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Detailed Description
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A curve fitter using cubic splines.
QwtSplineCurveFitter 是产生立体样条的曲线效果。（翻译不精确。。。反正和立体效果有关），感觉没什么大用。
在示例程序中，curvdemo2中，好像不起什么作用，我认为它只是改变了将点连起来的线条样式。
| Auto | Use the default spline algorithm for polygons with increasing x values ( p[i-1] < p[i] ), otherwise use a parametric spline algorithm. |
| class="anchor" id="a8c5e6858f885b5691c30092a950879a8a97f3e821b70470f056b60a883229ec13" style="color:rgb(61,87,140)">Spline | Use a default spline algorithm. |
| class="anchor" id="a8c5e6858f885b5691c30092a950879a8a877f71e694ae9a2e33533a3fb5065c66" style="color:rgb(61,87,140)">ParametricSpline | Use a parametric spline algorithm. |
curve[i]是一个线条
curveFitter = new QwtSplineCurveFitter();
curveFitter->setFitMode(QwtSplineCurveFitter::Spline);//两点用折线
curveFitter->setSplineSize(150);
curve[i].setCurveFitter(curveFitter);
curveFitter = new QwtSplineCurveFitter();
curveFitter->setFitMode(QwtSplineCurveFitter::ParametricSpline );// 生成参数样条曲线
curveFitter->setSplineSize(150);
curveFitter = new QwtSplineCurveFitter();
curveFitter->setFitMode(QwtSplineCurveFitter::Auto );
curveFitter->setSplineSize(150);
polygons 多边形
