Abstract:In the computer aided design of doors and windows, the computer only accurate positioning of fan region in the original frame position to further the design of the plastic window. Based on the design software of a door and window, the concept of convex hull in computational geometry is applied to identify the fan regions in the design of plastic steel doors and windows. The convex hull algorithm is used to analyze the frame coordinates to form a convex hull.Using Delaunay triangulation algorithm for convex hull analysis all triangle region The triangulation network is analyzed and merged, and all the fan regions are finally obtained. The convex hull algorithm can overcome the traditional plastic window cannot identify shaped window design software fan area faults, thus greatly expand the scope of design software.
This research works for plain stitch of weft knitted stitch, mainly introduced the curling property of plain stitch and it’s influence factors were given. I will combine with plain stitch's structure characteristics and its unique fringe curling of style to design and produce suitable knitwear to satisfy the increasing needs of ourselves in the modern life. Drape, three dimentional cutting, also means stereo cutting, was taken to the research in order to design and make a middle and long tape skirt with black and gray, together with a white super short T-shirt, we can see the application of fringe culing in the collar, bottom margin, wristband and so on. In short, color in harmony, long and short matching brings to harmonious with nature.
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