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Copy the latest glib from asir2000/lib.

/* $OpenXM: OpenXM_contrib2/asir2018/lib/glib,v 1.3 2019/09/26 04:15:35 takayama Exp $ */

/* BUG: this library has not yet been adapted to the new automatic launcher
        of ox_plot. 2002, Aug, 4.  Do not load glib more than twice. 
*/

extern Cfep_loaded$
extern Cfep_use_opengl$

#define DO_NOT_START_SERVER_EXPLICITLY

/* #define CLIP  1 */
/* #define DEBUG 1 */
#define LIST  4

def glib_floor(N) {
  return(pari(floor,N));
}

/*
def join(A,B) {
  if (type(B) == 0) return(A);
  return(append(A,B));
}
def eigenvalues(M) {
  return(pari(eigen,M));
}
def roots(F) {
  return(pari(roots,F));
}
*/

/*  ---------------------------------------------- */
def glib_ox_get_errors(P) {
  ox_push_cmd(P,276);
  return(ox_pop_cmo(P));
}

def reset_plot() {   
  /* It is no longer used. See, oxrfc103.rr */
  extern Glib_process;
  if ((!Cfep_loaded) || (!Cfep_use_opengl)) {
    print("  Sending signal to ox_plot",0);
    ox_reset(Glib_process);
    print("  Done.");
  }
}
Glib_ps = 0$
Glib_h = []$
Glib_canvas_x = 400$
Glib_canvas_y = 400$
Glib_xmin=0$  Glib_xmax=Glib_canvas_x$
Glib_ymin=0$  Glib_ymax=Glib_canvas_y$
Glib_math_coordinate=0$


Glib_canvas = -1$
Glib_xmag = 1$ Glib_ymag=1$ Glib_xoffset=0$ Glib_yoffset=0$
Glib_safe_mode = 2 $
Glib_counter = 100$

extern Glib_ps_sx$
extern Glib_ps_sy$
Glib_ps_sx=2$  /* mag=1/2 for PS picture. cf. glib_ps_form, glib_tops */
Glib_ps_sy=2$  /* mag=1/2 for PS picture */ 

def open_Canvas(P,S) {
  extern Glib_process;
  /* print("open_Canvas: ",0);print(S); */
  if ((!Cfep_loaded) || (!Cfep_use_opengl)) {
    if (P < 0) P=open_canvas(S); /* BUG, get process No. */
    else open_canvas(P,S);
    Glib_process = P; 
    R = ox_pop_cmo(P);
    /*
    if (glib_ox_get_errors(P) == []) {
      R = ox_pop_cmo(P);
    }else{
      debug;
    }
    */
  }else {
    R=cfep.open_canvas(S);
  }
  return(R);
}

/*&usage begin: glib_open()
  It starts the ox_plot server and opens a canvas.
  The canvas size is set to {Glib_canvas_x} X {Glib_canvas_y}
  (the default value is 400). 
  This function is automatically called when the user calls glib
  functions.
end: */

def glib_open() {
  extern Glib_canvas_x, Glib_canvas_y,
         Glib_process, Glib_canvas,
         Glib_server_started, Glib_process$
  if ((!Cfep_loaded) || (!Cfep_use_opengl)) return glib_openx11();
  else {
    Glib_canvas = open_Canvas(-1,[Glib_canvas_x,Glib_canvas_y])$
    Glib_server_started = 1$ 
    return(Glib_canvas);
  }
}
def glib_openx11() {
  extern Glib_canvas_x, Glib_canvas_y,
         Glib_process, Glib_canvas,
         Glib_server_started, Glib_process$
#ifndef DO_NOT_START_SERVER_EXPLICITLY
  if (type(Glib_server_started) == 0) { 
    Glib_process = ox_launch_nox(0,"ox_plot")$ 
    /* register_handler(reset_plot); */
    Glib_server_started = 1$ 
  }$
  Glib_canvas = open_Canvas(Glib_process,[Glib_canvas_x,Glib_canvas_y])$
#else
  Glib_canvas = open_Canvas(-1,[Glib_canvas_x,Glib_canvas_y])$
  /* register_handler(reset_plot); */
  Glib_server_started = 1$ 
#endif
  glib_check_strict();
  return(Glib_canvas);
}

