Make the compression meter nonlinear.

[nageru] / compression_reduction_meter.h

diff --git a/compression_reduction_meter.h b/compression_reduction_meter.h
new file mode 100644 (file)
index 0000000..5890c13
--- /dev/null
+++ b/compression_reduction_meter.h
@@ -0,0 +1,54 @@
+#ifndef COMPRESSION_REDUCTION_METER_H
+#define COMPRESSION_REDUCTION_METER_H
+
+// A meter that goes downwards instead of upwards, and has a non-linear scale.
+
+#include <math.h>
+#include <QPixmap>
+#include <QString>
+#include <QWidget>
+#include <mutex>
+
+#include "piecewise_interpolator.h"
+
+class QObject;
+class QPaintEvent;
+class QResizeEvent;
+
+class CompressionReductionMeter : public QWidget
+{
+       Q_OBJECT
+
+public:
+       CompressionReductionMeter(QWidget *parent);
+
+       void set_reduction_db(float level_db) {
+               std::unique_lock<std::mutex> lock(level_mutex);
+               this->level_db = level_db;
+               QMetaObject::invokeMethod(this, "update", Qt::AutoConnection);
+       }
+
+private:
+       void resizeEvent(QResizeEvent *event) override;
+       void paintEvent(QPaintEvent *event) override;
+       void recalculate_pixmaps();
+       void draw_scale(QPainter *painter, int x_pos);
+       double db_to_pos(double db) const;
+       int meter_height() const;
+
+       std::mutex level_mutex;
+       float level_db = 0.0f;
+
+       static constexpr float min_level = 0.0f;  // Must match control_points (in the .cpp file).
+       static constexpr float max_level = 6.0f;  // Same.
+       static constexpr int meter_width = 20;
+
+       // Size of the text box. The meter will be shrunk to make room for the text box
+       // (half the height) on both sides.
+       static constexpr int text_box_width = 15;
+       static constexpr int text_box_height = 10;
+
+       QPixmap on_pixmap, off_pixmap;
+};
+
+#endif