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

[Stephen]

Paint.Begin and use cached mode? Trying that now.

On 09/03/2014 11:14 AM, Stephen wrote:
>     Typographical error in the code (not that it is causing a problem).
> This line
>
>     mDrawingAreaMatrix[X] = NEW DrawingArea(Panel1) AS "Card"&  CInt(X)
>
> CInt(X) is redundant and not at all what I was thinking about when I
> typed that line. It should more properly read;
>
>     mDrawingAreaMatrix[X] = NEW DrawingArea(Panel1) AS "Card"&  CStr(X)
>
>     I'm beginning to think that what I am trying to accomplish is not
> possible. How can a Draw event that is not in the compile-time source be
> accessed during run-time?
>
> On 09/03/2014 06:39 AM, Stephen wrote:
>>    Attached is a sample project that dynamically instantiates 10
>> business card sized DrawingAreas within a Panel on a forum. The form
>> represents a North American letter-sized sheet of paper. Since the
>> Draw event must be used to draw within each of the Drawing areas, and
>> the the Drawing Areas are brought into existence at run-time, the
>> question is how to draw something on them?
>>
>>    The actual project uses a database to dynamically create (or
>> re-create) QR or Barcode images.
>>
>> Steve.
>>
>> On 09/02/2014 07:05 PM, Stephen wrote:
>>> 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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>>
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>


-- 
Kindest Regards
Stephen A. Bungay, Prop.
Smarts On Site Information Systems