„Számítógépes grafika házi feladat tutorial” változatai közötti eltérés

  // Piros kor, a kepernyo bal oldalan

  glBegin(GL_TRIANGLE_FAN); {

    float radius = 0.25f, center_x = -0.5f, center_y = 0.4f;

    glColor3f(1.0f, 0.0f, 0.0f);

    glVertex2f(center_x, center_y);

    for(int i = 0; i <= CIRCLE_RESOLUTION; i++) {

      float angle = float(i) / CIRCLE_RESOLUTION * 2.0f * M_PI;

      // Itt a kor paramtetrikus alakjat hasznaljuk: x = x0 + r*cos(t), y = y0 + r * sin(t)

      glVertex2f(center_x + radius*cos(angle), center_y + radius*sin(angle));

    }

  } glEnd();

  // Szinatmenetes kor, a kepernyo jobb oldalan

  glBegin(GL_TRIANGLE_FAN); {

    float radius = 0.25f, center_x = 0.5f, center_y = 0.4f;

    glColor3f(0.0f, 1.0f, 1.0f);

    glVertex2f(center_x, center_y);

    for(int i = 0; i <= CIRCLE_RESOLUTION; i++) {

      float angle = float(i) / CIRCLE_RESOLUTION * 2.0f * M_PI;

      glColor3f(0.0f, 0.5f + 0.5f*cos(angle), 0.5f + 0.5f*sin(angle));

      glVertex2f(center_x + radius*cos(angle), center_y + radius*sin(angle));

    }

  } glEnd();

  // Felkoriv

  glBegin(GL_LINE_STRIP); {

    float radius = 0.75f, center_x = 0.0f, center_y = 0.0f;

    glColor3f(1.0f, 1.0f, 1.0f);

    for(int i = CIRCLE_RESOLUTION/2; i <= CIRCLE_RESOLUTION; i++) {

      float angle = float(i) / CIRCLE_RESOLUTION * 2.0f * M_PI;

      glVertex2f(center_x + radius*cos(angle), center_y + radius*sin(angle));

    }

  } glEnd();