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Fix nan/inf values for Virtual Speed.

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This commit is contained in:
Mark Liversedge
2011-12-21 18:56:39 +00:00
parent b06d1e9a1d
commit 265e310a9c
1 changed files with 10 additions and 3 deletions
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13
src/TrainTool.cpp
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@@ -48,6 +48,8 @@
#include <CoreServices/CoreServices.h>
#endif
#include <math.h> // isnan and isinf
TrainTool::TrainTool(MainWindow *parent, const QDir &home) : GcWindow(parent), home(home), main(parent)
{
setInstanceName("Train Controls");
@@ -939,7 +941,7 @@ void TrainTool::guiUpdate() // refreshes the telemetry
// algorithm supplied by Tom Compton
// from www.AnalyticCycling.com
// 3.6 * ... converts from meters per second to kph
rtData.setVirtualSpeed(3.6f * (
double vs = 3.6f * (
(-2*pow(2,0.3333333333333333)*(crr*m + g*m*sl)) /
pow(54*pow(ad,2)*pow(cdA,2)*pw +
sqrt(2916*pow(ad,4)*pow(cdA,4)*pow(pw,2) +
@@ -949,8 +951,13 @@ void TrainTool::guiUpdate() // refreshes the telemetry
sqrt(2916*pow(ad,4)*pow(cdA,4)*pow(pw,2) +
864*pow(ad,3)*pow(cdA,3)*pow(crr*m +
g*m*sl,3)),0.3333333333333333)/
(3.*pow(2,0.3333333333333333)*ad*cdA))
);
(3.*pow(2,0.3333333333333333)*ad*cdA));
// just in case...
if (isnan(vs) || isinf(vs)) vs = 0.00f;
rtData.setVirtualSpeed(vs);
// go update the displays...
main->notifyTelemetryUpdate(rtData); // signal everyone to update telemetry