[Qt-interest] Qt-interest Digest, Vol 6, Issue 142

[Stefanos Antaris]

Stefanos Antaris wrote:
> qt-interest-request at trolltech.com wrote:
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>> Today's Topics:
>>
>>    1. Re: draw a pixmap with a table (Ender EREL)
>>    2. QT and SNMP NMS (Kosta)
>>    3. Data has to be valid on rowsAboutToBeRemoved? (Emil Eriksson)
>>    4. Re: Data has to be valid on rowsAboutToBeRemoved? (Arnold Krille)
>>    5. Need help: Build qt 4.5.1 for Mac OS X leopard (10.5.7) with
>>       cocoa but get library for carbon (Lei Zhang)
>>    6. Re: Communication Problem (Tim W)
>>    7. QTableView/QSqlTableModel: how to set order of	columns in
>>       header ? (Stephen Collyer)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Fri, 15 May 2009 17:57:37 +0300
>> From: Ender EREL <erelender at yahoo.com>
>> Subject: Re: [Qt-interest] draw a pixmap with a table
>> To: qt-interest at trolltech.com
>> Message-ID: <gujvt2$i19$1 at eple.troll.no>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> Stefanos Antaris wrote:
>>   
>>> Hello.I am going to receive a 2 dimension table which is going to have 
>>> unsigned char on each cell.Every cell is going to show me the brightness 
>>> of the pixels.Now i found that QPixmap can do that but i can't manage 
>>> it.Can anyone help me how could i draw a widget with that table?With 
>>> QPixmap or something else?Thanks.
>>>     
>>
>> First, create a QImage with the size of your table.
>> Second, set value of each pixel using myImage.setPixel(x,y,value).
>> Then, set pixmap of a label using 
>> mylabel->setPixmap(QPixmap::fromImage(myImage));
>>
>> A little reference from the Assistant can answer a lot of questions.
>>
>>   
> Ok.Assistant really helps but what i have to do is to receive an 
> unsigned char table.Every cell has only one value.Not three.The qt 
> assistant's example take a qRgb value and the pixels is shown using 
> that value.What i have to do is to turn the unsigned char to Ascii and 
> put this value to each pixel.If i am doing this my example crash.Here 
> is my code.
> [code]
>     QImage img(500,500,QImage::Format_Indexed8);
>     for(i=0;i<500;i++)
>         for(int k=0;k<500;k++){
>             QChar c = (QChar)testMap[i][k];
>             img.setPixel(i,k,c.toAscii());
>             ui->showMapLabel->setPixmap(QPixmap::fromImage(img));
>         }
>
> [/code]
> Any help?

One more think.I want to do it on grayscale.I tried to paint the label 
just on one pixel but it shows me a lot of colors.And it is shown in all 
the QLabel.Not on a pixel.
Co
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