fly/flightgear
1
0
Fork 0
Code Activity

move generation of lon/lat string representations here from cockpit.cxx.

Browse source 
Thanks to tied functions, this is only executed when the node is read. This
will be done by the old & new HUD code, the latter of which won't have a
special lon/lat mode at all. Instead it will be regular labels that point
to these properties for displaying lon/lat.
   I would have liked to avoid the duplication of code (lon and lat being
basically the same thing), and to avoid using static buffers and all, but
... if anyone wants to make it prettier, go ahead.
   The format is controlled by /sim/lon-lat-format (will be changed if I
find a better place).
This commit is contained in:
mfranz 2006-06-17 16:33:00 +00:00
parent 890fa81c7e
commit af0ad80b51
1 changed files with 71 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

71
src/Main/fg_props.cxx
View file

@ -433,6 +433,70 @@ setFDMDataLogging (bool state)
}
}
static const char *
getLongitudeString ()
{
static SGConstPropertyNode_ptr n = fgGetNode("/position/longitude-deg", true);
static SGConstPropertyNode_ptr f = fgGetNode("/sim/lon-lat-format", true);
static char buf[32];
double d = n->getDoubleValue();
int format = f->getIntValue();
if (format == 0) {
snprintf(buf, 32, "%3.6f", d);
} else if (format == 1) {
// dd mm.mmm' (DMM-Format) -- uses a round-off factor tailored to the
// required precision of the minutes field (three decimal places),
// preventing minute values of 60.
double deg = fabs(d) + 5.0E-4 / 60.0;
double min = fabs(deg - int(deg)) * 60.0 - 4.999E-4;
snprintf(buf, 32, "%d*%06.3f%c", int(d < 0.0 ? -deg : deg), min,
d < 0.0 ? 'W' : 'E');
} else {
// mm'ss.s'' (DMS-Format) -- uses a round-off factor tailored to the
// required precision of the seconds field (one decimal place),
// preventing second values of 60.
double deg = fabs(d) + 0.05 / 3600.0;
double min = (deg - int(deg)) * 60.0;
double sec = (min - int(min)) * 60.0 - 0.049;
snprintf(buf, 32, "%d*%02d %04.1f%c", int(d < 0.0 ? -deg : deg),
int(min), sec, d < 0.0 ? 'W' : 'E');
}
return buf;
}
static const char *
getLatitudeString ()
{
static SGConstPropertyNode_ptr n = fgGetNode("/position/latitude-deg", true);
static SGConstPropertyNode_ptr f = fgGetNode("/sim/lon-lat-format", true);
static char buf[32];
double d = n->getDoubleValue();
int format = f->getIntValue();
if (format == 0) {
snprintf(buf, 32, "%3.6f", d);
} else if (format == 1) {
double deg = fabs(d) + 5.0E-4 / 60.0;
double min = fabs(deg - int(deg)) * 60.0 - 4.999E-4;
snprintf(buf, 32, "%d*%06.3f%c", int(d < 0.0 ? -deg : deg), min,
d < 0.0 ? 'S' : 'N');
} else {
double deg = fabs(d) + 0.05 / 3600.0;
double min = (deg - int(deg)) * 60.0;
double sec = (min - int(min)) * 60.0 - 0.049;
snprintf(buf, 32, "%d*%02d %04.1f%c", int(d < 0.0 ? -deg : deg),
int(min), sec, d < 0.0 ? 'S' : 'N');
}
return buf;
}
////////////////////////////////////////////////////////////////////////
// Tie the properties.
@ -464,6 +528,10 @@ FGProperties::bind ()
fgSetArchivable("/sim/time/gmt");
fgTie("/sim/time/gmt-string", getGMTString);
// Position
fgTie("/position/latitude-string", getLatitudeString);
fgTie("/position/longitude-string", getLongitudeString);
// Orientation
fgTie("/orientation/heading-magnetic-deg", getHeadingMag);
@ -490,6 +558,9 @@ FGProperties::unbind ()
fgUntie("/sim/time/elapsed-sec");
fgUntie("/sim/time/gmt");
fgUntie("/sim/time/gmt-string");
// Position
fgUntie("/position/latitude-string");
fgUntie("/position/longitude-string");
// Orientation
fgUntie("/orientation/heading-magnetic-deg");