TrendLine

// Function to create and update Horizontal lines
HorizontalLine(color, lookback, isLowest) =>
    var line_ = line.new(bar_index[0], high[0], bar_index, low, color=color)
    value = isLowest ? ta.lowest(low, lookback) : ta.highest(high, lookback)
    bars = isLowest ? ta.lowestbars(low, lookback) : ta.highestbars(high, lookback)
    line.set_xy1(line_, bar_index[0], value)
    line.set_xy2(line_, bar_index[bars * -1], value)
    line_

// Function to create and positive  trend lines
PositiveTrendLine(color, lookback, adjustment, isChannel) =>
    var line_ = line.new(bar_index[0], high[0], bar_index, low, color=color, extend=extend.left)
    if isChannel
        line.set_xy1(line_, bar_index[0], ta.highest(high, lookback) + adjustment / 2)
        line.set_xy2(line_, bar_index[ta.lowestbars(low, lookback) * -1], ta.highest(low, lookback))
    else
        line.set_xy1(line_, bar_index[0], ta.lowest(low, lookback) + adjustment)
        line.set_xy2(line_, bar_index[ta.lowestbars(low, lookback) * -1], ta.lowest(low, lookback))
    line_

// Function to create negative trend lines 
NegativeTrendLine(color, lookback, adjustment, isChannel) =>
    var line_ = line.new(bar_index[0], high[0], bar_index, low, color=color, extend=extend.left)
    if isChannel
        line.set_xy1(line_, bar_index[0], ta.lowest(high, lookback) - adjustment / 2)
        line.set_xy2(line_, bar_index[ta.highestbars(high, lookback) * -1], ta.lowest(high, lookback))
    else
        line.set_xy1(line_, bar_index[0], ta.highest(high, lookback) - adjustment)
        line.set_xy2(line_, bar_index[ta.highestbars(high, lookback) * -1], ta.highest(high, lookback))
    line_

// Create Horizontal lines 
lowest_low_line   = HorizontalLine(color.lime, _lookback_positive, true)
highest_high_line = HorizontalLine(color.red, _lookback_negative, false)

// Creating the positive trend lines
positive_trend_line    = PositiveTrendLine(color.lime, _lookback_positive, _Self_Adjusts, false)
positive_trend_channel = PositiveTrendLine(color.lime, _lookback_positive, _Self_Adjusts, true)

// Creating negative trend line and channel
negative_trend_line    = NegativeTrendLine(color.red, _lookback_negative, _Self_Adjusts, false)
negative_trend_channel = NegativeTrendLine(color.red, _lookback_negative, _Self_Adjusts, true)