新增平滑曲线demo

smoothcurve/frmsmoothcurve.h

@@ -0,0 +1,31 @@
+#ifndef FRMSMOOTHCURVE_H
+#define FRMSMOOTHCURVE_H
+
+#include <QWidget>
+#include <QList>
+#include <QPointF>
+#include <QPainterPath>
+
+namespace Ui {
+class frmSmoothCurve;
+}
+
+class frmSmoothCurve : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit frmSmoothCurve(QWidget *parent = 0);
+    ~frmSmoothCurve();
+
+protected:
+    void paintEvent(QPaintEvent *event);
+
+private:
+    Ui::frmSmoothCurve *ui;
+    QVector<QPointF> datas;     //曲线上的点
+    QPainterPath smoothCurve;   //平滑曲线
+    QPainterPath smoothCurve2;  //直接连接点的非平滑曲线
+};
+
+#endif // FRMSMOOTHCURVE_H