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Change slewed gauge display to low-pass filtered gauge display. #1315

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Change slewed gauge display to low-pass filtered gauge display. #1315

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6 changes: 5 additions & 1 deletion Orbitersdk/samples/ProjectApollo/src_sys/toggleswitch.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3817,7 +3817,11 @@ double MeterSwitch::GetDisplayValue() {
double dt = oapiGetSimTime() - lastDrawTime; // oapiGetSimTime() - lastDrawTime;
if (dt > 0) {
if (fabs(value - displayValue) / dt > (maxValue - minValue) / minMaxTime) {
displayValue += ((value - displayValue) / fabs(value - displayValue)) * (maxValue - minValue) / minMaxTime * dt;
// discrete time LPF where y[n] = y[n-1]*(1-a) + x[n]*a
// assumed that 5tau is minMaxTime, i.e. time to reach 99.3% of a step input.
// therefore 1/tau is (5/minMaxTime) for each slice {dt}.
double filtConstant = max(min(GAUGE_LPF_SCALAR * dt * 5.0/minMaxTime, 1.0),0.0);
displayValue = displayValue*(1-filtConstant) + (value*filtConstant);
} else {
displayValue = value;
}
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3 changes: 3 additions & 0 deletions Orbitersdk/samples/ProjectApollo/src_sys/toggleswitch.h
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Expand Up @@ -74,6 +74,9 @@
#define TIME_UPDATE_MINUTES 1
#define TIME_UPDATE_HOURS 2

// Lowpass filter for gauges assumes 5tau ~~ minMaxTime. All 5tau components can be globally scaled by GAUGE_LPF_SCALAR if relationship does not hold well. (higher->faster)
#define GAUGE_LPF_SCALAR 1.0

class SwitchRow;
class PanelSwitchScenarioHandler;
class PanelSwitchCallbackInterface;
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