彻底改版2.0

third/qwtdemo/examples/oscilloscope/samplingthread.h

@@ -0,0 +1,25 @@
+#include <qwt_sampling_thread.h>
+
+class SamplingThread: public QwtSamplingThread
+{
+    Q_OBJECT
+
+public:
+    SamplingThread( QObject *parent = NULL );
+
+    double frequency() const;
+    double amplitude() const;
+
+public Q_SLOTS:
+    void setAmplitude( double );
+    void setFrequency( double );
+
+protected:
+    virtual void sample( double elapsed );
+
+private:
+    virtual double value( double timeStamp ) const;
+
+    double d_frequency;
+    double d_amplitude;
+};