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這里是用三角函數(shù)畫圓的。代碼如下：

#include

#include

#include

#define WIDTH 250

#define HEIGHT 250

double page=180.00;

double pi=3.14;

int x;

int y;

int a, b, r, color, metric;

void putPoints(int x, int y, int color)

{

int xasp, yasp;

float aspectratio;

getaspectratio(&xasp, &yasp);

aspectratio=xasp/yasp;

putpixel(x+WIDTH, y*aspectratio+HEIGHT,color);

putpixel(y+WIDTH, x*aspectratio+HEIGHT,color);

putpixel(-y+WIDTH, x*aspectratio+HEIGHT,color);

putpixel(-x+WIDTH, y*aspectratio+HEIGHT,color);

putpixel(y+WIDTH, -x*aspectratio+HEIGHT,color);

putpixel(x+WIDTH, -y*aspectratio+HEIGHT,color);

putpixel(-x+WIDTH, -y*aspectratio+HEIGHT,color);

putpixel(-y+WIDTH, -x*aspectratio+HEIGHT,color);

putpixel(-y+WIDTH, -x*aspectratio+HEIGHT,color);

}

void funCircle(int r, int color)

{

for(metric=0;metric<=90;metric++)

{

a=(int)(r*sin((double)metric/page*pi)+0.5);

b=(int)(r*cos((double)metric/page*pi)+0.5);

putPoints(a, b, color);

}

}

void main()

{

int graphdriver, graphmode, errorcode;

printf("Please input R!\n\tR: ");

scanf("%d", &r);

printf("Please input COLOR!\n\tCOLOR: ");

scanf("%d", &color);

graphdriver=DETECT;

graphmode=0;

initgraph(&graphdriver, &graphmode, "D:\\WINYES\\TC20H\\BGI");

errorcode = graphresult();

if (errorcode != grOk)

{

printf("Graphics error:%s\n", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1);

}

cleardevice();

funCircle(r, color);

getch();

closegraph();

}

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