diff options
Diffstat (limited to 'doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp')
-rw-r--r-- | doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp b/doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp new file mode 100644 index 0000000..d22b872 --- /dev/null +++ b/doc/src/snippets/code/src_gui_graphicsview_qgraphicsview.cpp @@ -0,0 +1,92 @@ +//! [0] +QGraphicsScene scene; +scene.addText("Hello, world!"); + +QGraphicsView view(&scene); +view.show(); +//! [0] + + +//! [1] +QGraphicsScene scene; +scene.addRect(QRectF(-10, -10, 20, 20)); + +QGraphicsView view(&scene); +view.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform); +view.show(); +//! [1] + + +//! [2] +QGraphicsView view; +view.setBackgroundBrush(QImage(":/images/backgroundtile.png")); +view.setCacheMode(QGraphicsView::CacheBackground); +//! [2] + + +//! [3] +QGraphicsScene scene; +scene.addText("GraphicsView rotated clockwise"); + +QGraphicsView view(&scene); +view.rotate(90); // the text is rendered with a 90 degree clockwise rotation +view.show(); +//! [3] + + +//! [4] +QGraphicsScene scene; +scene.addItem(... +... + +QGraphicsView view(&scene); +view.show(); +... + +QPrinter printer(QPrinter::HighResolution); +printer.setPageSize(QPrinter::A4); +QPainter painter(&printer); + +// print, fitting the viewport contents into a full page +view.render(&painter); + +// print the upper half of the viewport into the lower. +// half of the page. +QRect viewport = view.viewport()->rect(); +view.render(&painter, + QRectF(0, printer.height() / 2, + printer.width(), printer.height() / 2), + viewport.adjusted(0, 0, 0, -viewport.height() / 2)); + +//! [4] + + +//! [5] +void CustomView::mousePressEvent(QMouseEvent *event) +{ + qDebug() << "There are" << items(event->pos()).size() + << "items at position" << mapToScene(event->pos()); +} +//! [5] + + +//! [6] +void CustomView::mousePressEvent(QMouseEvent *event) +{ + if (QGraphicsItem *item = itemAt(event->pos())) { + qDebug() << "You clicked on item" << item; + } else { + qDebug() << "You didn't click on an item."; + } +} +//! [6] + + +//! [7] +QGraphicsScene scene; +scene.addText("GraphicsView rotated clockwise"); + +QGraphicsView view(&scene); +view.rotate(90); // the text is rendered with a 90 degree clockwise rotation +view.show(); +//! [7] |