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#include<Gl/glut.h>

typedef float point2[2];

point2 v[] = { {-1.0, -0.58}, {1.0, -0.58}, {0.0, 1.15} };

int n;

void triangle(point2 a, point2 b, point2 c);
void divside_triangle(point2 a, point2 b, point2 c, int m);
void display(void);
void myinit();

void triangle(point2 a, point2 b, point2 c)
{
        glBegin(GL_TRIANGLES);
                glVertex2fv(a);
                glVertex2fv(b);
                glVertex2fv(c);
        glEnd();
}

void divside_triangle(point2 a, point2 b, point2 c, int m)
{
        point2 v0, v1, v2;
        int j;
        if(m>0)
        {
                for(j=0; j<2; j++) v0[j] = (a[j]+b[j]) / 2;
                for(j=0; j<2; j++) v1[j] = (a[j]+c[j]) / 2;
                for(j=0; j<2; j++) v2[j] = (b[j]+c[j]) / 2;
                divside_triangle(a, v0, v1, m-1);
                divside_triangle(c, v1, v2, m-1);
                divside_triangle(b, v2, v0, m-1);
        }
        else(triangle(a,b,c));
}

void display(void)
{
        glClear(GL_COLOR_BUFFER_BIT);
        divside_triangle(v[0], v[1], v[2], n);
        glFlush();
}

void myinit()
{
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluOrtho2D(-2.0, 2.0, -2.0, 2.0);
        glMatrixMode(GL_MODELVIEW);
        glClearColor(1.0, 1.0, 1.0, 1.0);
        glColor3f(0.0, 0.0, 0.0);
}

void main(int argc, char **argv)
{
        n = 5;//atoi(argv[1]);
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
        glutInitWindowSize(500, 500);
        glutCreateWindow("3D Gasket");
        glutDisplayFunc(display);
        myinit();
        glutMainLoop();
}


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