Dda Line Drawing Algorithm Tutorial

Dda Line Drawing Algorithm Tutorial : Line drawing algorithm and antialiasing techniques

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The angle that these techniques are applied may remain constant within a drawing, or it may change in response to the angle and direction of the forms. For example, cross-hatching may flow around the surface of an object in a similar direction as cross contour lines. These techniques are also a great way to create the illusion of texture (see our article about observational drawings).

Blind Drawing Exercises: Blind drawing is an excellent way to start a high school Fine Art programme. Drawing wobbly lines that bear little resemblance to the chosen object is relaxing and stress-free. Often, a classroom bubbles with laughter at the unexpected results. Blind drawing stretches the arms and soul; eases you into observational drawing without fear.

When we first picked up a pen or pencil and started making marks on paper, we began with line. Whether self-taught, through trial and error, or guided by others, we learned how line defines form, creates structure, divides a frame, traces contour, creates tonal variation (cross-hatching, for example) and leads the eye from one part of a work to another. Initially a mechanism for getting outlines onto paper – identifying edges – we begin to applaud lines for their own merit: celebrate their presence…whether a quiet flick of charcoal on paper or a streak of graphite.

Contour Drawing Exercises: Using line alone eliminates the challenge of applying tone, colour and mediums; and instead focuses attention solely upon shape and proportion. After completing warm-up activities such as blind and gesture drawings, slower, more formal contour drawings can be an excellent way to begin more realistic representations of your subject matter. Used intermittently throughout projects, contour drawings can also be helpful for the student who needs to work faster.