[Qt-interest] ugly QGraphicsTexItem when it is zoomed

[changwon lee]

  thank you for answer.

but I zoomed view by view api like this.

void MainWindow::sceneScaleChanged(const QString &scale)
{
     //double newScale = scale.left(scale.indexOf(tr("%"))).toDouble() / 
100.0; //I have modified original source code. to use any scale factor.
     double newScale = scale.toDouble();
     QMatrix oldMatrix = view->matrix();
     view->resetMatrix();
     view->translate(oldMatrix.dx(), oldMatrix.dy());
     view->scale(newScale, newScale);
}

just added QGraphicsTextItem (font size1.5) to scene
and scaled using above code.

is this method wrong? (this is example of Qt)

regards

On 2010-09-17 오전 5:00, Jason H wrote:
> Agreed. Don't handle zoom yourself, let Qt do that.
>
>
>
>
> ----- Original Message ----
> From: Constantin Makshin<cmakshin at gmail.com>
> To: Qt Interest<qt-interest at trolltech.com>
> Sent: Thu, September 16, 2010 2:17:25 PM
> Subject: Re: [Qt-interest] ugly QGraphicsTexItem when it is zoomed
>
> Have you tried QGraphicsTextItem::setTextWidth()?
>
> And don't scale/zoom by doing everything (move and resize items, etc.) yourself
> — you're likely to get better results by using QGraphicsView::setTransform().
>
> On Thursday 16 September 2010 18:37:11 changwon lee wrote:
>>    Hello
>>
>> I have attached two pictures.
>> These are the result of modified DiagramScene Example.
>>
>> I have modified two part.
>> one is font size and another is scale;
>> I used float font size and can change scale freely.
>>
>> change_font_size_fix_scale image looks good.
>> it's font size is 48.5 and no scale is applied.
>>
>> fix_font_size_change_scale image looks bad.
>> I have set font size 1.5 and magnified x37.
>>
>> I want to define font size as scene coordinate. if I change scale, text
>> changes with other objects in scene.
>> This is similar to adding text in CAD. User define text size as length
>> in drawing coordinate system.
>> but it seems that my assumption is not true.
>>
>> Do I have to change font size when scale changes?
>>
>> regards
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