From 0a3cbf6ad29b0ae66fce4c61ceb9a30d2276664e 2012-10-24 07:50:49
From: Marek Rosa <marek.rosa@digia.com>
Date: 2012-10-24 07:50:49
Subject: [PATCH] Added axes titles to audio example and decreased the number of samples on chart to 2000

---

diff --git a/demos/audio/widget.cpp b/demos/audio/widget.cpp
index 8d5a6f6..bce89be 100644
--- a/demos/audio/widget.cpp
+++ b/demos/audio/widget.cpp
@@ -23,13 +23,16 @@ Widget::Widget(QWidget *parent)
     m_series = new QLineSeries;
     m_chart->addSeries(m_series);
     QValueAxis *axisX = new QValueAxis;
-    axisX->setRange(0, 4000);
+    axisX->setRange(0, 2000);
+    axisX->setLabelFormat("%g");
+    axisX->setTitle("Samples");
     QValueAxis *axisY = new QValueAxis;
-    axisY->setRange(0, 256);
-    m_chart->setAxisX(axisX, m_series);
+    axisY->setRange(-1, 1);
+    axisY->setTitle("Audio level");
+    m_chart->setAxisX(axisX, m_series);    
     m_chart->setAxisY(axisY, m_series);
     m_chart->legend()->hide();
-    m_chart->setTitle("Data from microphone");
+    m_chart->setTitle("Data from the microphone");
 
     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout->addWidget(chartView);
diff --git a/demos/audio/xyseriesiodevice.cpp b/demos/audio/xyseriesiodevice.cpp
index a833d4a..4d06861 100644
--- a/demos/audio/xyseriesiodevice.cpp
+++ b/demos/audio/xyseriesiodevice.cpp
@@ -16,20 +16,21 @@ qint64 XYSeriesIODevice::readData(char * data, qint64 maxSize)
 
 qint64 XYSeriesIODevice::writeData(const char * data, qint64 maxSize)
 {
-    qint64 range = 4000;
+    qint64 range = 2000;
     QList<QPointF> oldPoints = m_series->points();
     QList<QPointF> points;
+    int resolution = 4;
 
     if (oldPoints.count() < range) {
         points = m_series->points();
     } else {
-        for (int i = maxSize/2; i < oldPoints.count(); i++)
-            points.append(QPointF(i - maxSize/2, oldPoints.at(i).y()));
+        for (int i = maxSize/resolution; i < oldPoints.count(); i++)
+            points.append(QPointF(i - maxSize/resolution, oldPoints.at(i).y()));
     }
 
     qint64 size = points.count();
-    for (int k = 0; k < maxSize/2; k++)
-        points.append(QPointF(k + size, (quint8)data[2 * k]));
+    for (int k = 0; k < maxSize/resolution; k++)
+        points.append(QPointF(k + size, ((quint8)data[resolution * k] - 128)/128.0));
 
     m_series->replace(points);
     return maxSize;