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feat(spectrogramplot): Draw a time axis at the top

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This commit is contained in:
Tobias Schneider
2016-08-05 10:28:53 +01:00
parent fc9e575052
commit 549d6fa679
5 changed files with 65 additions and 1 deletions
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54
spectrogramplot.cpp
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@@ -52,6 +52,53 @@ void SpectrogramPlot::paintFront(QPainter &painter, QRect &rect, range_t<off_t>
{
if (tunerEnabled())
tuner.paintFront(painter, rect, sampleRange);
float startTime = (float)sampleRange.minimum / sampleRate;
float stopTime = (float)sampleRange.maximum / sampleRate;
float duration = stopTime - startTime;
painter.save();
QPen pen(Qt::white, 1, Qt::SolidLine);
painter.setPen(pen);
QFontMetrics fm(painter.font());
int tickWidth = 80;
int maxTicks = rect.width() / tickWidth;
double durationPerTick = 10 * pow(10, floor(log(duration / maxTicks) / log(10)));
double firstTick = int(startTime / durationPerTick) * durationPerTick;
double tick = firstTick;
while (tick <= stopTime) {
off_t tickSample = tick * sampleRate;
int tickLine = (tickSample - sampleRange.minimum) / getStride();
char buf[128];
snprintf(buf, sizeof(buf), "%.06f", tick);
painter.drawLine(tickLine, 0, tickLine, 30);
painter.drawText(tickLine + 2, 25, buf);
tick += durationPerTick;
}
// Draw small ticks
durationPerTick /= 10;
firstTick = int(startTime / durationPerTick) * durationPerTick;
tick = firstTick;
while (tick <= stopTime) {
off_t tickSample = tick * sampleRate;
int tickLine = (tickSample - sampleRange.minimum) / getStride();
painter.drawLine(tickLine, 0, tickLine, 10);
tick += durationPerTick;
}
painter.restore();
}
void SpectrogramPlot::paintMid(QPainter &painter, QRect &rect, range_t<off_t> sampleRange)
@@ -239,3 +286,10 @@ uint qHash(const TileCacheKey &key, uint seed)
{
return key.fftSize ^ key.zoomLevel ^ key.sample ^ seed;
}
void SpectrogramPlot::setSampleRate(off_t rate)
{
sampleRate = rate;
emit repaint();
}