Method and device for quickly constructing wireframe diagram labeling curve

Abstract

The invention discloses a method and a device for quickly constructing a wireframe diagram labeling curve. The method comprises the steps of: obtaining a thinnest line body region through line body thickness analysis in a range determined on a wireframe diagram by marking two endpoints of a curve; carrying out weighted linear regression analysis on the points in the thinnest line body region to obtain a fitting straight line; further obtaining a fitting straight line normal vector; calculating a difference angle according to the normal vector and the two endpoint vectors; linearly mapping thedifference angle into an angle within a small range according to the position relationship between the central point of the thinnest line body region and the two endpoint line segments; determining two points according to the angle vector in combination with the two endpoints of the thinnest line body region, and finally constructing a third-order Bezier curve by combining the two points with thetwo endpoints to form a final labeling curve. According to the method, one annotation curve can be constructed only by inputting the indication endpoints and the character endpoints of the annotationcurve, the interference of the generated curve on an original image is small, and the indication of the curve is clear.

Description

technical field [0001] The invention relates to the generation of marked curves of wireframe diagrams or wireframe sketches in technical documents. Background technique [0002] Technical documentation often needs to be indicated by annotating a part of the wire-to-wireframe diagram. Dimension lines are divided into straight lines and curved lines. When drawing by hand, curves are generally used, because it is difficult to draw straight lines by hand, and the drawing is not straight and twisted. It is better to draw directly as a curve, and the line is smoother. In computer graphics, straight lines are often used for labeling lines, because straight line drawing is more convenient, but straight lines are easy to cover the original wireframe, especially when there are many labeling lines. For this reason, the labeling lines are also drawn as curves. Compared with the straight line, the curvilinear labeling line can bypass the part with more lines in the wireframe diagram, s...

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention: when the wireframe diagram of the technical document is marked with a curve, it is inconvenient to draw, time-consuming and labor-intensive

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