[置顶] QwtSplineCurveFitter Class Reference

Detailed Description

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.
Spline	Use a default spline algorithm.
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