On 07/01/2010 05:46 AM, Simon Webster wrote:
Dear Free Pascallers,
I'm wanting to convert a Turbo Pascal program to fpc, to run
(ultimately) under linux, although I'm actually developing on a mac,
and using virtualbox to run ubuntu. The program in question is a
relatively large non OOP program which makes substantial use of BGI
graphics. I'm wondering what would be the best/easiest way of
achieving this?
I tried using the graph unit& svgalib under a virtualized ubuntu, but
even the simplest test program (InitGraph, putpixel, CloseGraph)
produces a runtime error 216. Even if I got this working, I get the
feeling that directly bashing the graphics hardware in such a
primitive way is not the best way to go.
Ideally I would like to be able to just open a large window that I can
use as a bitmap for all my graphics drawing, ideally using graph unit
syntax compatible functions. What's the simplest way to do this - I
tried looking in the documentation but don't really know where to
start. Do I need to use 'Lazarus' if I want to open a window? I've no
experience with Delphi or Object Pascal so that whole aspect of fpc is
completely alien to me.
Many thanks in advance for any help,
Simon
You can check out the latest development version of ptcpas, which has a
BGI-compatible graph unit, called ptcgraph, implemented on top of
ptcpas. It's heavily based on the fpc graph unit, namely it uses the
same platform-independent .inc files, where all the drawing algorithms
are implemented. Ptcgraph currently works under X11 and Windows - both
windowed and fullscreen. (ptcpas also supports DOS, but ptcgraph does
not support it yet, due to lack of threading support)
It's still a work in progress and I started to work on it only recently,
so it's not completely finished yet - only 16-colour (or less) modes are
supported as of now, but I can easily add 256-colour and 65536-colour.
(however the original BGI drivers that came with Turbo Pascal 7 only
supported up to 16-colours, so that's why I'm focusing on it now)
The example programs from TP7 - bgidemo.pas and arty.pas run perfectly
with ptcgraph.
The PTCPas website is:
http://ptcpas.sourceforge.net/
Since ptcgraph is new, it's still not included in the latest stable
release of ptcpas, so you need to get the latest development version via
svn:
svn co https://ptcpas.svn.sourceforge.net/svnroot/ptcpas/trunk ptcpas
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