On Mon, Mar 21, 2011 at 05:42, Leonardo M. Ramé <[email protected]> wrote: > > [Sun Mar 20 16:30:09 2011] [error] [client ::1] (cgicharts:16246): > Gtk-WARNING **: cannot open display: > [Sun Mar 20 16:30:09 2011] [error] [client ::1] Premature end of script > headers: cgicharts
Unfortunately, I am not an expert in GTK -- it seems that it tries to initialize display even if there is nothing to draw. I am not sure if it is fixable -- the demo I posted does work as a CGI under Apache on Windows, so it may be GTK problem, Lazarus problem, or X-server/GTK/Apache configuration problem. You might want to try fpgui widgetset -- it depends only on X, which may work even if GTK does not. Of course, it would be ideal to create a version of TAChart that does not require a widgetset, but the task is complicated by compatibility requirements. I have already made some progress in this direction -- see IChartDrawer infrastructure. TAChart is mostly independent of TCanvas -- it only needs one for events and interactive tools. Few drawing back-ends exist -- AggPas, OpenGL, and more are planned, in particular SVG, which will probably be most suitable for web apps. Unfortunately, all back-ends have limitations compared to TCanvas (for example OpenGL has very limited text rendering capabilities, and "pure" TFPCanvas does not even support TColor). -- Alexander S. Klenin -- _______________________________________________ Lazarus mailing list [email protected] http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
