Hi, That was my initial approach but it lacked performance.
I have a matrix of this cells. I was laying them out on listiview with a listview inside. In the computer it was OK, but on an iPad 2, it was not. I have already implemented the matrix on scene graph. The performance is incomparable. I now that now I don’t have the fine grain control over appearance without a considerable investment in time but I need need this. Any suggestion? Regards, Nuno > On 11/11/2014, at 12:11, Al-Khanji Louai <louai.al-kha...@theqtcompany.com> > wrote: > > Why not do this directly in QML with Rectangle items? > > -- Louai > > >> -----Original Message----- >> From: interest-bounces+louai.al-khanji=theqtcompany....@qt-project.org >> [mailto:interest-bounces+louai.al-khanji=theqtcompany.com@qt- >> project.org] On Behalf Of Nuno Santos >> Sent: Tuesday, November 11, 2014 1:17 PM >> To: Interests Qt >> Subject: [Interest] Using QSGVertexColorMaterial transparency >> >> Hi, >> >> I want to give a flashing effect on a quad. My idea is to draw two quads. One >> with the base color, and one above it with a white color but with >> transparency oscillating. This will give the flashing effect. >> >> I'm not being able to do it with QSGVertexColorMaterial. There is no opacity >> on quad there is placed above. I have found the following post answer but I >> still can't understand it quite well. >> >> "The blend mode used by the scene graph is glBlendFunc(GL_ONE, >> GL_ONE_MINUS_SRC_ALPHA) which gives you premultiplied blending. A >> "valid" color in premultiplied mode must have r <= a (same for g and b of >> course). If it doesn't, then that color channel will overflow, giving you >> additive blending instead." >> >> Will it be possible to implement this with a QSGVertexColorMaterial? >> >> // quad below >> >> v[0].set(_rect.left(), _rect.bottom(), r, g, b, a); >> v[1].set(_rect.left(), _rect.top(), r, g, b, a); >> v[2].set(_rect.right(), _rect.top(), r, g, b, a); >> >> v[3].set(_rect.left(), _rect.bottom(), r, g, b, a); >> v[4].set(_rect.right(), _rect.top(), r, g, b, a); >> v[5].set(_rect.right(), _rect.bottom(), r, g, b, a); >> >> // flashing quad above >> >> a=128+128*qSin(phase),r=0xff,g=0xff,b=0xff; >> >> v[6].set(_rect.left(), _rect.bottom(), r, g, b, a); >> v[7].set(_rect.left(), _rect.top(), r, g, b, a); >> v[8].set(_rect.right(), _rect.top(), r, g, b, a); >> >> v[9].set(_rect.left(), _rect.bottom(), r, g, b, a); >> v[10].set(_rect.right(), _rect.top(), r, g, b, a); >> v[11].set(_rect.right(), _rect.bottom(), r, g, b, a); >> >> Thanks, >> >> Regards, >> >> Nuno >> >> >> _______________________________________________ >> Interest mailing list >> Interest@qt-project.org >> http://lists.qt-project.org/mailman/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
