3 #include "correlation_meter.h"
7 CorrelationMeter::CorrelationMeter(QWidget *parent)
12 void CorrelationMeter::resizeEvent(QResizeEvent *event)
14 on_pixmap = QPixmap(width(), height());
15 QPainter on_painter(&on_pixmap);
16 QLinearGradient on(0, 0, width(), 0);
17 on.setColorAt(0.0f, QColor(255, 0, 0));
18 on.setColorAt(0.5f, QColor(255, 255, 0));
19 on.setColorAt(0.8f, QColor(0, 255, 0));
20 on.setColorAt(0.95f, QColor(255, 255, 0));
21 on_painter.fillRect(0, 0, width(), height(), Qt::black);
22 on_painter.fillRect(1, 1, width() - 2, height() - 2, on);
24 off_pixmap = QPixmap(width(), height());
25 QPainter off_painter(&off_pixmap);
26 QLinearGradient off(0, 0, width(), 0);
27 off.setColorAt(0.0f, QColor(127, 0, 0));
28 off.setColorAt(0.5f, QColor(127, 127, 0));
29 off.setColorAt(0.8f, QColor(0, 127, 0));
30 off.setColorAt(0.95f, QColor(127, 127, 0));
31 off_painter.fillRect(0, 0, width(), height(), Qt::black);
32 off_painter.fillRect(1, 1, width() - 2, height() - 2, off);
35 void CorrelationMeter::paintEvent(QPaintEvent *event)
37 QPainter painter(this);
41 unique_lock<mutex> lock(correlation_mutex);
42 correlation = this->correlation;
46 correlation = std::min(std::max(correlation, -1.0f), 1.0f);
48 int pos = 3 + lrintf(0.5f * (correlation + 1.0f) * (width() - 6));
49 QRect off_rect(0, 0, width(), height());
50 QRect on_rect(pos - 2, 0, 5, height());
52 painter.drawPixmap(off_rect, off_pixmap, off_rect);
53 painter.drawPixmap(on_rect, on_pixmap, on_rect);