計(jì)算機(jī)圖形學(xué)實(shí)驗(yàn) 圓的生成算法實(shí)現(xiàn)

PAGEPAGE6實(shí)驗(yàn)三圓的生成算法實(shí)現(xiàn)班級(jí)08信計(jì)學(xué)號(hào)80姓名分?jǐn)?shù)

一、實(shí)驗(yàn)?zāi)康暮鸵螅?、理解圓生成的基本原理2、掌握幾種常見(jiàn)的圓的生成算法3、實(shí)現(xiàn)圓生成的函數(shù)，參數(shù)，中點(diǎn)畫(huà)圓的算法….二、實(shí)驗(yàn)內(nèi)容：1.利用生成圓弧的函數(shù)算法在屏幕上生成圓弧2．利用生成圓弧參數(shù)算法在屏幕上生成圓弧3.利用圓的中點(diǎn)算法在屏幕上生成圓弧4.比較三種算法的優(yōu)缺點(diǎn)（1）實(shí)驗(yàn)代碼：#include"Conio.h"#include"graphics.h"#defineclosegrclosegraph#include"math.h"#definepie3.1415926voidinitgr(void)/*BGI初始化*/{intgd=DETECT,gm=0;/*和gd=VGA,gm=VGAHI是同樣效果*/registerbgidriver(EGAVGA_driver);/*注冊(cè)BGI驅(qū)動(dòng)后可以不需要.BGI文件的支持運(yùn)行*/initgraph(&gd,&gm,"");}voidCirclePoints(intx,inty,intt,ints,intcolor){putpixel(t+x,s+y,color);putpixel(s+y,t+x,color);putpixel(s-y,t+x,color);putpixel(t-x,s+y,color);putpixel(s+y,t-x,color);putpixel(t+x,s-y,color);putpixel(t-x,s-y,color);putpixel(s-y,t-x,color);}voidEllipsePoints(intx,inty,intt,ints,intcolor){putpixel(t+x,s+y,color);putpixel(t-x,s+y,color);putpixel(t+x,s-y,color);putpixel(t-x,s-y,color);}/*開(kāi)平方法生成圓*/voidsqrtCircle(intradius,intcolor){floatx,y;x=0;y=radius;CirclePoints(x,y,100,100,color);while(y>=x){x++;y=sqrt(radius*radius-x*x);CirclePoints((int)(x+0.5),(int)(y+0.5),100,100,color);}outtextxy(50,170,"sqrtCircle");}/*參數(shù)法生成圓*/voidfunCircle(intradius,intcolor){floatx,y,afla;x=radius;y=0;afla=0;CirclePoints(x,y,200,200,color);while(afla<=pie/4){afla+=pie/400;x=radius*cos(afla);y=radius*sin(afla);CirclePoints((int)(x+0.5),(int)(y+0.5),200,200,color);outtextxy(100,250,"funCircle");}}/*Bresenham算法生成圓*/BresenhamCircle(intR,intcolor){intx,y,dD,dHD,dDV,next;x=0;y=R;dD=2*(1-R);while(y>=0){CirclePoints(x,y,300,300,color);if(dD<0){dHD=2*(dD+y)-1;if(dHD<=0)next=0;elsenext=1;}elseif(dD>0){dDV=2*(dD-x)-1;if(dDV<=0)next=1;elsenext=2;}elsenext=1;switch(next){case0:x++;dD+=2*x+1;break;case1:x++;y--;dD+=2*(x-y+1);break;case2:y--;dD+=-2*y+1;break;}/*switch*/}/*while*/outtextxy(150,350,"BresenhamCircle");}/*中點(diǎn)算法生成圓*/voidMidPointCircle(intradius,intcolor){intx,y,d,deltaE,deltaSE;x=0;y=radius;d=5-4*radius;deltaE=12;deltaSE=20-8*radius;CirclePoints(x,y,400,400,color);while(y>x){if(d<=0){d+=deltaE;deltaSE+=8;}else{d+=deltaSE;deltaSE+=16;y--;}deltaE+=8;x++;CirclePoints(x,y,400,400,color);}outtextxy(250,450,"MidPointCircle");}/*開(kāi)平方法生成橢圓*/voidsqrtEllipse(inta,intb,intcolor){floatx,y;x=0;y=b;EllipsePoints(x,y,300,100,color);while(x<a){x++;y=sqrt(b*b-(x*x*b*b)/(a*a));EllipsePoints((int)(x+0.5),(int)(y+0.5),300,100,color);}outtextxy(350,100,"sqrtEllipse");}/*參數(shù)法生成橢圓*/voidfunEllipse(inta,intb,intcolor){floatx,y,afla;x=a;y=0;afla=0;EllipsePoints(x,y,400,200,color);while(afla<=pie/2){afla+=pie/400;x=a*cos(afla);y=b*sin(afla);EllipsePoints((int)(x+0.5),(int)(y+0.5),400,200,color);}outtextxy(450,200,"funEllipse");}/*中點(diǎn)算法生成橢圓*/voidMidPointEllipse(doublea,doubleb,intcolor){doublex,y,d,xP,yP,squarea,squareb;squarea=a*a;squareb=b*b;xP=(int)(0.5+(double)squarea/sqrt((double)(squarea+squareb)));yP=(int)(0.5+(double)squareb/sqrt((double)(squarea+squareb)));x=0;y=b;d=4*(squareb-squarea*b)+squarea;EllipsePoints(x,y,500,300,color);while(x<=xP){if(d<=0)d+=4*squareb*(2*x+3);else{d+=4*squareb*(2*x+3)-8*squarea*(y-1);y--;}x++;EllipsePoints(x,y,500,300,color);}x=a;y=0;d=4*(squarea-a*squareb)+squareb;EllipsePoints(x,y,500,300,color);while(y<yP){if(d<=0)d+=4*squarea*(2*y+3);else{d+=4*squarea*(2*y+3)-8*squareb*(x-1);x--;}y++;EllipsePoints(x,y,500,300,color);}outtextxy(480,380,"MidPointsEllipse");}intmain(void){initgr();/*BGI初始化*//*****此部分添加你自己的代碼，例如line(25,25,220,220);circle(100,100,50);等等*****/sqrtCircle(50,105);funCircle(50,5);BresenhamCircle(50,35);MidPointCircle(50,255);sqrtEllips