#include <QPainter>
#include "vumeter.h"
+#include "vu_common.h"
using namespace std;
-namespace {
-
-int lufs_to_pos(float level_lu, int height)
+VUMeter::VUMeter(QWidget *parent)
+ : QWidget(parent)
{
- const float min_level = 9.0f; // y=0 is top of screen, so “min” is the loudest level.
- const float max_level = -18.0f;
-
- // Handle -inf.
- if (level_lu < max_level) {
- return height - 1;
- }
-
- int y = lrintf(height * (level_lu - min_level) / (max_level - min_level));
- y = std::max(y, 0);
- y = std::min(y, height - 1);
- return y;
}
-} // namespace
-
-VUMeter::VUMeter(QWidget *parent)
- : QWidget(parent)
+void VUMeter::resizeEvent(QResizeEvent *event)
{
+ recalculate_pixmaps();
}
void VUMeter::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
- painter.fillRect(0, 0, width(), height(), Qt::black);
-
- // Draw some reference bars.
- for (int level = -18; level < 9; ++level) {
- int min_y = lufs_to_pos(level, height()) - 1;
- int max_y = lufs_to_pos(level + 1.0f, height()) + 1;
-
- // Recommended range is 0 LU +/- 1 LU.
- if (level == -1 || level == 0) {
- painter.fillRect(1, min_y, width() - 2, max_y - min_y, Qt::green);
- } else {
- painter.fillRect(1, min_y, width() - 2, max_y - min_y, QColor(80, 80, 80));
- }
- }
-
float level_lufs;
{
unique_lock<mutex> lock(level_mutex);
level_lufs = this->level_lufs;
}
- float level_lu = level_lufs + 23.0f;
- int y = lufs_to_pos(level_lu, height());
- painter.fillRect(0, y, width(), 2, Qt::white);
+ float level_lu = level_lufs - ref_level_lufs;
+ int on_pos = lrint(lufs_to_pos(level_lu, height()));
+
+ if (flip) {
+ QRect on_rect(0, 0, width(), height() - on_pos);
+ QRect off_rect(0, height() - on_pos, width(), height());
+
+ painter.drawPixmap(on_rect, on_pixmap, on_rect);
+ painter.drawPixmap(off_rect, off_pixmap, off_rect);
+ } else {
+ QRect off_rect(0, 0, width(), on_pos);
+ QRect on_rect(0, on_pos, width(), height() - on_pos);
+
+ painter.drawPixmap(off_rect, off_pixmap, off_rect);
+ painter.drawPixmap(on_rect, on_pixmap, on_rect);
+ }
+}
+
+void VUMeter::recalculate_pixmaps()
+{
+ on_pixmap = QPixmap(width(), height());
+ QPainter on_painter(&on_pixmap);
+ draw_vu_meter(on_painter, width(), height(), 0, true, min_level, max_level, flip);
+
+ off_pixmap = QPixmap(width(), height());
+ QPainter off_painter(&off_pixmap);
+ draw_vu_meter(off_painter, width(), height(), 0, false, min_level, max_level, flip);
}