新增qwt源码版本

qwtdemo/examples/legends/mainwindow.h

@@ -0,0 +1,20 @@
+#include <qmainwindow.h>
+
+class Plot;
+class Panel;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow( QWidget *parent = 0 );
+
+private Q_SLOTS:
+    void updatePlot();
+    void exportPlot();
+
+private:
+    Plot *d_plot;
+    Panel *d_panel;
+};