新增qwt源码版本

qwtdemo/examples/oscilloscope/curvedata.cpp

@@ -0,0 +1,27 @@
+#include "curvedata.h"
+#include "signaldata.h"
+
+const SignalData &CurveData::values() const
+{
+    return SignalData::instance();
+}
+
+SignalData &CurveData::values()
+{
+    return SignalData::instance();
+}
+
+QPointF CurveData::sample( size_t i ) const
+{
+    return SignalData::instance().value( i );
+}
+
+size_t CurveData::size() const
+{
+    return SignalData::instance().size();
+}
+
+QRectF CurveData::boundingRect() const
+{
+    return SignalData::instance().boundingRect();
+}