1 files changed, 47 insertions, 0 deletions
diff --git a/src/ParallaxScrollerItem.cpp b/src/ParallaxScrollerItem.cpp
new file mode 100644
index 0000000..0480b29
--- /dev/null
+++ b/src/ParallaxScrollerItem.cpp
@@ -0,0 +1,47 @@
+#include "ParallaxScrollerItem.h"
+
+#include <QGraphicsView>
+#include <QGraphicsScene>
+#include <QScrollBar>
+
+#include <QPainter>
+#include <QDebug>
+
+ParallaxScrollerItem::ParallaxScrollerItem(QString layer, QPointF pos,
+                                           qreal depthFactor, qreal speed,
+                                           qreal factor, QGraphicsScene *scene,
+                                           QGraphicsItem *parent)
+    : QGraphicsPixmapItem(parent, scene), m_scrollSpeed(speed), m_factor(factor)
+{
+    m_scrollingSpeedSlowingFactor = 0;
+    m_layer.load(layer);
+    setPixmap(m_layer);
+    setPos(pos);
+    setZValue(depthFactor);
+}
+
+ParallaxScrollerItem::~ParallaxScrollerItem()
+{
+
+}
+
+void ParallaxScrollerItem::advance(int phase)
+{
+    if(phase == 1)
+    {
+        m_scrollingSpeedSlowingFactor++;
+        if(m_scrollingSpeedSlowingFactor % m_factor == 0)
+        {
+            m_scrollingSpeedSlowingFactor = 0;
+            setPos(x()-m_scrollSpeed, y());
+
+            QGraphicsView* v = scene()->views().first();
+            QPointF p = v->mapToScene(v->viewport()->x(), 0);
+
+            if(x() <= p.x()-pixmap().width())
+            {
+                setPos(p.x()+pixmap().width()-m_scrollSpeed, y());
+            }
+        }
+    }
+}