Qt viewport coordinates. boundingRect ().

Qt viewport coordinates. Negative Can you post a specific example and some values? Might be easier to see then. Qt's coordinate system has the positive direction down and to the right rather than up and to the right, which is what you're wanting. 0" encoding="UTF-8" standalone="no"?> The mapping of the logical coordinates to the physical coordinates are handled by QPainter ‘s world transformation worldTransform() (described in the Transformations section), and Multiplies this matrix by another that performs the scale and bias transformation used by OpenGL to transform from normalized device coordinates (NDC) to viewport (window) coordinates. So when we scroll to the bottom right corner I get something like 50,50,600,800 The basic idea Now, how do I connect the size of the window, that is the size of the QGraphicsView with the local coordinates of it. I then Returns the content's origin in viewport coordinates. Reality The coordinates returned by visualItemRect () are relative to the The mapping of the logical coordinates to the physical coordinates are handled by QPainter 's world transformation worldMatrix () (described in the Transformations section), and QPainter 's Hi. In simpler terms. I’m attempting to get a better handle on the Qt coordinate system by creating a scene that is 600 by 600 with the top left corner having an x value of -300 and a y value of Now, how do I connect the size of the window, that is the size of the QGraphicsView with the local coordinates of it. Graphics View provides an item-based The coordinates entered by the user must be logical coordinates, and the final drawing must be the viewport coordinates after the window-viewport conversion, that is, the device coordinates Ideally what I want to achieve is to have coordinates for two rectangles. Since 4. Hi, What's the simplest way to add a QGraphicsItem to a QGraphicsScene so that it's always visible at a fixed, absolute position These functions allow you to map points, rectangles, polygons and paths between view coordinates and scene coordinates, and to find items on the scene using view coordinates. I get the coordinates on mouseMoveEvent and even I can make a The mapping of the logical coordinates to the physical coordinates are handled by QPainter ‘s world transformation worldTransform() (described in the Transformations section), and The coordinates of the widget representing the viewport can be mapped to the coordinates in the content space by adding (or substracting, based on the mapping direction) These functions allow you to map points, rectangles, polygons and paths between view coordinates and scene coordinates, and to find items on the scene using view coordinates. I mean, when I write setOffset (x, y), how am I I want to render a scene on a QWidget, and I need to define a transofrmation from world coordinates to screen coordinates. Negative Convert from document coordinates to viewport coordinates based on whatever margin or such you are using. Negative Using QGraphicsView::mapFromScene, you can map it to view coordinates. Negative Ideally what I want to achieve is to have coordinates for two rectangles. 在 Qt 中， setViewport 和 setWindow 是用于控制 坐标系 映射的核心方法，二者共同决定了绘图逻辑与物理设备之间的转换关系。以下是关键点总结： ‌ 1. QGraphicsScene::itemsBoundingRect () will return a rectangle over all items in the scene, in scene coordinates. Each unit in view coordinates corresponds to one pixel. These functions allow you to map points, rectangles, polygons and paths between view coordinates and scene coordinates, and to find items on the scene using view coordinates. Ensure your layouts are working as expected. The "window" describes the same rectangle in logical coordinates. By setting the "window" or viewport rectangle, you perform a linear transformation of the coordinates. It's a problem because I intend to Using QGraphicsView::mapFromScene, you can map it to view coordinates. Anyway, I really can't figure out why the graphicsview always returns QSize (98,28) as it's size, geometry and viewport size upon construction. The origin of the content of a plain text edit is always the top left corner of the first visible text block. So keep track of the last scrollbar position when you zoom, then when you add an item after I am using PySide6 and wondering how I can get a QRect or a QPoint of the QTextCursor's position in a QTextDocument. Negative Returns the content's origin in viewport coordinates. In order to find the center of the view in scene coordinates, I had to do it in the following order: mapToScene (viewport ()->rect ()). Using QGraphicsView::mapFromScene, you can map it to view coordinates. One of them is the rectangle that defines the QGraphicsView 's viewport and the other one is a QGraphicsScene::itemsBoundingRect() will always return the same values, unless you change something in the scene itself. Welcome to Qt Centre. Despite reading the information on coordinate systems in the QGraphicsView reference, I am unable to I finally got this working by obtaining the QMatrix from the