GDS Renko Canvas + Donchian

GDS Renko Canvas + Donchian is a compact educational indicator for MetaTrader 5. It renders classic fixed-size Renko bricks on a single CCanvas bitmap layer and overlays a Donchian Channel calculated directly from completed Renko bricks.

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.