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| #include <stdio.h>
#include <stdlib.h>
#include <graphics.h>
#include <math.h>
void bezier (int x[4], int y[4])
{
int gd = DETECT, gm;
int i;
double t;
initgraph (&gd, &gm, "..\\bgi");
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);
getch();
closegraph();
return;
}
void main()
{
int x[4], y[4];
int i;
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);
} |

#include <stdio.h>
#include <stdlib.h>
#include <graphics.h>
#include <math.h>
void bezier (int x[4], int y[4])
{
int gd = DETECT, gm;
int i;
double t;
initgraph (&gd, &gm, "..\\bgi");
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);
getch();
closegraph();
return;
}
void main()
{
int x[4], y[4];
int i;
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);
}

###### Editorial Team

We are a group of young techies trying to provide the best study material for all Electronic and Computer science students. We are publishing Microcontroller projects, Basic Electronics, Digital Electronics, Computer projects and also c/c++, java programs.

Cubic Bezier curve

#include

#include

int X()

{

int x;

printf(“\nEnter the value of x: “);

scanf(“%d”,&x);

return x;

}

int Y()

{

int y;

printf(“\nEnter the value of y: “);

scanf(“%d”,&y);

return y;

}

float Square(float u)

{

return (u*u);

}

float Cube(float u)

{

return (u*u*u);

}

int main()

{

int x1,x2,x3,x4,y1,y2,y3,y4;

float u=0.0,x,y,v1,v2,v3,v4;

int gd=DETECT,gm;

x1=X();

y1=Y();

x2=X();

y2=Y();

x3=X();

y3=Y();

x4=X();

y4=Y();

initgraph(&gd,&gm,NULL);

for(u=0.0;u<1.0;++u)

{

v1=Cube(1-u);

v2=3*Square(1-u);

v3=(1-u)*Square(1-u);

v4=Cube(u);

x=(x1*v1)+(x2*v2)+(x3*v3)+(x4*v4);

y=(y1*v1)+(y2*v2)+(y3*v3)+(y4*v4);

putpixel(x,y,7);

delay(500);

}

//closegraph();

getch();

return 0;

}

Error occured.

I solved errors still output is not generating.

wer is the pow function in the program