| Summary: | Human-computer interaction interfaces based on hand-drawing are currently being used more and more widely. Hand-drawing is a natural and easy way for designers to do this. Most interfaces currently provide designers with only one smoothly drawn stroke, rather than the multiple strokes they are more accustomed to using. This paper is based on an algorithm for hand-drawn interfaces, which analyses multiple strokes and replaces them with a single stroke in order to rationalise the designer’s creative intent. The space is subdivided recursively until only one stroke remains or a suitable order is achieved using principal component analysis, then the subdivided space is reconnected and a large list of points is produced; finally, because the curve is very noisy, the algorithm uses reverse subdivision to find control points to fit a smooth B spline curve.
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