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Diffstat (limited to 'sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp')
-rw-r--r-- | sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp b/sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp new file mode 100644 index 000000000..0538cbaef --- /dev/null +++ b/sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_gui_graphicsview_qgraphicsscene.cpp @@ -0,0 +1,125 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the documentation of PySide2. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, 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 The Qt Company Ltd 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] +scene = QGraphicsScene() +scene.addText("Hello, world!") + +view = QGraphicsView(&scene) +view.show() +//! [0] + + +//! [1] +scene = QGraphicsScene +scene.addItem(... +... +printer = QPrinter(QPrinter.HighResolution) +printer.setPaperSize(QPrinter.A4) + +painter = QPainter(printer) +scene.render(&painter) +//! [1] + + +//! [2] +segmentSize = sceneRect().size() / math.pow(2, depth - 1) +//! [2] + + +//! [3] +scene = QGraphicsScene() +view = QGraphicsView(scene) +view.show() + +# a blue background +scene.setBackgroundBrush(Qt.blue) + +# a gradient background +gradient = QRadialGradient(0, 0, 10) +gradient.setSpread(QGradient.RepeatSpread) +scene.setBackgroundBrush(gradient) +//! [3] + + +//! [4] +scene = QGraphicsScene() +view = QGraphicsView(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] +class TileScene (QGraphicsScene): + # ... + def rectForTile(x, y): + # Return the rectangle for the tile at position (x, y). + return QRectF(x * self.tileWidth, y * self.tileHeight, self.tileWidth, self.tileHeight) + + def setTile(x, y, pixmap): + # Sets or replaces the tile at position (x, y) with pixmap. + if x >= 0 && x < self.numTilesH && y >= 0 && y < self.numTilesV: + self.tiles[y][x] = pixmap + invalidate(rectForTile(x, y), BackgroundLayer) + + def drawBackground(painter, exposed): + # Draws all tiles that intersect the exposed area. + for y in range(0, self.numTilesV: + for x in range(0, self.numTilesH: + rect = rectForTile(x, y) + if exposed.intersects(rect): + painter.drawPixmap(rect.topLeft(), tiles[y][x]) +//! [5] |