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 ab40fceff699ec13df3f3db1c86eefdbd73ed3bf..50f0f143f7e575d03f8e0810130cad28da010424 100644 (file)
--- a/vumeter.cpp
+++ b/vumeter.cpp
@@ -10,16 +10,53 @@ VUMeter::VUMeter(QWidget *parent)
 {
 }
 
+void VUMeter::resizeEvent(QResizeEvent *event)
+{
+       recalculate_pixmaps();
+}
+
 void VUMeter::paintEvent(QPaintEvent *event)
 {
        QPainter painter(this);
 
-       float level_lufs;
+       float level_lufs[2];
        {
                unique_lock<mutex> lock(level_mutex);
-               level_lufs = this->level_lufs;
+               level_lufs[0] = this->level_lufs[0];
+               level_lufs[1] = this->level_lufs[1];
+       }
+
+       int mid = width() / 2;
+
+       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()));
+
+               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 {
+                       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);
+               }
        }
+}
+
+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;
-       draw_vu_meter(painter, -HUGE_VAL, level_lu, width(), height(), 0);
+       off_pixmap = QPixmap(width(), height());
+       QPainter off_painter(&off_pixmap);
+       draw_vu_meter(off_painter, width(), height(), 0, false, min_level, max_level, flip);
 }