2d图表显示，从codeproject上找来的，感觉不错。-2d graph shows control, from the codeproject .

This example will demonstrate the use of the FFT function to calculate\na 2D-FFT. Given that the data represents the width and the delay of two\nsignals this program calculates the 2D-FFT and displays the result on an\nintensity graph. Note that the

Application builds graph(2D), finds center of graph, median and Hakimi algorithm