EMA Cross Indicator

[lilzenbca]

Hi all,

I'm very new to this and can't seem to get my head wrapped around the coding for this. I'm looking to make an indicator that would overlay on the price chart and highlight bars that cross over and under an 8 EMA line based on the closing price.

I'm thinking that the logic would look something like this:

If CLOSE(1) => 8EMA(1) and CLOSE(0) < 8EMA(0) then put the indicator over the current price

and

if CLOSE(1) =< 8EMA(1) and CLOSE(0) > 8EMA(0) then put the other indicator over the current price

However, after going through the NT help and tutorials, I'm still a bit lost as to how to code this. Any help, guidance, direction pointing, etc is MUCH appreciated.

Thanks!

[NinjaTrader_DaveI]

Hello,

I'll be happy to point you in the right direction. Firstly, can you tell me a bit more about exactly what you are looking to draw on the chart? Are you looking to draw some kind of marker (like a dot or diamond) on the bar at which the condition occurs, or perhaps to change the color of the bar in question, or something else?

In terms of the syntax for the conditions, what you are looking for can be written as such:

if(Close[1] >= EMA(8)[1] && Close[0] <= EMA(8)[0]
            {
                do something...    
            }
            
if(Close[1] <= EMA(8)[1] && Close[0] > EMA(8)[0]
            {
                do something...    
            }

You can find more information about basic C# syntax at the link below:

http://www.ninjatrader.com/support/helpGuides/nt7/index.html?basic_programming_concepts.htm

I look forward to your reply.

[lilzenbca]

Thanks NT_Dave!

You are correct. I'm looking for an over the bar indicator. I was thinking a green up arrow for an upwards cross and a red down arrow for a downwards cross.

[NinjaTrader_DaveI]

In that case, you can use the DrawArrowUp() and DrawArrowDown() methods to draw arrows above or below the candle at the point at which the condition evaluates to True.

One quick thing to note -- you will need to specify a unique name in the constructor for these methods, so that the older arrows do not get replaced and redrawn. To do this, you can add CurrentBar to a string to ensure that each name is unique. There is an example of this in the help guide page for DrawArrowDown below:

DrawArrowDown(): http://www.ninjatrader.com/support/h...warrowdown.htm

DrawArrowUp(): http://www.ninjatrader.com/support/h...rawarrowup.htm

Please let me know if I can assist further.

[lilzenbca]

OK...wondering what I'm doing wrong at this point. I can get the code to compile, however, there is nothing drawn on the chart when I apply the indicator. I've pasted the code below.

Help...please!

protected override void Initialize()
{
Overlay = true;
}

/// <summary>
/// Called on each bar update event (incoming tick)
/// </summary>
protected override void OnBarUpdate()
{
// Use this method for calculating your indicator values. Assign a value to each
// plot below by replacing 'Close[0]' with your own formula.

if(Close[1] <= EMA(8)[1] && Close[0] > EMA(8)[0])
{
DrawArrowUp(CurrentBar.ToString(), true, 0, High[0] + TickSize, Color.LimeGreen);
}
}

[koganam]

OK...wondering what I'm doing wrong at this point. I can get the code to compile, however, there is nothing drawn on the chart when I apply the indicator. I've pasted the code below.

Help...please!

protected override void Initialize()
{
Overlay = true;
}

/// <summary>
/// Called on each bar update event (incoming tick)
/// </summary>
protected override void OnBarUpdate()
{
// Use this method for calculating your indicator values. Assign a value to each
// plot below by replacing 'Close[0]' with your own formula.

if(Close[1] <= EMA(8)[1] && Close[0] > EMA(8)[0])
{
DrawArrowUp(CurrentBar.ToString(), true, 0, High[0] + TickSize, Color.LimeGreen);
}
}

Look in your log and you should see an error about an index being out of bounds or invalid.

You need to escape your first bar, as it does not exist when the code first runs. Try the suggestion in this thread (and numerous others in the forum).

ref: http://www.ninjatrader.com/support/f...41212#poststop

Generally speaking, the log should be your first place to look when an indicator compiles properly but does not draw on the chart as expected. There will usually be some indication of the cause in there.