Problem to plot 3D graph using QWT

[johnMick]

Hi,
I am newbie to the QT and QWT and I have to plot some 3D graph in QT and expected graph should be like attached picture(acttached picture is the plotting of value) but i am not getting any clue how to start plotting of this graph even i tried spectrogram contour graph example of QWT too but not able to understand the flow to plot this graph.Please help me to solve this problem.(It will be helpful if i will get some sample code to plot this type of graph using QWT)