Metatrader 5 Indicator | GDS Renko Canvas + Donchian | MQL5 Release

The horizontal axis represents Renko sequence rather than time. The internal builder uses incoming BID ticks and the classic two-brick reversal rule. The Donchian Channel is causal: for each newly completed brick, the channel is calculated from the previous N completed Renko bricks only. The current brick is excluded from its own channel calculation.

Inputs:

- Brick Size — fixed Renko brick size in price units.

- Donchian Period — number of previous completed Renko bricks used for the channel.

Features:

- classic fixed-size Renko built internally from ticks;

- one CCanvas bitmap layer instead of hundreds of chart objects;

- square Renko bricks;

- stepped upper/lower Donchian boundaries plus channel midpoint;

- no offline chart;

- no custom symbol;

- no DLL;

- no external indicator dependency.

This is an educational visualization example, not a trading system or a recommendation to trade Donchian breakouts.