Curve Generation : Bezier for n control points ..

#include <stdio.h>
#include <stdlib.h>
#include <graphics.h>
#include <math.h>

void bezier (int x[4], int y[4])
{

    int i;
    double t;

    for (t = 0.0; t < 1.0; t += 0.0005)
    {
double xt = pow (1-t, 3) * x[0] + 3 * t * pow (1-t, 2) * x[1] +
   3 * pow (t, 2) * (1-t) * x[2] + pow (t, 3) * x[3];

double yt = pow (1-t, 3) * y[0] + 3 * t * pow (1-t, 2) * y[1] +
   3 * pow (t, 2) * (1-t) * y[2] + pow (t, 3) * y[3];

putpixel (xt, yt, WHITE);
    }

    for (i=0; i<4; i++)
putpixel (x[i], y[i], YELLOW);


    return;
}

void main()
{
    int x[4], y[4],x1[4], y1[4],x2[4], y2[4];
    int i,h;

int gd = DETECT, gm;
    initgraph (&gd, &gm, "..\\bgi");

    printf ("Enter the x- and y-coordinates of the four control points.\n");
    for (i=0; i<4; i++)
scanf ("%d%d", &x[i], &y[i]);
    bezier (x, y);

    for (i=0; i<4; i++)
scanf ("%d%d", &x1[i], &y1[i]);
bezier (x1, y1);

for (i=0; i<4; i++)
scanf ("%d%d", &x2[i], &y2[i]);
bezier (x2, y2);

    getch();
    closegraph();
}
Output :-