Let y-axis range be -1 to 1

src/pulsescopewidget.cpp

@@ -50,7 +50,7 @@ PulseScopeWidget::PulseScopeWidget(QWidget *parent) : QGraphicsView(parent),
     }
 
     m_scopeSizeH = 360.0;
-    m_scopeSizeV = 1.0;
+    m_scopeSizeV = 2.0;
 
     m_path = NULL;
     m_marker = m_scene.addLine(0.0, 0.0, 0.0, m_scopeSizeV);
@@ -78,9 +78,9 @@ void PulseScopeWidget::drawCurve(const QVector<double>& vector)
 {
     m_data = vector;
 
-    QPainterPath pulsePath(QPointF(0.0, m_scopeSizeV - m_data.at(0)));
+    QPainterPath pulsePath(QPointF(0.0, m_scopeSizeV - m_data.at(0) - 1.0));
     for(int i = 1; i < m_scopeSizeH; ++i) {
-        pulsePath.lineTo(i, m_scopeSizeV - m_data.at(i));
+        pulsePath.lineTo(i, m_scopeSizeV - m_data.at(i) - 1.0);
     }
     if(m_path == NULL) {
         m_path = m_scene.addPath(pulsePath, QPen(Qt::yellow));