DDA、Bresenham、Midpoint算法画直线报告1.doc

南华大学计算机科学与技术学院 实验报告课程名称 计算机图形学实验名称DDA、Bresenham、Midpoint算法画直线一、实验目的及要求（1）理解窗口到视区的变换 （2）理解MFC创建工程实现动画的原理 (3) 学习MFC类库的概念与结构 （4）学习使用VC+编写Win32应用的方法（单文档，多文档，对话框）（5）学习使用MFC的图形编程软件环境：Microsoft studio visual C+ 6.0 MFC硬件：计算机二、实验内容（1）添加代码实现DDA算法画直线 （2）添加代码实现Bresenham算法画直线 （3）添加代码实现Midpointline画直线 (4) 添加代码实现画圆三、实验步骤 选择工作环境添加工程名选择程序类型 前几步省略全选默认值 选择resource-Menu添加不同函数画直线和圆 为每个函数建立类向导在fileview中打开source filesview.cpp输入各函数代码并编译运行无误四、实验源码/ 直线和圆View.cpp : implementation of the CMyView class/#include stdafx.h#include 直线和圆.h#include 直线和圆Doc.h#include 直线和圆View.h#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE = _FILE_;#endif/ CMyViewIMPLEMENT_DYNCREATE(CMyView, CView)BEGIN_MESSAGE_MAP(CMyView, CView)/AFX_MSG_MAP(CMyView)ON_COMMAND(ID_DDALINE, OnDdaline)ON_COMMAND(ID_MIDPOINTLINE, OnMidpointline)ON_COMMAND(ID_BRESENHAMLINE, OnBresenhamline)ON_COMMAND(ID_MIDPOINTCIRCLE, OnMidpointcircle)/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()/ CMyView construction/destructionCMyView:CMyView()/ TODO: add construction code hereCMyView:CMyView()BOOL CMyView:PreCreateWindow(CREATESTRUCT& cs)/ TODO: Modify the Window class or styles here by modifying/ the CREATESTRUCT csreturn CView:PreCreateWindow(cs);/ CMyView drawingvoid CirclePoints(int x,int y,int color ,CDC* pDC )pDC-SetPixel(x,y,color);pDC-SetPixel(y,x,color);pDC-SetPixel(-x,y,color);pDC-SetPixel(y,-x,color);pDC-SetPixel(x,-y,color);pDC-SetPixel(-y,x,color);pDC-SetPixel(-x,-y,color);pDC-SetPixel(-y,-x,color);void Midpointcircle(int r,int color,CDC* pDC)int x,y;float d;x=0;y=r;d=1.25-r;CirclePoints(x,y,color,pDC);pDC-SetViewportOrg(200,100);while(x=y)if(d0)d+=2*x+3;else d+=2*(x-y)+5; y-;x+;CirclePoints(x,y,color,pDC);void DDA(int x0,int y0,int x1,int y1,int color,CDC* pDC)int x;float dx,dy,y,k;dx=x1-x0;dy=y1=y0;k=dy/dx;y=y0;for(x=x0;xSetPixel(x,int (y+0.5), color);y=y+k;void Bresenhamline(int x0,int y0,int x1,int y1,int color,CDC* pDC) int x,y,dx,dy;float k,e;dx=x1-x0;dy=y1-y0 ;k=dy/dx;e=-0.5;x=x0;y=y0;for(int i=0;iSetPixel(x,y,color); x=x+1;e=e+k; if(e=0) y+;e=e-1;void Midpointline(int x0,int y0,int x1,int y1,int color,CDC* pDC)int a,b,d1,d2,d,x,y;a=y0-y1;b=x1-x0;d=2*a+b;d1=2*a;d2=2*(a+b);x=x0;y=y0;pDC-SetPixel(x,y,color);while (xx1)if(dSetPixel(x,y,color);void CMyView:OnDraw(CDC* pDC)CMyDoc* pDoc = GetDocument();ASSERT_VALID(pDoc); Midpointcircle(100,RGB(0,168,168),pDC) ;DDA(0,0, 250,300,RGB (255,0,255),pDC); Midpointline(0,0, 500,200,RGB (255,255,0),pDC); Bresenhamline(0,0, 150,600,RGB (168,200,168),pDC);/ TODO: add draw code for native data here/ CMyView printingBOOL CMyView:OnPreparePrinting(CPrintInfo* pInfo)/ default preparationreturn DoPreparePrinting(pInfo);void CMyView:OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)/ TODO: add extra initialization before printingvoid CMyView:OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)/ TODO: add cleanup after printing/ CMyView diagnostics#ifdef _DEBUGvoid CMyView:AssertValid() constCView:AssertValid();void CMyView:Dump(CDumpContext& dc) constCView:Dump(dc);CMyDoc* CMyView:GetDocument() / non-debug version is inlineASSERT(m_pDocument-IsKindOf(RUNTIME_CLASS(CMyDoc);return (CMyDoc*)m_pDocument;#endif /_DEBUG/ CMyView message handlersvoid CMyView:OnDdaline() / TODO: Add your command handler code herevoid CMyView:OnMidpointline() / TODO: Add your command handler code herevoid CMyView:OnBresenhamline() / TODO: Add your command handler code herevoid CMyView:OnMidpointcircle() / TODO: Add your command handler co