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List: kde-kimageshop
Subject: Adrian on Painters and Qt4
From: Boudewijn Rempt <boud () valdyas ! org>
Date: 2006-08-30 14:45:43
Message-ID: 200608301645.43740.boud () valdyas ! org
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For archival purposes:
=================
The way the paint system currently works is that you have either a
KisQPaintDeviceCanvas (based on a QWidget) or a KisOpenGLCanvas (based
on a QGLWidget) and you paint on these using a KisCanvasPainter.
KisCanvasPainter has mostly the same API as QPainter, so you can work
with it much as you would a QPainter on a normal widget.
KisQPaintDeviceCanvasPainter implements KisCanvasPainter using a
QPainter internally. In Qt 3, since you can't paint with a QPainter on a
QGLWidget, KisOpenGLCanvasPainter implements the KisCanvasPainter
functions using the direct OpenGL interface. However, since in Qt 4
QPainter can paint on a QGLWidget, KisCanvasPainter should be able to
simply inherit QPainter and there should be no need for
KisOpenGLCanvasPainter or KisQPaintDeviceCanvasPainter. That's how I saw
it going.
=================
--
Boudewijn Rempt
http://www.valdyas.org/fading/index.cgi
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