52 lines
2.2 KiB
Plaintext
52 lines
2.2 KiB
Plaintext
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
|
|
** Contact: http://www.qt-project.org/legal
|
|
**
|
|
** This file is part of the documentation of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:FDL$
|
|
** Commercial License Usage
|
|
** Licensees holding valid commercial Qt licenses may use this file in
|
|
** accordance with the commercial license agreement provided with the
|
|
** Software or, alternatively, in accordance with the terms contained in
|
|
** a written agreement between you and Digia. For licensing terms and
|
|
** conditions see http://qt.digia.com/licensing. For further information
|
|
** use the contact form at http://qt.digia.com/contact-us.
|
|
**
|
|
** GNU Free Documentation License Usage
|
|
** Alternatively, this file may be used under the terms of the GNU Free
|
|
** Documentation License version 1.3 as published by the Free Software
|
|
** Foundation and appearing in the file included in the packaging of
|
|
** this file. Please review the following information to ensure
|
|
** the GNU Free Documentation License version 1.3 requirements
|
|
** will be met: http://www.gnu.org/copyleft/fdl.html.
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
/*!
|
|
\example painting/deform
|
|
\title Vector Deformation
|
|
|
|
\brief This example shows how to use advanced vector techniques to draw text
|
|
using a \c QPainterPath.
|
|
|
|
\image deform-demo.png
|
|
|
|
We define a vector deformation field in the shape of a lens and apply
|
|
this to all points in a path. This means that what is rendered on
|
|
screen is not pixel manipulation, but modified vector representations of
|
|
the glyphs themselves. This is visible from the high quality of the
|
|
antialiased edges for the deformed glyphs.
|
|
|
|
To get a fairly complex path we allow the user to type in text and
|
|
convert the text to paths. This is done using the
|
|
QPainterPath::addText() function.
|
|
|
|
The lens is drawn using a single call to QPainter::drawEllipse(),
|
|
using a QRadialGradient to fill it with a specialized color
|
|
table, giving the effect of the sun's reflection and a drop
|
|
shadow. The lens is cached as a pixmap for better performance.
|
|
*/
|