X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=nageru%2Fpeak_display.cpp;fp=nageru%2Fpeak_display.cpp;h=eda6b540fdbeffe4df6ee6799f03662512e99e29;hb=bd01e11a41a19fef2315319909d8655cac359f0f;hp=0000000000000000000000000000000000000000;hpb=a944bad466ba5601a96f6833e1ea2eb31f9b55af;p=nageru

diff --git a/nageru/peak_display.cpp b/nageru/peak_display.cpp
new file mode 100644
index 0000000..eda6b54
--- /dev/null
+++ b/nageru/peak_display.cpp
@@ -0,0 +1,42 @@
+#include "peak_display.h"
+
+#include <math.h>
+
+#include <memory>
+
+#include <QPainter>
+#include <QPaintEvent>
+#include <QRect>
+
+#include "audio_clip.h"
+
+using namespace std;
+
+PeakDisplay::PeakDisplay(QWidget *parent)
+	: QWidget(parent)
+{
+}
+
+void PeakDisplay::audio_clip_updated()
+{
+	QMetaObject::invokeMethod(this, "repaint", Qt::QueuedConnection);
+}
+
+void PeakDisplay::paintEvent(QPaintEvent *event)
+{
+	int w = width();
+	unique_ptr<pair<float, float>[]> min_max = audio_clip->get_min_max_peaks(w);
+
+	QPainter painter(this);
+	painter.fillRect(event->rect(), Qt::white);
+	painter.setClipRect(event->rect());
+	double mid_y = double(height()) * 0.5;
+	double scale_y = height() * 0.5;
+	for (int x = 0; x < w; ++x) {
+		if (isnan(min_max[x].first)) continue;
+
+		int y_min = lrint(min_max[x].first * scale_y + mid_y);
+		int y_max = lrint(min_max[x].second * scale_y + mid_y);
+		painter.drawLine(x, y_min, x, y_max);
+	}
+}