Make reference level of VUMeter and LRAMeter adjustable.

[nageru] / lrameter.cpp

diff --git a/lrameter.cpp b/lrameter.cpp
index cd87a6c0f14e2dd52d3b155d4d994b630db79473..ab3c5c2b925dee19e3045a940eb61e500e6a8075 100644 (file)
--- a/lrameter.cpp
+++ b/lrameter.cpp
@@ -1,8 +1,12 @@
-#include <QPainter>
-
 #include "lrameter.h"
+
+#include <QPainter>
+#include <QPalette>
+#include <QPen>
 #include "vu_common.h"
 
+class QPaintEvent;
+
 using namespace std;
 
 LRAMeter::LRAMeter(QWidget *parent)
@@ -10,12 +14,15 @@ LRAMeter::LRAMeter(QWidget *parent)
 {
 }
 
+void LRAMeter::resizeEvent(QResizeEvent *event)
+{
+       recalculate_pixmaps();
+}
+
 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;
@@ -26,16 +33,24 @@ void LRAMeter::paintEvent(QPaintEvent *event)
                range_high_lufs = this->range_high_lufs;
        }
 
-       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);
+       float level_lu = level_lufs - ref_level_lufs;
+       float range_low_lu = range_low_lufs - ref_level_lufs;
+       float range_high_lu = range_high_lufs - ref_level_lufs;
+       int range_low_pos = lrint(lufs_to_pos(range_low_lu, height()));
+       int range_high_pos = lrint(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.
-       int min_y = lufs_to_pos(1.0f, height());
-       int max_y = lufs_to_pos(-1.0f, height());
+       int min_y = lrint(lufs_to_pos(1.0f, height()));
+       int max_y = lrint(lufs_to_pos(-1.0f, height()));
 
        // FIXME: This outlining isn't so pretty.
        {
@@ -57,7 +72,7 @@ void LRAMeter::paintEvent(QPaintEvent *event)
        }
 
        // Draw the integrated loudness meter, in the same color as the target area.
-       int y = lufs_to_pos(level_lu, height());
+       int y = lrint(lufs_to_pos(level_lu, height()));
        {
                QPen pen(Qt::black);
                pen.setWidth(5);
@@ -76,3 +91,18 @@ void LRAMeter::paintEvent(QPaintEvent *event)
                painter.drawRect(2, y, width() - 5, 1);
        }
 }
+
+void LRAMeter::recalculate_pixmaps()
+{
+       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, width(), height(), margin, true, min_level, max_level);
+
+       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, width(), height(), margin, false, min_level, max_level);
+}