In this example, we perform the same painting operations on a QWidget and a QOpenGLWidget. The only difference is that the painting operations will be accelerated in hardware if it is supported by your system's OpenGL drivers. Since QOpenGLWidget is a subclass of QWidget, it is possible to reimplement its paintEvent() and use QPainter to draw on the device, just as you would with a QWidget. Heavy vs Light, Rough vs Soft, etc.The QPainter class is used to draw 2D graphics primitives onto paint devices provided by QPaintDevice subclasses, such as QWidget and QImage.

Contrast – When one extreme is pitted against another.

An example is the e xaggerated proportions in caricatures.

Proportion – The relative size of different elements of an artwork.

Golden Rectangle – Another method of arranging a composition. This tends to be the natural placement of visual focus, and is also sometimes referred to as museum height. Visual Center – The visual center of any page is just slightly above and to the right of the actual (mathematical) center. Basically, take any frame of reference and divide it into thirds placing the elements of the composition on the lines in between.

Focus/Emphasis/Dominance – the prime center of visual importance within a composition to which all other visual elements yield it holds the viewer’s attention because of its attractive and dominant influence on its surroundings Rule of Thirds – a compositional tool that makes use of the notion that the most interesting compositions are those in which the primary element is off center.

Pattern – any compositionally repeated element or regular repetition of a design or single shape pattern drawing sin commercial art may serve as models for commercial imitation.

Repetition/Rhythm – a repeating visual element (line, shape, pattern, texture, movement) a flowing and regular occurrence.

There are no specific rules for asymmetrical balance except that of diversity Symmetrical = dividing a composition into two equal halves with seemingly identical elements on each side.Īsymmetrical = balance based upon a visual sense of equilibrium that can be felt more than it can be measured.

Balance – can be Symmetrical or Asymmetrical.

Color – (we won’t use color in Beginning Drawing).Value/Tone – Relative lightness or darkness.

Shape – Flat, 2D aspects of form, as opposed to volume (think silhouette).Line – The way we treat our lines establishes a particular/dominant mood/emotion.

Paint 2 d