XY3DDensityPlot

代码说明：

  2011版 3D密度图形生成程序。 可用于就有两个变量的函数对其视觉化。 图形的每一个点代表一个密度值。(XY3DDensityPlotView is used to visualize the density of points described by two variables X and Y, as a surface plot. This may be useful when points are densely packed and overlapping, as in this case a scatterplot may be limited in revealing their actual distribution.)