实现快速傅立叶算法，采用vc windows编程显示傅立叶变换后的相角图，实部图，虚部图，模图和功率谱密度徒。-Fast Fourier algorithm, vc windows programming using Fourier transform shows that after the phase angle map, real maps, the imaginary part of diagram, modulus map and power spectral density only.