The patterns in the pattern files of computerized embroidery machines and electronic pattern machines are all based on the stitch unit with control information as the basic pattern unit, which is very in line with the characteristics and needs of sewing equipment, and is different from traditional dot matrix graphics and Vector Graphics. The data of the pattern file mainly includes pattern information and sewing action information, which will be used for sewing control of each stitch. For the convenience of description, the article first gives the following definitions: a vector is made from the starting point of the pattern as the starting point and the ending point as the end point, which is called the starting and ending vector of the pattern; the data representing a stitch in the pattern is called It is a sewing unit or a sewing frame; if 0.1mm is set as 1 step, the numerical values involved in the text, such as the displacement of stitches, are measured by the number of steps, such as the displacement of the stitches, xmax, xmin, ymax, ymin, etc.

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