新增qwt源码版本

qwtdemo/examples/bode/plot.h

@@ -0,0 +1,31 @@
+#ifndef _PLOT_H_
+#define _PLOT_H_
+
+#include <qwt_plot.h>
+
+class QwtPlotCurve;
+class QwtPlotMarker;
+
+class Plot: public QwtPlot
+{
+    Q_OBJECT
+
+public:
+    Plot( QWidget *parent );
+
+public Q_SLOTS:
+    void setDamp( double damping );
+
+private:
+    void showData( const double *frequency, const double *amplitude,
+        const double *phase, int count );
+    void showPeak( double freq, double amplitude );
+    void show3dB( double freq );
+
+    QwtPlotCurve *d_curve1;
+    QwtPlotCurve *d_curve2;
+    QwtPlotMarker *d_marker1;
+    QwtPlotMarker *d_marker2;
+};
+
+#endif