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

[Stephen]

   Yes indeed :)  Using cache mode for each instantiated DrawingArea we 
can manipulate them as desired.
You asked why am I using 10 drawing areas, oddly enough the answer is to 
simplify things from a layout standpoint... didn't figure on having this 
much trouble with it... but persistence (and help) pays off. Now to 
print the darn things.


On 09/03/2014 11:41 AM, Jussi Lahtinen wrote:
> Everything works now?
>
>
> Jussi
>
>
> On Wed, Sep 3, 2014 at 6:28 PM, Stephen<sbungay at ...3301...>  wrote:
>
>>     Uh huh. It figures, almost four hours after the initial post,
>> frustration levels climbing, I sent that email then the solution hits me
>> square between the eyes.
>>
>> Yes use cached mode.
>>
>> On 09/03/2014 11:18 AM, Stephen wrote:
>>> 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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>>>>>
>>>>>
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>> --
>> Kindest Regards
>> Stephen A. Bungay, Prop.
>> Smarts On Site Information Systems
>>
>>
>>
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-- 
Kindest Regards
Stephen A. Bungay, Prop.
Smarts On Site Information Systems