91 lines
2.3 KiB
Text
91 lines
2.3 KiB
Text
# Properties under /consumables/fuel/tank[n]:
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# + level-lbs - Current fuel load. Can be set by user code.
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# + selected - boolean indicating tank selection.
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# + capacity-gal_us - Tank capacity
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#
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# Properties under /engines/engine[n]:
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# + fuel-consumed-lbs - Output from the FDM, zeroed by this script
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# + out-of-fuel - boolean, set by this code.
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var UPDATE_PERIOD = 0.3;
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var update = func {
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if (fuel_freeze)
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return;
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var consumed_fuel = 0;
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foreach (var e; engines) {
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var fuel = e.getNode("fuel-consumed-lbs");
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consumed_fuel += fuel.getValue();
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fuel.setDoubleValue(0);
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}
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if (!consumed_fuel)
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return;
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var selected_tanks = [];
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foreach (var t; tanks) {
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var cap = t.getNode("capacity-gal_us",0).getValue();
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if (cap > 0.01 and t.getNode("selected").getBoolValue())
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append(selected_tanks, t);
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}
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# Subtract fuel from tanks, set auxilliary properties. Set out-of-fuel
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# when any one tank is dry.
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var out_of_fuel = 0;
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if (size(selected_tanks) == 0) {
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out_of_fuel = 1;
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} else {
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var fuel_per_tank = consumed_fuel / size(selected_tanks);
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foreach (var t; selected_tanks) {
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var lbs = t.getNode("level-lbs").getValue();
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lbs = lbs - fuel_per_tank;
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t.getNode("level-lbs").setDoubleValue(lbs);
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if( t.getNode("empty").getBoolValue() ) {
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# Kill the engines if we're told to, otherwise simply
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# deselect the tank.
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if (t.getNode("kill-when-empty", 1).getBoolValue())
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out_of_fuel = 1;
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else
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t.getNode("selected").setBoolValue(0);
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}
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}
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}
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foreach (var e; engines)
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e.getNode("out-of-fuel").setBoolValue(out_of_fuel);
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}
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var loop = func {
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update();
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settimer(loop, UPDATE_PERIOD);
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}
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var tanks = [];
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var engines = [];
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var fuel_freeze = nil;
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_setlistener("/sim/signals/fdm-initialized", func {
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setlistener("/sim/freeze/fuel", func(n) { fuel_freeze = n.getBoolValue() }, 1);
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engines = props.globals.getNode("engines", 1).getChildren("engine");
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foreach (var e; engines) {
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e.getNode("fuel-consumed-lbs", 1).setDoubleValue(0);
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e.getNode("out-of-fuel", 1).setBoolValue(0);
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}
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foreach (var t; props.globals.getNode("/consumables/fuel", 1).getChildren("tank")) {
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if (!t.getAttribute("children"))
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continue; # skip native_fdm.cxx generated zombie tanks
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append(tanks, t);
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t.initNode("selected", 1, "BOOL");
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}
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loop();
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});
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