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怎样用C语言画圆?
#include math.h
#include graphics.h /*预定义库函数*/
void circlePoint(int x,int y) /*八分法画圆程序*/
{
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);
}
void MidBresenhamcircle(int r) /* 中点Bresenham算法画圆的程序 */
{
int x,y,d;
x=0;y=r;d=1-r; /* 计算初始值 */
while(xy)
{ circlePoint(x,y); /* 绘制点(x,y)及其在八分圆中的另外7个对称点 */
if(d0) d+=2*x+3; /* 根据误差项d的判断,决定非最大位移方向上是走还是不走 */
else
{ d+=2*(x-y)+5;
y--;
}
x++;
delay(900000);
} /* while */
}
main()
{
int i,j,r,graphmode,graphdriver;
detectgraph(graphdriver,graphmode);
initgraph(graphdriver,graphmode," ");
printf("中点Bresenhamcircle算法画圆的程序\n"); /*提示信息*/
printf("注意 |r|=11");
printf("\n输入半径值 r:");
scanf("%d",r);
printf("按任意键显示图形...");
getch();
cleardevice();
setbkcolor(BLACK);
for(i=20;i=620;i+=20) /*使用双循环画点函数画出表格中的纵坐标*/
for(j=20;j=460;j++)
putpixel(i,j,2);
for(j=20;j=460;j+=20) n欢迎光临学网,收藏本篇文章 [1] [2]
$False$
bsp; /*使用双循环画点函数画出表格中的横坐标*/
for(i=20;i=620;i++)
putpixel(i,j,2);
outtextxy(320,245,"0"); /*原点坐标*/
outtextxy(320-5*20,245,"-5");circle(320-5*20,240,2); /*横坐标值*/
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); /*纵坐标值*/
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,"The center of the circle is (0,0) "); /*坐标轴左上角显示提示信息*/
setcolor(RED); /*标记坐标轴*/
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); /*绘制圆*/
circle(320,240,r*20);
setcolor(2);
getch();
closegraph();
}
C语言怎么画圆
#include math.h#include stdio.h#define R 10 //半径 #define X 10 //圆心x坐标 #define Y 10 //圆心Y坐标 int main(void)
{ int x,y; int m; int i; for(i=Y-R;i=1;i--)
{ printf("\n");
}
for(y=R;y=-R;y--)
{
m=2*sqrt(R*R - y*y); //横坐标的偏移量,因为字体长宽比例为2,所以要乘2
for(x=1;xX+R-m;x++) //打印左半圆
{ printf(" ");
} printf("*"); for(;xX+R+m;x++) //打印右半圆
{ printf(" ");
} printf("*\n");
}
}
怎样用c语言画一个圆?可以访问graphics.h库!circle函数怎样用?
graphics.h 是 tc 下的,vc 下你安装了 easyx 也就有了,然后画圆这样:
#include graphics.h // 引用图形库
#include conio.h
void main()
{
initgraph(640, 480); // 初始化图形窗口
circle(100, 100, 60); // 画圆,圆心(100, 100),半径 60
getch(); // 按任意键继续
closegraph(); // 关闭图形界面
}