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Simple Robot in OpenGL

below is a simple program that will compile on VS.

A robot will be shown and if you right click and select a component (say upper arm), it will rotate.

However I want to change the program so that two arms can rotate at the same time and no mouse is involved, does anyone know how?

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#include <GL/glut.h>

#define TORSO_HEIGHT 5.0
#define UPPER_ARM_HEIGHT 3.0
#define LOWER_ARM_HEIGHT 2.0
#define UPPER_LEG_RADIUS  0.5
#define LOWER_LEG_RADIUS  0.5
#define LOWER_LEG_HEIGHT 2.0
#define UPPER_LEG_HEIGHT 3.0
#define UPPER_LEG_RADIUS  0.5
#define TORSO_RADIUS 1.0
#define UPPER_ARM_RADIUS  0.5
#define LOWER_ARM_RADIUS  0.5
#define HEAD_HEIGHT 1.5
#define HEAD_RADIUS 1.0

typedef float point[3];

static GLfloat theta[11] = {0.0,0.0,0.0,0.0,0.0,0.0,0.0,
            180.0,0.0,180.0,0.0}; /* initial joint angles */
static GLint angle = 2;

GLUquadricObj *t, *h, *lua, *lla, *rua, *rla, *lll, *rll, *rul, *lul;

double size=1.0;

void torso()
{
   glPushMatrix();
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   gluCylinder(t,TORSO_RADIUS, TORSO_RADIUS, TORSO_HEIGHT,10,10);
   glPopMatrix();
}

void head()
{
   glPushMatrix();
   glTranslatef(0.0, 0.5*HEAD_HEIGHT,0.0);
   glScalef(HEAD_RADIUS, HEAD_HEIGHT, HEAD_RADIUS);
   gluSphere(h,1.0,10,10);
   glPopMatrix();
}

void left_upper_arm()
{
   glPushMatrix();
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   gluCylinder(lua,UPPER_ARM_RADIUS, UPPER_ARM_RADIUS, UPPER_ARM_HEIGHT,10,10);
   glPopMatrix();
}

void left_lower_arm()
{
   glPushMatrix();
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   gluCylinder(lla,LOWER_ARM_RADIUS, LOWER_ARM_RADIUS, LOWER_ARM_HEIGHT,10,10);
   glPopMatrix();
}

void right_upper_arm()
{
   glPushMatrix();
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   gluCylinder(rua,UPPER_ARM_RADIUS, UPPER_ARM_RADIUS, UPPER_ARM_HEIGHT,10,10);
   glPopMatrix();
}

void right_lower_arm()
{
   glPushMatrix();
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   gluCylinder(rla,LOWER_ARM_RADIUS, LOWER_ARM_RADIUS, LOWER_ARM_HEIGHT,10,10);
   glPopMatrix();
}

void left_upper_leg()
{
   glPushMatrix();
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   gluCylinder(lul,UPPER_LEG_RADIUS, UPPER_LEG_RADIUS, UPPER_LEG_HEIGHT,10,10);
   glPopMatrix();
}

void left_lower_leg()
{
   glPushMatrix();
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   gluCylinder(lll,LOWER_LEG_RADIUS, LOWER_LEG_RADIUS, LOWER_LEG_HEIGHT,10,10);
   glPopMatrix();
}

void right_upper_leg()
{
   glPushMatrix();
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   gluCylinder(rul,UPPER_LEG_RADIUS, UPPER_LEG_RADIUS, UPPER_LEG_HEIGHT,10,10);
   glPopMatrix();
}

void right_lower_leg()
{
   glPushMatrix();
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   gluCylinder(rll,LOWER_LEG_RADIUS, LOWER_LEG_RADIUS, LOWER_LEG_HEIGHT,10,10);
   glPopMatrix();
}

void
display(void)
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glColor3f(0.0, 0.0, 0.0);

    glRotatef(theta[0], 0.0, 1.0, 0.0);
    torso();
    glPushMatrix();

    glTranslatef(0.0, TORSO_HEIGHT+0.5*HEAD_HEIGHT, 0.0);
    glRotatef(theta[1], 1.0, 0.0, 0.0);
    glRotatef(theta[2], 0.0, 1.0, 0.0);
    glTranslatef(0.0, -0.5*HEAD_HEIGHT, 0.0);
    head();

