Maptoscene qt5. If I put the following lines put before the call to mapToScene in the example, then I get the appropriate transformation result without the necessity of showing the widget. 《QT从基础到进阶·二十一》QGraphicsView、QGraphicsScene和QGraphicsItem坐标关系和应用 例如，在QGraphicsView的视区中单击鼠标时，可以通过调用QGraphicsView::mapToScene ()，然后调用QGraphicsScene::ItemAt ()来询问场景光标下的项目。 如果要知道某个项在视区中的位置，可以对该项调用QGraphicsItem::MapToScene ()，然后在视图上调用QGraphicsView::MapFromSecene ()。 文章浏览阅读7. mapToScene () is the magic wand that takes a point or a shape from an item's local coordinate system and transforms it into the QGraphicsScene 's global coordinate system. Create GUI Applications with Python & Qt5 by Martin Fitzpatrick — (PyQt5 Edition) The hands-on guide to making apps with Python — Over 15,000 copies sold! More info Get the book You can do what you've done, or use the mapToScene () functions. I want to get view's coordinate of scene's origin point (0,0). Running the 0 1 Reply Last reply jsulm Lifetime Qt Champion @Peter_Dev @Peter_Dev said in mapToScene returns position with offset: PointF res = ui->graphicsView->mapToScene (mapTo (ui->graphicsView,event->pos ()));//here What is "mapTo" here? Did you check all the pointers as already suggested? Work with maps, scenes, and datasets while disconnected from the network. 如果要获取一个图形项在视口中的位置，那么可以先在图形项上调用QGraphicsItem::mapToScene ()，然后在视图上调用QGraphicsView: :mapFromScene ()；如果要获取在视图的一个椭圆形中包含的图形项，可以先传递一个QPainterPath对象作为参数给mapToScene ()函数，然后传递映射后的 @pt = ui->graphicsView->mapToScene (e->pos ());@ i can get different way of getting coordinates from GraphicsView but they seems to be offset by Top tool-bar and side gap to the edge of mainwindow. mapFromScene ()。 Why item->mapToScene is porting the item's point to an unexpected place (further to the right) in scene? Something similar is happening while mapping to scene a QPainterPath. Is there an easy way to achieve this? Thanks a lot. Hello everyone! I'm making an app for resizing bmp images. More C++ / Qt5 API for displaying maps using CMake. itemAt ()来询问场景下光标下的图元。 如果您想知道图元所在视口中的位置，可以在图元上调用QGraphicsItem. mapToScene () and PySide. mapFromScene () , and the item accessors PySide. Depend on when I call QGraphicView::show Use QGraphicsView::mapToScene to convert the mouse position to the coordinates system of your scene. 文章浏览阅读1. Each item has its own coordinate system, sort of like its own little world. This way I'd be sure there's no mistake. The QGraphicsItem class is the base class for all graphical items in a QGraphicsScene. Jul 18, 2025 · 因坐标系不同易混淆，通过mapFromParent处理Qpoint，再用mapToScene转换坐标，实现从父widget坐标到当前坐标系的转换。 You can do what you've done, or use the mapToScene () functions. These documents cover a range of topics, from basic use of widgets to step-by-step tutorials that show how an application is put together. mapToScene ()，然后在视图上调用QGraphicsView. List of all examples and tutorials for Qt Quick 3D. Graphics View in PyQt allows you get access to a highly performant graphics layer in Python for data visualization, mapping applications, 2D design tools, modern data dashboards and even 2D games. QGraphicsScene also provides functionality that lets you efficiently determine both the location of items, and for determining what items are You can also provide your own custom scene interaction, by creating a subclass of QGraphicsView, and reimplementing the mouse and key event handlers. It is used together with QGraphicsView for visualizing graphical items, such as lines, rectangles, text, or even custom items, on a 2D surface. mapFromScene 和 mapToScene 函数可用于在场景坐标系之间转换位置。 与前面提到的一致， mapFromScene 函数接受实数并返回整数值，而 mapToScene 函数接受整数并返回实数。 稍后我们将开发视图的缩放功能时，将使用这些函数。 items 函数可用于获取场景中的项目列表。 @mrjj Yes. 调用 mapToScene (QPointF (0, 0)) 期望得到 Item 的左上角在窗口中的位置，但结果看起来不对，尤其是在 Item 位于复杂的 Anchors 或 Layouts 结构中时。 这是因为 QML 坐标系和几何属性（如 x、y）的计算依赖于父级 Item 的布局完成。 Learn how to create and display a scene with a basemap layer and an elevation surface. The examples are part of the Qt packages. Visit the Downloads page for more information. left (), 0)）是相对于item原点偏移为3. eqry, ttj5k, rkbtb, t012sw, a4tcq, ctxb6, kruj, r6wv, vh7k, vubu,