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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "q3painter.h"
#include "qpaintengine.h"
#include <private/qpainter_p.h>
QT_BEGIN_NAMESPACE
/*!
\class Q3Painter
\brief The Q3Painter class is a Qt 3 compatibility wrapper for QPainter.
\compat
Prior to Qt 4, QPainter specialized the pen drawing for rectangle
based functions (in particular: drawRect, drawEllipse,
drawRoundRect, drawArc, drawChord and drawPie). When stroking a
rectangle of width 10, the pen would draw a rectangle of width 10.
Drawing a polygon defined by the corner points of the same
rectangle the stroke would have a width of 11.
The reason for this is best explained using the picture below:
\img q3painter_rationale.png
As we can see, stroking the rectangle so it gets a width of 10,
means the pen is drawn on a rectangle on width 9. The polygon,
however follows a consistent model.
In Qt 4, all rectangle based functions have changed to follow the
polygon approach, which means that the rectangle defines the size of
the fill, and the pen follows the edges of the shape. For pen widths
of 0 and 1 this means that the stroke will be inside the shape on the
left and the top and outside on the bottom and right.
The reason for the change in Qt 4 is so that we provide consistency
for all drawing functions even with complex transformations.
*/
/*!
\fn Q3Painter::Q3Painter()
Constructs a Q3Painter.
*/
/*!
\fn Q3Painter::Q3Painter(QPaintDevice *pdev)
Constructs a Q3Painter that operates on device \a pdev.
*/
/*!
\internal
*/
QRect Q3Painter::adjustedRectangle(const QRect &r)
{
QRect rect = r.normalized();
int subtract = d_func()->rectSubtraction();
if (subtract != 0)
rect.setSize(QSize(rect.width() - subtract, rect.height() - subtract));
return rect;
}
/*!
\fn void Q3Painter::drawRect(int x, int y, int w, int h)
\overload
Draws the rectangle that fits inside the bounds specified by \a x,
\a y, \a w and \a h using the current pen and brush.
*/
/*!
\fn void Q3Painter::drawRect(const QRect &r)
Draws a rectangle that fits inside the rectangle \a r using the
current pen and brush.
*/
/*!
\fn Q3Painter::drawEllipse(const QRect &r)
Draws the ellipse that fits inside the bounds \a r using the
current pen and brush.
*/
/*!
\fn Q3Painter::drawEllipse(int x, int y, int width, int height)
\overload
Draws an ellipse that fits inside the bounds specified by \a x,
\a y, \a width and \a height using the current pen and brush.
*/
/*!
\fn void Q3Painter::drawPie(int x, int y, int w, int h, int
startAngle, int spanAngle)
\overload
Draws a pie segment that fits inside the bounds (\a{x}, \a{y},
\a{w}, \a{h}) with the given \a startAngle and \a spanAngle.
*/
/*!
\fn void Q3Painter::drawPie(const QRect &r, int a, int alen)
Draws a pie defined by the rectangle \a r, the start angle \a a
and the arc length \a alen.
The pie is filled with the current brush().
The angles \a a and \a alen are 1/16th of a degree, i.e. a full
circle equals 5760 (16*360). Positive values of \a a and \a alen
mean counter-clockwise while negative values mean the clockwise
direction. Zero degrees is at the 3 o'clock position.
\sa drawArc(), drawChord()
*/
/*!
\fn void Q3Painter::drawArc(int x, int y, int w, int h, int
startAngle, int spanAngle)
\overload
Draws the arc that fits inside the rectangle (\a{x}, \a{y}, \a{w},
\a{h}), with the given \a startAngle and \a spanAngle.
*/
/*!
\fn void Q3Painter::drawArc(const QRect &r, int a, int alen)
Draws an arc defined by the rectangle \a r, the start angle \a a
and the arc length \a alen.
The angles \a a and \a alen are 1/16th of a degree, i.e. a full
circle equals 5760 (16*360). Positive values of \a a and \a alen
mean counter-clockwise while negative values mean the clockwise
direction. Zero degrees is at the 3 o'clock position.
Example:
\snippet doc/src/snippets/code/src_qt3support_painting_q3painter.cpp 0
\sa drawPie(), drawChord()
*/
/*!
\fn void Q3Painter::drawChord(int x, int y, int w, int h, int
startAngle, int spanAngle)
\overload
Draws a chord that fits inside the rectangle (\a{x}, \a{y}, \a{w},
\a{h}) with the given \a startAngle and \a spanAngle.
*/
/*!
\fn void Q3Painter::drawChord(const QRect &r, int a, int alen)
Draws a chord defined by the rectangle \a r, the start angle \a a
and the arc length \a alen.
The chord is filled with the current brush().
The angles \a a and \a alen are 1/16th of a degree, i.e. a full
circle equals 5760 (16*360). Positive values of \a a and \a alen
mean counter-clockwise while negative values mean the clockwise
direction. Zero degrees is at the 3 o'clock position.
\sa drawArc(), drawPie()
*/
/*!
\fn void Q3Painter::drawRoundRect(const QRect &r, int xrnd, int yrnd)
Draws a rounded rect that fits into the bounds \a r using the current
pen and brush. The parameters \a xrnd and \a yrnd specifies the roundness
in x and y direction.
*/
/*!
\fn void Q3Painter::drawRoundRect(int x, int y, int w, int h, int xrnd, int yrnd)
\overload
Draws a rounded rect that fits into the bounds \a x, \a y, \a w
and \a h using the current pen and brush. The parameters \a xrnd
and \a yrnd specifies the roundness in x and y direction.
*/
QT_END_NAMESPACE
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