Erroneous drawings on chart, but works fine onload?

Hello.

So I am still a newb, and have obviously screwed something up with my script, but I am not sure what?

My main program is a bit more complicated, but I've stripped this down as much as I can, to replicate the problem, and created a similar logic(just for the purposes of this question).

This program simply takes a 14 and 1 period SMA based on the lows, and when the 1-period, breaks below the 14-period, it records the lowest price achieved before the 1-period breaks back above the 14-period. Once I have this information, I store the Time and price of this lowest occurrence(this point is drawn on the chart with the yellow circles) into an array.

Next, once that infomation is stored, I simply wait for price to CLOSE below that previously recorded time and price which can happen anytime in the future, and then subsequently wait for price to CLOSE back above that level. Once this happens, I draw a line from the yellow circle, to the point where price closes back above it.

You can see this in the image labeled "1."

THe issue I am having, is that when I open my MT4 platform and have this indie on a chart, sometimes it draws erroneous lines. You can see this in the image labeled "2."

However, if I recompile the indie, or switch Timeframes back and fourth, it works perfectly. In real time, as long as the indicator has been added to the chart, it works perfectly. If the chart is blank, and I add the indie, it works perfectly. After switching Timeframes and reloading the chart, you should see how this chart SHOULD look, in the image labeled "3." In the third image, you can see the erroneous lines are gone.

The issue is just after I reopen MT4 with the indicator previously having been on the chart.

Just a few notes... my indicator is calculated onBarClose... I.e., I am only performing calculations once a brand new bar opens, once per bar.

So I am wondering, if there is a convention I am missing to deal with this type of situation? Should I add something to make the chart reload automatically every time MT4 is opened?

As mentioned, I've added a simplified, stripped down version of my script that reproduces this problem. Is there something I'm missing?

Usually this error situation means the values provided by MT4 have not been fully loaded or initialized. An example is when code has fully run through all bars from the first OnTick but IndicatorCounted() still equals 0 on the next OnTick. I normally just add in a init flag and line to prevent my code from running if so.
bool initsw=true; is declared globally
and after all the code that needs to run first is finished
if(initsw)initsw=false;
to prevent code running I just place this line before my lookback
if(!initsw&&IndicatorCounted()==0)return(0);
Here is an code example of a similar situation and the implemented fix https://www.forexfactory.com/attachm...9&d=1559340604

Yes, you completely ignored error handling in your code. With error handling you would discover that your array
is not correctly initialized. It contains "0" values which are interpreted in "PlotBases(int i,int j)" as
Now that time is in the past and at the very left side of the chart. That's why - when it happens - your lines draw to the left.

Add error handling to each function, and you will see the errors when they happen. Most probably that's plenty of ERR_ARRAY_INDEX_OUT_OF_RANGE.

Bruh, thanks for the help on yet another one of my projects!

Before I tried your solution. I tried one that I found in the docs which was:

The above didn't work.

I've been playing with your solution the last couple of days, trying to understand what was going on. I haven't seen the same issue since adding your solution, but I'm not sure yet as the problem does not occur every time I load up a chart, all dependent on the bars processed I suppose, but seems to be ok so far.

I figure worst case if that doesn't work, I might just be able to build a check to my function that draws lines, that if the x2 value that I pass into the function is not larger than x1, then don't draw a line.

I don't know why IndicatorCounted() would return a negative bar count. I think it would be I also add in other places to prevent code from running during the initial lookback.