¿Cómo se hace zoom en Qt?

How do you zoom in Qt?

Zooming is not possible. You can use Tools -> Form Editor -> Preview . If the viewport gets too small the QtCreator shows scrollbars which allow to move the part of interest into view. Note, on some system configurations the scollbars may be very small and hard to handle.

Graphics View uses a BSP (Binary Space Partitioning) tree to provide very fast item discovery, and as a result of this, it can visualize large scenes in real-time, even with millions of items. Graphics View was introduced in Qt 4.2, replacing its predecessor, QCanvas.

Qt (pronounced “cute”) is a widget toolkit for creating graphical user interfaces as well as cross-platform applications that run on various software and hardware platforms such as Linux, Windows, macOS, Android or embedded systems with little or no change in the underlying codebase while still being a native …

Getting Started with Pretty much everything you can do with Qt, you can now do in Python! Check out our how-to guides, tutorials, and examples to get you on the right track from day one. Here’s how you can quickly deliver performant, flexible and scalable Qt applications.

Qt does nearly all the memory management for you as long as you stick with its classes, and provides equivalents to the nice containers you would find in Python. I’ve always preferred statically typed languages, but have gotten on the Python bandwagon for various reasons.

In the following example there is a very simple scene with just one item (a pixmap), which is put into a scene and displayed in a view. By turning on the DragMode flag the scene can be panned around with the mouse and by using the scale and rotate functions it can be scaled in and out with the scroll on the mouse and rotated with the arrow keys.

Because of that zoom is performed using the mouse position when it lost focus, and not the current one. ( https://bugreports.qt.io/browse/QTBUG-73033) 2 – Qt sometimes stops propagating mouse move events when switching windows using mission control, so zoom also misbehaves like in #1. ( https://bugreports.qt.io/browse/QTBUG-73067 ).

The default modifier is Ctrl. * * You can change zoom velocity by calling set_zoom_factor_base (). * Zoom coefficient is calculated as zoom_factor_base^angle_delta * (see QWheelEvent::angleDelta).

These examples demonstrate the fundamental aspects of canvas programming with Qt. Visualizes a huge graphic view scene with 40000 chip items. Combines advanced OpenGL rendering with the Graphics View framework. Demonstrates how to animate items on a graphics view. Demonstrate how to use the Graphics View framework.