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fix: dynamic frequency labels and fix frequency clamping crash

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- Frequency tick/label intervals now adapt to zoom level instead of
  always showing 0–Nyquist (5Hz → 10kHz depending on zoom)
- Labels use coarser spacing than ticks to avoid clutter
- Fix segfault when zooming out past signal bounds by properly clamping
  freqViewStart/freqViewEnd to [0,1] with correct width preservation
  in zoom, pan, and scrollbar drag
- Fix firstTick calculation that was off-by-one
This commit is contained in:
Tyler
2026-05-24 22:14:17 -07:00
parent 1cbba956b8
commit 78cd21c957
1 changed files with 62 additions and 20 deletions
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src/spectrogram.c
+62 -20
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@@ -1123,27 +1123,50 @@ static void DrawLabels(Rectangle bounds)
DrawTextScaled(label, x, bounds.y + bounds.height + 5, baseFontSize, textColor);
}
// Frequency labels at 1kHz intervals with 200Hz ticks
// Frequency labels adapted to current zoom level
float maxFreq = (float)app.signal.sampleRate / 2.0f;
int maxKhz = (int)(maxFreq / 1000.0f);
float freqMin = app.freqViewStart * maxFreq;
float freqMax = app.freqViewEnd * maxFreq;
for (int hz = 0; hz <= maxFreq; hz += 200) {
float t = hz / maxFreq;
// Choose tick spacing based on zoom range
float freqRange = freqMax - freqMin;
int tickSpacing;
if (freqRange < 20) tickSpacing = 5;
else if (freqRange < 50) tickSpacing = 10;
else if (freqRange < 200) tickSpacing = 50;
else if (freqRange < 1000) tickSpacing = 100;
else if (freqRange < 5000) tickSpacing = 200;
else if (freqRange < 20000) tickSpacing = 1000;
else if (freqRange < 50000) tickSpacing = 5000;
else tickSpacing = 10000;
// Labels use next coarser spacing so they stay readable
int labelSpacing = tickSpacing;
if (labelSpacing <= 10) labelSpacing = 10;
else if (labelSpacing <= 50) labelSpacing = 50;
else if (labelSpacing <= 200) labelSpacing = 200;
else if (labelSpacing <= 1000) labelSpacing = 1000;
else if (labelSpacing <= 5000) labelSpacing = 5000;
else labelSpacing = 10000;
// Round freqMin up to nearest tick spacing (smallest multiple >= freqMin)
int firstTick = ((int)(freqMin / tickSpacing)) * tickSpacing;
if (firstTick < freqMin) firstTick += tickSpacing;
for (int hz = firstTick; hz <= freqMax; hz += tickSpacing) {
float t = (hz - freqMin) / freqRange;
float y = bounds.y + bounds.height - t * bounds.height;
Color tickColor = (hz % 1000 == 0) ? GRAY : Fade(GRAY, 0.4f);
DrawLineV((Vector2){ bounds.x - 5, y }, (Vector2){ bounds.x, y }, tickColor);
}
for (int khz = 0; khz <= maxKhz; khz++) {
float freq = khz * 1000.0f;
if (freq > maxFreq) break;
float t = freq / maxFreq;
// Draw labels at the coarser spacing
for (int hz = firstTick; hz <= freqMax; hz += labelSpacing) {
float t = (hz - freqMin) / freqRange;
float y = bounds.y + bounds.height - t * bounds.height;
char label[32];
if (khz == 0) sprintf(label, "0");
else if (khz < 10) sprintf(label, "%dk", khz);
else sprintf(label, "%d", khz);
DrawTextScaled(label, bounds.x - 15, y - 5, baseFontSize, textColor);
