From kde-kimageshop  Wed Aug 30 14:45:43 2006
From: Boudewijn Rempt <boud () valdyas ! org>
Date: Wed, 30 Aug 2006 14:45:43 +0000
To: kde-kimageshop
Subject: Adrian on Painters and Qt4
Message-Id: <200608301645.43740.boud () valdyas ! org>
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=46or archival purposes:

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

The way the paint system currently works is that you have either a=20
KisQPaintDeviceCanvas (based on a QWidget) or a KisOpenGLCanvas (based=20
on a QGLWidget) and you paint on these using a KisCanvasPainter.=20
KisCanvasPainter has mostly the same API as QPainter, so you can work=20
with it much as you would a QPainter on a normal widget.=20
KisQPaintDeviceCanvasPainter implements KisCanvasPainter using a=20
QPainter internally. In Qt 3, since you can't paint with a QPainter on a=20
QGLWidget, KisOpenGLCanvasPainter implements the KisCanvasPainter=20
functions using the direct OpenGL interface. However, since in Qt 4=20
QPainter can paint on a QGLWidget, KisCanvasPainter should be able to=20
simply inherit QPainter and there should be no need for=20
KisOpenGLCanvasPainter or KisQPaintDeviceCanvasPainter. That's how I saw=20
it going.

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=2D-=20
Boudewijn Rempt=20
http://www.valdyas.org/fading/index.cgi

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