Bresenham Line Drawing Algorithm Tutorial

Bresenham Line Drawing Algorithm Tutorial : Bresenham s line drawing algorithm in computer graphics

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This delicate cross contour drawing helps to communicate the bumpy surface of the shell. Note how the shell pieces that are furthest away from the viewer are thin and light, whereas those that are closest are darker and thicker. Note also how the direction of the contour lines relates to the shape of object that is drawn, with lines projecting outwards from the centre of the shell.

Famous artist David Hockey has produced many line drawings – often portraits. He draws in silence, with precision and care, moving a black ink pen across the paper quickly. This portrait – a snapshot into Hockney’s life – is entitled ‘Eugene and Henry’.

This wire drawing exercise ‘using line to create space’ is completed by students within a 3D Art class, working over photographic portraits. Having a base image to work from (this could also be an earlier observational drawing) makes the process of transferring from two-dimensional to three-dimensional much easier.

Pop artist Andy Warhol is famous for his brightly coloured silkscreen artworks; however he was also a rampant drawer – often filling sketchbooks. He won many prizes for the drawings he produced in high school. The illustrations shown above – comprising of slightly smudged and blotchy black lines – have Warhol’s typical off-beat style. They were completed using a basic printmaking technique: pressing sheets of paper into a wet ink drawing, transferring the image to the second sheet.