在tc下,用中点画圆法如何画出一个圆,我做了老半天,只能画出1/8圆,希望大家能帮我解答啊,谢谢,程序如下:
#include<stdio.h>
#include<graphics.h>
void MidPointCircle(int r,int color);
void CirclePoints(int x,int y,int color);
main()
{
int gdriver=DETECT, gmode;
initgraph(&gdriver, &gmode," ");
setbkcolor(WHITE);
MidPointCircle(1,BLUE);
getch();
closegraph();
}
void MidPointCircle(int r,int color)
{
int x,y;
float d;
x=0;y=r;d=1.25-r;
CirclePoints(x,y,color);
while(x<=y)
{
if(d<0)
d+=2*x+3;
else
{d+=2*(x-y)+5;y--;}
x++;
putpixel(x,y,color);
}
}
void CirclePoints(int x,int y,int color)
{
putpixel(x,y,color);putpixel(y,x,color);
putpixel(-x,y,color);putpixel(y,-x,color);
putpixel(x,-y,color);putpixel(-y,x,color);
putpixel(-x,-y,color);putpixel(-y,-x,color);
}

#include<graphics.h>
int main()
{
int gd=DETECT,gm;

initgraph(&gd,&gm,"");
circle(x,y,radius); //x,y代表坐标，radius代表半径
getch();
closegraph();
return 0;
}

#include<stdio.h>
#include<graphics.h>
void MidPointCircle(int r,int color);
void CirclePoints(int x,int y,int color);
void main()
{
int gdriver=DETECT, gmode;

initgraph(&gdriver, &gmode," ");
setbkcolor(BLACK);
MidPointCircle(100,BLUE); /*下次画圆半径大点，你给的半径真夸张*/
getch();
closegraph();
}

void MidPointCircle(int r,int color)
{
int x,y;
float d;

x=0;
y=r;
d=1.25-r;
CirclePoints(x,y,color);
while(x<y)
{
if(d<0)
d+=2*x+3;
else
{
d+=2*(x-y)+5;
y--;
}
x++;
CirclePoints(x,y,color); /*重点是这里*/
}
}

void CirclePoints(int x,int y,int color) /*圆心为（320，240）*/
{
putpixel(320+x,240+y,color);
putpixel(320+y,240+x,color);
putpixel(320-x,240+y,color);
putpixel(320+y,240-x,color);
putpixel(320+x,240-y,color);
putpixel(320-y,240+x,color);
putpixel(320-x,240-y,color);
putpixel(320-y,240-x,color);
}

希望楼主能够加分给这个为我解答问题的人