計算機圖形學實驗報告

計算機圖形學實驗報告計算機圖形學實驗報告學號：姓名：預定義庫函數(shù)*/voidcirclePoint(intx,inty)/*八分法畫圓程序*/{circle(320+x*20,240+y*20,3);circle(320+y*20,240+x*20,3);circle(320-y*20,240+x*20,3);circle(320-x*20,240+y*20,3);circle(320-x*20,240+y*20,3);circle(320-x*20,240-y*20,3);circle(320-y*20,240-x*20,3);circle(320+y*20,240-x*20,3);circle(320+x*20,240-y*20,3);}voidMidBresenhamcircle(intr)/*中點Bresenham算法畫圓的程序*/{intx,y,d;x=0;y=r;d=1-r;/*計算初始值*/while(x<y){circlePoint(x,y);/*繪制點(x,y)及其在八分圓中的另外7個對稱點*/if(d<0)d+=2*x+3;/*根據(jù)誤差項d的判定,決定非最大位移方向上是走還是不走*/else{d+=2*(x-y)+5;y--;}x++;delay(900000);}/*while*/}main(){inti,j,r,graphmode,graphdriver;detectgraph(&graphdriver,&graphmode);initgraph(&graphdriver,&graphmode,"");printf("中點Bresenhamcircle算法畫圓的程序\n");/*提示信息*/printf("注重|r|<=11");printf("\n輸入半徑值r:");scanf("%d",&r);printf("按任意鍵顯示圖形...");getch();cleardevice();setbkcolor(BLACK);for(i=20;i<=620;i+=20)/*使用雙循環(huán)畫點函數(shù)畫出表格中的縱坐標*/for(j=20;j<=460;j++)putpixel(i,j,2);for(j=20;j<=460;j+=20)/*使用雙循環(huán)畫點函數(shù)畫出表格中的橫坐標*/for(i=20;i<=620;i++)putpixel(i,j,2);outtextxy(320,245,"0");/*原點坐標*/outtextxy(320-5*20,245,"-5");circle(320-5*20,240,2);/*橫坐標值*/outtextxy(320+5*20,245,"5");circle(320+5*20,240,2);outtextxy(320-10*20,245,"-10");circle(320-10*20,240,2);outtextxy(320+10*20,245,"10");circle(320+10*20,240,2);outtextxy(320-15*20,245,"-15");circle(320-15*20,240,2);outtextxy(320+15*20,245,"15");circle(320+15*20,240,2);outtextxy(320,240-5*20,"-5");circle(320,240-5*20,2);/*縱坐標值*/outtextxy(320,240+5*20,"5");circle(320,240+5*20,2);outtextxy(320,240-10*20,"-10");circle(320,240-10*20,2);outtextxy(320,240+10*20,"10");circle(320,240+10*20,2);outtextxy(20,10,"Thecenterofthecircleis(0,0)");/*坐標軸左上角顯示提示信息*/setcolor(RED);/*標記坐標軸*/line(20,240,620,240);outtextxy(320+15*20,230,"X");line(320,20,320,460);outtextxy(330,20,"Y");setcolor(YELLOW);MidBresenhamcircle(r);setcolor(BLUE);/*繪制圓*/circle(320,240,r*20);setcolor(2);getch();closegraph();}Bezier曲線#include<windows.h>#include<stdlib.h>#include<time.h>#defineNUM10LRESULTCALLBACKWinproc(HWND,UINT,WPARAM,LPARAM);intWINAPIWinMain(HINSTANCEhInstance,HINSTANCEhPrevInstanc,LPSTRlpCmdLine,intnShowCmd){MSGmsg;staticTCHARszClassName[]=TEXT;HWNDhwnd;WNDCLASSwc;wc.cbClsExtra=0;wc.cbWndExtra=0;wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);wc.hCursor=LoadCursor(NULL,IDC_ARROW);wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);wc.hInstance=hInstance;wc.lpfnWndProc=Winproc;wc.lpszClassName=szClassName;wc.lpszMenuName=NULL;wc.style=CS_HREDRAW|CS_VREDRAW;if(!RegisterClass(&wc)){MessageBox(NULL);return0;}hwnd=CreateWindow(szClassName,szClassName,WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);ShowWindow(hwnd,SW_SHOWMAXIMIZED);UpdateWindow(hwnd);while(GetMessage(&msg,NULL,0,0)){TranslateMessage(&msg);DispatchMessage(&msg);}returnmsg.wParam;}LRESULTCALLBACKWinproc(HWNDhwnd,UINTmessage,WPARAMwparam,LPARAMlparam){PAINTSTRUCTps;HDChdc;staticPOINTpt[NUM];TEXTMETRICtm;staticintcxClient,cyClient;HPENhpen;inti,j,k,n,t;switch(message){caseWM_CREATE:staticintcxchar;hdc=GetDC(hwnd);GetTextMetrics(hdc,&tm);cxchar=tm.tmAveCharWidth;ReleaseDC(hwnd,hdc);caseWM_SIZE:cxClient=LOWORD(lparam);cyClient=HIWORD(lparam);return0;caseWM_PAINT:hdc=GetDC(hwnd);srand(time(0));Rectangle(hdc,0,0,cxClient,cyClient);for(i=0;i<500;i++){SelectObject(hdc,GetStockObject(WHITE_PEN));PolyBezier(hdc,pt,NUM);for(j=0;j<NUM;j++){pt[j].x=rand()%cxClient;pt[j].y=rand()%cyClient;}hpen=CreatePen(PS_INSIDEFRAME,3,RGB(rand()%256,rand()%256,rand()%256));DeleteObject(SelectObject(hdc,hpen));PolyBezier(hdc,pt,NUM);for(k=0;k<50000000;k++);}for(i=0;i<100;i++){Ellipse(hdc,rand()%cxClient,rand()%cyClient,rand()%cxClient,rand()%cyClient);}if((n=(n+j)/2)>cxchar*20)n=cxchar*20;SetTextColor(hdc,RGB(rand()%256,rand()%256,rand()%256));TextOut(hdc,n/2,(t+k)/2,);ReleaseDC(hwnd,hdc);DeleteObject(hpen);ValidateRect(hwnd,NULL);return0;caseWM_DESTROY:PostQuitMessage(0);return0;}returnDefWindowProc(hwnd,message,wparam,lparam);}編碼裁剪算法#include<stdio.h>#include<graphics.h>#defineLEFT1#defineRIGHT2#defineBOTTOM4#defineTOP8#defineFALSE0#defineTRUE1voidLine_Clipping(x1,y1,x2,y2,xw_xmin,yw_ymin,xw_xmax,yw_ymax)floatx1,y1,x2,y2,xw_xmin,yw_ymin,xw_xmax,yw_ymax;{intdraw,done;intcode1,code2,code;floatx,y;draw=FALSE;done=FALSE;code1=get_code(x1,y1,xw_xmin,yw_ymin,xw_xmax,yw_ymax);code2=get_code(x2,y2,xw_xmin,yw_ymin,xw_xmax,yw_ymax);while(!done){if(code1==0&&code2==0){draw=TRUE;done=TRUE;}elseif(code1&code2!=0){done=TRUE;}else{if(code1!=0)code=code1;elsecode=code2;if((code&TOP)!=0){y=yw_ymax;x=x1+(y-y1)*(x2-x1)/(y2-y1);}elseif((code&BOTTOM)!=0){y=yw_ymin;x=x1+(y-y1)*(x2-x1)/(y2-y1);}elseif((code&RIGHT)!=0){x=xw_xmax;y=y1+(x-x1)*(y2-y1)/(x2-x1);}elseif((code&LEFT)!=0){x=xw_xmin;y=y1+(x-x1)*(y2-y1)/(x2-x1);}if(code==code1){x1=x;y1=y;code1=get_code(x1,y1,xw_xmin,yw_ymin,xw_xmax,yw_ymax);}else{x2=x;y2=y;code2=get_code(x2,y2,xw_xmin,yw_ymin,xw_xmax,yw_ymax);}}if(draw){s