Problems with trailing lines on chart

[w4rn1ng]

Hi, i'm trying to write an indicator that draw trailing-like lines on a chart.

Now, we have 2 Plots or output, ideally when a specific condition is met, the plot of the greenline should be somewhere below the current price, while the redline plot should be just null, in other words it must not be visible on the chart.

The problem is, i don't know how to make them be not visible (just be an empty value), what happen is that if no value is assigned to a plot, it automatically become "0".

However as you can see in this chart, the effect on chart is just wrong, i mean lines going to 0, they must disappear from the chart, not go to 0, deforming the whole chart.

Any suggestion on what to do?

i tried to assign "null" to the not used output, but the compiler say it is not possible to do it.

[NinjaTrader_PaulH]

Hello w4rn1ng,

Thanks for your post and welcome to the forums!

You can make plot sections not visible by not assigning anything to them for that specific bar where it is not needed. So only assign a value to the plot when you want to see the plot.

For example, if I had a plot called MidLine and did this:

if (Close[0] > Open[0])
{
MidLine[0] = SMA(10)[0];
}

What will be plotted would be an SMA line when there is an upbar (Edit: More than one upbar in a row to draw the plot line). See attached visual example, Red line for upbars.

[w4rn1ng]

Very great, thank you!