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Source code

function calculate(bars, ctx) {
  const isBars = ctx.input('Base color on prev close', false);
  const barWidth = ctx.input('Line Thickness', 3, { min: 1, max: 10, step: 1 });
  const bullColor = ctx.input('Bull Color', '#00be04');
  const bearColor = ctx.input('Bear Color', '#ff0000');

  const barColors = [];

  for (let i = 0; i < bars.length; i++) {
    const b = bars[i];
    let color;

    if (isBars) {
      if (i === 0) { barColors.push(null); continue; }
      color = b.close >= bars[i - 1].close ? bullColor : bearColor;
    } else {
      color = b.close >= b.open ? bullColor : bearColor;
    }

    barColors.push(color);

    const bodyTop = Math.max(b.open, b.close);
    const bodyBottom = Math.min(b.open, b.close);

    // Upper wick only (above body)
    if (b.high > bodyTop) {
      ctx.line(i, b.high, i, bodyTop, { color, lineWidth: barWidth });
    }

    // Lower wick only (below body)
    if (b.low < bodyBottom) {
      ctx.line(i, bodyBottom, i, b.low, { color, lineWidth: barWidth });
    }
  }

  // Recolor candle bodies to match so the body covers any overlapping line
  ctx.barcolor(barColors);
}