动态绘制bezier曲线.docx

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 hereCBezierView: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 printingvoid CBezierView:OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)/ TODO: add cleanup after printing/ CBezierView diagnostics#ifdef _DEBUGvoid CBezierView:AssertValid() constCView:AssertValid();void CBezierView:Dump(CDumpContext& dc) constCView:Dump(dc);CBezierDoc* CBezierView:GetDocument() / non-debug version is inlineASSERT(m_pDocument-IsKindOf(RUNTIME_CLASS(CBezierDoc);return (CBezierDoc*)m_pDocument;#endif /_DEBUG/ CBezierView message handlersint k=0;float BEN44=-1,3,-3,1, 3,-6,3,0, -3,3,0,0, 1,0,0,0; float point43 =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 p43);void matx44(float a44,float b43,float c43);void matx14(float a4,float b43, float c3);void bezier (CDC*pDC,int n,int t, float point43) /绘制Bezier曲线float cc43;float pp3;int i,xx,yy,a,b;float u4;u3=1.0; a=point00,b=point01; / 第一个控制点的横、纵坐标for(i=2;iMoveTo(a,b);pDC-LineTo(xx,yy);a=xx;b=yy;void matx44(float a44,float b43,float c43) int i,j,m;for(i=0;i4;i+)for(j=0;j3;j+) cij=0.0; /初始化中间矩阵for(m=0;m4;m+)for(i=0;i3;i+)for(j=0;j4;j+)cmi+=amj*bji;return;void matx14(float a4,float b43, float c3) int i,j;c0=c1=c2=0.0;/ 曲线点for(i=0;i3;i+)for(j=0;jTextOut(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;jMoveTo(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(kMoveTo(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(pointk-10,pointk-11);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 CViewprotected: / 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_msgvoid OnRButtonDown(UINT nFlags, CPoint point);afx_msgvoid OnLButtonDown(UINT nFlags, CPoint point);/AFX_MSGDECLARE_MESSAGE_MAP();#ifndef _DEBUG / debug version in BezierView.cppinline CBezierDoc* CBezierView:GetDocument() return (CBezierDo