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peak trace: fix for log scale

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This commit is contained in:
Erik Bročko
2026-03-25 22:23:29 +01:00
parent d139ad517e
commit 2e91ed8570
1 changed files with 7 additions and 5 deletions
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12
src/ui/Measurements.cpp
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@@ -191,12 +191,14 @@ void Measurements::drawWaterfall(const SpectrumDisplay& specDisplay,
int count = std::min(screenRows, peakHistLen_); int count = std::min(screenRows, peakHistLen_);
ImU32 traceCol = IM_COL32(255, 30, 30, 200); ImU32 traceCol = IM_COL32(255, 30, 30, 200);
// Convert bin index to screen X via normalized frequency fraction // Convert bin index to screen X (respects log scale)
double fMin = isIQ ? -sampleRate / 2.0 : 0.0;
double fMax = isIQ ? sampleRate / 2.0 : sampleRate / 2.0;
auto binToX = [&](int bin) -> float { auto binToX = [&](int bin) -> float {
float frac = (static_cast<float>(bin) + 0.5f) / spectrumSize; double freq = fMin + (static_cast<double>(bin) + 0.5) / spectrumSize * (fMax - fMin);
// Map through view range return specDisplay.freqToScreenX(freq, posX, sizeX,
float viewFrac = (frac - viewLo) / (viewHi - viewLo); sampleRate, isIQ, freqScale,
return posX + viewFrac * sizeX; viewLo, viewHi);
}; };
// Walk from newest (bottom) to oldest (top) // Walk from newest (bottom) to oldest (top)