[Lazarus] Get JPEG from TAChart in CGI app

[Alexander Klenin]

On Mon, Mar 21, 2011 at 22:08,  <michael.vancanneyt at wisa.be> wrote:
>> For starters, the absence of following is most problematic:
>>
>> Canvas.FillRect
>> Canvas.RadialPie
>> Font.Orientation
>
> FillRect and RadialPie can be solved easily. The Font.Orientation can be
> added as a property, I would have to look at FreeType to see how it can be
> implemented. Consider it on the todo list. I can add the missing
> properties/methods quickly, their implementations may take slightly longer
> :-)

Yes, please at least add dummy Orientation property.
Unfortunately, I have to keep compatibility with FPC 2.4.2 until at least
the next Lazarus release, but at least there will be  hope ;-)

I have implemented FPCanvas back-end, (see nogui demo since r29966),
and found the following additional problems:
1) TextSize/TextOut do not work at all (raise ENotImplemented).
2) Clipping is broken (try uncommenting a line after FIXME and see the result)
3) FPCanvasHelper.Assign not implemented -- there exist
  DoCopyProps procedure which does the same, but is protected for some reason.
4) Ploygon/Polyline interface is weaker than in TCanvas,
  and so may require extra array copying
5) TFPImageCanvas has abstract methods(!).
Even standard drawing.pp demo from the fcl-image/examples gives warnings.

-- 
Alexander S. Klenin