#Mouse coordinates in qt how to
#Mouse coordinates in qt code

Not global, but hopefully the position within your application is. The best I can suggest is to use the Item::mapToItem () function to map to your. The above is all the ideas to solve my needs. QMouseEvent conteins globalX and globalY. # The parameter pos is a pixel coordinate, which needs to be converted into a scale coordinate ClientX: It gives the horizontal coordinate of the event. So, the task is to find the coordinates of the mouse over the screen. This means that vertical zero is topmost point and horizontal zero is the leftmost point. # After capturing the click event, the actions to be done are completed in the mouseover function, mainly extracting the coordinates of the points The top left corner of the screen is (0, 0) i,e, X and Y coordinate is (0, 0). The main codes of mouse movement are as follows: # Capture mouse movement events So in the whole program, I used two trigger events, one is mouse click and the other is mouse movement. After testing, the coordinates extracted by moving the mouse event are accurate. Normally, the return value of sigMouseClicked is an event, which contains the coordinates of the click time, but this coordinate is inaccurate, which is somewhat different from the actual position. # After capturing the click event, you need to do the action in mouse_ Completed in the clicked functionī) Get the coordinates corresponding to the graphic position when the mouse clicks.

#Mouse coordinates in qt code

The main code is as follows: # Capture mouse click events In practice, I also divide this part into two steps: a) capture the mouse click signal.

#Mouse coordinates in qt how to

I haven't used pyqt before, so I don't know how to capture the mouse click signal, let alone extract the corresponding position coordinates. (self.updateData)ģ) Left click the drawing interface to add a new point. To obtain the desired functionality we need to subclass QGraphicsScene and QMainWindow. This is demonstrated on an example that has two operation modes, namely drawing and selection mode. # Start the timer and notify to refresh the data every 100ms This article shows how to draw a QGraphicsLineItem with mouse coordinates during run time. # Give the X and Y coordinates of points and draw a scatter diagramĢ) After the number of nodes or coordinates change, the position can be updated in real time. Self.scatter = .plot(pen=None, symbol='o') My requirements are mainly divided into the following parts: 1) Given the node coordinates, it can be displayed in the form of scatter diagram. I learned from the online code, combined with my own needs, and finally realized the functions I needed. After a search, I found that pyqt seemed to meet my needs, and I could find some relevant code. It feels that matplotlib completely depends on data-driven (that is, it can draw pictures by providing data), but it can not realize the two-way interaction between users and graphics (that is, users can generate new points by clicking with the mouse). However, it seems that it can not achieve the functions I need. In ordinary python drawing, my commonly used tool is matplotlib. In a recent project, the required function is to use the mouse to add nodes (the position where the mouse clicks is the node coordinates), and the point coordinates can be displayed visually and dynamically after being added. It will only stop propagating with the Qt::WA_NoMousePropagation attribute.1) Problem motivation and usage scenarios You will get the same events for QEvent::HoverMove, except that the event always propagates to the top-level regardless whether the event is accepted or not. Now, if you move the cursor from the top to the bottom in the middle of A, you will get the following QEvent::MouseMove events: Let us consider a top-level window A containing a child B which in turn contains a child C (all with mouse tracking enabled): QEvent::HoverMove is also slightly different from QEvent::MouseMove. However, they are slightly different because we do an update() in the event handler of HoverEnter and HoverLeave. already be updated when the mouse is moved over the widget with the button pressed.

There are a few similarities between the events QEvent::HoverEnter and QEvent::HoverLeave, and the events QEvent::Enter and QEvent::Leave. These logical coordinates then form the parameters for the signal. The function pos() gives the current cursor position, while oldPos() gives the old mouse position. Mouse events occur when a mouse cursor is moved into, out of, or within a widget, and if the widget has the Qt::WA_Hover attribute. The QHoverEvent class contains parameters that describe a mouse event. In QT, the mouse click position and the geometric position of the control are inconsistent tags: QT Problem description: Created a mainwindow type program with two label controls AB placed on it QMenu::exec returns a QAction pointer, which is the clicked item, or a nullptr if no item was clicked This function was introduced in Qt 5 If I comment.