| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the documentation of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
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| ** BSD License Usage |
| ** Alternatively, you may use this file under the terms of the BSD license |
| ** as follows: |
| ** |
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| ** modification, are permitted provided that the following conditions are |
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| ****************************************************************************/ |
| |
| //! [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] |