painter, inverting it and then using the map () method to convert the device coordinates to my user coordinates. View Coordinates View coordinates are the coordinates of the widget. This means the coordinates are relative to the top-left corner of the When rendering, Graphics View’s scene coordinates correspond to QPainter’s logical coordinates, and view coordinates are the same as These functions allow you to map points, rectangles, polygons and paths between view coordinates and scene coordinates, and to find items on the scene using view coordinates. By default the logical and physical The Graphics View Architecture. The mapping of the logical coordinates to the physical coordinates are handled by QPainter 's world transformation worldTransform () (described in the Transformations section), and Misconception Believing the returned QRect coordinates are global screen coordinates. One of them is the rectangle that defines the QGraphicsView 's viewport and the other one is a I'm looking for a way to find the viewport coordinates relative to the Widget inside. I imagine others will need to do this in I want to draw polygons in a QGraphicsScene but where the polygons has latitude/longitude positions. Negative The helper functions below calculate the screen coordinates of the specified items of QGraphicsViews, which may be required for use with mousePress () , mouseRelease () and [SOLVED]Get scene coordinates relative to viewport. The mapping of the logical coordinates to the physical coordinates are handled by QPainter 's world transformation worldTransform () (described in the Transformations section), and The mapping of the logical coordinates to the physical coordinates are handled by QPainter 's world transformation worldTransform () (described in the Transformations section), and Using QGraphicsView::mapFromScene, you can map it to view coordinates. Using QGraphicsView::mapFromScene, you can map it to view Convert from document coordinates to viewport coordinates based on whatever margin or such you are using. But QGraphicsView::mapFromScene should take The mapping of the logical coordinates to the physical coordinates are handled by QPainter ‘s world transformation worldTransform() (described in the Transformations section), and The coordinates of the widget representing the viewport can be mapped to the coordinates in the content space by adding (or substracting, based on the mapping direction) [SOLVED]Get scene coordinates relative to viewport. Using QGraphicsView::mapFromScene, you can map it to view The mapping of the logical coordinates to the physical coordinates are handled by QPainter ‘s world transformation worldTransform() (described Re: QTextEdit::cursorForPosition () and character at mouse pointer? Documentation on QTextEdit::cursorForPosition says it accepts coordinates relative to Yes, I see that viewport->mapToGlobal(pos); returns the same screen coordinates no matter if I scroll or not. All mouse events and drag and drop events are Consider Transformations If the scene is transformed, you might need to adjust the coordinates or item position accordingly before calling centerOn (). Now you can compare that result to the width and height of your actual viewport. center () mapToScene Using QGraphicsView::mapFromScene, you can map it to view coordinates. Negative QScrollArea relative viewport coordinates By kalanikta in forum Qt Programming Replies: 1 Last Post: 21st April 2006, 10:30 To start viewing messages, select the forum that you want to visit from the selection below. General and Desktop qgraphicsscene qgraphicsview mapto 4 The QGraphicsView class provides a widget for displaying the contents of a QGraphicsScene. So when we scroll to the bottom right corner I get something like 50,50,600,800 The basic idea How to map Viewport coordinates to content coordinates in QTableView By kalos80 in forum Qt Programming Replies: 4 Last Post: 18th March 2010, 10:11 These functions allow you to map points, rectangles, polygons and paths between view coordinates and scene coordinates, and to find items on the scene using view coordinates. Negative coordinates are How to map Viewport coordinates to content coordinates in QTableView By kalos80 in forum Qt Programming Replies: 4 Last Post: 18th March 2010, 10:11 How to map Viewport coordinates to content coordinates in QTableView By kalos80 in forum Qt Programming Replies: 4 Last Post: 18th March 2010, 10:11 These functions allow you to map points, rectangles, polygons and paths between view coordinates and scene coordinates, and to find items on the scene using view coordinates. QPainter::setWindow seems to be the correct . 视口（Viewport）与窗口（Window） These functions allow you to map points, rectangles, polygons and paths between view coordinates and scene coordinates, and to find items on the scene using view coordinates. Use Qt Designer to preview layouts or print widget geometry () / pos () to debug. I mean, when I write setOffset (x, y), how am I I'm looking for a way to find the viewport coordinates relative to the Widget inside. The way to set the center is very easy using the centerOn() me Hello, How can I display the mouse coordinate position (XY) on my derived QGraphicsView class. 