8 VUMeter::VUMeter(QWidget *parent)
13 void VUMeter::resizeEvent(QResizeEvent *event)
15 recalculate_pixmaps();
18 void VUMeter::paintEvent(QPaintEvent *event)
20 QPainter painter(this);
22 float level_lufs[2], peak_lufs[2];
24 unique_lock<mutex> lock(level_mutex);
25 level_lufs[0] = this->level_lufs[0];
26 level_lufs[1] = this->level_lufs[1];
27 peak_lufs[0] = this->peak_lufs[0];
28 peak_lufs[1] = this->peak_lufs[1];
31 int mid = width() / 2;
33 for (unsigned channel = 0; channel < 2; ++channel) {
34 int left = (channel == 0) ? 0 : mid;
35 int right = (channel == 0) ? mid : width();
36 float level_lu = level_lufs[channel] - ref_level_lufs;
37 int on_pos = lrint(lufs_to_pos(level_lu, height()));
40 QRect on_rect(left, 0, right - left, height() - on_pos);
41 QRect off_rect(left, height() - on_pos, right - left, height());
43 painter.drawPixmap(on_rect, on_pixmap, on_rect);
44 painter.drawPixmap(off_rect, off_pixmap, off_rect);
46 QRect off_rect(left, 0, right - left, on_pos);
47 QRect on_rect(left, on_pos, right - left, height() - on_pos);
49 painter.drawPixmap(off_rect, off_pixmap, off_rect);
50 painter.drawPixmap(on_rect, on_pixmap, on_rect);
53 float peak_lu = peak_lufs[channel] - ref_level_lufs;
54 if (peak_lu >= min_level && peak_lu <= max_level) {
55 int peak_pos = lrint(lufs_to_pos(peak_lu, height()));
56 QRect peak_rect(left, peak_pos - 1, right, 2);
57 painter.drawPixmap(peak_rect, full_on_pixmap, peak_rect);
62 void VUMeter::recalculate_pixmaps()
64 full_on_pixmap = QPixmap(width(), height());
65 QPainter full_on_painter(&full_on_pixmap);
66 draw_vu_meter(full_on_painter, width(), height(), 0, 0.0, true, min_level, max_level, flip);
68 on_pixmap = QPixmap(width(), height());
69 QPainter on_painter(&on_pixmap);
70 draw_vu_meter(on_painter, width(), height(), 0, 2.0, true, min_level, max_level, flip);
72 off_pixmap = QPixmap(width(), height());
73 QPainter off_painter(&off_pixmap);
74 draw_vu_meter(off_painter, width(), height(), 0, 2.0, false, min_level, max_level, flip);