c++ - Two spheres collision -

i have make program doing collision between 2 spheres. made when spheres collide blocked. can't move sphere anymore. made sphere1 move , other static. code written in vb/ c++.

#include "glos.h" #include <math.h> #include <gl/gl.h> #include <gl/glu.h> #include <glaux.h>   glfloat max1=0,max2=0,v,v1;  float d,distanta=0; int i,j; void myinit(void);  void callback display(void); void callback myreshape(glsizei w, glsizei h); void callback mutastanga(void); void callback mutadreapta(void);   int k=0,k1=0; int dist_ramasa; static float dx1=200,dy1=300,dz1=0;  int deplasare=100; float rez; static int flag=1;  float pxc,pyc,pzc,sum,suma_raze;    void myinit (void) {   //iluminating    glclearcolor(1.0, 1.0, 1.0, 1.0);    glfloat mat_ambient[] = { 0.3, 0.3, 0.3, 1.0 };     glfloat mat_diffuse[] = { 0.8, 0.8, 0.8, 1.0 };       glfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };     glfloat mat_shininess[] = { 100.0 };      glfloat light_ambient[] = { 0.4, 0.4, 0.4, 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[] = { 1.0, 1.0, 0.0, 0.0 };      glfloat lmodel_ambient[] = { 0.5, 0.5, 0.5, 1.0 };      glmaterialfv(gl_front, gl_ambient, mat_ambient);     glmaterialfv(gl_front, gl_diffuse, mat_diffuse);     glmaterialfv(gl_front, gl_specular, mat_specular);     glmaterialfv(gl_front, gl_shininess, mat_shininess);      gllightfv(gl_light0, gl_ambient, light_ambient);     gllightfv(gl_light0, gl_diffuse, light_diffuse);     gllightfv(gl_light0, gl_specular, light_specular);     gllightfv(gl_light0, gl_position, light_position);      gllightmodelfv(gl_light_model_ambient, lmodel_ambient);      glenable(gl_lighting); // activare iluminare     glenable(gl_light0);    // activare sursa 0      glcolormaterial(gl_front,gl_diffuse);     glenable(gl_color_material);     gldepthfunc(gl_less);     glenable(gl_depth_test);  }     struct sfera   //the spheres {     glfloat raza, xcentru, ycentru, zcentru;   //the radius , centers        glfloat xd1,xd2,yd1,yd2,zd1,zd2;   }sf[2];  void initraza(){  //radius init   sf[0].raza=100; sf[1].raza=100; }  int conditie(void){   //this verify if collide     initraza();     double xac1,yac1,zac1,xac2,yac2,zac2;//the new centers after movement       xac1=sf[0].xcentru+dx1;     yac1=sf[0].ycentru+dy1;     zac1=sf[0].zcentru+dz1;                                     //static sphere     xac2=sf[1].xcentru+700;     yac2=sf[1].ycentru+300;     zac2=sf[1].zcentru;       pxc = pow((xac1-xac2),2);            pyc = pow((yac1-yac2),2);      pzc = pow((zac1-zac2),2);       sum=(pxc + pyc + pzc);               distanta=sqrt(sum);          //the distance between centers       //the sum of radiuses      suma_raze=sf[0].raza+sf[1].raza;       dist_ramasa=distanta-sf[0].raza-sf[1].raza;       // compare distance , sum of radiuses      //if distance lower sum -> collide     if(distanta>suma_raze)         return 1;     else         return 0; }       void callback mutastanga(void)   //movement left {     if(conditie()==1){         if(dist_ramasa<deplasare)             dx1=dx1-dist_ramasa;         else             dx1=dx1-deplasare;     }  }    void callback mutadreapta(void)   //movement right {      if(conditie()==1){               if(dist_ramasa<deplasare)                 dx1=dx1+dist_ramasa;              else                  dx1=dx1+deplasare;      }   }  void callback mutasus(void)    //movement {          if(conditie()==1){               if(dist_ramasa<deplasare)                 dy1=dy1+dist_ramasa;              else                  dy1=dy1+deplasare;      }  } void callback mutajos(void)  //movement down {     if(conditie()==1){               if(dist_ramasa<deplasare)                 dy1=dy1-dist_ramasa;              else                  dy1=dy1-deplasare;      }  } void drawball1()   //the first sphere {     glpushmatrix();       glcolor3f(0,1,0);     gltranslatef(dx1, dy1, 0.0);                     glrotatef(30,1,0,0);         auxsolidsphere(sf[0].raza);      glpopmatrix(); }  void drawball2()  //the second sphere {     glpushmatrix();      glcolor3f(1,0,0);     gltranslatef(700,300,0);     glrotatef(30,1,0,0);       auxwiresphere(sf[1].raza);      glpopmatrix();  }  void callback display (void)   {        initraza();     glclear(gl_color_buffer_bit | gl_depth_buffer_bit);        glloadidentity ();        drawball1();      drawball2();                   auxswapbuffers();   }   void callback myreshape(glsizei w, glsizei h)    {     if (!h) return;     glviewport(0, 0, w, h);      glmatrixmode(gl_projection);     glloadidentity();     if (w <= h)          glortho (0, 800.0, 0*(glfloat)h/(glfloat)w,          -860.0*(glfloat)h/(glfloat)w, -200.0, 200.0);     else      glortho (0*(glfloat)w/(glfloat)h,          900.0*(glfloat)w/(glfloat)h, 0, 900.0, -500.0, 500.0);     glmatrixmode(gl_modelview); }  int main(int argc, char** argv) {     auxinitdisplaymode (aux_single | aux_rgb | aux_depth16);     auxinitposition (0, 0, 900, 700);     auxinitwindow ("bounding sphere collision");     myinit ();           auxkeyfunc (aux_left, mutastanga);         auxkeyfunc (aux_right, mutadreapta);         auxkeyfunc (aux_up, mutasus);         auxkeyfunc(aux_down,mutajos);        auxreshapefunc (myreshape);     auxmainloop(display);     return(0); } 

i don't know not working. when collide want reject each other . hope can me.

once spheres collide, function conditie return 1. keypress functions check before modifying sphere's position, thus, once collide, can no longer move sphere.