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Fix frequency comparison in aviation context

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This commit is contained in:
Lars Toenning
2023-10-29 17:47:49 +01:00
parent d48c3d2246
commit 979482282e
1 changed files with 20 additions and 8 deletions
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28
src/blackmisc/aviation/comsystem.cpp
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@@ -3,6 +3,7 @@
#include "blackmisc/aviation/comsystem.h"
#include "blackmisc/math/mathutils.h"
#include "blackmisc/pq/literals.h"
#include "blackmisc/stringutils.h"
#include <QDBusMetaType>
@@ -176,15 +177,26 @@ namespace BlackMisc::Aviation
bool CComSystem::isSameFrequency(const CFrequency &freq1, const CFrequency &freq2)
{
using namespace BlackMisc::PhysicalQuantities::Literals;
if (freq1.isNull() || freq2.isNull()) { return false; }
if (freq1 == freq2) { return true; } // shortcut for many of such comparisons
if (freq1.valueInteger(CFrequencyUnit::kHz()) == freq2.valueInteger(CFrequencyUnit::kHz())) { return true; }
// .x20 == .x25 and .x70 == .x75
const int freq1End = static_cast<int>(freq1.value(CFrequencyUnit::kHz())) % 100;
const int freq2End = static_cast<int>(freq2.value(CFrequencyUnit::kHz())) % 100;
if (freq1End != 20 && freq1End != 25 && freq1End != 70 && freq1End != 75) { return false; }
if (freq2End != 20 && freq2End != 25 && freq2End != 70 && freq2End != 75) { return false; }
return std::abs(freq1End - freq2End) == 5;
// Normalize .x20 => .x25 and .70 => .x75
auto normalize = [](CFrequency freq) {
const int freq_end = static_cast<int>(freq.value(CFrequencyUnit::kHz())) % 100;
if (freq_end == 20 || freq_end == 70)
{
freq += 5_kHz;
}
return freq;
};
CFrequency normalized_freq1 = normalize(freq1);
CFrequency normalized_freq2 = normalize(freq2);
if (normalized_freq1 == normalized_freq2) { return true; } // shortcut for many of such comparisons
// Avoid precision errors in Hz range
return normalized_freq1.valueInteger(CFrequencyUnit::kHz()) == normalized_freq2.valueInteger(CFrequencyUnit::kHz());
}
CFrequency CComSystem::parseComFrequency(const QString &input, CPqString::SeparatorMode sep)