1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the documentation of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:BSD$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** BSD License Usage 18 ** Alternatively, you may use this file under the terms of the BSD license 19 ** as follows: 20 ** 21 ** "Redistribution and use in source and binary forms, with or without 22 ** modification, are permitted provided that the following conditions are 23 ** met: 24 ** * Redistributions of source code must retain the above copyright 25 ** notice, this list of conditions and the following disclaimer. 26 ** * Redistributions in binary form must reproduce the above copyright 27 ** notice, this list of conditions and the following disclaimer in 28 ** the documentation and/or other materials provided with the 29 ** distribution. 30 ** * Neither the name of The Qt Company Ltd nor the names of its 31 ** contributors may be used to endorse or promote products derived 32 ** from this software without specific prior written permission. 33 ** 34 ** 35 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 36 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 37 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 38 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 39 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 40 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 41 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 42 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 43 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 44 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 45 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." 46 ** 47 ** $QT_END_LICENSE$ 48 ** 49 ****************************************************************************/ 50 51 //! [0] 52 QGraphicsScene scene; 53 scene.addText("Hello, world!"); 54 55 QGraphicsView view(&scene); 56 view.show(); 57 //! [0] 58 59 60 //! [1] 61 QGraphicsScene scene; 62 scene.addRect(QRectF(-10, -10, 20, 20)); 63 64 QGraphicsView view(&scene); 65 view.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform); 66 view.show(); 67 //! [1] 68 69 70 //! [2] 71 QGraphicsView view; 72 view.setBackgroundBrush(QImage(":/images/backgroundtile.png")); 73 view.setCacheMode(QGraphicsView::CacheBackground); 74 //! [2] 75 76 77 //! [3] 78 QGraphicsScene scene; 79 scene.addText("GraphicsView rotated clockwise"); 80 81 QGraphicsView view(&scene); 82 view.rotate(90); // the text is rendered with a 90 degree clockwise rotation 83 view.show(); 84 //! [3] 85 86 87 //! [4] 88 QGraphicsScene scene; 89 scene.addItem(... 90 ... 91 92 QGraphicsView view(&scene); 93 view.show(); 94 ... 95 96 QPrinter printer(QPrinter::HighResolution); 97 printer.setPageSize(QPrinter::A4); 98 QPainter painter(&printer); 99 100 // print, fitting the viewport contents into a full page 101 view.render(&painter); 102 103 // print the upper half of the viewport into the lower. 104 // half of the page. 105 QRect viewport = view.viewport()->rect(); 106 view.render(&painter, 107 QRectF(0, printer.height() / 2, 108 printer.width(), printer.height() / 2), 109 viewport.adjusted(0, 0, 0, -viewport.height() / 2)); 110 111 //! [4] 112 113 114 //! [5] 115 void CustomView::mousePressEvent(QMouseEvent *event) 116 { 117 qDebug() << "There are" << items(event->pos()).size() 118 << "items at position" << mapToScene(event->pos()); 119 } 120 //! [5] 121 122 123 //! [6] 124 void CustomView::mousePressEvent(QMouseEvent *event) 125 { 126 if (QGraphicsItem *item = itemAt(event->pos())) { 127 qDebug() << "You clicked on item" << item; 128 } else { 129 qDebug("You didn't click on an item."); 130 } 131 } 132 //! [6] 133 134 135 //! [7] 136 QGraphicsScene scene; 137 scene.addText("GraphicsView rotated clockwise"); 138 139 QGraphicsView view(&scene); 140 view.rotate(90); // the text is rendered with a 90 degree clockwise rotation 141 view.show(); 142 //! [7] 143