Qt’s 2D graphics engine is based on the
QPainter can draw geometric shapes (points, lines, rectangles, ellipses, arcs, chords, pie segments, polygons, and Bézier curves), as well as pixmaps, images, and text. Furthermore,
QPainter supports advanced features such as antialiasing (for text and shape edges), alpha blending, gradient filling, and vector paths.
QPainter also supports linear transformations, such as translation, rotation, shearing, and scaling.
QPainter can be used ...