The indicator plots sections between the High and Low prices of the bars.
The color, width and style of the sections changes randomly each N ticks. Note that initial properties of the plot1 graphic plot (DRAW_SECTION) are defined using the #property preprocessor directive, further these properties changed randomly (OnCalculate() function). The N variable is defined as input parameter, it can be changed manually using the "Properties" window.
See also: The Drawing Styles in MQL5.
Translated from Russian by MetaQuotes Software Corp.
Original code: https://www.mql5.com/ru/code/331
The DRAW_LINE style is used for plotting the values of the indicator's buffer as a line.DRAW_NONE
The DRAW_NONE drawing style is used in cases, when you need to calculate and show the values of the indicator in "Data Window", but the plotting isn't needed.