/*
 * X11 functions
 */


#include "x11.hh"

X11Output::X11Output() {
  XGCValues gcvalues;
  display= XOpenDisplay(0);
  window= XCreateSimpleWindow(display,
                              DefaultRootWindow(display),
                              0,0, 500,500, 0,0,0);
  gcvalues.background= 0;
  fabric= XCreateGC(display,window,GCBackground,&gcvalues);
  gcvalues.foreground= 1;
  gcvalues.background= 1;
  mesh= XCreateGC(display,window,GCForeground|GCBackground,&gcvalues);
  XSelectInput(display,window,0);
  XMapWindow(display,window);
  XFlush(display);
}

void X11Output::startimage() {
  XClearWindow(display,window);
}

void X11Output::endimage() {
  XFlush(display);
}

X11Output::~X11Output() {
  XCloseDisplay(display);
}

void X11Output::drawcell(const Point* list, int n) {
  XPoint xp[n+1];
  for (int i=0; i<n; i++) {
    Onscreen here= Onscreen(list[i]);
    xp[i].x= (int)((here.x+1.0)*250.0);
    xp[i].y= (int)((-here.y+1.0)*250.0);
  }
  XFillPolygon(display,window,fabric,xp,n,Nonconvex,CoordModeOrigin);
  xp[n]= xp[0];
  XDrawLines(display,window,mesh,xp,n+1,CoordModeOrigin);
}