fly/fgdata
1
0
Fork 0
Code Activity

add class for variable inverval lowpass filtering of angles. (If there's

Browse source 
a better method or name for it, please tell me.) This is primarily for
smoothing view heading angles.
This commit is contained in:
mfranz 2007-07-06 20:31:14 +00:00
parent bece57dfc8
commit d6ff854aa5
1 changed files with 34 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

35
Nasal/aircraft.nas
View file

@ -41,6 +41,13 @@
#
#
# constants
# ==============================================================================
var D2R = math.pi / 180;
var R2D = 180 / math.pi;
# helper functions
# ==============================================================================
@ -322,8 +329,34 @@ var lowpass = {
};
# angular lowpass
# ==============================================================================
# same as above, but for angles. Filters sin/cos separately and calculates the
# angle again from them. This avoids unexpected jumps from 180 to -179.99 degree.
#
var angular_lowpass = {
new : func(coeff) {
var m = { parents : [angular_lowpass] };
m.sin = aircraft.lowpass.new(coeff);
m.cos = aircraft.lowpass.new(coeff);
return m;
},
filter : func(v) {
v *= D2R;
math.atan2(me.sin.filter(math.sin(v)), me.cos.filter(math.cos(v))) * R2D;
},
set : func(v) {
v *= D2R;
me.sin.set(math.sin(v));
me.cos.set(math.cos(v));
},
get : func {
math.atan2(me.sin.get(), me.cos.get()) * R2D;
},
};
# Data
# data
# ==============================================================================
# class that loads and saves properties to aircraft-specific data files in
# ~/.fgfs/aircraft-data/ (Unix) or %APPDATA%\flightgear.org\aircraft-data\.