#include <GL/glut.h>    /*??? Linux ? Windows*/
#include <stdio.h>
#include <math.h>
float a = 0;


void reshape(int w, int h)
{
        glViewport(0, 0, w, h);

        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluOrtho2D(0, w, 0, h);

        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
}

float xi0 = 20, xi = 0;
float yi0 = 4, yi = 0;
float vx0 = 0, vy0 =40;
float t = 0;
float ax[2][2]={{0, 10},{10, 10}};
float ay[2][2]={{0,-5},{10, -30}};
int akold = 0;
int abold = 0;
void display()
{
      //glClear(GL_COLOR_BUFFER_BIT);
    glLoadIdentity();

    glTranslatef(400, 400, 0);
    glPointSize(1);
    glLineWidth(1);
    int ak1 = xi/100;
    int ab1 = yi/100;

    if((ak1 != akold) || (ab1 != abold)){
        xi0 = xi;
        yi0 = yi;
        vx0 = vx0 + ax[ak1][ab1]*t;
        vy0 = vy0 + ay[ak1][ab1]*t;
        t = 0;
        akold = ak1;
        abold = ab1;
    }
    printf("%d %d\n", ak1,ab1);

        xi = xi0 + vx0*t + ax[ak1][ab1]*t*t/2.0;
        yi = yi0 + vy0*t + ay[ak1][ab1]*t*t/2.0;
        glBegin(GL_POINTS);
            glColor3d(1,1,0);
            glVertex3d(xi,yi,0);
        glEnd();
        glBegin(GL_LINES);
            glColor3d(0,1,0);


            glVertex3d(0,0,0);
            glVertex3d(200,0,0);

            glColor3d(0,1,0);

             glVertex3d(0,100,0);
               glVertex3d(200,100,0);

                          glColor3d(0,1,0);


                 glVertex3d(0,200,0);
                              glVertex3d(200,200,0);

                        glColor3d(0,1,0);
                                 glVertex3d(0,0,0);
                                 glVertex3d(0,200,0);
                               glColor3d(0,1,0);


                                                       glVertex3d(100,0,0);
                                              glVertex3d(100,200,0);

                                                        glColor3d(0,1,0);

                                                          glVertex3d(200,0,0);
                                                    glVertex3d(200,200,0);




       glEnd();
        t+=0.01;
        glutSwapBuffers();

}

int main (int argc, char * argv[])
{

        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA);

        glutInitWindowSize(800, 600);
        glutCreateWindow("OpenGL lesson 1");

        glutReshapeFunc(reshape);
        glutDisplayFunc(display);

	    glutIdleFunc(display);

        glutMainLoop();

        return 0;
}