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.