新增qwt源码版本

qwtdemo/examples/dials/attitude_indicator.h

@@ -0,0 +1,39 @@
+#include <qwt_dial.h>
+#include <qwt_dial_needle.h>
+
+class AttitudeIndicatorNeedle: public QwtDialNeedle
+{
+public:
+    AttitudeIndicatorNeedle( const QColor & );
+
+protected:
+    virtual void drawNeedle( QPainter *,
+        double length, QPalette::ColorGroup ) const;
+};
+
+class AttitudeIndicator: public QwtDial
+{
+    Q_OBJECT
+
+public:
+    AttitudeIndicator( QWidget *parent = NULL );
+
+    double angle() const { return value(); }
+    double gradient() const { return d_gradient; }
+
+public Q_SLOTS:
+    void setGradient( double );
+    void setAngle( double angle ) { setValue( angle ); }
+
+protected:
+    virtual void keyPressEvent( QKeyEvent * );
+
+    virtual void drawScale( QPainter *, 
+        const QPointF &center, double radius ) const;
+
+    virtual void drawScaleContents( QPainter *painter,
+        const QPointF &center, double radius ) const;
+
+private:
+    double d_gradient;
+};