Split VUMeter into a left and right side, so one can (optionally) have stereo meters.

[nageru] / vumeter.cpp

diff --git a/vumeter.cpp b/vumeter.cpp
index da93c1e380732535c18ee38d038e2c9996184fe0..50f0f143f7e575d03f8e0810130cad28da010424 100644 (file)
--- a/vumeter.cpp
+++ b/vumeter.cpp
@@ -10,32 +10,53 @@ VUMeter::VUMeter(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);
+       float level_lufs[2];
+       {
+               unique_lock<mutex> lock(level_mutex);
+               level_lufs[0] = this->level_lufs[0];
+               level_lufs[1] = this->level_lufs[1];
+       }
+
+       int mid = width() / 2;
 
-       // 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;
+       for (unsigned channel = 0; channel < 2; ++channel) {
+               int left = (channel == 0) ? 0 : mid;
+               int right = (channel == 0) ? mid : width();
+               float level_lu = level_lufs[channel] - ref_level_lufs;
+               int on_pos = lrint(lufs_to_pos(level_lu, height()));
 
-               // 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);
+               if (flip) {
+                       QRect on_rect(left, 0, right, height() - on_pos);
+                       QRect off_rect(left, height() - on_pos, right, height());
+
+                       painter.drawPixmap(on_rect, on_pixmap, on_rect);
+                       painter.drawPixmap(off_rect, off_pixmap, off_rect);
                } else {
-                       painter.fillRect(1, min_y, width() - 2, max_y - min_y, QColor(80, 80, 80));
+                       QRect off_rect(left, 0, right, on_pos);
+                       QRect on_rect(left, on_pos, right, height() - on_pos);
+
+                       painter.drawPixmap(off_rect, off_pixmap, off_rect);
+                       painter.drawPixmap(on_rect, on_pixmap, on_rect);
                }
        }
+}
 
-       float level_lufs;
-       {
-               unique_lock<mutex> lock(level_mutex);
-               level_lufs = this->level_lufs;
-       }
+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);
 
-       float level_lu = level_lufs + 23.0f;
-       int y = lufs_to_pos(level_lu, height());
-       painter.fillRect(0, y, width(), 2, Qt::white);
+       off_pixmap = QPixmap(width(), height());
+       QPainter off_painter(&off_pixmap);
+       draw_vu_meter(off_painter, width(), height(), 0, false, min_level, max_level, flip);
 }