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plotview: Hook up zoomLevel & fix up scrolling

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Mike Walters
2016-03-03 01:40:50 +00:00
parent 8cfd3aa97b
commit af7fb31eeb
4 changed files with 14 additions and 3 deletions
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12
plotview.cpp
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@@ -112,6 +112,15 @@ void PlotView::setFFTSize(int size)
{
fftSize = size;
spectrogramPlot->setFFTSize(size);
horizontalScrollBar()->setSingleStep(size * pow(2, zoomLevel));
horizontalScrollBar()->setPageStep(size * pow(2, zoomLevel) * 10);
viewport()->update();
}
void PlotView::setZoomLevel(int zoom)
{
zoomLevel = zoom;
spectrogramPlot->setZoomLevel(zoom);
viewport()->update();
}
@@ -119,8 +128,7 @@ void PlotView::paintEvent(QPaintEvent *event)
{
if (mainSampleSource == nullptr) return;
off_t firstSample = horizontalScrollBar()->value();
// TODO: don't hardcode width
off_t lastSample = firstSample + fftSize * width();
off_t lastSample = firstSample + fftSize * width() / pow(2, zoomLevel);
QRect rect = QRect(0, 0, width(), height());
QPainter painter(viewport());