diff --git a/src/qchart.cpp b/src/qchart.cpp
index bf53b4d..9cc8430 100644
--- a/src/qchart.cpp
+++ b/src/qchart.cpp
@@ -8,71 +8,105 @@
 
 QCHART_BEGIN_NAMESPACE
 
+class QChartPrivate
+{
+public:
+
+    QChartPrivate(QChart* parent):
+    m_axisX(new Axis(parent)),
+    m_axisY(new Axis(parent)),
+    m_grid(new XYGrid(parent)),
+    m_plotDataIndex(0),
+    m_marginSize(0){}
+
+    Axis* m_axisX;
+    Axis* m_axisY;
+    XYGrid* m_grid;
+    QRect m_rect;
+    QList<const QChartSeries*> m_series;
+    QList<XYPlotDomain> m_plotDataList;
+    QList<QGraphicsItem*> m_items;
+    int m_plotDataIndex;
+    int m_marginSize;
+
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
 QChart::QChart(QGraphicsItem* parent):QGraphicsItem(parent),
-m_marginSize(0),
-m_axisX(new Axis(this)),
-m_axisY(new Axis(this)),
-m_grid(new XYGrid(this)),
-m_plotDataIndex(0)
+d_ptr(new QChartPrivate(this))
 {
-  //  setFlags(QGraphicsItem::ItemClipsChildrenToShape);
+    //  setFlags(QGraphicsItem::ItemClipsChildrenToShape);
     // set axis
-        m_axisY->rotate(90);
-
+    Q_D(QChart);
+    d->m_axisY->rotate(90);
 
-        //TODO hardcoded values , to removed soon
-        XYPlotDomain* data = new XYPlotDomain();
-        data->m_minX = 0.0;
-        data->m_maxX = 100.0;
-        data->m_minY = 0.0;
-        data->m_maxY = 100.0;
-        data->m_ticksX=4;
-        data->m_ticksY=4;
+    //TODO hardcoded values , to removed soon
+    XYPlotDomain data;
+    data.m_minX = 0.0;
+    data.m_maxX = 100.0;
+    data.m_minY = 0.0;
+    data.m_maxY = 100.0;
+    data.m_ticksX=4;
+    data.m_ticksY=4;
 
-        m_plotDataList.clear();
-        m_plotDataList << data;
+    d->m_plotDataList.clear();
+    d->m_plotDataList << data;
 
-        m_grid->setZValue(10);
-        m_grid->setXYPlotData(*m_plotDataList.at(0));
+    d->m_grid->setZValue(10);
+    d->m_grid->setXYPlotData(d->m_plotDataList.at(0));
 }
 
 QChart::~QChart(){}
 
 QRectF QChart::boundingRect() const
 {
-    return m_rect;
+    Q_D(const QChart);
+    return d->m_rect;
 }
 
 void QChart::addSeries(QChartSeries* series)
 {
-    m_series<<series;
+    Q_D(QChart);
+    d->m_series<<series;
 
     switch(series->type())
     {
     case QChartSeries::LINE:
         XYLineChartItem* item = new XYLineChartItem(reinterpret_cast<QXYChartSeries*>(series),this);
-        item->updateXYPlotData(*m_plotDataList.at(0));
-        m_items<<item;
+        item->updateXYPlotData(d->m_plotDataList.at(0));
+        d->m_items<<item;
         break;
     }
 }
 
-void QChart::setSize(const QSizeF& size) {
+void QChart::setSize(const QSizeF& size)
+{
+    Q_D(QChart);
     //TODO refactor to setGeometry
-    m_rect = QRect(QPoint(0,0),size.toSize());
-    m_rect.adjust(margin(),margin(),-margin(),-margin());
-    m_grid->setPos(m_rect.topLeft());
-    m_grid->setSize(m_rect.size());
-    m_plotDataList.at(0)->m_viewportRect = m_rect;
-    foreach(QGraphicsItem* item , m_items)
-    reinterpret_cast<XYLineChartItem*>(item)->updateXYPlotData(*m_plotDataList.at(0));
+    d->m_rect = QRect(QPoint(0,0),size.toSize());
+    d->m_rect.adjust(margin(),margin(),-margin(),-margin());
+    d->m_grid->setPos(d->m_rect.topLeft());
+    d->m_grid->setSize(d->m_rect.size());
+    d->m_plotDataList[0].m_viewportRect = d->m_rect;
+    foreach(QGraphicsItem* item , d->m_items)
+    reinterpret_cast<XYLineChartItem*>(item)->updateXYPlotData(d->m_plotDataList.at(0));
     update();
 
 }
 
+int QChart::margin() const
+{
+    Q_D(const QChart);
+    return d->m_marginSize;
+}
+
 void QChart::setMargin(int margin)
 {
-    m_marginSize = margin;
+    Q_D(QChart);
+    d->m_marginSize = margin;
 }
 
+
+
 QCHART_END_NAMESPACE
diff --git a/src/qchart.h b/src/qchart.h
index 76e5bce..d7932e6 100644
--- a/src/qchart.h
+++ b/src/qchart.h
@@ -10,6 +10,7 @@ class Axis;
 class XYGrid;
 class QChartSeries;
 class XYPlotDomain;
+class QChartPrivate;
 
 class QCHART_EXPORT QChart : public QGraphicsItem
 {
@@ -26,18 +27,15 @@ public:
 
     virtual void setSize(const QSizeF& rect);
     void setMargin(int margin);
-    int margin() const { return m_marginSize;}
+    int margin() const;
+
+protected:
+    QChartPrivate * const d_ptr;
 
 private:
-    QRect m_rect;
-    QList<const QChartSeries*> m_series;
-    Axis* m_axisX;
-    Axis* m_axisY;
-    XYGrid* m_grid;
-    QList<XYPlotDomain*> m_plotDataList;
-    QList<QGraphicsItem*> m_items;
-    int m_plotDataIndex;
-    int m_marginSize;
+    Q_DISABLE_COPY(QChart)
+    Q_DECLARE_PRIVATE(QChart)
+
 };
 
 QCHART_END_NAMESPACE
diff --git a/src/qchartwidget.cpp b/src/qchartwidget.cpp
index 1956c23..d3a146d 100644
--- a/src/qchartwidget.cpp
+++ b/src/qchartwidget.cpp
@@ -12,8 +12,7 @@ public:
     QChartWidgetPrivate(QChartWidget *parent) :
     m_view(0),
     m_scene(0),
-    m_chart(0),
-    q_ptr( parent )
+    m_chart(0)
     {
         m_scene = new QGraphicsScene();
         m_view = new QGraphicsView(parent);
@@ -28,10 +27,10 @@ public:
     QGraphicsView *m_view;
     QGraphicsScene *m_scene;
     QChart* m_chart;
-    QChartWidget * const q_ptr;
-    Q_DECLARE_PUBLIC(QChartWidget);
 };
 
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
 QChartWidget::QChartWidget(QWidget *parent) :
     QWidget(parent),
     d_ptr(new QChartWidgetPrivate(this))