def glib_check() {
  extern  Glib_process, Glib_canvas, Glib_safe_mode,
          Glib_canvas_x, Glib_canvas_y, Glib_counter;
  if (Glib_safe_mode == 0) {
     return(0);
  }
  if (Glib_safe_mode == 2) {
   if (Glib_counter > 0) {
     Glib_counter--;
     return(0);
   }else{
     Glib_counter=100;
   }
  }
  glib_check_strict();
}
def glib_check_strict() {
  extern  Glib_process, Glib_canvas, Glib_safe_mode,
          Glib_canvas_x, Glib_canvas_y, Glib_counter;
  if (Glib_canvas < 0) {
    glib_open();
  }
  if (Cfep_loaded && Cfep_use_opengl) return ;
  E = glib_ox_get_errors(Glib_process);
  if (E != []) {
    ox_pops(Glib_process,200);
    print(E);
    print("Warning: ",0);
    print("Drawing canvas seems to be closed.");
    print("Opening a new canvas.");
    Glib_canvas = open_Canvas(Glib_process,[Glib_canvas_x,Glib_canvas_y])$
    error("Drawing aborted");
  }
}

/*&usage begin: glib_clear()
  Clear the screen.
end: */
def glib_clear() {
  extern Glib_process, Glib_canvas;
  if (Glib_canvas < 0) glib_open();
  if ((!Cfep_loaded) || (!Cfep_use_opengl)) clear_canvas(Glib_process,Glib_canvas);
  else cfep.glib_clear();
}

/*&usage begin: glib_window(Xmin,Ymin,Xmax,Ymax)
  It generates a window with the left top corner [{Xmin},{Ymin}] and
  the right bottom corner [{Xmax},{Ymax}].
  If the global variable {Glib_math_coordinate} is set to 1, mathematical
  coordinate system will be employed, i.e., the left top
  corner will have the coordinate [{Xmin},{Ymax}].
  example: glib_window(-1,-1,10,10);
end: */
def glib_window(Xmin,Ymin,Xmax,Ymax) {
  extern Glib_xmin,  Glib_xmax, Glib_ymin, Glib_ymax,
         Glib_canvas_x, Glib_canvas_y, Glib_process, Glib_canvas,
         Glib_xoffset, Glib_yoffset, Glib_xmag, Glib_ymag;
  if (Xmax <= Xmin) error("glib window: Invalid size");
  if (Ymax <= Ymin) error("glib window: Invalid size");
  glib_check_arg(Xmin,Ymin); glib_check_arg(Xmax,Ymax);
  Glib_xmin = Xmin;  Glib_xmax = Xmax;
  Glib_ymin = Ymin;  Glib_ymax = Ymax;
  Glib_xoffset = -Xmin;
  Glib_yoffset = -Ymin;
  Glib_xmag    = Glib_canvas_x/(Xmax-Xmin);
  Glib_ymag    = Glib_canvas_y/(Ymax-Ymin);
  if (Glib_canvas < 0) glib_open();
}

def glib_check_arg(X,Y) {
  if (type(X) <= 1 && type(Y) <= 1) return 1;
  else {
    print("Error in glib: arguments ",0);
    print([X,Y],0);
    print(" are not numbers.");
    error("Invalid argument for glib_window, glib_putpixel, glib_line.");
  }
}

