I am new to this forum and the JForex Platform and the JAVA language.
I have an indicator written in EasyLanguage from Tradestation,
and was wondering if you could translate it into JAVA to work in JForex?

Start here:
https://www.dukascopy.com/wiki/#Create_a_strategy
https://www.dukascopy.com/wiki/#Strategy_API

Thanks for the links. I have been looking at the ZigZag indicator code
built into the JForex platform and was wondering if it were possible
to be able to change how the swings are defined. Instead of the
"ExtDepth", "ExtDeviation", and "ExtBackstep", I want to be able to
specify the size of each swinglength by a user-defined
percentage input. For example, when looking at a chart with
the ZigZag indicator on it, I want to know that each swing
shown is at least 0.5 percent big. Is this possible to do?

Yes, find the ZigZag source code here:
https://www.dukascopy.com/wiki/#Platform_indicator_source_files
And instructions for indicator development here:
https://www.dukascopy.com/wiki/#Indicator_API:_Overview

I downloaded NetBeans and found the indicator code for ZigZag. (It wasn't easy.) I am unable
to edit the code. (It is all grayed out). Is there something I'm missing? Is there any way you could
give me an idea of where to begin on this code. All the other trading software platforms
I'm used to code the zigzag indicator by percent change. Is there any way you could write the
code and have that as a default option in JForex? I've spent many hours this weekend and
haven't gotten anywhere.

Yes, you have to copy it and paste it in your source code package in order to modify it. Also mind to change the indicator name, as you can't register a custom indicator with the same name as the platform indicator.

Do I have to create a new project? If so, which kind. I'm getting "no main class" found errors.
Java application under JAVA or MAVEN?

See if this tutorial helps you (instead of IStrategy you need IInidicator, but the idea remains the same):
https://www.dukascopy.com/wiki/#Use_in_NetBeans/Create_a_Strategy_in_NetBeans

I tried following this. I'm about ready to give up. Is there no easier way?
I get a new project opened, I copy and paste the ZigZag Indicator code
in there, then try to run it and it won't even run without a long list of errors.
And I didn't even attempt changing the code yet!

Please attach the printscreens and error messages that you receive, such that we can assist you on this.

I can get this far OK. What do I do next?

Hi dcaliano:

Try with the image sequence i attach below

1 - find source file of zigzag indicator on netbeans, right click and copy
2 - find the package where you want to place the the copied file, righ click on it and paste -> refactor copy
3 - change the name of the indicator to allow to initialize it on other code you want to use the modified indicator
4 - voilá, you have all source code of the indicator working

Hope that helps

Trade well

JL

Thanks jlongo for the clear steps. I followed that. When I right click the
new MyTestZigZagIndicator.java, the "run file" is grayed out. Should I be
able to run the file? There are some lightbulbs on some lines.

You would need to add the main procedure to to this, but normally this is not what you want to do with the indicator. Use it as a custom indicator in the platform, see:
https://www.dukascopy.com/wiki/#Create_an_indicator

Oh. I see. Thanks API Support.

 private double extRetracePct = 0.25;

optInputParameterInfos = new OptInputParameterInfo[] {
            new OptInputParameterInfo("extRetracePct", OptInputParameterInfo.Type.PERCENT, new DoubleRangeDescription(extRetracePct, 0.25, 3.5, 0.05))      
        };

This returns "cannot be resolved to a type".

Am I on the right track? How would I define the range boundaries?

Use OptInputParameterInfo.Type.OTHER.

Okay. Thanks.

optInputParameterInfos = new OptInputParameterInfo[] {
            new OptInputParameterInfo("extRetracePct", OptInputParameterInfo.Type.OTHER, new DoubleRangeDescription(extRetracePct, 0.25, 3.5, 0.05))      
        };

Here's what I get when trying to compile after doing this:

"The constructor DoubleRangeDescription(double, double, double, double) is undefined.

You are missing an argument - see:
https://www.dukascopy.com/client/javadoc/com/dukascopy/api/indicators/DoubleRangeDescription.html#DoubleRangeDescription(double,%20double,%20double,%20double,%20int)

Yes. Now I see. Thanks.