Core_Computer Studies : What is a Path? What are direction and anchor points?

Paths are found all over the place when you are dealing with vector graphics. They are - to put it simply the outline of a graphic object also known as Bézier curves.

Illustrator itself describes Bézier curves as "a path consists of one or more segments. Anchor points, which define where each segment of a path starts and ends, "anchor" the path in place. By moving anchor points, you modify path segments and change the shape of a path."

These anchor points that Illustrator refers to are the small squares you see on the line. They are also referred to handles. On curved segments, of a line each selected anchor point displays one or two direction lines, ending in direction points. The position of the direction lines and points determine the size and shape of a curved segment. Moving these elements reshapes the curves in a path. The direction lines are always touching the curve at the anchor points. The slope of each direction line determines the slope of the curve, and the length of each direction line determines the height, or depth, of the curve.

A path can be either open or closed. For instance a circle is a closed path and a squiggly line is an open path.

These notes are written for students who undertake the Core Computer course at School of Art, Australian National University. Students of the course should feel free to contact any member of staff with comments questions and general suggestions..

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