新增qwt源码版本

qwtdemo/examples/oscilloscope/curvedata.h

@@ -0,0 +1,16 @@
+#include <qwt_series_data.h>
+#include <qpointer.h>
+
+class SignalData;
+
+class CurveData: public QwtSeriesData<QPointF>
+{
+public:
+    const SignalData &values() const;
+    SignalData &values();
+
+    virtual QPointF sample( size_t i ) const;
+    virtual size_t size() const;
+
+    virtual QRectF boundingRect() const;
+};