#include <Main/util.hxx>
+// A higher number means more responsive
+#define RESPONSIVENESS 10.0
+
+
// Altitude based on pressure difference from sea level.
// pressure difference inHG, altitude ft
static double altitude_data[][2] = {
};
-Altimeter::Altimeter ()
- : _altitude_table(new SGInterpTable)
+Altimeter::Altimeter ( SGPropertyNode *node )
+ : _name(node->getStringValue("name", "altimeter")),
+ _num(node->getIntValue("number", 0)),
+ _static_pressure(node->getStringValue("static-pressure", "/systems/static/pressure-inhg")),
+ _altitude_table(new SGInterpTable)
{
-
- for (int i = 0; altitude_data[i][0] != -1; i++)
+ int i;
+ for (i = 0; altitude_data[i][0] != -1; i++)
_altitude_table->addEntry(altitude_data[i][0], altitude_data[i][1]);
}
void
Altimeter::init ()
{
- _serviceable_node =
- fgGetNode("/instrumentation/altimeter/serviceable", true);
- _setting_node =
- fgGetNode("/instrumentation/altimeter/setting-inhg", true);
- _pressure_node =
- fgGetNode("/systems/static/pressure-inhg", true);
- _altitude_node =
- fgGetNode("/instrumentation/altimeter/indicated-altitude-ft", true);
-}
+ string branch;
+ branch = "/instrumentation/" + _name;
-void
-Altimeter::bind ()
-{
-}
+ SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
-void
-Altimeter::unbind ()
-{
+ _serviceable_node = node->getChild("serviceable", 0, true);
+ _setting_node = node->getChild("setting-inhg", 0, true);
+ _pressure_node = fgGetNode(_static_pressure.c_str(), true);
+ _altitude_node = node->getChild("indicated-altitude-ft", 0, true);
}
void
if (_serviceable_node->getBoolValue()) {
double pressure = _pressure_node->getDoubleValue();
double setting = _setting_node->getDoubleValue();
- double altitude =
- fgGetLowPass(_altitude_node->getDoubleValue(),
- _altitude_table->interpolate(setting - pressure),
- dt * 10);
- _altitude_node->setDoubleValue(altitude);
+
+ // Move towards the current setting
+ double last_altitude = _altitude_node->getDoubleValue();
+ double current_altitude =
+ _altitude_table->interpolate(setting - pressure);
+ _altitude_node->setDoubleValue(fgGetLowPass(last_altitude,
+ current_altitude,
+ dt * RESPONSIVENESS));
}
}