急急急,高手指点....
#include "graphics.h"#include "display.h"
#include "math.h"
#define N 6
#define UPDRAW(x,y) moveto(x,y)
#define UNDRAW(x,y) lineto(x,y)
void B2_curves(char pflag,long xq[2][2],int m,long lxx,long lyy)
{
int i,j;
long lx1,ly1;
double t0,t1,t2;
lx1=(xq[0][0]+xq[1][0])/2+lxx;
ly1=(xq[0][1]+xq[1][1])/2+lyy;
if(pflag=='p')
{
for(i=1;i<m;i++)
for(j=0;j<=10;j++)
{
t2=1.0*j/10;
t0=1-t2;
t0=0.5*t0*t0;
t1=0.5*(1.0+(2.0-2.0*t2)*t2);
t2=1.0-t0-t1;
lx1=xq[i-1][0]*t0+xq[i][0]*t1+xq[i+1][0]*t2+lxx;
ly1=xq[i-1][1]*t0+xq[i][1]*t1+xq[i+1][1]*t2+lyy;
if(pflag=='p')UNDRAW(lx1,ly1);
}
}
}
void main(void)
{
static long p[N+2][2]={50,400,100,120,260,180,500,120,600,300,590,420,50,400,100,120};
int i, color;
Initialize();
color=WHITE;
setcolor(color);
moveto(p[0][0],p[0][1]);
for(i=1;i<N;i++)
lineto(p[i][0],p[i][1]);
setcolor(BLUE);
B2_curves('p',p,N-1,0,0);
while(getch()!=ESC);
setcolor(RED);
p[0][0]=2*p[0][0]-p[1][0];
p[0][1]=2*p[0][1]-p[1][1];
p[N-1][0]=2*p[N-1][0]-p[N-2][0];
p[N-1][1]=2*p[N-1][1]-p[N-2][1];
B2_curves('p',p,N-1,0,0);
while(getch()!=ESC);
setcolor(GREEN);
p[0][0]=50;
p[0][1]=400;
p[N-1][0]=590; p[N-1][1]=420;
B2_curves('p',p,N+1,0,0);
while(getch()!=ESC);
closegraph();
}
还有一个错误,谁来帮我看看,谢谢
