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/*&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 World" | color=0xff0000);
end: */

/* $OpenXM: OpenXM_contrib2/asir2000/lib/glib,v 1.4 2002/07/10 08:40:58 takayama Exp $ */
/* $Id: drill,v 1.9 2000/11/20 01:44:49 taka Exp $ */

/* Todo:
     1. Some functions should be moved to longname
*/

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

/* General sugar functions */
def 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 ox_get_errors(P) {
  ox_push_cmd(P,276);
  return(ox_pop_cmo(P));
}

def reset_plot() {   
  extern Glib_process;
  print("  Sending signal to ox_plot",0);
  ox_reset(Glib_process);
  print("  Done.");
}
Glib_canvas_x = 400$
Glib_canvas_y = 400$
Glib_xmin=0$  Glib_xmax=Glib_canvas_x$
Glib_ymin=0$  Glib_ymax=Glib_canvas_y$
#define START_SERVER \
extern Glib_server_started, Glib_process$ \
if (type(Glib_server_started) == 0) { \
  Glib_process = ox_launch_nox(0,"ox_plot")$ \
  register_handler(reset_plot); \
  Glib_server_started = 1$ \
}$

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

def open_Canvas(P,S) {
  open_canvas(P,S);
  R = ox_pop_cmo(P);
/*
  if (ox_get_errors(P) == []) {
    R = ox_pop_cmo(P);
  }else{
    debug;
  }
*/
  return(R);
}

def glib_open() {
  extern Glib_canvas_x, Glib_canvas_y,
         Glib_process, Glib_canvas;
  START_SERVER  
  Glib_canvas = open_Canvas(Glib_process,[Glib_canvas_x,Glib_canvas_y])$
  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();
  }
  E = 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");
  }
}

def glib_clear() {
  extern Glib_process, Glib_canvas;
  if (Glib_canvas < 0) glib_open();
  clear_canvas(Glib_process,Glib_canvas);
}

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.");
  }
}

def glib_putpixel(X,Y) {
  extern Glib_process, Glib_canvas,
         Glib_xoffset, Glib_yoffset, Glib_xmag, Glib_ymag;
  if (Glib_canvas < 0) glib_open();
  glib_check();
  glib_check_arg(X,Y);
  C = getopt(color);
  if ( type(C) != -1 )
    draw_obj(Glib_process,Glib_canvas,
           [floor(Glib_xmag*(X+Glib_xoffset)),
            floor(Glib_ymag*(Y+Glib_yoffset))],C);
  else
    draw_obj(Glib_process,Glib_canvas,
           [floor(Glib_xmag*(X+Glib_xoffset)),
            floor(Glib_ymag*(Y+Glib_yoffset))]);
}

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(floor(Glib_xmag*(X0+Glib_xoffset)),
                 floor(Glib_ymag*(Y0+Glib_yoffset)),
                 floor(Glib_xmag*(X1+Glib_xoffset)),
                 floor(Glib_ymag*(Y1+Glib_yoffset)),C);
}

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;
  if (Glib_canvas < 0) glib_open();

#ifdef CLIP
#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
#endif
  glib_check();
  if ( type(Color) != -1 )
    draw_obj(Glib_process,Glib_canvas,
           [floor(X0),floor(Y0),floor(X1),floor(Y1)],Color);
  else
    draw_obj(Glib_process,Glib_canvas,
           [floor(X0),floor(Y0),floor(X1),floor(Y1)]);
}

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;
  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 ( type(C) != -1 )
    draw_string(Glib_process,Glib_canvas,
                [X,Y],Text,C);
  else
    draw_string(Glib_process,Glib_canvas,
                [X,Y],Text);
}
end$