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fly-by: more variation of view points in air, with some limits on ground to

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avoid irritating taxiing through the viewer or down view on the aircraft
This commit is contained in:
mfranz 2007-07-16 14:42:48 +00:00
parent bd9a8f5fca
commit 886af1b68d
1 changed files with 33 additions and 9 deletions
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42
Nasal/view.nas
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@ -151,33 +151,57 @@ var flyby = {
me.currview == me.number or return;
me.chase = -getprop("/sim/chase-distance-m");
me.course = me.hdgN.getValue();
me.coord = geo.aircraft_position();
me.last = geo.aircraft_position();
me.setpos(1);
me.dist = 20;
me._loop_(me.loopid);
},
setpos : func(force = 0) {
var pos = geo.aircraft_position();
var dist = me.coord.distance_to(pos);
# check if the aircraft has moved enough
var dist = me.last.distance_to(pos);
if (dist < 1.7 * me.chase and !force)
return 1.13;
var side = (rand() - 0.5 < 0) ? -90 : 90;
# "predict" and remember next aircraft position
var course = me.hdgN.getValue();
var delta_alt = (pos.alt() - me.last.alt()) * 0.5;
pos.apply_course_distance(course, dist * 0.8);
pos.apply_course_distance(course + side, me.chase);
pos.set_alt(pos.alt() + delta_alt);
me.last.set(pos);
# apply random deviation
var radius = me.chase * (0.5 * rand() + 0.7);
var agl = getprop("/position/altitude-agl-ft") * geo.FT2M;
if (agl > me.chase)
var angle = rand() * 2 * math.pi;
else
var angle = ((2 * rand() - 1) * 0.15 + 0.5) * (rand() < 0.5 ? -math.pi : math.pi);
var dev_alt = math.cos(angle) * radius;
var dev_side = math.sin(angle) * radius;
pos.apply_course_distance(course + 90, dev_side);
# and make sure it's not under ground
var lat = pos.lat();
var lon = pos.lon();
var elev = geo.elevation(lat, lon);
var alt = pos.alt();
alt += (alt - me.coord.alt()) * 0.5;
if (elev != nil and alt < elev + 5)
alt = elev + 5;
var elev = geo.elevation(lat, lon);
if (elev != nil) {
elev += 2; # min elevation
if (alt + dev_alt < elev and dev_alt < 0)
dev_alt = -dev_alt;
if (alt + dev_alt < elev)
alt = elev;
else
alt += dev_alt;
}
# set new view point
me.latN.setValue(lat);
me.lonN.setValue(lon);
me.altN.setValue(alt * geo.M2FT);
me.coord.set_latlon(lat, lon, alt);
return 6.3;
},
_loop_ : func(id) {