Box

Box(key, opts) -> handle

const ob = Box("order-block", {
  x1: 5,   y1: 100,
  x2: 15,  y2: 110,
  color: "#a78bfa20",
  borderColor: "#a78bfaFF",
  borderWidth: 1,
  extend: "right",
  text: "Order Block",
  textColor: "#FFFFFFFF",
});

box.set({ color: "#22c55e30" }); // change fill color in place
box.clone("order-block-2");      // copy to new key
box.delete();                    // remove from chart

// Detect bullish order blocks (bearish bar followed by strong bull move)
onBar(() => {
  const prevBear = ctx.open(1) > ctx.close(1);
  const curBull  = ctx.close() > ctx.open(1); // engulf previous bar

  if (prevBear && curBull) {
    const barIdx = ctx.i() - 1;
    Box(`ob_${barIdx}`, {
      x1: barIdx, y1: ctx.low(1),
      x2: ctx.i(), y2: ctx.open(1),
      color: "#22c55e20",
      borderColor: "#22c55eFF",
      borderWidth: 1,
      extend: "right",
      text: "OB",
      textColor: "#22c55eFF",
      textSize: "sm",
    });
  }
});