/*&usage begin: glib_putpixel(X,Y|color)
  It puts a pixel at [{X},{Y}] with {color}
  example: glib_putpixel(1,2 | color=0xffff00);
end: */
def glib_putpixel(X,Y) {
  extern Glib_process, Glib_canvas,
         Glib_xoffset, Glib_yoffset, Glib_xmag, Glib_ymag, Glib_ps,
         Glib_math_coordinate, Glib_canvas_y;
  if (Glib_canvas < 0) glib_open();
  glib_check();
  glib_check_arg(X,Y);
  C = getopt(color);
  if (Glib_math_coordinate) {
    Pos = [glib_floor(Glib_xmag*(X+Glib_xoffset)),
           Glib_canvas_y-glib_floor(Glib_ymag*(Y+Glib_yoffset))];
    Pos2= [glib_floor(Glib_xmag*(X+Glib_xoffset)),
           glib_floor(Glib_ymag*(Y+Glib_yoffset))];
  }else{
    Pos = [glib_floor(Glib_xmag*(X+Glib_xoffset)),
           glib_floor(Glib_ymag*(Y+Glib_yoffset))];
    Pos2= [glib_floor(Glib_xmag*(X+Glib_xoffset)),
           Glib_canvas_y-glib_floor(Glib_ymag*(Y+Glib_yoffset))];
  }
  if ( type(C) != -1 ) {
    if ((!Cfep_loaded) || (!Cfep_use_opengl)) draw_obj(Glib_process,Glib_canvas,Pos,C);
    else cfep.draw_obj2(Glib_process,Glib_canvas,Pos,C);
    if (Glib_ps) glib_history(["putpixel",Pos2,C]);
  }else{
    if ((!Cfep_loaded) || (!Cfep_use_opengl)) draw_obj(Glib_process,Glib_canvas,Pos);
    else cfep.draw_obj(Glib_process,Glib_canvas,Pos);
    if (Glib_ps) glib_history(["putpixel",Pos2,0]);
  }
}

/*&usage begin: glib_line(X0,Y0,X1,Y1|color,shape)
  It draws the line [{X0},{Y0}]-- [{X1},{Y1}] with {color} and {shape}
  example: glib_line(0,0,5,3/2 | color=0xff00ff);
           glib_line(0,0,10,0 | shape=arrow);
end: */
def glib_line(X0,Y0,X1,Y1) {
  extern Glib_xmag, Glib_ymag, Glib_xoffset, Glib_yoffset;
  C = getopt(color);
  glib_check_arg(X0,Y0);
  glib_check_arg(X1,Y1);
  glib_clip_line(glib_floor(Glib_xmag*(X0+Glib_xoffset)),
                 glib_floor(Glib_ymag*(Y0+Glib_yoffset)),
                 glib_floor(Glib_xmag*(X1+Glib_xoffset)),
                 glib_floor(Glib_ymag*(Y1+Glib_yoffset)),C);
  Shape = getopt(shape);
  if (type(Shape) != 2) return;
  Px = X0+(7/8)*(X1-X0);
  Py = Y0+(7/8)*(Y1-Y0);
  Qx = (Y0-Y1)/8;
  Qy = (X1-X0)/8;
  if (type(C)>0) glib_line(X1,Y1,Px+Qx,Py+Qy | color=C);
  else glib_line(X1,Y1,Px+Qx,Py+Qy);
  if (type(C)>0) glib_line(X1,Y1,Px-Qx,Py-Qy | color=C);
  else glib_line(X1,Y1,Px-Qx,Py-Qy);
}

def glib_clip_line(X0,Y0,X1,Y1,Color) {
  /* X0, Y0, X1, Y1 should be integers. 
     Coordinates are already translated. */
  extern Glib_process, Glib_canvas, Glib_canvas_x, Glib_canvas_y,
         Glib_ps,  Glib_math_coordinate;
  if (Glib_canvas < 0) glib_open();

if (Glib_ps) {
#ifdef DEBUG
  print(["clip_line",[X0,Y0,X1,Y1]]);
#endif
  /* clip by x = 0 */
  S = glib_clip0_x(X0,Y0,X1,Y1,0);
#ifdef DEBUG
  print(["clip0_x",S]);
#endif
  if (type(S) == 0) return;
  X0 = S[0]; Y0 = S[1]; X1 = S[2]; Y1 = S[3];

  S = glib_clip1_x(X0,Y0,X1,Y1,Glib_canvas_x-1);
#ifdef DEBUG
  print(["clip1_x",S]);
#endif
  if (type(S) == 0) return;
  X0 = S[0]; Y0 = S[1]; X1 = S[2]; Y1 = S[3];

  S = glib_clip0_y(X0,Y0,X1,Y1,0);
#ifdef DEBUG
  print(["clip0_y",S]);
#endif
  if (type(S) == 0) return;
  X0 = S[0]; Y0 = S[1]; X1 = S[2]; Y1 = S[3];

