[Gambas-user] Drawing Areas, painting on them, and printing the results...

[Stephen]

On 09/02/2014 06:22 PM, Jussi Lahtinen wrote:
>> I guess it is the need to use the draw event in order to do anything
>> with the drawing area that had me spun. I think in terms of methods,
>> properties and events, but I do not think in terms of events being the
>> very thing that actually does the work.
>>
> Draw event is called every time drawingarea needs to be drawn.
    Yes, so we force the event by the refresh method. I'm slowly making 
progress... documenting things as I go. Thank you taking the time to help.

> Thus it is
> where you put the drawing commands.
>
> But you can change this behavior by setting Cached property to True.
> Then you start painting by determining painting device (Gambas cannot know
> where to draw, if you are not in specific drawing event)
> Paint.Begin(hNameOfPaintingDevice) and end with Paint.End.
> See the documentation.
>
>
>
>
>> I'm thinking of it now in terms of Macros, using the Object.Call(me,
>> $sFunctionName) treats the code in $sFunctionName like a Macro, (am I on
>> the right track?) Flexible&  powerful yes. Intuitive in it's usage, not
>> so much.
>>
> This only enables you to use string value to call a function. There are
> many alternatives for this.
>
>
>
>
>> One of the things that really confused me was the paint.reset command
>> telling me it had no device.... ummm... no "device"? To me a device is a
>> piece of hardware, a printer, a modem, a screen, keyboard, mouse,
>> soundcard, NIC, Com port etc.
>
> In Unix/Linux device has bit broader meaning, see example /dev/null or
> /dev/random. Not all devices are physical devices.
>
>
>
>
>> BTW, how does reset differ from clear?
>>
> http://gambaswiki.org/wiki/comp/gb.qt4/drawingarea/clear
> http://gambaswiki.org/wiki/comp/gb.qt4/paint/reset
>
>
>
> Jussi
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-- 
Kindest Regards
Stephen A. Bungay, Prop.
Smarts On Site Information Systems