在VC6.0坏境下，用mfc编写的绘制3次Bezier曲线的完整代码,其功能为：单击左键绘制控制多边形和坐标点，单击右键绘制曲线。
具体操作步骤如下：（1）新建mfc,工程名为Bezier。
（2）编辑菜单资源并添加消息处理函数OnBezier。
（3）在工程主文件中编写代码如下（红色字体为要添加代码）。
// BezierView.cpp : implementation of the CBezierView class//#include "stdafx.h"#include "Bezier.h"#include "BezierDoc.h"#include "BezierView.h"#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#define T 20#endif/////////////////////////////////////////////////////////////////////////////// CBezierViewIMPLEMENT_DYNCREATE(CBezierView, CView)BEGIN_MESSAGE_MAP(CBezierView, CView)//{{AFX_MSG_MAP(CBezierView)// NOTE - the ClassWizard will add and remove mapping macros here.// DO NOT EDIT what you see in these blocks of generated code!ON_WM_RBUTTONDOWN()ON_WM_LBUTTONDOWN()//}}AFX_MSG_MAP// Standard printing commandsON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CBezierView construction/destructionCBezierView::CBezierView(){// TODO: add construction code here}CBezierView::~CBezierView(){}BOOL CBezierView::PreCreateWindow(CREATESTRUCT& cs){// TODO: Modify the Window class or styles here by modifying// the CREATESTRUCT csreturn CView::PreCreateWindow(cs);}/////////////////////////////////////////////////////////////////////////////// CBezierView drawingvoid CBezierView::OnDraw(CDC* pDC){CBezierDoc* pDoc = GetDocument();ASSERT_VALID(pDoc);pDC->TextOut(30,20,"开始绘制3次Bezier曲线,单击左键绘制控制多边形，单击右键绘制曲线");// TODO: add draw code for native data here}/////////////////////////////////////////////////////////////////////////////// CBezierView printingBOOL CBezierView::OnPreparePrinting(CPrintInfo* pInfo){// default preparationreturn DoPreparePrinting(pInfo);}void CBezierView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/){// TODO: add extra initialization before printing}void CBezierView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/){// TODO: add cleanup after printing}/////////////////////////////////////////////////////////////////////////////// CBezierView diagnostics#ifdef _DEBUGvoid CBezierView::AssertValid() const{CView::AssertValid();}void CBezierView::Dump(CDumpContext& dc) const{CView::Dump(dc);}CBezierDoc* CBezierView::GetDocument() // non-debug version is inline{ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CBezierDoc)));return (CBezierDoc*)m_pDocument;}#endif //_DEBUG/////////////////////////////////////////////////////////////////////////////// CBezierView message handlersint k=0;float BEN[4][4]={-1,3,-3,1, 3,-6,3,0, -3,3,0,0, 1,0,0,0};float point[4][3] ={100,100,1,200,300,1,400,300,1,300,100,1};//给定控制点void bezier(CDC*pDC,int n, int t, float p[4][3]);void matx44(float a[4][4],float b[4][3],float c[4][3]);void matx14(float a[4],float b[4][3], float c[3]);void bezier (CDC*pDC,int n,int t, float point[4][3]) //绘制Bezier曲线{float cc[4][3];float pp[3];int i,xx,yy,a,b;float u[4];u[3]=1.0;a=point[0][0],b=point[0][1]; // 第一个控制点的横、纵坐标for(i=2;i<=T;i++){u[2]=(1.0/T)*i;u[1]=u[2]*u[2];u[0]=u[2]*u[2]*u[2];matx44(BEN,point,cc);matx14(u,cc,pp); xx=pp[0],yy=pp[1];pDC->MoveTo(a,b);pDC->LineTo(xx,yy);a=xx;b=yy;}}void matx44(float a[4][4],float b[4][3],float c[4][3]){int