if (hz < 10000) sprintf(label, "%.0fHz", (float)hz);
else sprintf(label, "%.0fkHz", (float)hz / 1000.0f);
DrawTextScaled(label, bounds.x - 70, y - 5, baseFontSize, textColor);
}
}
@@ -1693,14 +1716,14 @@ int main(int argc, char* argv[])
mouseF = app.freqViewStart + mouseF * (app.freqViewEnd - app.freqViewStart);
float freqWidth = app.freqViewEnd - app.freqViewStart;
float newFreqWidth = freqWidth * zoomFactor;
if (newFreqWidth < 0.02f) newFreqWidth = 0.02f;
if (newFreqWidth > 1.0f) newFreqWidth = 1.0f;
if (newFreqWidth < 0.001f) newFreqWidth = 0.001f;
float belowMouse = mouseF - app.freqViewStart;
float aboveMouse = app.freqViewEnd - mouseF;
app.freqViewStart = mouseF - belowMouse * (newFreqWidth / freqWidth);
app.freqViewEnd = mouseF + aboveMouse * (newFreqWidth / freqWidth);
if (app.freqViewStart < 0) { app.freqViewStart = 0; app.freqViewEnd = newFreqWidth; }
if (app.freqViewEnd > 1) { app.freqViewEnd = 1; app.freqViewStart = 1 - newFreqWidth; }
// Clamp to physical frequency limits [0, 1] — can't see beyond Nyquist or below 0 Hz
if (app.freqViewStart < 0) { app.freqViewStart = 0; app.freqViewEnd = fminf(app.freqViewEnd, 1.0f); }
if (app.freqViewEnd > 1) { app.freqViewEnd = 1; app.freqViewStart = fmaxf(app.freqViewStart, 0.0f); }
// Invalidate texture cache
app.visibleTextureValid = false;
@@ -1728,8 +1751,19 @@ int main(int argc, char* argv[])
if (app.viewEnd > 1) { app.viewEnd = 1; app.viewStart = 1 - viewWidth; }
app.freqViewStart = app.panStartFreqViewStart + dy * freqWidth;
app.freqViewEnd = app.panStartFreqViewEnd + dy * freqWidth;
if (app.freqViewStart < 0) { app.freqViewStart = 0; app.freqViewEnd = freqWidth; }
if (app.freqViewEnd > 1) { app.freqViewEnd = 1; app.freqViewStart = 1 - freqWidth; }
// Clamp to physical limits [0, 1]
if (app.freqViewStart < 0) {
float actualWidth = app.freqViewEnd - app.freqViewStart;
app.freqViewStart = 0;
app.freqViewEnd = fminf(actualWidth, 1.0f);
}
if (app.freqViewEnd > 1) {
float actualWidth = app.freqViewEnd - app.freqViewStart;
app.freqViewEnd = 1;
app.freqViewStart = fmaxf(1.0f - actualWidth, 0.0f);
}
if (app.freqViewStart < 0) app.freqViewStart = 0;
if (app.freqViewEnd > 1) app.freqViewEnd = 1;
app.visibleTextureValid = false;
}
if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON)) app.isPanning = false;
@@ -2182,8 +2216,16 @@ int main(int argc, char* argv[])
float freqWidth = app.freqViewEnd - app.freqViewStart;
app.freqViewStart = dragStartFreqViewStart - dy;
app.freqViewEnd = app.freqViewStart + freqWidth;
if (app.freqViewStart < 0) { app.freqViewStart = 0; app.freqViewEnd = freqWidth; }
if (app.freqViewEnd > 1) { app.freqViewEnd = 1; app.freqViewStart = 1 - freqWidth; }
if (app.freqViewStart < 0) {
app.freqViewStart = 0;
app.freqViewEnd = fminf(freqWidth, 1.0f);
}
if (app.freqViewEnd > 1) {
app.freqViewEnd = 1;
app.freqViewStart = fmaxf(1.0f - freqWidth, 0.0f);
}
if (app.freqViewStart < 0) app.freqViewStart = 0;
if (app.freqViewEnd > 1) app.freqViewEnd = 1;
app.visibleTextureValid = false;
}
if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON)) { draggingH = false; draggingV = false; }