    glPopMatrix();
    glPushMatrix();
    glTranslatef(-(TORSO_RADIUS+UPPER_ARM_RADIUS), 0.9*TORSO_HEIGHT, 0.0);
    glRotatef(theta[3], 1.0, 0.0, 0.0);
    left_upper_arm();

    glTranslatef(0.0, UPPER_ARM_HEIGHT, 0.0);
    glRotatef(theta[4], 1.0, 0.0, 0.0);
    left_lower_arm();

    glPopMatrix();
    glPushMatrix();
    glTranslatef(TORSO_RADIUS+UPPER_ARM_RADIUS, 0.9*TORSO_HEIGHT, 0.0);
    glRotatef(theta[5], 1.0, 0.0, 0.0);
    right_upper_arm();

    glTranslatef(0.0, UPPER_ARM_HEIGHT, 0.0);
    glRotatef(theta[6], 1.0, 0.0, 0.0);
    right_lower_arm();

    glPopMatrix();
    glPushMatrix();
    glTranslatef(-(TORSO_RADIUS+UPPER_LEG_RADIUS), 0.1*UPPER_LEG_HEIGHT, 0.0);
    glRotatef(theta[7], 1.0, 0.0, 0.0);
    left_upper_leg();

    glTranslatef(0.0, UPPER_LEG_HEIGHT, 0.0);
    glRotatef(theta[8], 1.0, 0.0, 0.0);
    left_lower_leg();

    glPopMatrix();
    glPushMatrix();
    glTranslatef(TORSO_RADIUS+UPPER_LEG_RADIUS, 0.1*UPPER_LEG_HEIGHT, 0.0);
    glRotatef(theta[9], 1.0, 0.0, 0.0);
    right_upper_leg();

    glTranslatef(0.0, UPPER_LEG_HEIGHT, 0.0);
    glRotatef(theta[10], 1.0, 0.0, 0.0);
    right_lower_leg();

    glPopMatrix();
    glFlush();
    glutSwapBuffers();
}



void mouse(int btn, int state, int x, int y)
{
      if(btn==GLUT_LEFT_BUTTON && state == GLUT_DOWN)
        {
        theta[angle] += 5.0;
        if( theta[angle] > 360.0 ) theta[angle] -= 360.0;
        }
      if(btn==GLUT_RIGHT_BUTTON && state == GLUT_DOWN)
        {
        theta[angle] -= 5.0;
        if( theta[angle] < 360.0 ) theta[angle] += 360.0;
        }
        display();
}

void menu(int id)
{
   if(id <11 ) angle=id;
   if(id ==11 ) exit();
}

void
myReshape(int w, int h)
{
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    if (w <= h)
        glOrtho(-10.0, 10.0, -10.0 * (GLfloat) h / (GLfloat) w,
            10.0 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
    else
        glOrtho(-10.0 * (GLfloat) w / (GLfloat) h,
            10.0 * (GLfloat) w / (GLfloat) h, 0.0, 10.0, -10.0, 10.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

void myinit()
{
        GLfloat mat_specular[]={1.0, 1.0, 1.0, 1.0};
        GLfloat mat_diffuse[]={1.0, 1.0, 1.0, 1.0};
        GLfloat mat_ambient[]={1.0, 1.0, 1.0, 1.0};
        GLfloat mat_shininess={100.0};
        GLfloat light_ambient[]={0.0, 0.0, 0.0, 1.0};
        GLfloat light_diffuse[]={1.0, 1.0, 1.0, 1.0};
        GLfloat light_specular[]={1.0, 1.0, 1.0, 1.0};
        GLfloat light_position[]={10.0, 10.0, 10.0, 0.0};

        glLightfv(GL_LIGHT0, GL_POSITION, light_position);
        glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
        glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
        glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);

        glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
        glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
        glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
        glMaterialf(GL_FRONT, GL_SHININESS, mat_shininess);

        glShadeModel(GL_SMOOTH);
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
        glDepthFunc(GL_LEQUAL);
        glEnable(GL_DEPTH_TEST);

        glClearColor(1.0, 1.0, 1.0, 1.0);
        glColor3f(0.0, 0.0, 0.0);

