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Difference between revisions of "Writing Joystick Code: Part 4"

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(Created page with "{{WIP}} == Axis Numbering == Until now we have got our joysticks working in our system by defining each axis with the following format <axis n="0"> <desc>Aileron</des...")
 
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Any complaints/suggestions/questions/kudos can be posted [http://flightgear.org/forums/viewtopic.php?f=24&t=17892 here].
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[[Category:Hardware]]

Revision as of 22:54, 14 October 2012

WIP.png Work in progress
This article or section will be worked on in the upcoming hours or days.
See history for the latest developments.

Axis Numbering

Until now we have got our joysticks working in our system by defining each axis with the following format

 <axis n="0">
   <desc>Aileron</desc>
   <binding>
   ...
 </axis>


This fine if you are using the joystick on your system. But imagine that you have worked out a brilliant button assignment scheme, using modifiers, so that the joystick is a joy to use. You want to post your code in the forum so everyone can use it.

There's a problem though. Different operating systems assign different numbers to the axes. Let's say that with joystick, Windows says that the Aileron axis is number 0, and Macs and Linux say it is axis 2. We have to change our format of the axis definition to

 <axis>
   <win>0</win>
   <mac>2</mac>
   <unix>2</unix>
   <desc>Aileron</desc>
   <binding>
   ...
 </axis>


Now th joystick will work with all operating systems.


The reason we write <unix> is because Linux is a variant of Unix.


Unfortunately, there is no fixed relationship between axis numbering in the operating susyems, and the information must be garnered form experienece. Fortunately, the button numbering doesn't change.


Here is a list of axis numbers for various joysticks. The list will be expanded as and when I get the required information. If you have axis numbers for a joystick not listed, please post the information here.



 Logitech WingMan Extreme Digital 3D (USB)
 
 Ailerons   win 0   unix 0   mac 0
 Elevator   win 1   unix 1   mac 1
 Throttle   win 2   unix 3   mac 3   # Slider
 Rudder     win 3   unix 2   mac 2   # Twist
 Hat        win 6   unix 4   mac 4   # Left/right
 Hat        win 7   unix 5   mac 5   # Up/down






Go back to Writing Joystick Code: Part 3




Any complaints/suggestions/questions/kudos can be posted here.