# Line Drawing Using Bresenham Algorithm

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This article contains exercises for Art students who wish to produce contour line drawings, cross contour drawings, blind drawings and other types of line drawings. It is a teaching aid for high school Art students and includes classroom activities, a free downloadable PDF worksheet and inspirational artist drawings.

A cross contour drawing contains parallel lines that run across the surface of an object (or radiate from a central point), such as those that appear on a topographical map or a digital wireframe. The lines can run at any appropriate angle (sometimes at multiple angles) and may continue across objects and into the background. Cross contour drawings typically follow the rules of perspective, with lines drawn closer together in the distance and further apart in the foreground. In this type of drawing, the illusion of three-dimensional volume is created entirely with line.

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.

Most famous for his post-impressionist paintings, Vincent van Gogh also produced over a thousand drawings. In this pen and pencil line drawing, ‘Cottages With a Woman Working in the Foreground’, we see the stylistic swirling of line in the trees and clouds that is so characteristic of his well-known paintings. Capturing the swirling of the trees and the movement of the clouds, van Gogh represents the light falling across the textured landscape with quick, confident mark-making.