Labels:text | screenshot | font OCR: A A A B B Fig2-1: A patch defined by 4 spline segments from 4 different splines. Fig2-2: Two patches defined by 5 spline segments from 3 splines. The patches shares a segment. Fig2-3: One spline forming a closed loop. This doesn't define a patch, as all 4 segments mustn't be on the same spline! Fig2-4: Two connected splines. The area enclosed by these splines does NOT form a patch, because 5 segments are used to surround the area. Fig2-5: Two closed 4-knot splines connected with four 2-knot splines. The central area is invisible because of the rule described under Fig2-3, so the result is 4 patches forming a figure with a hole in the middle.
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