Hi Florian, re: your questions…
- For a new bar to be valid, it has to have, at least one tick in the bars time period. A current count of the bars is stored in the variable ‘BARINDEX’. The first bar of a chart is barindex = 0, and is incremented by 1 every valid bar, and where the current candle is the highest value.
Just to explain why I use the word ‘Valid’ for a bar, if their is a bar time period, where there was no tick, then the barindex’s, current number, is not incremented. This could lead to the count of barindex, being different to the count of the time periods.
You are right by saying the current candles index is [0] and, the previous one to that would be [1], and then [2], [3] etc. Now this is where it gets tricky. The current candle is always [0], so you can not directly look back to a specific candle as an index since it points to a different bar every new bar.
If you compare the, barindex and the candle index, the barindex is increasing every bar and the candle index is also increasing but from the opposite end. This, because the candle index shifts to the left by 1 bar on each new valid bar
So the index is actually an offset from the current bar to a previous bar, where the current barindex is the reference point.
Looking back to close[10] give the value of close 10 bar prior to the current barindex. After a new bar , then it still points to 10 bars ago but the reference point as change because barindex has been incremented by 1.
Therefore to access the same candle, you need the barindex number, or the offset in bars since, for that candle, let say it was at barindex 300, subtract that from the current barindex, lets say 550, 550-300 = 150, then the candle offset from current bar = 150, close[150] or close[barindex-300].
Now I think the draw command use the reference point from the other end, so you need the offset from barindex = 0, to the bar you want, which I end up with barindex[barindex- 300].
2. lines
#4 candleNumber sets the number of candle required
#8 period is set to 1 less than candleNumber, because array starts at index[0] , this aligns to give correct number required.
#15-20 loads array ‘backward’ from current bar.
# 26 creates a loop for the drawing of the candles in the future with the store array data
# 28,29,30 ensures as ‘i’ increases the offset increase points to the next future bar, the +1 just set the start point to the first future bar when i=0.
# 32 remember the data was stored backwards from the current bar in the array’s, but the future bars are being index forward, so the array needs accessing from last to first, which period – i does.
if i=0, then 0+1 points to first future bar, barindex+1, if period = 9 {0 to 9} then 9-0 = 9 for array index. Next time, when i=1, barindex + 2, 9-1 = 8, etc
Regarding the rest i’ll look into it, posting code would be helpful, at least we would be on same page talking about same thing.
I’m sure I have several questions, but here’s the first,
the first code I posted, made a patten using a number of bars, this pattern is going to change every new bar, is this what initiates the pattern or is it some other criteria.
