//compile = gcc -o animate animate.c -lX11 -lGL -lGLU && ./animate
#include<stdio.h>
#include<stdlib.h>
#include<X11/X.h>
#include<X11/Xlib.h>
#include<GL/gl.h>
#include<GL/glx.h>
#include<GL/glu.h>
#include<GL/glut.h>

Display                 *dpy;
Window                  root;
GLint                   att[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_DOUBLEBUFFER, None };
XVisualInfo             *vi;
Colormap                cmap;
XSetWindowAttributes    swa;
Window                  win;
GLXContext              glc;
XWindowAttributes       gwa;
XEvent                  xev;

float randFloat(float a, float b){
    float temp = ((b-a)*((float)rand()/RAND_MAX))+a;
    return temp;
}

void DrawAQuad(float xpos, float ypos, float zpos, float scale,float r, float g, float b) {

glBegin(GL_QUADS);// depan
  glColor3f(r, g, 0.5);
  glVertex3f(xpos + 0, ypos + 0, zpos + 0.);
  glVertex3f(xpos +  0, ypos + (.05*scale), zpos + 0.);
  glVertex3f( xpos + (.05*scale),  ypos + (.05*scale), zpos + 0.);
  glVertex3f(xpos + (.05*scale),  ypos + 0, zpos + 0.);
 glEnd();

 glBegin(GL_QUADS);//kiri
  glColor3f(r, 0.5, b);
  glVertex3f(xpos + (.05*scale), ypos + .0, zpos + 0.);
  glVertex3f( xpos + (.05*scale), ypos + (.05*scale), zpos + 0.);
  glVertex3f( xpos + (.05*scale),  ypos + (.05*scale), zpos + (.05*scale));
  glVertex3f(xpos + (.05*scale),  ypos + .0, zpos + (.05*scale));
 glEnd();

 glBegin(GL_QUADS);//atas
  glColor3f(0.5, g, b);
  glVertex3f(xpos + 0., ypos + (.05*scale), zpos + 0.);
  glVertex3f( xpos + .0, ypos + (.05*scale), zpos + (.05*scale));
  glVertex3f( xpos + (.05*scale),  ypos + (.05*scale), zpos + (.05*scale));
  glVertex3f(xpos + (.05*scale),  ypos + (.05*scale), zpos + 0.);
 glEnd();
 glBegin(GL_QUADS);//kanan
  glColor3f(0.123, 0.923, 0.523);
  glVertex3f(xpos + 0., ypos + 0., zpos + 0.);
  glVertex3f( xpos + .0, ypos + (.05*scale), zpos + 0.);
  glVertex3f( xpos + .0,  ypos + (.05*scale), zpos + (.05*scale));
  glVertex3f(xpos + .0,  ypos + .0, zpos + (.05*scale));
 glEnd();
 glBegin(GL_QUADS);//belakang
  glColor3f(0.302, 0.212, 0.75);
  glVertex3f(xpos + 0., ypos + 0.0, zpos + (.05*scale));
  glVertex3f( xpos + .0, ypos + (.05*scale), zpos + (.05*scale));
  glVertex3f( xpos + (.05*scale),  ypos + (.05*scale), zpos + (.05*scale));
  glVertex3f(xpos + (.05*scale),  ypos + .0, zpos + (.05*scale));
 glEnd();
 glBegin(GL_QUADS);//bawah
  glColor3f(0.88, 0.77, 0.66);
  glVertex3f(xpos + 0., ypos + 0., zpos + 0.);
  glVertex3f( xpos + .0, ypos + .0, zpos + (.05*scale));
  glVertex3f( xpos + (.05*scale),  ypos + .0, zpos + (.05*scale));
  glVertex3f(xpos + (.05*scale),  ypos + .0, zpos + 0.);
 glEnd();
    }

int main(int argc, char *argv[]) {

 dpy = XOpenDisplay(NULL);

 if(dpy == NULL) {
    printf("\n\tcannot connect to X server\n\n");
        exit(0); }

 root = DefaultRootWindow(dpy);

 vi = glXChooseVisual(dpy, 0, att);

 if(vi == NULL) {
    printf("\n\tno appropriate visual found\n\n");
        exit(0); }
 else {
    printf("\n\tvisual %p selected\n", (void *)vi->visualid); }/* %p creates hexadecimal output like in glxinfo */


 cmap = XCreateColormap(dpy, root, vi->visual, AllocNone);

 swa.colormap = cmap;
 swa.event_mask = ExposureMask | KeyPressMask;

 win = XCreateWindow(dpy, root, 0, 0, 600, 600, 0, vi->depth, InputOutput, vi->visual, CWColormap | CWEventMask, &swa);

 XMapWindow(dpy, win);
 XStoreName(dpy, win, "VERY SIMPLE APPLICATION");

 glc = glXCreateContext(dpy, vi, NULL, GL_TRUE);
 glXMakeCurrent(dpy, win, glc);

 glEnable(GL_DEPTH_TEST);
 float tambah = 0.0;
 float nilai = 0.01;
 int hitung = 0;
 int nilai_int = 1;
 int batas = 50;

 while(1) {

        XGetWindowAttributes(dpy, win, &gwa);
        glViewport(0, 0, gwa.width, gwa.height);
        // start draw here
        glClearColor(.0 - tambah, .5 + tambah, .0 - tambah, .0);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glOrtho(-1., 1., -1., 1., 1., 20.);

        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        gluLookAt( 1.5 +(tambah*10), 5.0 , 5., 0., 0., 0., 0., 1., 0.);

        DrawAQuad(.0 + tambah, .0, .0, 5, 0.2,0.098,0.2+tambah);
        DrawAQuad(.0 - tambah, .0, .0, 5, 0.2,0.098+tambah,0.2);
        DrawAQuad(.0, .0 +tambah, .0,5 , 0.2+tambah,0.098,0.2);
        DrawAQuad(.0 , .0 - tambah, .0, 5, 0.2+tambah,0.098+tambah,0.2);
        DrawAQuad(.0, .0, .0 + tambah, 5, 0.2,0.098+tambah,0.2+tambah);
        DrawAQuad(.0, .0, .0 - tambah, 5, 0.2+tambah,0.098+tambah,0.2+tambah);
        tambah += nilai;
        hitung += nilai_int;
        //printf("tambah %f \n",tambah);
        //printf("batas %f \n",batas);
        if(hitung == batas){
            nilai_int = -(nilai_int);
            nilai = -(nilai);
            batas = -(batas);
        }


        // end draw
        glXSwapBuffers(dpy, win);

    } /* this closes while(1) { */
} /* this is the } which closes int main(int argc, char *argv[]) { */