Drawdown Depth Field

Drawdown from the rolling high on 24 lookbacks, as a heatmap, with the underwater curve of the longest lookback as a gradient area on top. Each row is the distance below the highest high of its lookback in ATR units, so the field reads the same on any instrument. Reading: dark rows are at their highs; a hot bottom with a dark top = a shallow pullback inside a larger advance (buyable); heat climbing to the long rows = a real correction. The underwater strip shows depth and how long it has lasted. Signals: deep drawdown and recovery confirmation (a new long-lookback high after a deep drawdown).

1. 1
   Compile

   The QuaScript compiler checks the 49-line script (41 lines of code) and lowers it for the native C++ engine. Compile errors point at the exact line and column.

2. 2
   Place

   The header sets pane = hpane with height = 0.3 (30% of the chart), so the output gets its own pane under the price with its own scale.

3. 3
   Compute

   The script runs once per bar, oldest to newest. Each bar also runs one loop (1 for). 2 persist variables keep state (objects, counters) across bars.

4. 4
   Stay live

   On the terminal the script keeps one live engine session: a tick rolls the forming bar back to its checkpoint and re-executes only that bar, and new bars are appended, so history is never rerun while the market moves. The live result is identical to a full run.

5. 5
   Render

   The results are handed to the chart: series on WebGPU, drawings on the Canvas 2D QuaScript layer.

6. 6
   Tune

   3 settings in 2 groups appear in the chart's settings dialog. Changing one reruns the engine with the new value.