<![CDATA[Why graphics scene occupy whole graphics view?]]>Why graphics scene is beeing drawed in whole graphics view area? I invoked setSceneRect and scene does not have correct size as it supposed to have.

graphicsScene = std::make_shared<GraphicsScene>(new GraphicsScene(this));
graphicsScene->setSceneRect(0, 0, 250, 250);
graphicsScene->setBackgroundBrush(QColor(123,123,123));
ui->canvas->setScene(graphicsScene.get());

Whole view area is gray (color(123,123,123)) regardless what view's size is. Even graphics items are beeing drawed outside scene rect. How to correcty set scene size?

]]>https://forum.qt.io/topic/109899/why-graphics-scene-occupy-whole-graphics-viewRSS for NodeTue, 21 Apr 2026 19:27:46 GMTWed, 18 Dec 2019 22:06:19 GMT60<![CDATA[Reply to Why graphics scene occupy whole graphics view? on Thu, 19 Dec 2019 06:27:49 GMT]]>@clostridium_difficile said in Why graphics scene occupy whole graphics view?:

how to make scene to get events when mouse pointer is over scene's rendering rectangle?

Override https://doc.qt.io/qt-5/qgraphicsscene.html#mouseMoveEvent

]]>https://forum.qt.io/post/568158https://forum.qt.io/post/568158Thu, 19 Dec 2019 06:27:49 GMT<![CDATA[Reply to Why graphics scene occupy whole graphics view? on Wed, 18 Dec 2019 23:18:44 GMT]]>@mrjj said in Why graphics scene occupy whole graphics view?:

Hi
As that is how it works. The setSceneRect defines the logical extent of the scene and
used by the View to know if to show scrollbars etc.
Its not a setting for the ClientArea it will occupy. It will always fill the View completely.

Well, how to make graphics view render only selected region of scene? Also, I have other questions: how to make scene to get events when mouse pointer is over scene's rendering rectangle?

]]>https://forum.qt.io/post/568140https://forum.qt.io/post/568140Wed, 18 Dec 2019 23:18:44 GMT<![CDATA[Reply to Why graphics scene occupy whole graphics view? on Wed, 18 Dec 2019 22:15:57 GMT]]>Hi
As that is how it works. The setSceneRect defines the logical extent of the scene and
used by the View to know if to show scrollbars etc.
Its not a setting for the ClientArea it will occupy. It will always fill the View completely.

]]>https://forum.qt.io/post/568137https://forum.qt.io/post/568137Wed, 18 Dec 2019 22:15:57 GMT