#include <osg/BezierCurves>对应的cpp文件源码

很抱歉，这个问题的回答需要更多的上下文信息。

`osg/BezierCurves` 是 OpenSceneGraph 库中用于实现贝塞尔曲线的头文件之一，但是它并不是一个完整的类或函数，而是一个包含了一些函数声明和类声明的头文件。因此，如果您想要查看 `osg/BezierCurves` 中的具体实现，需要先了解调用了这个头文件的代码所在的上下文以及使用的具体函数或类。

如果您能提供更多的上下文信息或者代码片段，我可以更准确地回答您的问题。

相关问题

#include <osg/BezierCurves>头文件源码

以下是 `osg/BezierCurves` 头文件的源码：

#ifndef OSG_BEZIERCURVES
#define OSG_BEZIERCURVES 1

#include <osg/Array>
#include <osg/Vec3>

namespace osg {

/** A class for representing Bezier curves. */
class BezierCurve
{
    public:

        BezierCurve() {}

        BezierCurve(const BezierCurve& copy, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
            _controlPoints(copy._controlPoints),
            _tessellation(copy._tessellation),
            _tessellationCache(copy._tessellationCache),
            _dirty(true) {}

        BezierCurve(const osg::Vec3Array* controlPoints):
            _controlPoints(controlPoints),
            _tessellation(10),
            _dirty(true) {}

        BezierCurve(const osg::Vec3Array* controlPoints, unsigned int tessellation):
            _controlPoints(controlPoints),
            _tessellation(tessellation),
            _dirty(true) {}

        inline void setControlPoints(const osg::Vec3Array* controlPoints) { _controlPoints = controlPoints; _dirty=true; }
        inline const osg::Vec3Array* getControlPoints() const { return _controlPoints.get(); }

        inline void setTessellation(unsigned int tessellation) { _tessellation = tessellation; _dirty=true; }
        inline unsigned int getTessellation() const { return _tessellation; }

        inline const osg::Vec3Array* getTessellationCache() const { if (_dirty) const_cast<BezierCurve*>(this)->buildCache(); return _tessellationCache.get(); }

        inline osg::Vec3 evaluate(float t) const
        {
            if (_dirty) const_cast<BezierCurve*>(this)->buildCache();
            return _tessellationCache->at(unsigned int(t*float(_tessellation)));
        }

        inline void evaluate(float t, osg::Vec3& P, osg::Vec3& T) const
        {
            if (_dirty) const_cast<BezierCurve*>(this)->buildCache();

            unsigned int index = unsigned int(t*float(_tessellation));
            const osg::Vec3& p0 = _tessellationCache->at(index);
            const osg::Vec3& p1 = _tessellationCache->at(index+1);

            P = p0;
            T = p1-p0;
        }

    private:

        void buildCache() const;

        osg::ref_ptr<const osg::Vec3Array> _controlPoints;
        unsigned int _tessellation;
        mutable osg::ref_ptr<osg::Vec3Array> _tessellationCache;
        mutable bool _dirty;
};


/** A class for representing a set of Bezier curves */
class BezierCurveArray : public osg::Array<BezierCurve>
{
    public:

        BezierCurveArray(){}

        BezierCurveArray(const BezierCurveArray& copy, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
            osg::Array<BezierCurve>(copy,copyop) {}

        META_Array(osg, BezierCurveArray, 0x160);

};

}

#endif

该头文件定义了 `BezierCurve` 和 `BezierCurveArray` 两个类，用于表示贝塞尔曲线。其中， `BezierCurve` 类用于表示一条贝塞尔曲线，包括控制点、分割数量等属性；`BezierCurveArray` 类则是一个贝塞尔曲线数组。

osg/BezierCurves源码

以下是一份使用OpenSceneGraph实现Bezier曲线的示例代码:

#include <osg/Geode>
#include <osg/Geometry>
#include <osgViewer/Viewer>

osg::Vec3Array* createBezierCurve(osg::Vec3Array* points, int numSteps)
{
    osg::Vec3Array* curvePoints = new osg::Vec3Array;

    for (int i = 0; i < numSteps; i++)
    {
        float t = (float)i / (float)(numSteps - 1);

        // Calculate blending functions
        float b0 = (1.0f - t) * (1.0f - t) * (1.0f - t);
        float b1 = 3.0f * t * (1.0f - t) * (1.0f - t);
        float b2 = 3.0f * t * t * (1.0f - t);
        float b3 = t * t * t;

        // Calculate point on curve
        osg::Vec3 p = b0 * (*points)[0] +
                      b1 * (*points)[1] +
                      b2 * (*points)[2] +
                      b3 * (*points)[3];

        curvePoints->push_back(p);
    }

    return curvePoints;
}

int main(int argc, char** argv)
{
    // Set up points for Bezier curve
    osg::Vec3Array* points = new osg::Vec3Array;
    points->push_back(osg::Vec3(-1.0f, 0.0f, 0.0f));
    points->push_back(osg::Vec3(-0.5f, 1.0f, 0.0f));
    points->push_back(osg::Vec3(0.5f, -1.0f, 0.0f));
    points->push_back(osg::Vec3(1.0f, 0.0f, 0.0f));

    // Create geometry for curve
    osg::Geometry* curveGeom = new osg::Geometry;
    curveGeom->setVertexArray(createBezierCurve(points, 20));

    // Set up color array for curve
    osg::Vec4Array* colors = new osg::Vec4Array;
    colors->push_back(osg::Vec4(1.0f, 1.0f, 0.0f, 1.0f));
    curveGeom->setColorArray(colors);
    curveGeom->setColorBinding(osg::Geometry::BIND_OVERALL);

    // Create line primitive for curve
    curveGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINE_STRIP, 0, 20));

    // Create geode for curve geometry
    osg::Geode* curveGeode = new osg::Geode;
    curveGeode->addDrawable(curveGeom);

    // Create viewer and add curve geode to scene
    osgViewer::Viewer viewer;
    viewer.setSceneData(curveGeode);
    return viewer.run();
}

这个示例代码定义了一个名为createBezierCurve的函数，它接收一个osg::Vec3Array类型的点数组和一个整数，用于指定在曲线上生成多少个点。该函数返回一个osg::Vec3Array类型的数组，包含生成的曲线上的点。

主函数中，我们使用createBezierCurve函数创建了一个Bezier曲线，并将其添加到一个osg::Geometry对象中。我们还定义了一个osg::Vec4Array类型的颜色数组，用于指定曲线的颜色。最后，我们创建一个osg::Geode对象，并将曲线的osg::Geometry对象添加到其中。我们将osg::Geode对象作为场景数据传递给osgViewer::Viewer对象，这样就可以在窗口中显示曲线了。