The indicator plots the bars of the specified symbol in the separate window.
The DRAW_BARS drawing style is used to plot the bars using the values of 4 indicator buffers with Open, High, Low and Close prices. The bars color and width changed after N ticks. The N variable is defined as input parameter, it can be changed using the “Properties” window.
Note that initial properties of the plot1 graphic plot (DRAW_BARS) are defined using the #property preprocessor directive, further these properties changed randomly (OnCalculate() function).
See also: The Drawing Styles in MQL5.