Qt-interest Archive, September 2007
QGraphicsItem semi-transparent
Message 1 in thread
Anybody know if there is a way to make a QGraphicsItem (and in particular a QGraphicsPixmapItem) semi-transparent?
I can't found a way to change the opacity of an item...
Thanks!
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Message 2 in thread
1. Get the brush of the item.
2. Set the color with alpha value (0-255)in the brush.
This will give you transparency!
-----Original Message-----
From: fabiodago@xxxxxxxxx [mailto:fabiodago@xxxxxxxxx]
Sent: Tuesday, September 04, 2007 7:08 PM
To: qt qt
Subject: QGraphicsItem semi-transparent
Anybody know if there is a way to make a QGraphicsItem (and in
particular a QGraphicsPixmapItem) semi-transparent?
I can't found a way to change the opacity of an item...
Thanks!
------------------------------------------------------
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Message 3 in thread
You can inherit from the item you want (pixmap in your case) and override
the paint() method to set the opacity of the painter before doing the real
painting.
Something like this:
void paint(QPainter * painter, const QStyleOptionGraphicsItem* option,
QWidget* widget)
{
painter->setOpacity(0.5);
QGraphicsPixmapItem::paint(painter, option, widget);
painter->setOpacity(1.0);
}
I hope this helps.
Sebastien Grignard
"fabiodago@xxxxxxxxx" <fabiodago@xxxxxxxxx> a Ãcrit sur 04/09/2007 15:38:29
:
> Anybody know if there is a way to make a QGraphicsItem (and in
> particular a QGraphicsPixmapItem) semi-transparent?
>
> I can't found a way to change the opacity of an item...
>
> Thanks!
>
>
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> Leggi GRATIS le tue mail con il telefonino i-modeâ di Wind
> http://i-mode.wind.it/
>
>
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Message 4 in thread
And how I can get the brush of a QGrapicsItem?
---------- Initial Header -----------
From : "Prateek Tiwari" ptiwari@xxxxxxxxxxx
To : fabiodago@xxxxxxxxx,"qt qt" qt-interest@xxxxxxxxxxxxx
Cc :
Date : Wed, 5 Sep 2007 10:01:12 +0530
Subject : RE: QGraphicsItem semi-transparent
> 1. Get the brush of the item.
> 2. Set the color with alpha value (0-255)in the brush.
>
> This will give you transparency!
>
> -----Original Message-----
> From: fabiodago@xxxxxxxxx [mailto:fabiodago@xxxxxxxxx]
> Sent: Tuesday, September 04, 2007 7:08 PM
> To: qt qt
> Subject: QGraphicsItem semi-transparent
>
> Anybody know if there is a way to make a QGraphicsItem (and in
> particular a QGraphicsPixmapItem) semi-transparent?
>
> I can't found a way to change the opacity of an item...
>
> Thanks!
>
>
> ------------------------------------------------------
> Leggi GRATIS le tue mail con il telefonino i-mode(tm) di Wind
> http://i-mode.wind.it/
>
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
> "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/
>
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Message 5 in thread
fabiodago@xxxxxxxxx skrev:
> And how I can get the brush of a QGrapicsItem?
>
I think what he was trying to say is that you have to make sure the
colors used to paint the item are semitransparent. There is no way to
add transparency on an item, you have to do it with the painting.
Bo.
>
> ---------- Initial Header -----------
>
> From : "Prateek Tiwari" ptiwari@xxxxxxxxxxx
> To : fabiodago@xxxxxxxxx,"qt qt" qt-interest@xxxxxxxxxxxxx
> Cc :
> Date : Wed, 5 Sep 2007 10:01:12 +0530
> Subject : RE: QGraphicsItem semi-transparent
>
>
>
>
>
>
>
>
>> 1. Get the brush of the item.
>> 2. Set the color with alpha value (0-255)in the brush.
>>
>> This will give you transparency!
>>
>> -----Original Message-----
>> From: fabiodago@xxxxxxxxx [mailto:fabiodago@xxxxxxxxx]
>> Sent: Tuesday, September 04, 2007 7:08 PM
>> To: qt qt
>> Subject: QGraphicsItem semi-transparent
>>
>> Anybody know if there is a way to make a QGraphicsItem (and in
>> particular a QGraphicsPixmapItem) semi-transparent?
>>
>> I can't found a way to change the opacity of an item...
>>
>> Thanks!
>>
>>
>> ------------------------------------------------------
>> Leggi GRATIS le tue mail con il telefonino i-mode(tm) di Wind
>> http://i-mode.wind.it/
>>
>>
>> --
>> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
>> "unsubscribe" in the subject or the body.
>> List archive and information: http://lists.trolltech.com/qt-interest/
>>
>> --
>> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.
>> List archive and information: http://lists.trolltech.com/qt-interest/
>>
>>
>
>
> ------------------------------------------------------
> Leggi GRATIS le tue mail con il telefonino i-mode™ di Wind
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>
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