Weekly Support/Resistance Lines

[dugafish]

I want to draw 2 horizontal lines across my charts (for daily and weekly views) where the high horizontal line is defined as the high of the first trading day of any week (obviously this is usually Monday unless a holiday week) and the low horizontal line is the low of the first trading day of the week. These lines will change/recalculate each week as the highs and lows of the first trading day of the week will change with each passing week

 

[halcyonguy]

I want to draw 2 horizontal lines across my charts (for daily and weekly views) where the high horizontal line is defined as the high of the first trading day of any week (obviously this is usually Monday unless a holiday week) and the low horizontal line is the low of the first trading day of the week. These lines will change/recalculate each week as the highs and lows of the first trading day of the week will change with each passing week

def na = Double.NaN;
def bn = BarNumber();
def w = GetWeek();
def hi2 = high(period = AggregationPeriod.DAY);
def lo2 = low(period = AggregationPeriod.DAY);

def hi;
def lo;
if bn == 1 then {
  hi = 0;
  lo = 0;
} else if w[1] != w then {
  hi = hi2;
  lo = lo2;
} else {
  hi = hi[1];
  lo = lo[1];
}

plot zhi = if hi > 0 then hi else na;
plot zlo = if lo > 0 then lo else na;
zhi.SetPaintingStrategy(PaintingStrategy.HORIZONTAL);
zlo.SetPaintingStrategy(PaintingStrategy.HORIZONTAL);
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