The Q-period Stochastic Index indicator from the book "Momentum, direction and divergence" by William Blau, implemented in the form of a color histogram.

The indicator uses SmoothAlgorithms.mqh library classes (must be copied to the terminal_data_folder\MQL5\Include). The use of the classes was thoroughly described in the article "Averaging Price Series for Intermediate Calculations Without Using Additional Buffers".

Figure 1. The BlauTStochI indicator