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Writing Joystick Code: Part 3: Difference between revisions
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== Special snippets == | == Special snippets == | ||
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=== perIndexAxisHandler === | |||
This only works with ''real'' axes. | |||
You have a quadrant with 3 levers. Normally they are assigned to controls.throttleAxis(), controls.PropellerAxis() and controls.mixtureAxis(). | |||
Now let's say you are flying an aircraft with 2 propeller-engines, it has mixture control, but not propeller-feathering (or you are prepared to use buttons for this). | |||
Now you want the first 2 levers to control the throttles of each engine independently,and the last to do the mixture of both. In this case you would | |||
leave lever 3 assigned to controls.mixtureAxis(), but would use perIndexAxisHandler for the first 2. | |||
It works like this: controls.perIndexAxisHandler(function, engine-number). | |||
The values for function are | |||
0 Throttle | |||
1 Mixture | |||
2 Propeller | |||
Engine-number goes from 0 to 9. | |||
So in our example, lever 1 would be assigned | |||
controls.perIndexAxisHandler(0,0) | |||
and lever 2 | |||
controls.perIndexAxisHandler(0,1) | |||
See [http://flightgear.org/forums/viewtopic.php?f=24&t=17851 this post] for an example of using this. | |||
You can assign a n axis to more than one engine. Let's say you have 4 engines. You only have 3 levers on the quadrant. You want the | |||
first lever to do the port-outer engine throttle , lever 3 to do the starboard-outer engine throttle, and the middle lever to do the two inboard engine throttles. | |||
So you need to assign the middle lever a list of engines. | |||
Remembering that engines are numbered from 0 upwards for furthest left towards the right, the lever assignments from left to right are | |||
controls.perIndexAxisHandler(0,0) | |||
controls.perIndexAxisHandler(0,[1, 2]) | |||
controls.perIndexAxisHandler(0,3) | |||
Notice the list of engine numbers between [ and ] for the middle lever. | |||
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