Ineractive x|y projection of TH2Fs

[ferhue]

See this app extending this method:

TH2 x y projection interactive viewer

2D histograms are very useful for visualizing data, but are limited when it comes to quantify gradients and structures based on the color map, or when it comes to compare two different 2D histograms. Normally, one tends to project on the x or y axis, or to draw 1D profiles along a given direction. Currently, the option SetShowProjection method is a helpful tool to do that analysis interactively. In this app, I extend this idea with a class that does simultaneously x/y projections allows inter…