mirror of
https://github.com/mihakralj/QuanTAlib.git
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Miha Kralj
61 lines
2.6 KiB
Plaintext
61 lines
2.6 KiB
Plaintext
// Licensed under the Apache License, Version 2.0
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// © mihakralj
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//@version=6
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indicator("Swing High/Low Detection", "SWINGS", overlay=true)
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//@function Detects swing highs and swing lows using lookback period
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//@param lookback Number of bars on each side to confirm swing point
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//@param source_high Price series for swing high detection (typically high)
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//@param source_low Price series for swing low detection (typically low)
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//@returns Tuple [swing_high, swing_low] with swing point values (na if no swing)
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swings(simple int lookback, series float source_high, series float source_low) =>
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if lookback <= 0
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runtime.error("Lookback must be greater than 0")
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if lookback > 100
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runtime.error("Lookback exceeds maximum of 100")
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bool is_swing_high = true
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bool is_swing_low = true
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if bar_index < lookback * 2
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is_swing_high := false
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is_swing_low := false
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else
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float center_high = source_high[lookback]
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float center_low = source_low[lookback]
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for i = 1 to lookback
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if source_high[lookback - i] > center_high or source_high[lookback + i] > center_high
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is_swing_high := false
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if source_low[lookback - i] < center_low or source_low[lookback + i] < center_low
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is_swing_low := false
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float swing_high_value = is_swing_high ? source_high[lookback] : na
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float swing_low_value = is_swing_low ? source_low[lookback] : na
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[swing_high_value, swing_low_value]
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// ---------- Main loop ----------
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// Inputs
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i_lookback = input.int(5, "Lookback Period", minval=1, maxval=100, tooltip="Number of bars on each side to confirm swing point")
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i_source_high = input.source(high, "Source High", tooltip="Price series for swing high detection")
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i_source_low = input.source(low, "Source Low", tooltip="Price series for swing low detection")
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i_show_high = input.bool(true, "Show Swing High Lines")
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i_show_low = input.bool(true, "Show Swing Low Lines")
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i_color_high = input.color(color.red, "Swing High Color")
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i_color_low = input.color(color.green, "Swing Low Color")
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// Calculation
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[swing_high, swing_low] = swings(i_lookback, i_source_high, i_source_low)
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// Track last confirmed swing points
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var float last_swing_high = na
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var float last_swing_low = na
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// Update swing levels
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if not na(swing_high)
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last_swing_high := swing_high
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if not na(swing_low)
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last_swing_low := swing_low
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// Plot swing levels as continuous lines
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plot(i_show_high ? last_swing_high : na, "Swing High", color=i_color_high, linewidth=2, style=plot.style_line)
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plot(i_show_low ? last_swing_low : na, "Swing Low", color=i_color_low, linewidth=2, style=plot.style_line)
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