X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=compression_reduction_meter.h;fp=compression_reduction_meter.h;h=5890c1381db38b7fa45932813236c7913b97ac4b;hb=0066ae51753e9ba7dbe54ab9c6f24fd861db41a2;hp=0000000000000000000000000000000000000000;hpb=9e93fbea58c068d14dd9dad5d0f5226edeef3395;p=nageru

diff --git a/compression_reduction_meter.h b/compression_reduction_meter.h
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+++ b/compression_reduction_meter.h
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+#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