#include"graphics.h"
void MidpointLine(int x0,int y0,int x1,int y1,int color)
{
    int a,b,dalte1,dalte2,d,x,y;
    a=y0-y1;
    b=x1-x0;
    dalte1=a+a;
    dalte2=a+a+b+b;
    d=a+a+b;
    x=x0;
    y=y0;
    putpixel(x,y,color);
    while(x0<x1)
    {
        if(d<0)
        {
            x++;
            y++;
            d+=dalte2;
        }
        else
        {
            x++;
            d+=dalte1;
        }
    }
    putpixel(x,y,color);
}/*中点画线法函数*/
main()
{
int a,b,c,d,e;
int graphdriver=DETECT;
int graphmode=0;
initgraph(&graphdriver,&graphmode," ");
cleardevice();
a=0;
b=0;
c=300;
d=200;
e=2;
MidpointLine(a,b,c,d,e);
getch();
closegraph();
}

[ 本帖最后由 火男 于 2010-12-5 21:24 编辑 ]

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