// cc -Wall triangle.c -o traingle -lGL -lGLU -lglut -lm -lX11 -L /usr/X11R6/lib; ./traingle
#include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>

#define TRUE  1
#define FALSE 0
#define drawOneLine(x1, y1, x2, y2) glBegin(GL_LINES); \
    glVertex2f((x1), (y1)); glVertex2f((x2), (y2)); glEnd( );


GLint j;
bool row[100]      = [];
bool next_row[100] = [];
void display( );


bool rule(bool left, bool top, bool right)
{
    if(left & right)
    {
        return FALSE;
    }
    else if (left & top & right)
    {
        return FALSE;
    }
    else if (left & top)
    {
        return FALSE;
    }
    else if (!top & !left & !right)
    {
        return FALSE;
    }
    return TRUE;
}

void display(void)
{
    int i,k;

    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(0.0f, 0.0f, 0.0f);
    glPointSize(2.0);
    glBegin(GL_POINTS);
        for(i = 0; i < 100; i++)
        {
            for(k=0; k < j; k++)
            {
                if(row[i])
                    glVertex3f(1-i*0.025, 5-k*0.025, 0.0);
            }
        }
    glEnd( );

    for(i = 0; i < 100; i++) 
    {
        if(i == 0)
        {
            next_row[i] = rule(FALSE, row[i], row[i+1]);
        }
        else if(i == 100)
        {
            next_row[i] = rule(row[i-1], row[i], FALSE);
        }
        else
        {
            next_row[i] = rule(row[i-1], row[i], row[i+1]);
        }
    }
    for(i = 0; i < 100; i++)
    {
        row[i] = next_row[i];
    }

/*    glBegin(GL_TRIANGLES);*/
/*        glVertex3f(0.5, 0.5, 0.0);*/
/*        glVertex3f(0.5, 0.0, 0.0);*/
/*        glVertex3f(0.0, 0.5, 0.0);*/
/*    glEnd( );*/

/*    glTranslatef(t, -t, t);*/
/*    glBegin(GL_POLYGON);*/
/*        glColor3f(1.0f, 0.0f, 1.0f);*/
/*        glVertex3f(0.0f, 0.0f, 0.0f);*/

/*        glColor3f(0.0f, 1.0f, 1.0f);*/
/*        glVertex3f(1.0f, 0.0f, 0.0f);*/

/*        glColor3f(1.0f, 1.0f, 0.0f);*/
/*        glVertex3f(1.0f, 1.0f, 0.0f);*/

/*        glColor3f(0.0f, 0.0f, 0.0f);*/
/*        glVertex3f(0.0f, 1.0f, 0.0f);*/
/*    glEnd( );*/

    glutSwapBuffers( );
    glutPostRedisplay( );
    j++;
/*    printf("%f\n", t);*/
}

void init(void)
{
    int i;
    glClearColor(1.0, 1.0, 1.0, 0.0);
    glMatrixMode(GL_PROJECTION);
    glOrtho(0.0, 125.0, 0.0, 125.0, 0.0, 125.0);
    glLoadIdentity( );
    j = 0;
    for(i=0; i<100; i++)
    {
        row[i]      = FALSE;
        next_row[i] = FALSE;
    }
    row[50] = TRUE;
}

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowSize(250,250);
    glutInitWindowPosition(100, 100);
    glutCreateWindow("Hello");
    init( );
    glutDisplayFunc(display);
/*    glutIdleFunc(display);*/
    glutMainLoop( );
    return 0;
}