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add hover cursor

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This commit is contained in:
Erik Bročko
2026-03-25 20:30:29 +01:00
parent c4d45a2f83
commit 5aa316679c
2 changed files with 76 additions and 3 deletions
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72
src/ui/Application.cpp
View File

@@ -267,6 +267,8 @@ void Application::render() {
ImGui_ImplSDL2_NewFrame();
ImGui::NewFrame();
hoverPanel_ = HoverPanel::None;
// Full-screen layout
ImGuiViewport* viewport = ImGui::GetMainViewport();
ImGui::SetNextWindowPos(viewport->WorkPos);
@@ -453,8 +455,8 @@ void Application::render() {
settings_.isIQ, freqScale_, viewLo_, viewHi_);
ImU32 hoverCol = IM_COL32(200, 200, 200, 80);
// Line spanning waterfall + splitter + spectrum
dlp->AddLine({hx, wfPosY_}, {hx, specPosY_ + specSizeY_}, hoverCol, 1.0f);
// Line in spectrum area only
dlp->AddLine({hx, specPosY_}, {hx, specPosY_ + specSizeY_}, hoverCol, 1.0f);
// Frequency label at top of waterfall
char freqLabel[48];
@@ -472,6 +474,59 @@ void Application::render() {
dlp->AddRectFilled({lx - 2, ly - 1}, {lx + tSz.x + 2, ly + tSz.y + 1},
IM_COL32(0, 0, 0, 180));
dlp->AddText({lx, ly}, IM_COL32(220, 220, 240, 240), freqLabel);
// ── Hover info (right side of spectrum/waterfall) ──
{
// Use bin center for frequency
int bins = analyzer_.spectrumSize();
double fMin = settings_.isIQ ? -settings_.sampleRate / 2.0 : 0.0;
double fMax = settings_.isIQ ? settings_.sampleRate / 2.0 : settings_.sampleRate / 2.0;
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];
if (hoverPanel_ == HoverPanel::Spectrum) {
std::snprintf(valBuf, sizeof(valBuf), "%7.1f dB", 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);
} else {
valBuf[0] = '\0';
}
// Draw as a single right-aligned line, fixed-width value column
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);
}
}
}
}
ImGui::EndChild();
@@ -951,6 +1006,7 @@ void Application::renderWaterfallPanel() {
// Hover cursor from waterfall
if (inWaterfall) {
hoverPanel_ = HoverPanel::Waterfall;
double freq = specDisplay_.screenXToFreq(mx, pos.x, availW,
settings_.sampleRate,
settings_.isIQ, freqScale_,
@@ -961,6 +1017,13 @@ void Application::renderWaterfallPanel() {
int bin = static_cast<int>((freq - fMin) / (fMax - fMin) * (bins - 1));
bin = std::clamp(bin, 0, bins - 1);
// Time offset: bottom = newest (0s), top = oldest
float yFrac = 1.0f - (my - pos.y) / availH; // 0 at bottom, 1 at top
int hopSamples = static_cast<int>(settings_.fftSize * (1.0f - settings_.overlap));
if (hopSamples < 1) hopSamples = 1;
double secondsPerLine = static_cast<double>(hopSamples) / settings_.sampleRate;
hoverWfTimeOffset_ = static_cast<float>(yFrac * screenRows * secondsPerLine);
int curCh = std::clamp(waterfallChannel_, 0, analyzer_.numSpectra() - 1);
const auto& spec = analyzer_.channelSpectrum(curCh);
if (!spec.empty()) {
@@ -1022,6 +1085,7 @@ void Application::handleSpectrumInput(float posX, float posY,
my >= posY && my <= posY + sizeY;
if (inRegion) {
hoverPanel_ = HoverPanel::Spectrum;
// Update hover cursor
double freq = specDisplay_.screenXToFreq(mx, posX, sizeX,
settings_.sampleRate,
@@ -1106,8 +1170,12 @@ void Application::handleSpectrumInput(float posX, float posY,
}
}
} else {
// Only clear hover if waterfall didn't already set it this frame
if (hoverPanel_ != HoverPanel::Waterfall) {
hoverPanel_ = HoverPanel::None;
cursors_.hover.active = false;
}
}
}
void Application::openPortAudio() {

5
src/ui/Application.h
View File

@@ -179,6 +179,11 @@ private:
float specPosX_ = 0, specPosY_ = 0, specSizeX_ = 0, specSizeY_ = 0;
float wfPosX_ = 0, wfPosY_ = 0, wfSizeX_ = 0, wfSizeY_ = 0;
// Hover state: which panel is being hovered
enum class HoverPanel { None, Spectrum, Waterfall };
HoverPanel hoverPanel_ = HoverPanel::None;
float hoverWfTimeOffset_ = 0.0f; // seconds from newest line
// Config persistence
Config config_;