/* allocate quadrics with filled drawing style */

        h=gluNewQuadric();
        gluQuadricDrawStyle(h, GLU_FILL);
        t=gluNewQuadric();
        gluQuadricDrawStyle(t, GLU_FILL);
        lua=gluNewQuadric();
        gluQuadricDrawStyle(lua, GLU_FILL);
        lla=gluNewQuadric();
        gluQuadricDrawStyle(lla, GLU_FILL);
        rua=gluNewQuadric();
        gluQuadricDrawStyle(rua, GLU_FILL);
        rla=gluNewQuadric();
        gluQuadricDrawStyle(rla, GLU_FILL);
        lul=gluNewQuadric();
        gluQuadricDrawStyle(lul, GLU_FILL);
        lll=gluNewQuadric();
        gluQuadricDrawStyle(lll, GLU_FILL);
        rul=gluNewQuadric();
        gluQuadricDrawStyle(rul, GLU_FILL);
        rll=gluNewQuadric();
        gluQuadricDrawStyle(rll, GLU_FILL);
}

void main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowSize(500, 500);
    glutCreateWindow("robot");
    myinit();
    glutReshapeFunc(myReshape);
    glutDisplayFunc(display);
    glutMouseFunc(mouse);

    glutCreateMenu(menu);
    glutAddMenuEntry("torso", 0);
    glutAddMenuEntry("head1", 1);
    glutAddMenuEntry("head2", 2);
    glutAddMenuEntry("right_upper_arm", 3);
    glutAddMenuEntry("right_lower_arm", 4);
    glutAddMenuEntry("left_upper_arm", 5);
    glutAddMenuEntry("left_lower_arm", 6);
    glutAddMenuEntry("right_upper_leg", 7);
    glutAddMenuEntry("right_lower_leg", 8);
    glutAddMenuEntry("left_upper_leg", 9);
    glutAddMenuEntry("left_lower_leg", 10);
    glutAddMenuEntry("quit", 11);
    glutAttachMenu(GLUT_MIDDLE_BUTTON);

    glutMainLoop();
}

0
izomax
Asked:
izomax
  • 3
  • 2
1 Solution
 
davebytesCommented:
I'm not sure what you want to do.

in the mouse function, you want to iterate the angles for both arms -- right now, only one theta[ID] is updated at one time.  duplicate the lines, and move the second arm angle at the same time.

in the display function, you could have it automatically update the arm angle(s) each frame, maybe one degree per frame.  I assume that's what you mean by not using a mouse?  or, did you mean you wanted to use the keyboard instead??

-d
0
 
izomaxAuthor Commented:
Hi

I wanted that when I run the program, the arms will rotate itself, so it will look like a little animation.

0
 
izomaxAuthor Commented:
So are you saying change the mouse function to this?


void mouse(int btn, int state, int x, int y)
{
     if(btn==GLUT_LEFT_BUTTON && state == GLUT_DOWN)
        {
        theta[angle] += 5.0;
        theta[angle] += 5.0;
        if( theta[angle] > 360.0 ) theta[angle] -= 360.0;
        }
     if(btn==GLUT_RIGHT_BUTTON && state == GLUT_DOWN)
        {
        theta[angle] -= 5.0;

        if( theta[angle] < 360.0 ) theta[angle] += 360.0;
        }
        display();
}

0
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izomaxAuthor Commented:
Also how do I automatically update the arm angle(s) each frame?

Thanks.
0
 
davebytesCommented:
at the top of:

void
display(void)
{

insert something like:

        theta[3] += 5.0;
        if( theta[3] > 360.0 ) theta[3] -= 360.0;
        theta[5] += 5.0;
        if( theta[5] > 360.0 ) theta[5] -= 360.0;

that should cause the upper arms to rotate.

-d
0
 
koposCommented:
Use glutIdleFunc() as a callback function to actually do all your activities.

The angle can be increased in this idle function and use this glutIdleFunc() to display the program. Try something like this....

glutIdleFunc(idle);

/* will be called once every frame */
void idle()
{
  /* do all calculations. increase angles etc here */
 ...
 glutPostRedisplay();
}


One more point, never call the display function by name. Use glutPostRedisplay() eveytime instead of the explicit name of the 'display()' func.
0

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