i,j,m;for(i=0;i<4;i++)for(j=0;j<3;j++) c[i][j]=0.0; //初始化中间矩阵for(m=0;m<4;m++)for(i=0;i<3;i++)for(j=0;j<4;j++)c[m][i]+=a[m][j]*b[j][i];return;}void matx14(float a[4],float b[4][3], float c[3]){int i,j;c[0]=c[1]=c[2]=0.0;// 曲线点for(i=0;i<3;i++)for(j=0;j<4;j++)c[i]+=a[j]*b[j][i];return;}void CBezierView::OnBezier(){CDC *pDC=GetDC();//pDC->TextOut(30,20,"开始绘制3次Bezier曲线,单击左键绘制控制多边形，单击右键绘制曲线");float xx,yy;for(int j=0;j<4;j++) // 绘制控制点{xx=point[j][0];yy=point[j][1];pDC->MoveTo(xx-3,yy-3);pDC->LineTo(xx+3,yy+3);pDC->MoveTo(xx-3,yy+3);pDC->LineTo(xx+3,yy-3);}bezier(pDC,4, T, point);ReleaseDC(pDC);}void CBezierView::OnRButtonDown(UINT nFlags, CPoint point)//调用绘制函数{// TODO: Add your message handler code here and/or call defaultOnBezier();//CBezierView::OnRButtonDown(nFlags, point);}void CBezierView::OnLButtonDown(UINT nFlags, CPoint point1)//获得屏幕控制点坐标{// TODO: Add your message handler code here and/or call default//CBezierView::OnLButtonDown(nFlags, point);CDC *pDC=GetDC();float xx,yy;if(k<4){point[k][0]=point1.x;point[k][1]=point1.y;xx=point[k][0];yy=point[k][1];pDC->MoveTo(xx-3,yy-3);pDC->LineTo(xx+3,yy+3);pDC->MoveTo(xx-3,yy+3);pDC->LineTo(xx+3,yy-3);if(k>=1){pDC->MoveTo(point[k-1][0],point[k-1][1]);pDC->LineTo(xx,yy);}k++;}}// BezierView.h : interface of the CBezierView class///////////////////////////////////////////////////////////////////////////////#if !defined(AFX_BEZIERVIEW_H__8885C30A_7A50_4D01_860B_812CED746C52__INCLUDED_) #define AFX_BEZIERVIEW_H__8885C30A_7A50_4D01_860B_812CED746C52__INCLUDED_#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000class CBezierView : public CView{protected: // create from serialization onlyCBezierView();DECLARE_DYNCREATE(CBezierView)// Attributespublic:CBezierDoc* GetDocument();// Operationspublic:// Overrides// ClassWizard generated virtual function overrides//{{AFX_VIRTUAL(CBezierView)public:virtual void OnDraw(CDC* pDC); // overridden to draw this viewvirtual BOOL PreCreateWindow(CREATESTRUCT& cs);protected:virtual BOOL OnPreparePrinting(CPrintInfo* pInfo);virtual void OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo);virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo);//}}AFX_VIRTUAL// Implementationpublic:virtual ~CBezierView();#ifdef _DEBUGvirtual void AssertValid() const;virtual void Dump(CDumpContext& dc) const;#endifprotected:// Generated message map functionsprotected://{{AFX_MSG(CBezierView)// NOTE - the ClassWizard will add and remove member functions here.// DO NOT EDIT what you see in these blocks of generated code !afx_msg void OnBezier();afx_msg void OnRButtonDown(UINT nFlags, CPoint point);afx_msg void OnLButtonDown(UINT nFlags, CPoint point);//}}AFX_MSGDECLARE_MESSAGE_MAP()};#ifndef _DEBUG // debug version in BezierView.cppinline CBezierDoc* CBezierView::GetDocument(){ return (CBezierDoc*)m_pDocument; }#endif///////////////////////////////////////////////////////////////////////////////{{AFX_INSERT_LOCATION}}// Microsoft Visual C++ will insert additional declarations immediately before the previous line.#endif// !defined(AFX_BEZIERVIEW_H__8885C30A_7A50_4D01_860B_812CED746C52__INCLUDED_)（4）编译运行程序,查看运行结果，如下图单击左键绘制控制多边形，单击右键绘制曲线。
