C语言生成Bezier曲线程序

#include
void bezier_3(int color, double p[4][2])
{
    double t,t1,t2,xt,yt;
    int rate=200,x,y;
    setcolor(color);
    moveto(p[0][0],p[0][1]);
    for (t=0;t<=1;t+=1.0/rate)
    {
        yt=1-t;
 t1=yt*yt;
 t2=3*yt*t;
        xt=p[0][0]*t1*yt+p[1][0]*t2*yt+p[2][0]*t2*t+p[3][0]*t*t*t;
        yt=p[0][1]*yt*t1+p[1][1]*t2*yt+p[2][1]*t2*t+p[3][1]*t*t*t;
        x=(int)(xt);
        y=(int)(yt);
        lineto(x,y);
    }
}
void main()
{
    static double p[4][2]={50,400,140,20,400,40,635,420};
    const NO=3;           /*特征顶点数*/
    int i;
    int driver=DETECT,mode;
    initgraph(&driver,&mode,"C://tools/tc2.0");
    cleardevice();
    setcolor(BLUE);
    moveto(p[0][0],p[0][1]);
    for (i=1;i    lineto(p[i][0],p[i][1]);
    bezier_3(LIGHTRED,p);
    getch();           /*按ESC键退出*/
    closegraph();
}