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›› 2015, Vol. 32 ›› Issue (1): 116-120.DOI: 10.7523/j.issn.2095-6134.2015.01.019

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Curve plotting method for large-capacity data based on VC++ 2008

MA Zhigang1,2, LIU Wenyi1   

  1. 1. Key Laboratory of Instrumentation Science & Dynamic Measurement of Ministry of Education, Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China;
    2. College of Information Science and Engineering, ShanXi Agricultural University, Taigu 030801, Shanxi, China
  • Received:2014-03-19 Revised:2014-04-25 Online:2015-01-15

Abstract:

In view of the data extraction problems in large-capacity data curve plotting, the "data reading by-block" → "data join"→ "data extraction" achieving finally "full extraction" process is proposed, which can achieve the processing of the large-capacity data file over 4 GB. When the data quantity is large, conventional curve plotting methods may give rise to the low efficiency or the flicker problem in the plotting area. The "Polyline" function is employed to optimize the plotting program, and greatly improves the plotting efficiency. The dual-buffering method is adopted to eliminate the flicker in plotting area, and thus further shortens the drawing time.

Key words: large-capacity data, curve plotting, VC++ 2008, Polyline, dual-buffering

CLC Number: