Real-time curve drawing method

Abstract

The invention provides a real-time curve drawing method which comprises the following steps of: reading sampling time and analog quantity real-time values of sampling points; drawing a curvilinear figure by using the sampling time of the sampling points as abscissas and using the analog quantity real-time values of the sampling points as ordinates; comparing the analog quantity real-time values of a current sampling point and a previous sampling point and then drawing a quarter of period of cosine curve on the curvilinear figure by using the point with the small analog quantity real-time value as an origin of coordinates, using the point with the large analog quantity real-time value as a crest or trough point and using four pieces of sampling time as a period; translating the curvilinear figure forward by one period by using one piece of sampling time as the period, judging whether the sampling points on the curvilinear figure reach the boundary of the curvilinear figure, and if the sampling points on the curvilinear figure reach the boundary of the curvilinear figure, deleting the sampling points from a buffer zone; and entering the next circulation. By the method, a smooth, attractive and real real-time analog quantity curve can be drawn; and the method is simple and practical.

Description

technical field [0001] The invention relates to a curve drawing method, in particular to a real-time curve drawing method. Background technique [0002] Depicting the real-time value of the analog quantity with the method of curve graphics can more intuitively reflect the change trend and real-time status of the real-time value of the analog quantity, which is convenient for our understanding and observation. [0003] Since the real-time curve only needs to reflect the data in the current and previous relatively short period of time, the curve graph can be fixed in a fixed short period of time, and the sampling data obtained by fixing the sampling point time can be plotted, and the A simple curve can be obtained by connecting each point; however, the curve obtained by this method is only a static curve, and directly connecting two points with a straight line will make the curve not smooth and not beautiful enough. The reflection of the analog quantity is not realistic enoug...

AI Technical Summary

Problems solved by technology

[0003] Since the real-time curve only needs to reflect the data in the current and previous relatively short period of time, the curve graph can be fixed in a fixed short period of time, and the sampling data obtained by fixing the sampling point time can be plotted, and the A simple curve can be obtained by connecting each point; however, the curve obtained by this method is only a static curve, and directly connecting two points with a straight line will make the curve not smooth and not beautiful enough. The reflection of the analog quantity is not realistic enough