  S = glib_clip1_y(X0,Y0,X1,Y1,Glib_canvas_y-1);
#ifdef DEBUG
  print(["clip1_y",S]);
#endif
  if (type(S) == 0) return;
  X0 = S[0]; Y0 = S[1]; X1 = S[2]; Y1 = S[3];

#ifdef DEBUG
  print([X0,Y0,X1,Y1]);
#endif
}

  glib_check();
  if (Glib_math_coordinate) {
    Pos = [glib_floor(X0),Glib_canvas_y-glib_floor(Y0),
           glib_floor(X1),Glib_canvas_y-glib_floor(Y1)];
    Pos2= [glib_floor(X0),glib_floor(Y0),glib_floor(X1),glib_floor(Y1)];
  }else{
    Pos = [glib_floor(X0),glib_floor(Y0),glib_floor(X1),glib_floor(Y1)];
    Pos2 = [glib_floor(X0),Glib_canvas_y-glib_floor(Y0),
           glib_floor(X1),Glib_canvas_y-glib_floor(Y1)];
  }
  if ( type(Color) != -1 ) {
    if ((!Cfep_loaded) || (!Cfep_use_opengl)) draw_obj(Glib_process,Glib_canvas,Pos,Color);
    else cfep.draw_obj2(Glib_process,Glib_canvas,Pos,Color);
    if (Glib_ps) glib_history(["line",Pos2,Color]);
  }else{
    if ((!Cfep_loaded) || (!Cfep_use_opengl)) draw_obj(Glib_process,Glib_canvas,Pos);
    else cfep.draw_obj(Glib_process,Glib_canvas,Pos);
    if (Glib_ps) glib_history(["line",Pos2,0]);
  }
}

def glib_clip0_x(X0,Y0,X1,Y1,Clip) {
   if (X0 < Clip && X1 < Clip) return(0);
   if (X0 < Clip && X1 > Clip) {
     return([Clip, Y0+(Clip-X0)*(Y1-Y0)/(X1-X0),X1,Y1]);
   }
   if (X1 > Clip && X1 < Clip) {
     return([X0,Y0,Clip, Y1+(Clip-X1)*(Y0-Y1)/(X0-X1)]);
   }
   return([X0,Y0,X1,Y1]);
}
def glib_clip0_y(X0,Y0,X1,Y1,Clip) {
   if (Y0 < Clip && Y1 < Clip) return(0);
   if (Y0 < Clip && Y1 > Clip) {
     return([X0+(Clip-Y0)*(X1-X0)/(Y1-Y0),Clip,X1,Y1]);
   }
   if (Y1 > Clip && Y1 < Clip) {
     return([X0,Y0,X1+(Clip-Y1)*(X0-X1)/(Y0-Y1),Clip]);
   }
   return([X0,Y0,X1,Y1]);
}
def glib_clip1_x(X0,Y0,X1,Y1,Clip) {
   if (X0 > Clip && X1 > Clip) return(0);
   if (X0 > Clip && X1 < Clip) {
     return([Clip, Y0+(Clip-X0)*(Y1-Y0)/(X1-X0),X1,Y1]);
   }
   if (X1 < Clip && X1 > Clip) {
     return([X0,Y0,Clip, Y1+(Clip-X1)*(Y0-Y1)/(X0-X1)]);
   }
   return([X0,Y0,X1,Y1]);
}
def glib_clip1_y(X0,Y0,X1,Y1,Clip) {
   if (Y0 > Clip && Y1 > Clip) return(0);
   if (Y0 > Clip && Y1 < Clip) {
     return([X0+(Clip-Y0)*(X1-X0)/(Y1-Y0),Clip,X1,Y1]);
   }
   if (Y0 < Clip && Y1 > Clip) {
     return([X0,Y0,X1+(Clip-Y1)*(X0-X1)/(Y0-Y1),Clip]);
   }
   return([X0,Y0,X1,Y1]);
}

