Demo_Pendulo.c

// DIBUJO DE UN PENDULO [copiado]

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

const  double pi2 = 6.28318530718;

void display(void){

  static double radius = 0.05;

  const double delta_theta = pi2/20;

  double xcenter , ycenter;  

  double x, y;

  double theta = 0.0;



  double current_angle = cos(omega * time);



  glColor3f(0.0, 0.0, 0.0);

  glClear(GL_COLOR_BUFFER_BIT);

  glColor3f(1.0, 1.0, 1.0);



  /* Dibujar la cuerda del péndulo */  

  glColor3f(1.0, 1.0, 1.0);

  glBegin(GL_LINES);

  glVertex2f(0.0, 0.0);

  xcenter = -cord_length * sin(current_angle);

  ycenter = -cord_length * cos(current_angle);

  glVertex2f(xcenter, ycenter);

  glEnd();



  /* Dibujar el disco del péndulo */

  glColor3f(1.0, 0.0, 0.0);

  glBegin(GL_POLYGON);

  while (theta <= pi2) {

    x = xcenter + radius * sin(theta);

    y = ycenter + radius * cos(theta);

    glVertex2f(x, y);

    theta += delta_theta;

  };

  glEnd();

  

  glutSwapBuffers();

};