[Flightgear-devel] Nasal question

[Josh Babcock]

Is there a way to assign an instantaneous joystick button, but not have 
the value jump directly from one value to another?  Currently I have the 
following code in my joystick file but it results in the brakes snapping 
on and off.  I wanted to get a smoother transition to be more realistic 
in ground handling (I know it won't make a big difference, but I want to 
try it) and also so that when I animate brake pedals they don't just 
snap back and forth.  I tried propertySlew() but it seems that the value 
wasn't going to the numbers I supplied, but only slewing for a very 
short period of time taht wasn't even consistant.  I played around with 
stepProp but I couldn't set the /sim/brakes properties from inside the 
joystick config file, so I gave up on that.  I think I need some 
clarification on how these are supposed to work before I can figure out 
how to do this.

Thanks,
Josh
What I have now:

<button n="1">
<desc>Left Brake</desc>
<repeatable type="bool">false</repeatable>
<binding>
 <command>property-assign</command>
 <property>/controls/gear/brake-left</property>
 <value type="double">1.0</value>
</binding>
<mod-up>
 <binding>
  <command>property-assign</command>
  <property>/controls/gear/brake-left</property>
  <value type="double">0.0</value>
 </binding>
</mod-up>
</button>
What didn't work:

<button n="1">
<desc>Left Brake</desc>
<repeatable type="bool">false</repeatable>
<binding>
 <command>nasal</command>
 <script>controls.slewProp("/controls/gear/brake-left", 1)</script>
</binding>
<mod-up>
 <binding>
  <command>nasal</command>
  <script>controls.slewProp("/controls/gear/brake-left", -1)</script>
 </binding>
</mod-up>
</button>


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