[Gambas-user] Cairo

[Jussi Lahtinen]

Example drawingarea1.refresh() will trigger the event. And thus, all things
that trigger refresh.
But if the drawingarea is cached, then draw instructions doesn't have to be
inside of event handler.

Jussi


On Wed, Dec 18, 2013 at 6:16 PM, Pino Zollo <pinozollo at ...626...> wrote:

>
> El 18/12/13 11:05, gambas-user-request at lists.sourceforge.net escribió:
> > The code from draw.begin:
> >
> >   Draw.Begin(DrawingArea1)
> >   Rap = Draw.w / 3
> >   DH = Draw.H
> >
> >     ' [GB2:BCOL] DrawingArea1.BackColor = Color.White   ' OK works
> >     DrawingArea1.Background = Color.White
> >
> > ...
> >
> > So, yes, it is between draw.begin and draw.end.
> > But this is not clear if you read the documentation.
> > http://gambasdoc.org/help/comp/gb.qt4/draw?v3
> >
> > Is there way to get error message from compiler?
> >
> > Jussi
> How can a poor programmer imagine that Draw is into qt4 ? there  is not
> an entry from the main list of instructions.
>
> Do you think that this buggy documentation is sufficient ?
>
> for instance...  the documentation of Paint does not mention that it has
> to be inside an event handler...
> I have discovered it experimenting...
>
> The worst for me is that I do not understand why Draw or Paint must be
> inside an event handler...
>
> ...it was not so in Gambas2 ...
>
> Who triggers the event ?...why  ? when ?
>
> How can other classes modify the drawing ?
>
> Please help a simple-minded programmer...
>
> Thanks
>
> Pino
>
>
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