[Lazarus] Get JPEG from TAChart in CGI app

[Alexander Klenin]

2011/3/21 Michael Van Canneyt <michael at freepascal.org>:
>> Yes, but, how can I use a TCanvas in a CGI app?
>>
>> If I write:
>>
>> Chart.PaintOnCanvas(TCanvas(lCanvas), Rect(0, 0, 100, 100));
>>
>> I get an Access Violation.

Of course, since you are converting an object to the type it does not belong to.
You should create a TBitmap or another similar object.
Did you look at the savedemo as I proposed in a previous mail?

> Simply said: you can't.
> The current TAChart is not suitable for a CGI application. It expects a GUI.

Why do you think so?
TAChart should be prefectly capable of rendering on bitmap-based canvas.

-- 
Alexander S. Klenin