sisakat / SiImageViewer

Simple Qt Image Viewer Widget with support for panning, zoom and rotation.

Qt Image Viewer

Simple Qt Image Viewer Widget with support for panning, zoom and rotations. Implemented as an QOpenGLWidget.

Usage

Follow these instructions to embed the image viewer into your project:

1. Add siimageviewer.h and siimageviewer.cpp to your project.
2. Create an empty widget and promote it to SiImageViewer.
3. Call setImage(const QImage& image) to set the current image.

All you need to show an image is a QImage instance, which can be created from memory or file.

Shortcuts

Shortcut	Description
Scroll Wheel	Fast zooming
Shift + Scroll Wheel	Precise zooming
Scroll Wheell Press	Panning
Ctrl + R	Rotation in 90 degree steps
R + Left Mouse Button	Rotation in 90 degree steps
Shift + R + Left Mouse Button	Precise rot. around cursor
R	Reset all transformations

Building

To get a quick look the repository contains a small main window where you can open an image and interact with the viewer.

To build this project open it in QtCreator or manually build it given the CMakeLists.txt.