Added DJ audio track player

graphrenderer.cpp

@@ -0,0 +1,59 @@
+#include "graphrenderer.h"
+
+#include <iterator>
+
+#include <QPixmap>
+#include <QPainter>
+#include <QPalette>
+
+QPixmap GraphRenderer::render(const QSize &size, const frame_t *frameBegin, const frame_t *frameEnd, const QPalette &palette)
+{
+    QPixmap pixmap{size};
+
+    QPainter painter;
+    painter.begin(&pixmap);
+
+    painter.fillRect(pixmap.rect(), palette.base());
+
+    painter.setPen(Qt::white);
+    painter.setBrush(Qt::black);
+
+    painter.drawRect(QRect({}, size));
+
+    render(size, frameBegin, frameEnd, painter, palette);
+    painter.end();
+    return pixmap;
+}
+
+void GraphRenderer::render(const QSize &size, const frame_t *frameBegin, const frame_t *frameEnd, QPainter &painter, const QPalette &palette)
+{
+    if (frameEnd == frameBegin)
+        return;
+
+    painter.setPen(QPen{palette.color(QPalette::Text)});
+    painter.setBrush(palette.text());
+
+    const auto framesPerPixel = std::distance(frameBegin, frameEnd) / size.width();
+
+    for (int x = 0; x < size.width(); x++)
+    {
+        const frame_t *begin = frameBegin + (x * framesPerPixel);
+        const frame_t *end = begin + framesPerPixel;
+
+        frame_t min{1.f, 1.f}, max{-1.f, -1.f};
+        for (auto iter = begin; iter != end; iter++)
+        {
+            if ((*iter)[0] < min[0])
+                min[0] = (*iter)[0];
+            if ((*iter)[1] < min[1])
+                min[1] = (*iter)[1];
+            if ((*iter)[0] > max[0])
+                max[0] = (*iter)[0];
+            if ((*iter)[1] > max[1])
+                max[1] = (*iter)[1];
+        }
+
+        painter.drawLine(x, (size.height() / 2) - (min[0] * (size.height() / 2)),
+                         x, (size.height() / 2) + (max[0] * (size.height() / 2)));
+    }
+}