318                 SphereCoord  coord = &ball->sphere_map[total];  in trackball_init()  local
325                     coord->x      = xx;  in trackball_init()
326                     coord->y      = yy;  in trackball_init()
327                     coord->offset = xx + yy*diameter2;  in trackball_init()
328                     coord->alpha  = 256;  in trackball_init()
329                     coord->f[0]   = FIX16_FROM_FLOAT(rx);  in trackball_init()
330                     coord->f[1]   = FIX16_FROM_FLOAT(ry);  in trackball_init()
331                     coord->f[2]   = FIX16_FROM_FLOAT(rz);  in trackball_init()
333                         coord->alpha = 256*(radius - r0);  in trackball_init()
351                         coord->alpha = coord->alpha * scale;  in trackball_init()
355                     coord->x      = xx;  in trackball_init()
356                     coord->y      = yy;  in trackball_init()
357                     coord->offset = xx + yy*diameter2;  in trackball_init()
358                     coord->alpha  = 0;  in trackball_init()
360                         coord->alpha = -256*(r0 - (radius2-1.));  in trackball_init()
488         SphereCoord  coord = &ball->sphere_map[nn];  in trackball_refresh()  local
491         if (coord->alpha > 0) {  in trackball_refresh()
493             Fix16  ax = fixedvector_dot( (Fix16Vector)&coord->f, (Fix16Vector)&faxes[0] );  in trackball_refresh()
494             Fix16  ay = fixedvector_dot( (Fix16Vector)&coord->f, (Fix16Vector)&faxes[1] );  in trackball_refresh()
495             Fix16  az = fixedvector_dot( (Fix16Vector)&coord->f, (Fix16Vector)&faxes[2] );  in trackball_refresh()
525             if (coord->alpha < 256) {  in trackball_refresh()
526                 int  a = coord->alpha;  in trackball_refresh()
529             else if (coord->alpha > 256) {  in trackball_refresh()
530                 int  a = (coord->alpha - 256);  in trackball_refresh()
538             if (coord->alpha < 0) {  in trackball_refresh()
539                 int  a = -coord->alpha;  in trackball_refresh()
544         pixels[coord->x + diameter*coord->y] = color;  in trackball_refresh()