Add a stereo correlation meter.

[nageru] / lrameter.cpp

diff --git a/lrameter.cpp b/lrameter.cpp
index 6e9fed429a5862563c79144424acd2d0a70e2ff7..d0304e1a9e5a05082938ae817b4b21b9df5840b0 100644 (file)
--- a/lrameter.cpp
+++ b/lrameter.cpp
@@ -14,12 +14,25 @@ LRAMeter::LRAMeter(QWidget *parent)
 {
 }
 
+void LRAMeter::resizeEvent(QResizeEvent *event)
+{
+       const int margin = 5;
+
+       on_pixmap = QPixmap(width(), height());
+       QPainter on_painter(&on_pixmap);
+       on_painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
+       draw_vu_meter(on_painter, -HUGE_VAL, HUGE_VAL, width(), height(), margin);
+
+       off_pixmap = QPixmap(width(), height());
+       QPainter off_painter(&off_pixmap);
+       off_painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
+       draw_vu_meter(off_painter, -HUGE_VAL, -HUGE_VAL, width(), height(), margin);
+}
+
 void LRAMeter::paintEvent(QPaintEvent *event)
 {
        QPainter painter(this);
 
-       painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
-
        float level_lufs;
        float range_low_lufs;
        float range_high_lufs;
@@ -33,8 +46,16 @@ void LRAMeter::paintEvent(QPaintEvent *event)
        float level_lu = level_lufs + 23.0f;
        float range_low_lu = range_low_lufs + 23.0f;
        float range_high_lu = range_high_lufs + 23.0f;
-       const int margin = 5;
-       draw_vu_meter(painter, range_low_lu, range_high_lu, width(), height(), margin);
+       int range_low_pos = lufs_to_pos(range_low_lu, height());
+       int range_high_pos = lufs_to_pos(range_high_lu, height());
+
+       QRect top_off_rect(0, 0, width(), range_high_pos);
+       QRect on_rect(0, range_high_pos, width(), range_low_pos - range_high_pos);
+       QRect bottom_off_rect(0, range_low_pos, width(), height() - range_low_pos);
+
+       painter.drawPixmap(top_off_rect, off_pixmap, top_off_rect);
+       painter.drawPixmap(on_rect, on_pixmap, on_rect);
+       painter.drawPixmap(bottom_off_rect, off_pixmap, bottom_off_rect);
 
        // Draw the target area (+/-1 LU is allowed EBU range).
        // It turns green when we're within.