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

static int muslo = 0, pantorrilla = 0, pie = 0, pasoy = 0;

void dibuja(void)
{
	glClear (GL_COLOR_BUFFER_BIT);   
	glPushMatrix();
	   glRotatef ((GLfloat) pasoy, 0.0, 1.0, 0.0);
	   glPushMatrix();
	      glRotatef ((GLfloat) muslo, 0.0, 0.0, 1.0);
	      glPushMatrix();
	         glTranslatef (0.0, 1.6, 0.0);
	         glScalef (0.6, 2, 0.5);
		     glColor3f(1,0,1);
	         glutSolidCube (1.0);    //muslo
	      glPopMatrix();
	      glPushMatrix();
	         glTranslatef (0.0, 0.3, 0.0);
		     glColor3f(.7,.7,.7);
	         glutSolidSphere(0.29,15,15);    //rodilla
	      glPopMatrix();
	      glPushMatrix();
	         glRotatef (-(GLfloat) pantorrilla * 2, 0.0, 0.0, 1.0);
	         glPushMatrix();
	            glTranslatef (0.0, -1, 0.0);
	            glScalef (0.6, 2, 0.5);
		        glColor3f(0,0,1);
	            glutSolidCube (1.0); //pantorrilla
	         glPopMatrix();
	         glPushMatrix();
	            glTranslatef (0.0, -2.3, 0.0);
		        glColor3f(.7,.7,.7);
       		    glutSolidSphere(0.28,15,15);    //talon
	         glPopMatrix();
	         glPushMatrix();
	            glTranslatef(0, -2.8, 0.0);
	            glRotatef ((GLfloat) pie, 0.0, 0.0, 1.0);
	            glTranslatef (0, 2.8, 0.0); 
	            glPushMatrix();
	               glTranslatef (0.25, -2.8, 0.0);
	               glScalef (1, 0.35, 0.7);
	               glColor3f(.5,0,.8);
	               glutSolidCube (1.0);  //pie
	            glPopMatrix();
	         glPopMatrix();
	      glPopMatrix();
	   glPopMatrix();
	glPopMatrix();
	glutSwapBuffers();
}
void teclado (unsigned char key, int x, int y)
{
   switch (key) {
      case 27: exit(0);
      case 'M': muslo = (muslo + 5) % 360;
	        break;
      case 'm': muslo = (muslo - 5) % 360;
       		break;
      case 'A': if (pantorrilla >= 75) pantorrilla = 75;
       	        else pantorrilla +=  5;
       		break;
      case 'a': if(pantorrilla <= -5 ) pantorrilla = -5;
                else pantorrilla -=  5;
         	break;      
      case 'P': if (pie >= 30) pie = 30;
                else pie +=  5;
         	break;
      case 'p': if (pie <= -30) pie = -30;
         	    else pie -=  5;
         	break;
      case 'r': pasoy +=  2;   //rota con respecto a y
	     	break;
      case 'R': pasoy -= - 2;
      default: break;
   }
   glutPostRedisplay();         
}
void reshape (int w, int h)
{
   glMatrixMode (GL_PROJECTION);
   glLoadIdentity ();
   glOrtho(-4,4,-4,4,-4,4);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
}
int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
   glutInitWindowSize (500, 500); 
   glutInitWindowPosition (100, 100);
   glutCreateWindow ("Pierna");
   glutDisplayFunc(dibuja); 
   glutReshapeFunc(reshape);
   glutKeyboardFunc(teclado);
   glutMainLoop();
   return 0;
}