/*&usage begin: glib_print(X,Y,Text|color)
  It put a string {Text} at [{X},{Y}] on the glib canvas.
  example: glib_print(100,100,"Hello Worlds" | color=0xff0000);
end: */
def glib_print(X,Y,Text) {
  extern Glib_process, Glib_canvas,
         Glib_xoffset, Glib_yoffset, Glib_xmag, Glib_ymag, Glib_ps,
         Glib_math_coordinate, Glib_canvas_y;
  if (Glib_canvas < 0) glib_open();
  glib_check();
  glib_check_arg(X,Y);
  if (type(Text) != 7) error("glib_print(X,Y,Text): Text must be a string.");
  C = getopt(color);
  if (Glib_math_coordinate) {
    Pos = [glib_floor(Glib_xmag*(X+Glib_xoffset)),
           Glib_canvas_y-glib_floor(Glib_ymag*(Y+Glib_yoffset))];
    Pos2= [glib_floor(Glib_xmag*(X+Glib_xoffset)),
           glib_floor(Glib_ymag*(Y+Glib_yoffset))];
  }else{
    Pos = [glib_floor(Glib_xmag*(X+Glib_xoffset)),
           glib_floor(Glib_ymag*(Y+Glib_yoffset))];
    Pos2= [glib_floor(Glib_xmag*(X+Glib_xoffset)),
           Glib_canvas_y-glib_floor(Glib_ymag*(Y+Glib_yoffset))];
  }
  if ( type(C) != -1 ) {
    if ((!Cfep_loaded) || (!Cfep_use_opengl)) draw_string(Glib_process,Glib_canvas,Pos,Text,C);
    else cfep.draw_string2(Glib_process,Glib_canvas,Pos,Text,C);
    if (Glib_ps) glib_history(["print",Pos2,Text,C]);
  }else{
    if ((!Cfep_loaded) || (!Cfep_use_opengl)) draw_string(Glib_process,Glib_canvas,Pos,Text);
    else cfep.draw_string(Glib_process,Glib_canvas,Pos,Text);
    if (Glib_ps) glib_history(["print",Pos2,Text,0]);
  }
}

def glib_history(L) {
  extern Glib_h, Glib_canvas_x, Glib_canvas_y,
         Glib_math_coodinate;
  if (L[0] == "putpixel" || L[0] == "print") {
    if (L[1][0] <= Glib_canvas_x && L[1][0] >= 0) {
      if (L[1][1] <= Glib_canvas_x && L[1][1] >= 0) 
         Glib_h = cons(L,Glib_h);
    }
  }else {
    Glib_h = cons(L,Glib_h);
  }
  return 0;
}

#define xxx(x) idiv(x,Glib_ps_sx)
#define yyy(y) idiv(y,Glib_ps_sy)

/*&usage begin: glib_tops()
  If Glib_ps is set to 1, 
  it returns a postscript program to draw the picture on the canvas.
  ref: print_output
end: */
def glib_tops() {
  extern Glib_h;
  return glib_ps(Glib_h);
}
def glib_ps(L) {
  extern Glib_ps_sx;
  extern Glib_ps_sy;
  PS = string_to_tb("");
  Prev_color = 0;
  /* Prolog */
  write_to_tb("%%!PS-Adobe-1.0\n",PS);
  write_to_tb("%%BoundingBox: 0 0 " +
          rtostr(xxx(Glib_canvas_x)) + " " + rtostr(yyy(Glib_canvas_y)) + "\n",PS);
  write_to_tb("%%Creator: This is generated by ifplot\n",PS);
  write_to_tb("%%Title: ifplot\n",PS);
  write_to_tb("%%EndComments: \n",PS);
  write_to_tb("0.1 setlinewidth \n",PS);
  write_to_tb("2 setlinecap \n",PS);
  write_to_tb("2 setlinejoin \n",PS);
  write_to_tb("/ifplot_putpixel {  \n",PS);
  write_to_tb("    /yyy 2 1 roll def /xxx 2 1 roll def \n",PS);
  write_to_tb("    gsave newpath xxx yyy .5 0 360 arc \n",PS);
  write_to_tb("    fill grestore \n",PS);
  write_to_tb("} def \n",PS);

