实验1：Bresenham算法.doc

// eView.cpp : implementation of the CEView class // #include stdafx.h #include e.h #include eDoc.h #include eView.h #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CEView IMPLEMENT_DYNCREATE(CEView, CView) BEGIN_MESSAGE_MAP(CEView, CView) //{{AFX_MSG_MAP(CEView) // NOTE - the ClassWizard will add and remove mapping macros here. // DO NOT EDIT what you see in these blocks of generated code! //}}AFX_MSG_MAP // Standard printing commands ON_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() ///////////////////////////////////////////////////////////////////////////// // CEView construction/destruction CEView::CEView() { // TODO: add construction code here } CEView::~CEView() { } BOOL CEView::PreCreateWindow(CREATESTRUCT cs) { // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return CView::PreCreateWindow(cs); } ///////////////////////////////////////////////////////////////////////////// // CEView drawing void Bresenhamline(int x1, int y1, int x2, int y2,CDC *pDC) { //对于所有直线均按照从左至右的方向绘制 int x,y,dy,dx,right,rightleft,d; if(x1x2){ int tempx,tempy; tempx=x1;x1=x2;x2=tempx; tempy=y1;y1=y2;y2=tempy; } //根据斜率的情况不同而绘制 if(y1==y2){//斜率为0的情况 for(x=x1;x=x2;x++) pDC-SetPixel(x,y1,2); } else if(x1==x2){//直线为垂直的情况 if(y1y2){ //使直线按从下往上画 int tempy=y1; y1=y2;y2=tempy; } for(y=y1;y=y2;y++) pDC-SetPixel(x1,y,2); } else{ dy=y2-y1; dx=x2-x1; if(abs(dy)==abs(dx)){////斜率为1或-1时 x=x1;y=y1; if(dy0){//斜率为1 for(;y=y2;y--){ x++; pDC-SetPixel(x,y,2); } }//斜率为1 else{//斜率为-1 for(;y=y2;y++){ x++; pDC-SetPixel(x,y,2); } }//斜率为-1 } else if(abs(dy)abs(dx)){//斜率的绝对值小于1时 if(dy0dx0){//斜率为正时 right=-2*d