Bar Variables and Properties
You can setup Bar= references to a variable, and display that variables value in the properties panel of the scripting tool, allowing it to be modified via the panel, rather than needing to edit the script each time.
To setup a bar variable script functions such as MA() can reference you use the $ symbol.
$a = 50
This sets the bar variable to 50. This can then be referenced in other areas of the script (anywhere a function contains a Bar= property.
plot1 = MA(BARS=$a) ;
In this example the script would plot a 50SMA on the chart.
Bar Variables can be more than static numbers, they can be build from any script function, for example:
$b=ATR(BARS=100, MULT=1) ;
plot1 = MA(BARS=$b) ;
In this example b would be the value of an ATR and c would be the value of the Closing price + 100.
Bar Variables in Properties
When a bar variable has been setup in a script, you can add a property for this value to the tools properties panel. This is done using the # symbol.
#$a = 50
When looking at the properties of a tool containing this script, the value for a would be displayed and could be adjusted from the panel.
This setup allows you to modify parts of the script like you would a standard tool, without the need to edit the underlying script code.
Example script from above image:
#$MA1= 20 ;
#$MA2= 50 ;