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authorCasper van Donderen <casper.vandonderen@nokia.com>2012-05-07 18:49:48 +0200
committerMarius Storm-Olsen <marius.storm-olsen@nokia.com>2012-05-09 08:36:46 +0200
commit97b5b8009254004608feefb903cbf44abaa099f6 (patch)
treecf3a79caa34085de1308eb86cac6ea0d9663aa9c /src/widgets/doc/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp
parentcfdc5628b1fc2cbafa2aebca38995e5718fcb0de (diff)
Doc: Modularize QtWidgets documentation.
This change moves the snippets and images to the modularized directories. Change-Id: Idec1afb9db7ea6add1ca4cf25ec4019d8bce0c4d Reviewed-by: Marius Storm-Olsen <marius.storm-olsen@nokia.com>
Diffstat (limited to 'src/widgets/doc/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp')
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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above copyright
+** notice, this list of conditions and the following disclaimer in
+** the documentation and/or other materials provided with the
+** distribution.
+** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+** the names of its contributors may be used to endorse or promote
+** products derived from this software without specific prior written
+** permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+QGraphicsScene scene;
+scene.addText("Hello, world!");
+
+QGraphicsView view(&scene);
+view.show();
+//! [0]
+
+
+//! [1]
+QGraphicsScene scene;
+scene.addItem(...
+...
+QPrinter printer(QPrinter::HighResolution);
+printer.setPaperSize(QPrinter::A4);
+
+QPainter painter(&printer);
+scene.render(&painter);
+//! [1]
+
+
+//! [2]
+QSizeF segmentSize = sceneRect().size() / pow(2, depth - 1);
+//! [2]
+
+
+//! [3]
+QGraphicsScene scene;
+QGraphicsView view(&scene);
+view.show();
+
+// a blue background
+scene.setBackgroundBrush(Qt::blue);
+
+// a gradient background
+QRadialGradient gradient(0, 0, 10);
+gradient.setSpread(QGradient::RepeatSpread);
+scene.setBackgroundBrush(gradient);
+//! [3]
+
+
+//! [4]
+QGraphicsScene scene;
+QGraphicsView view(&scene);
+view.show();
+
+// a white semi-transparent foreground
+scene.setForegroundBrush(QColor(255, 255, 255, 127));
+
+// a grid foreground
+scene.setForegroundBrush(QBrush(Qt::lightGray, Qt::CrossPattern));
+//! [4]
+
+
+//! [5]
+QRectF TileScene::rectForTile(int x, int y) const
+{
+ // Return the rectangle for the tile at position (x, y).
+ return QRectF(x * tileWidth, y * tileHeight, tileWidth, tileHeight);
+}
+
+void TileScene::setTile(int x, int y, const QPixmap &pixmap)
+{
+ // Sets or replaces the tile at position (x, y) with pixmap.
+ if (x >= 0 && x < numTilesH && y >= 0 && y < numTilesV) {
+ tiles[y][x] = pixmap;
+ invalidate(rectForTile(x, y), BackgroundLayer);
+ }
+}
+
+void TileScene::drawBackground(QPainter *painter, const QRectF &exposed)
+{
+ // Draws all tiles that intersect the exposed area.
+ for (int y = 0; y < numTilesV; ++y) {
+ for (int x = 0; x < numTilesH; ++x) {
+ QRectF rect = rectForTile(x, y);
+ if (exposed.intersects(rect))
+ painter->drawPixmap(rect.topLeft(), tiles[y][x]);
+ }
+ }
+}
+//! [5]