Why graphics scene occupy whole graphics view?

clostridium_difficile

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?

mrjj

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.

clostridium_difficile

This post is deleted!

clostridium_difficile

@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?

jsulm

@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