1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the documentation of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

    32 **

    33 **

    34 **

    35 **

    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 //! [0]

    43 QLinearGradient gradient(0, 0, 100, 100);

    44 gradient.setColorAt(0, Qt::red);

    45 gradient.setColorAt(0.5, Qt::green);

    46 gradient.setColorAt(1, Qt::blue);

    47 painter.setBrush(gradient);

    48 painter.drawRect(0, 0, 100, 100);

    49 //! [0]

    50 

    51 

    52 //! [1]

    53 QRadialGradient gradient(50, 50, 50, 30, 30);

    54 gradient.setColorAt(0.2, Qt::white);

    55 gradient.setColorAt(0.8, Qt::green);

    56 gradient.setColorAt(1, Qt::black);

    57 painter.setBrush(gradient);

    58 painter.drawEllipse(0, 0, 100, 100);

    59 //! [1]

    60 

    61 

    62 //! [2]

    63 QConicalGradient gradient(60, 40, 0);

    64 gradient.setColorAt(0, Qt::black);

    65 gradient.setColorAt(0.4, Qt::green);

    66 gradient.setColorAt(0.6, Qt::white);

    67 gradient.setColorAt(1, Qt::black);

    68 painter.setBrush(gradient);

    69 painter.drawEllipse(0, 0, 100, 100);

    70 //! [2]

    71 

    72 

    73 //! [3]

    74 // Specfiy semi-transparent red

    75 painter.setBrush(QColor(255, 0, 0, 127));

    76 painter.drawRect(0, 0, width()/2, height());

    77 

    78 // Specify semi-transparend blue

    79 painter.setBrush(QColor(0, 0, 255, 127));

    80 painter.drawRect(0, 0, width(), height()/2);

    81 //! [3]

    82 

    83 

    84 //! [4]

    85 // One line without anti-aliasing

    86 painter.drawLine(0, 0, width()/2, height());

    87 

    88 // One line with anti-aliasing

    89 painter.setRenderHint(QPainter::Antialiasing);

    90 painter.drawLine(width()/2, 0, width()/2, height());

    91 //! [4]

    92 

    93 

    94 //! [5]

    95 QPainterPath path;

    96 path.addRect(20, 20, 60, 60);

    97 path.addBezier(0, 0,  99, 0,  50, 50,  99, 99);

    98 path.addBezier(99, 99,  0, 99,  50, 50,  0, 0);

    99 painter.drawPath(path);

   100 //! [5]

   101 

   102 

   103 //! [6]

   104 QPixmap buffer(size());

   105 QPainter painter(&buffer);

   106 

   107 // Paint code here

   108 

   109 painter.end();

   110 bitBlt(this, 0, 0, &buffer);

   111 //! [6]

   112 

   113 

   114 //! [7]

   115 QPainter painter(this);

   116 

   117 // Paint code here

   118 

   119 painter.end();

   120 //! [7]

   121 

   122 

   123 //! [8]

   124 unbufferedWidget->setAttribute(Qt::WA_PaintOnScreen);

   125 //! [8]

   126 

   127 

   128 //! [9]

   129 QLinearGradient gradient(0, 0, 100, 100);

   130 gradient.setColorAt(0, Qt::blue);

   131 gradient.setColorAt(1, Qt::red);

   132 painter.setPen(QPen(gradient, 0));

   133 for (int y=fontSize; y<100; y+=fontSize)

   134     drawText(0, y, text);

   135 //! [9]

   136 

   137 

   138 //! [10]

   139 QImage image(100, 100, 32);

   140 QPainter painter(&image);

   141 

   142 // painter commands.

   143 

   144 painter.end();

   145 //! [10]