I graduated from the university this year.I want to use QCustomplot to draw day K line graph, I can get histrory-data from sina or Yahoo. ,I can understand the Demo in plot-examples.however in the example.it use timeSeriesToOhlc .I think this static methods just create random data(open ,close,high,low). Now i want to use really data(I get from sina). how to write the code. I tried setdata(). but it doesn't produce correct graph. China's website hava too few information about Qcustomplot.