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improved formatting and positioning of cursor labels

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This commit is contained in:
Erik Bročko
2026-03-25 21:32:29 +01:00
parent c9b6b8d83d
commit a1b769336e
3 changed files with 38 additions and 55 deletions
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41
src/ui/Application.cpp
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@@ -478,48 +478,21 @@ void Application::render() {
double binCenterFreq = fMin + (static_cast<double>(cursors_.hover.bin) + 0.5)
/ bins * (fMax - fMin);
// Fixed-width frequency string to prevent jumping
char freqBuf[48];
if (std::abs(binCenterFreq) >= 1e6)
std::snprintf(freqBuf, sizeof(freqBuf), "%12.6f MHz", binCenterFreq / 1e6);
else if (std::abs(binCenterFreq) >= 1e3)
std::snprintf(freqBuf, sizeof(freqBuf), "%9.3f kHz", binCenterFreq / 1e3);
else
std::snprintf(freqBuf, sizeof(freqBuf), "%7.1f Hz", binCenterFreq);
char valBuf[48];
char hoverBuf[128];
if (hoverPanel_ == HoverPanel::Spectrum) {
std::snprintf(valBuf, sizeof(valBuf), "%7.1f dB", cursors_.hover.dB);
fmtFreqDB(hoverBuf, sizeof(hoverBuf), "", binCenterFreq, cursors_.hover.dB);
} else if (hoverPanel_ == HoverPanel::Waterfall) {
if (hoverWfTimeOffset_ >= 10.0f)
std::snprintf(valBuf, sizeof(valBuf), "%7.1f s", -hoverWfTimeOffset_);
else if (hoverWfTimeOffset_ >= 1.0f)
std::snprintf(valBuf, sizeof(valBuf), "%7.2f s", -hoverWfTimeOffset_);
else
std::snprintf(valBuf, sizeof(valBuf), "%5.0f ms", -hoverWfTimeOffset_ * 1000.0f);
fmtFreqTime(hoverBuf, sizeof(hoverBuf), "", binCenterFreq, -hoverWfTimeOffset_);
} else {
valBuf[0] = '\0';
fmtFreq(hoverBuf, sizeof(hoverBuf), binCenterFreq);
}
// Draw as a single right-aligned line, fixed-width value column
// Right-align the text
ImU32 hoverTextCol = IM_COL32(100, 230, 130, 240);
float rightEdge = specPosX_ + specSizeX_ - 8;
float hy2 = specPosY_ + 4;
// Use a fixed-width reference for the value column to prevent jumping
ImVec2 refSz = ImGui::CalcTextSize("-000.0 dB");
ImVec2 freqSz = ImGui::CalcTextSize(freqBuf);
float sepW = ImGui::CalcTextSize(" ").x;
float valColX = rightEdge - refSz.x;
float freqX = valColX - sepW - freqSz.x;
if (valBuf[0]) {
ImVec2 valSz = ImGui::CalcTextSize(valBuf);
dlp->AddText({freqX, hy2}, hoverTextCol, freqBuf);
dlp->AddText({rightEdge - valSz.x, hy2}, hoverTextCol, valBuf);
} else {
dlp->AddText({rightEdge - freqSz.x, hy2}, hoverTextCol, freqBuf);
}
ImVec2 hSz = ImGui::CalcTextSize(hoverBuf);
dlp->AddText({rightEdge - hSz.x, hy2}, hoverTextCol, hoverBuf);
}
}
}