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Graphicsview boundingrect

WebOct 9, 2024 · If the first is selected, then by clicking on the Graphicsscene a GraphicsItem will be added to the scene. I would like to have a button, which would change the color of these points by pressing it. The color doesn't matter. It could be red for example. How could I do that? Thank you! Webvirtual ~MyQGraphicsObject (); virtual QRectF boundingRect () const; virtual QPainterPath shape () const; virtual void paint (QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget); virtual bool sceneEvent (QEvent *event); private: QBrush brush_; }; MyQGraphicsObject::MyQGraphicsObject (QGraphicsItem* parent)

图形视图框架QGraphicsItem（项，概念） - 代码天地

WebFirst of all, QGraphicsItem::boundingRect() returns a copy of the rect. Changing it has no effect on the actual item. To change an item's geometry, you need to override that function and return a different rect. And call prepareGeometryChange() when you actually change it.. Now, if all you want is to fit the item in QGraphicsView's viewport, use … WebOct 20, 2014 · The problem is that my custom arrows (they inherit QGraphicsPathItem) disappear from the scene whenever it's boundingRect () center is scrolled off the view. Everytime the scene expands, both it's sceneRect () and the view's sceneRect () are updated as well. I've: set ui->graphicsView->setViewportUpdateMode … lookout credit union burley idaho https://proteuscorporation.com

MousePressEvent, position offset in QGraphicsView

WebJan 29, 2015 · 1 Answer. Reimplement mousePressEvent on the scene, rather than the view. That way, the event argument will be a QGraphicsSceneMouseEvent, which has several useful additional functions - including scenePos, which does exactly what you want: class graphicsScene (QtGui.QGraphicsScene): def __init__ (self, parent=None): super … WebAug 24, 2015 · To obtain the correct result using transformations: QGraphicsItem * item = ....; QGraphicsRotation rot; QGraphicsScale scale; auto center = item->boundingRect ().center (); rot.setOrigin (QVector3D (center)); scale.setOrigin (QVector3D (center ())); item->setTransformations (QList () << &rot << &scale); Finally, the … WebObjectives • UsingQGraphicsView-relatedclasses • CoordinateSchemes,Transformations • Extendingitems • Eventhandling • Painting • Boundaries 3/41 GraphicsView lookout credit

c++ - Qt: Custom QGraphicsItem not showing when boundingRect…

Category:GraphicsView: Artifacts after reducing boundingRect size

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Graphicsview boundingrect

How to get visible scene rectangle of QGraphicsView?

WebApr 9, 2024 · Windows10下Git环境变量配置. 一.确定Git正确安装并能使用 右键项目目录,检查Git版本: 输入: git --version 二. 配置环境变量 右键我的电脑 --&gt; 属性 点击高级系统设置 --&gt; 环境变量 --&gt; 选择用户变量或系统变量中的Path,点击编辑 找到Git安装目录,添加以下地址: Git为安装根 ... WebNov 13, 2011 · sceneRect = graphicsView.mapToScene (graphicsView.rect ()).boundingRect () In case there is a shear or rotation transformation present it gives you the bounding rectangle of the visible scene area. If you do not have such transformations (only shift or zoom) the returned rectangle is the exact scene area.

Graphicsview boundingrect

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WebIn this case. view-&gt;mapToScene ( view-&gt;viewport ()-&gt;geometry () ) returns a QPolygonF (NOT a QRectF) which is the visible rectangle in scene coordinates. By the way, … WebOct 11, 2024 · Since the movement of the item is caused by mouse events, you're preventing it from moving by not calling the default implementation. Add super () calls to each mouse event handlers ( super ().mouseMoveEvent (event) etc). Also, boundingRect () should return a QRectF type, not QRect. – musicamante Oct 10, 2024 at 17:42 You were …

WebApr 22, 2014 · 1. You have to explicitly set the sceneRect of the QGraphicsScene. Otherwise, it will grow automatically. You will want it to be fixed size. Then, you need to subclass QGraphicsTextItem, or create your own QGraphicsItem from scratch. Maybe if you override virtual QRectF boundingRect () const, you could call the base boundingRect, … WebSep 15, 2012 · Ok, calling QGraphicsView::viewport().update() after QGraphicsScene::clear() solved my problems.. But does anyone have an explanaition to the behavior described above? EDIT: Upon doing doing something else I stumbled upon the actual core of the problem: I messed up the boundingRect() of my GraphicItems, so it …

Webdetection mechanisms use boundingRect() to provide an efficient: 99: cut-off. The fine grained collision algorithm in: 100: collidesWithItem() is based on calling shape(), which returns an: 101: accurate outline of the item's shape as a QPainterPath. 102: 103: QGraphicsScene expects all items boundingRect() and shape() to: 104: remain … WebAug 6, 2024 · To define a QGraphicsScene you define it's boundaries or sceneRect which defines the x &amp; y origins and dimensions of the scene. If you don't provide a sceneRect it will default to the minimum bounding …

WebSep 20, 2024 · My solution will fit the height of the smallest rectangle that encapsulates all the items (sceneRect) to the viewport of the QGraphicsView. So set the height of the items a value not so small so that the image quality is not lost. I …

Web在我修改过的示例中，这种情况没有发生，我也不知道为什么？您使用QtGui.QGraphicsItem，因此您定义了boundingRect和paint方法，其中使用了painter-drawerlipse方法。在您发现的第一. 我在SO中找到了@serge_gubenko的例子。 然后我做了一些修改，最终得到： hopton rehabWeb在图形界面框架中的事件都是先由视图进行接收，然后传递给场景，再由场景传递给图形项。. 通过键盘处理的话，需要设置焦点，在QGraphicsScene中使用setFoucesItem（）函数可以设置焦点，或者图形项使用setFouce（）获取焦点。. 默认的如果场景中没有获取焦点 ... lookout cottage rentalsWebDec 11, 2024 · If you want to display the items according to their position while also ensuring that negative coordinates are correctly "outside" the center, you must decide the size of the visible sceneRect and set it accordingly: boundingRect = scene.itemsBoundingRect () scene.setSceneRect (0, 0, boundingRect.right (), boundingRect.bottom ()) Share hopton railway stationWebIt sets the scene rectangle; the bounding rectangle of the scene. The scene rectangle defines the extent of the scene. It is primarily used by QGraphicsView to determine the view's default scrollable area, and by … hopton reviewsWebgraphicsView->mapToScene(graphicsView->viewport()->geometry()).boundingRect() Bye, Marcel. Share. Improve this answer. ... By the way, QPolygonF has a member function boundingRect() which does not return the properly visible rectangle of the view, but might be useful anyways. Share. Improve this answer. Follow edited Nov 3, 2024 at 20:56. lookout creek farmsWebFeb 8, 2024 · I have checked that the boundingRect has the correct size, by replacing the paint code with (basically) painter->drawRect(boundingRect()); The size is exactly as expected, before and after scaling the x-axis. ... Also, all my pens are hairline (1 px cosmetic), and GraphicsView normally takes that one pixel around the boundingRect … lookout credit union idaho falls cd ratesWebC++ (Cpp) QGraphicsTextItem::boundingRect - 30 examples found. These are the top rated real world C++ (Cpp) examples of QGraphicsTextItem::boundingRect extracted from open source projects. You can rate examples to help us improve the quality of examples. Programming Language: C++ (Cpp) Class/Type: QGraphicsTextItem Method/Function: … lookout credit union log in