Graph drawing method and system based on WPF technology

Abstract

The invention provides a graph drawing method and system based on the WPF technology. The graph drawing method includes the steps that firstly, a background thread receives time domain data collected by a data collection device; secondly, the time domain data are processed into frequency spectrum data by the background thread through fast Fourier transformation; thirdly, the spectrum data are mapped by the background thread through a set color gradation so as to obtain the RGB value, corresponding to a complete frequency spectrum line, on a displayer; fourthly, the frequency spectrum line is stored into a cache; fifthly, whether the cache is full or not is judged, the sixth step is executed if the cache is full, and otherwise the third step is executed; sixthly, a foreground main thread is informed by the background thread to draw the frequency spectrum line. The graph drawing method and system based on the WPF technology have the advantages that when a Doppler frequency spectrum graph is drawn, the consumption of CPU resources can be greatly reduced, and working efficiency can be improved.

Description

technical field [0001] The invention relates to a graphic data processing method and system, in particular to a method and system for drawing graphics based on WPF technology. Background technique [0002] Compared with the general waveform drawing, the drawing of Doppler spectrogram is characterized by a larger amount of data. The drawing of ordinary waveforms is to connect the points occurring on the time series in a coordinate plane to form a complete waveform. Only one point needs to be drawn on one time latitude, while the Doppler spectrogram needs to be drawn on one time latitude, and every pixel point in the coordinate plane needs to be drawn. That is to say, ordinary waveforms are drawn as lines, while Doppler spectrograms need to consider the situation of drawing planes. [0003] At this time, the general method of drawing a line graph will not be available. For example, the patent "Implementation method of Java-based embedded spectrum analyzer display interface" ...

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Problems solved by technology

[0003] At this time, the general method of drawing a line graph will not be available. For example, the patent "Implementation method of Java-based embedded spectrum analyzer display interface" (patent application number 201010620822.1, publication number CN102156639B) applied by Beijing Aerospace Measurement and Control Technology Development Corporation, This patent uses the function of DrawLine (a straight line connecting two points) to draw the waveform, and a series of feature points in the Doppler spectrogram need to be connected on the plane coordinate system. This method will consume a lot of CPU resources.

[0004] That is, the current method for drawing the Doppler spectrogram will consume a large amount of CPU resources and reduce work efficiency

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