Move everything into a separate futatabi/ subdir, for the upcoming merge with Futatabi.

[nageru] / nageru / correlation_meter.cpp

diff --git a/nageru/correlation_meter.cpp b/nageru/correlation_meter.cpp
new file mode 100644 (file)
index 0000000..7b7683a
--- /dev/null
+++ b/nageru/correlation_meter.cpp
@@ -0,0 +1,63 @@
+#include "correlation_meter.h"
+
+#include <math.h>
+#include <algorithm>
+
+#include <QBrush>
+#include <QColor>
+#include <QPainter>
+#include <QRect>
+
+class QPaintEvent;
+class QResizeEvent;
+
+using namespace std;
+
+CorrelationMeter::CorrelationMeter(QWidget *parent)
+       : QWidget(parent)
+{
+}
+
+void CorrelationMeter::resizeEvent(QResizeEvent *event)
+{
+       on_pixmap = QPixmap(width(), height());
+       QPainter on_painter(&on_pixmap);
+       QLinearGradient on(0, 0, width(), 0);
+       on.setColorAt(0.0f, QColor(255, 0, 0));
+       on.setColorAt(0.5f, QColor(255, 255, 0));
+       on.setColorAt(0.8f, QColor(0, 255, 0));
+       on.setColorAt(0.95f, QColor(255, 255, 0));
+       on_painter.fillRect(0, 0, width(), height(), Qt::black);
+       on_painter.fillRect(1, 1, width() - 2, height() - 2, on);
+
+       off_pixmap = QPixmap(width(), height());
+       QPainter off_painter(&off_pixmap);
+       QLinearGradient off(0, 0, width(), 0);
+       off.setColorAt(0.0f, QColor(127, 0, 0));
+       off.setColorAt(0.5f, QColor(127, 127, 0));
+       off.setColorAt(0.8f, QColor(0, 127, 0));
+       off.setColorAt(0.95f, QColor(127, 127, 0));
+       off_painter.fillRect(0, 0, width(), height(), Qt::black);
+       off_painter.fillRect(1, 1, width() - 2, height() - 2, off);
+}
+
+void CorrelationMeter::paintEvent(QPaintEvent *event)
+{
+       QPainter painter(this);
+
+       float correlation;
+       {
+               unique_lock<mutex> lock(correlation_mutex);
+               correlation = this->correlation;
+       }
+
+       // Just in case.
+       correlation = std::min(std::max(correlation, -1.0f), 1.0f);
+
+       int pos = 3 + lrintf(0.5f * (correlation + 1.0f) * (width() - 6));
+       QRect off_rect(0, 0, width(), height());
+       QRect on_rect(pos - 2, 0, 5, height());
+
+       painter.drawPixmap(off_rect, off_pixmap, off_rect);
+       painter.drawPixmap(on_rect, on_pixmap, on_rect);
+}