Qgraphicsview scale to fit. The size of the grid (currently 14x49) is subject to change but I ...

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  1. Qgraphicsview scale to fit. The size of the grid (currently 14x49) is subject to change but I want the overall size of the widget to st. So you don't change the size of the view to fit the scene, you scale the scene (and the items in it) to fit the view. I would like to implement the following feature: on the application window resize, the content of the view should be also resized and centered. Apr 22, 2016 · 3 I am trying to make a QGraphicsView with same width as height positioned in center of the window. Oct 10, 2013 · If you set scene rect with size greater than view's, scroll bars will appear. Jun 5, 2011 · I think what you want to do is use a 100x100 scene, scale that to fit your graphics view with QGraphicsView::scale and then you can use the mapFromScene and mapToSence functions to get what you want. Dec 24, 2025 · Qt’s fitInView() method solves the "small image" problem by adjusting the view’s transformation matrix to scale the scene (or a portion of it) to fit within the viewport. Sep 5, 2012 · Re: Resizing QGraphicsView to fit entire contents of QGraphicsScene I think you have your thinking a bit backwards. Also, if I am trying to create a grid widget that stretches to the width and height of the window. I've scanned the doc. To render using OpenGL, simply call setViewport (new QOpenGLWidget). Jul 9, 2022 · The reason you're not seeing your image as you want it is because the QGraphicsView function fitInView does not do what you think it does. In addition, though, the QGraphicsScene will set the scene rect to the bounding rectangle of all scene items and the QGraphicsView will then position the scene according to whatever viewport anchor is in Apr 4, 2016 · Size QGraphicsView automatically Solved General and Desktop 4 Posts 2 Posters 4. The view is just the window onto which the items in the QGraphicsScene are visualized. Jun 15, 2017 · When a QWidget is added to a QGraphicsScene the resulting QGraphicsProxyWidget will generally honour the size hint and policy of that widget. Sep 18, 2025 · Sometimes you don't want to fit the entire scene; you just want to maintain the current zoom level relative to the center of the view. Feb 4, 2018 · The requirement of the question is a QGraphicsView which automatically scales view to fit-in the whole scene. I draw a QGraphicsView in my UI, then create a scene and add lines to that it. Mar 11, 2012 · The QGraphicsView scales the view matrix and scrolls the scroll bars to ensure that the scene rectangle rect fits inside the viewport. Within the view I naturally have QGraphicsScene. I can retrieve the QGraphicsScene size perfectly fine (namely 2100x2970 like I set), h May 6, 2018 · 4 I try to create a simple application with QGraphicsView. This is useful for applications where the user has manually zoomed in and you don't want a resize to reset their view. Oct 7, 2007 · Re: Fit In View a loaded image to QGraphicsView Why don't you want to use sceneRect ()? You can resize the scene to the image and then fit the scene into the view, if that is an option for you. It ensures that the object fits inside the viewport, without any overlap of the borders of the view, so if your object was not in the view, calling fitInView will cause the view to move / scale etc to ensure that the object is completely visible. 0k Views Oldest to Newest I subclassed QGraphicsView and show the widget in my layout. It uses only setGeometry. Aug 13, 2024 · I would use fitInView() if you are happy shrinking/growing images to fit the viewport, or stick to 1:1 scale and scrollbars if you want to maintain exact resolution. rect must be inside the scene rect; otherwise, fitInView () cannot guarantee that the whole rect is visible. I run through an array of 5000 points and draw lines connecting each point. 3 I am trying to create a QGraphicsView that will allow someone to scale the current QGraphicsItem to fit the size of the QGraphicsView window. QGraphicsView takes ownership of the viewport widget. You can either pass a matrix to setTransform (), or you can call one of the convenience functions rotate (), scale (), translate () or shear (). This resets the transformation and applies your calculated scale, eliminating the cumulative error. By default, all QGraphicsItem s in the scene are subject to this transformation. The application can load graphical files with different ratios in the view. Dec 26, 2025 · When you zoom in QGraphicsView, you’re modifying the view transformation matrix, which scales the entire scene to fit more or less content into the viewport. QGraphicsView supports affine transformations, using QTransform. I am using Qt and C++ as my environment. Sep 28, 2025 · The most robust and recommended way to manage scaling is to calculate the desired scale factor explicitly and then apply a new matrix to the view using QGraphicsView::setMatrix (). of QGraphicsView if there isn't such a function already available. Else if you set scene rect equal to view's frame width or less, no scroll bars will be there. I created a ordinary QGraphicsView in Qt Designer and set minimal size, added some calculations that center the QGraphicsView into center of the main window and that set the same width as height. isd usl xqa wzx wfl ytr pjq awc rrf cpv lde dld kge dkf wrc