  L = reverse(L);
  N = length(L);
  for (I=0; I<N; I++) {
    C = L[I];
    if (C[length(C)-1] != Prev_color) {
      Prev_color = C[length(C)-1];
      write_to_tb(rtostr(deval(ishift(Prev_color,16)/256)) + " " +
            rtostr(deval(iand(ishift(Prev_color,8),0xff)/256)) + " " +
            rtostr(deval(iand(Prev_color,0xff)/256)) + " setrgbcolor \n",PS);
    }
    if (C[0] == "putpixel") {
       write_to_tb(rtostr(xxx(C[1][0])) + " " + rtostr(yyy(C[1][1])) + " ifplot_putpixel \n",PS);
    }
    if (C[0] == "line") {
       write_to_tb(" newpath ",PS);
       write_to_tb(rtostr(xxx(C[1][0])) + " " + rtostr(yyy(C[1][1])) + " moveto " +
             rtostr(xxx(C[1][2])) + " " + rtostr(yyy(C[1][3])) + " lineto stroke \n",PS);
    }
    if (C[0] == "print") {
       write_to_tb("/Times-Roman findfont 10 scalefont setfont \n",PS);
       write_to_tb(rtostr(xxx(C[1][0])) + " " + rtostr(yyy(C[1][1])) + " moveto ",PS);
       write_to_tb("(" + C[2] + ")  show \n",PS);
    }
  }

  /* Epilog */
  write_to_tb("0 0 0 setrgbcolor \n",PS);
  write_to_tb("showpage \n",PS);

  return tb_to_string(PS);
}

/*&usage begin: glib_ps_form(S)
  It returns the PS code generated by executing {S}
  (experimental).
  example: glib_ps_form(quote( glib_line(0,0,100,100) ));
  example: glib_ps_form(quote([glib_line(0,0,100,100),glib_line(100,0,0,100)]));
  ref: glib_tops
end: */
/* Todo.  Change the canvas size.  */
def glib_ps_form(F) {
  extern Glib_h;
  extern Glib_ps;
  H = Glib_h; /* push Glib_h */
  P = Glib_ps; /* push Glib_ps */

  Glib_ps=1; Glib_h = [];
  if (type(F) != 17) {
    return "Error: argument should be quote(...).";
  }
  eval_quote(F);  
  /* bug. eval_str causes seg fault for ccurve.rr main(8) */
  R = glib_tops();
  Glib_h = H; /* pop Glib_h */
  Glib_ps = P; /* pop Glib_ps */
  return R;
}

/*&usage begin: glib_plot(F)
  It plots an object {F} on the glib canvas.
  example: glib_plot([[0,1],[0.1,0.9],[0.2,0.7],[0.3,0.5],[0.4,0.8]]);
  example: glib_plot(tan(x));
end: */
/* bug, xmin, xmax, color should be optional variables. */
def glib_plot(F) {
  Opt = getopt();
  taka_glib_plot(F,Opt);
}

/*&usage begin: glib_flush();
  Flush the output. 
 (Cfep only. It also set initGL to 1.).
end: */
def glib_flush() {
  extern Glib_canvas;
  if (Glib_canvas < 0) glib_open();
  if (Cfep_loaded && Cfep_use_opengl) cfep.draw_flush(Glib_canvas);
}
/*&usage begin: glib_set_pixel_size(P)
  Set the size of putpixel to P. 1.0 is the default.
 (cfep only).
end: */
def glib_set_pixel_size(X) {
  extern  Glib_canvas;
  if (Glib_canvas < 0) glib_open();
  if ((!Cfep_loaded) || (!Cfep_use_opengl)) /*Not implemented.*/ ;
  else cfep.glib_set_pixel_size(X);
}

/*&usage begin: glib_remove_last()
  Remove the last object.  glib_flush() should also be called to remove
  the last object.
 (cfep only).
end: */
def glib_remove_last() {
  extern  Glib_canvas;
  if (Glib_canvas < 0) glib_open();
  if ((!Cfep_loaded) || (!Cfep_use_opengl)) /*Not implemented.*/ ;
  else cfep.glib_remove_last();
}

if (Cfep_loaded && (!Cfep_use_opengl)) {
  printf("OpenGL is no longer supported on cfep.asir. Use X11 instead.\n")$
}else{;}$

end$