#ifdef __STRICT_ANSI__
  #define _BSD_SOURCE
  #endif
  #include <rfb/rfb.h>
  #define _USE_MATH_DEFINES
  #include <math.h>
  
  static void initBackground(rfbScreenInfoPtr server)
  {
    unsigned int i,j;
  
    for(i=0;i<server->width;i++)
      for(j=0;j<server->height;j++) {
        server->frameBuffer[(j*server->width+i)*4+0]=i&0xff;
        server->frameBuffer[(j*server->width+i)*4+1]=j&0xff;
        server->frameBuffer[(j*server->width+i)*4+2]=(i*j)&0xff;
      }
  }
  
  int main(int argc,char** argv)
  {             
    int width=400,height=300,w=20,x,y;
    double r,phi=0;
    
    rfbScreenInfoPtr server=rfbGetScreen(&argc,argv,width,height,8,3,4);
    if(!server)
      return 0;
    server->frameBuffer=(char*)malloc(width*height*4);
    initBackground(server);
    server->deferUpdateTime=0;
    rfbInitServer(server);
  
    r=0;
    while(1) {
      if(r<=0) {
        initBackground(server);
        rfbMarkRectAsModified(server,0,0,width,height);
        r=0.43;
        phi=0;
      } else {
        r-=0.0001;
        phi+=0.02;
        if(phi>2*M_PI)
  	phi-=2*M_PI;
      }
      x=width*(0.5+cos(phi)*r);
      y=height*(0.5+sin(phi)*r);
      if(x>=0 && y>=0 && x+w<=width && y+w<=height) {
        unsigned int dx=width*0.5*(1-cos(phi)*r)-x,
        		dy=height*0.5*(1-sin(phi)*r)-y;
        rfbDoCopyRect(server,x,y,x+w,y+w,-dx,-dy);
      }
      rfbProcessEvents(server,50000);
    }
    return(0);
  }