database cracks.

There are many possibilities; I suggest either

- Firebird: There is a low-level API translation and a
  TDataset descendent component available.

- sqlite: We have translated the API header files, so you can
  use it, but no TDataset component yet. Having done the translation,
  I think it should not be hard to implement.

I currently recommend against mysql, since it has a fluctuating
API interface, and people too often report problems.

Michael.