2 QGraphicsView visualizes the contents of a 每次 Qt 绘图，碰到所谓的逻辑坐标系（logic coordinate)，世界坐标系（world coordinate），设备坐标系（device coordinate/ physice Using QGraphicsView::mapFromScene, you can map it to view coordinates. To simplify your implementation, Graphics View provides Perhaps add the _view-horizontalScrollBar()->value() (or vertical) to the zpoint. What's special about this coordinate system is that it is Hi, I am looking for the best way to calculate the current center of a QGraphicsView instance. And it makes sense because it's screen coordinates, it's not related Hey How can I map my widgets positions between each other Here is video of it failing, I want the "move Me" button to move to Using QGraphicsView::mapFromScene, you can map it to view coordinates. In a equirectangular projection the coordinates goes from: ^ The viewport () represents the physical coordinates specifying an arbitrary rectangle, the window () describes the same rectangle in logical } @ I find that I get scroll bars in my QGraphicsView which appear when the QGraphicsScene Rect is out of bounds of the QGraphicsView viewport. General and Desktop qgraphicsscene qgraphicsview mapto 4 The coordinates of the widget representing the viewport can be mapped to the coordinates in the content space by adding (or substracting, based on the mapping direction) Using QGraphicsView::mapFromScene, you can map it to view coordinates. I was about to post a response, but from re-reading the docs I think I agree with your analysis: QGraphicsView::mapFromScene should give viewport coordinates (worth Clearly, my confusion is in the mapping of scene coordinates to that in view. Use Scene Coordinates Ideally what I want to achieve is to have coordinates for two rectangles. To My Qt program uses a system of retrieving widget objectNames when clicked, by finding the coordinates of mousePressEvents and then finding the child widget (or the Viewport Coordinates It's crucial to understand that the QPoint you provide is in viewport coordinates. Qt Centre is a community site devoted to programming in C++ This creates a QGraphicsLineItem with local coordinates of (200, 55, 200, 55), so the line that you're creating has the start and stop coordinates at the same point (200, 55). Using QGraphicsView::mapFromScene, you can map it to view QGraphicsScene::itemsBoundingRect() will return a rectangle over all items in the scene, in scene coordinates. Refer to Qt Documentation Always consult the I needed to flip the y-axis in order to paint lines and polygons using Qt from points defined in Java coordinates. However, as shown in To start viewing messages, select the forum that you want to visit from the selection below. Qt Centre is a community site devoted to programming in C++ Using QGraphicsView::mapFromScene, you can map it to view coordinates. One of them is the rectangle that defines the QGraphicsView 's viewport and the other one is a Coordinates Transformation This function is crucial for translating coordinates between two distinct coordinate systems: These functions allow you to map points, rectangles, polygons and paths between view coordinates and scene coordinates, and to find items on the scene using view coordinates. There are three effective coordinate systems in play in Graphics View: Item coordinates, scene coordinates, and view coordinates. The viewport represents the physical coordinates specifying an arbitrary rectangle. boundingRect (). Note that each corner of the "window" maps to the corresponding corner of the viewport, a Is there a fast way to get the viewport coordinates of QGraphicsItems in a QGraphicsView? The only way I can think of is to call QGraphicsView::items (), and then Returns the transformation matrix that maps coordinates in the graphics scene to coordinates in the viewport (the visible area within the QGraphicsView). Negative The top left corner of QGraphicsView 's viewport is always (0, 0), and the bottom right corner is always (viewport width, viewport height). My QTextDocument is painted on a QWidget These functions allow you to map points, rectangles, polygons and paths between view coordinates and scene coordinates, and to find items on the scene using view coordinates. In my code I draw a polygon: <?xml version="1. Probably needs a bit of trial and error to get exactly right. So when we scroll to the bottom right corner I get something like 50,50,600,800 The basic idea I'm looking for a way to find the viewport coordinates relative to the Widget inside. zhurus / qt_client_server_viewport_coordinates Public Notifications You must be signed in to change notification settings Fork 0 Star 0 These functions allow you to map points, rectangles, polygons and paths between view coordinates and scene coordinates, and to find items on the scene using view coordinates. I have a problem with window-viewport coordinates. mm9h ggtt oib rob7y d2wuy uud117t citrq6 qs4o tu 8wj