YTD % / Visible Range % TableAUTHOR: Brandon Gum
DATE: 2026-01-03
// PURPOSE:
// Calculates price-range metrics based on the *currently visible*
// portion of the chart. Intended for table-based UI display where
// values must be stable and evaluated only on the last bar.
//
// Originally based on Jeff Sun's ADR price data table.
//
// METRICS RETURNED:
// - Visible High
// - Visible Low
// - Visible % Range = (Visible High - Visible Low) / Visible Low
// - Visible ATRs = (Visible High - Visible Low) / ATR
//
// IMPLEMENTATION NOTES:
// - Logic executes ONLY on barstate.islast to avoid state corruption.
// - Visible range is recomputed atomically using a backward loop
// bounded by chart.left_visible_bar_time.
// - Avoids var-based accumulation and bar-by-bar resets, which are
// unreliable when visible window changes.
// - ATR is evaluated at the current bar (not averaged over range).
//
// ASSUMPTIONS / LIMITATIONS:
// - Uses chart-visible time boundaries supplied by TradingView.
// - Loop upper bound must be sufficiently large to cover max
// expected visible bars.
// - Intended for display purposes, not signal generation.
//
// SIDE EFFECTS:
// - None. No plots, no drawings, no state persistence.
