新增qwt源码版本

qwtdemo/examples/oscilloscope/knob.h

@@ -0,0 +1,38 @@
+#ifndef _KNOB_H_
+#define _KNOB_H_
+
+#include <qwidget.h>
+
+class QwtKnob;
+class QLabel;
+
+class Knob: public QWidget
+{
+    Q_OBJECT
+
+    Q_PROPERTY( QColor theme READ theme WRITE setTheme )
+
+public:
+    Knob( const QString &title,
+        double min, double max, QWidget *parent = NULL );
+
+    virtual QSize sizeHint() const;
+
+    void setValue( double value );
+    double value() const;
+
+    void setTheme( const QColor & );
+    QColor theme() const;
+
+Q_SIGNALS:
+    double valueChanged( double );
+
+protected:
+    virtual void resizeEvent( QResizeEvent * );
+
+private:
+    QwtKnob *d_knob;
+    QLabel *d_label;
+};
+
+#endif