/* Rafael de Luna Galdino RA 072135 , UNICAMP-2010 */

#include <stdlib.h>
#include <GL/glut.h>

//coordenada y
GLint y1 = 1;
GLint height = 80;


GLint x = 11;
GLint inc = 5;

int cont_numquads = 0;
GLint vet_posy[10];

//condicao
int inicio = 1;

int direcao[10];
void init(void);
void criaQuads(int x1, int y1, float corR, float corG, float corB);
void display(void);
void move(int passo);
void keyboard(unsigned char key, int x, int y);


int main(int argc, char** argv){
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
  glutInitWindowSize (180, 100);
  glutInitWindowPosition (100, 100);
  glutCreateWindow ("rOLAAAA");
  init();
  glutDisplayFunc(display);
  glutKeyboardFunc(keyboard);

  glutMainLoop();
  return 0;
}

void init(void)
{
     int i;

     glClearColor(0.0, 0.0, 0.0, 0.0);
     glOrtho (0, 180, 0, 100, -1 ,1);

     for (i = 0; i < 10; ++i)
     {
         direcao[i] = inicio;
         vet_posy[i] = 10;
     }
}

void display(void)
{
     int cont;
     glClear(GL_COLOR_BUFFER_BIT);
     glColor3f(1.0, 1.0, 1.0);
     glLineWidth(15.0);

     // borda
     glBegin(GL_LINE_LOOP);
       glVertex2i(1,1);  glVertex2i(180,1);
       glVertex2i(180,100); glVertex2i(1,100);
     glEnd();


     for (cont = 0; cont < 10; cont++)
     {
         criaQuads(x, vet_posy[cont], 0.8, 0.2, 0.8);
         x = x + 15;
     }
     x = 11;
     if (cont_numquads < 10)
       cont_numquads++;



  glFlush();
  glutSwapBuffers();
 }

void criaQuads(int x, int y, float corR, float corG, float corB)
{
  glColor3f(corR, corG, corB);

  glBegin(GL_QUADS);
    glVertex2i(x, y + 10);
    glVertex2i(x + 10, y + 10);
    glVertex2i(x + 10, y);
    glVertex2i(x, y);
  glEnd();
}



void keyboard(unsigned char key, int x, int y){
  switch (key)
  {
         case 27:
              exit(0);
              break;
         case 32:
              glutTimerFunc(50, move, 1);
              break;
  }
}



void move(int passo)
{
  for(int cont = 0; cont < cont_numquads; cont++)
  {
    if (direcao[cont] == 1)
       vet_posy[cont] += inc;

    if (vet_posy[cont] == height)
       direcao[cont] = 0;

    if (direcao[cont] == 0)
         vet_posy[cont] -= inc;

    if (vet_posy[cont] == 10)
       direcao[cont] = 1;
 }

 glutPostRedisplay();
 glutTimerFunc(30,move, 1);
}