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graphics.c

/*
 *      graphics.c          logo graphics module          mak
 *
 *    Copyright (C) 1993 by the Regents of the University of California
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *  
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *  
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#ifdef WIN32
#include <windows.h>
#endif /* WIN32 */

#include "logo.h"
/*   #include "globals.h"   has been moved further down */
#include <math.h>

#ifdef mac
#include "macterm.h"
#elif defined(WIN32)
#include "win32trm.h"
#elif defined(__RZTC__)
#include <fg.h>
#include "ztcterm.h"
#elif defined(x_window)
#include "xgraphics.h"
#elif defined(ibm)
#include "ibmterm.h"
#else
#include "nographics.h"
#endif /* end this whole big huge tree */

#include "globals.h"

#if defined(__RZTC__) && !defined(WIN32) /* sowings */
#define total_turtle_bottom_max (-(MaxY/2))
#else
#define total_turtle_bottom_max turtle_bottom_max
#endif

/* types of graphics moves that can be recorded */
#define LINEXY         1
#define MOVEXY         2
#define LABEL          3
#define SETPENVIS      4
#define SETPENMODE     5
#define SETPENCOLOR    6
#define SETPENSIZE     7
#define SETPENPATTERN  8
#define FILLERUP       9
#define ARC       10

/* NOTE: See the files (macterm.c and macterm.h) or (ibmterm.c and ibmterm.h)
   for examples of the functions and macros that this file assumes exist. */

#define One (sizeof(int))
#define Two (2*One)
#define Three (3*One)
#define Big (sizeof(FLONUM))

#define PENMODE_PAINT   0
#define PENMODE_ERASE   1
#define PENMODE_REVERSE 2

int internal_penmode = PENMODE_PAINT;

mode_type current_mode = wrapmode;
FLONUM turtle_x = 0.0, turtle_y = 0.0, turtle_heading = 0.0;
FLONUM x_scale = 1.0, y_scale = 1.0;
BOOLEAN turtle_shown = TRUE;
FLONUM wanna_x = 0.0, wanna_y = 0.0;
BOOLEAN out_of_bounds = FALSE;
void setpos_bynumber(FLONUM, FLONUM);

int max_palette_slot = 0;

char record[GR_SIZE];
FIXNUM record_index = 0;
pen_info orig_pen;

BOOLEAN refresh_p = TRUE;

/************************************************************/

double pfmod(double x, double y) {
    double temp = fmod(x,y);

    if (temp < 0) return temp+y;
    return temp;
}

FLONUM cut_error(FLONUM n) {
    n *= 1000000;
    n = (n > 0 ? floor(n) : ceil(n));
    n /= 1000000;
    if (n == -0.0) n = 0.0;
    return(n);
}

FIXNUM g_round(FLONUM n) {
    n += (n < 0.0 ? -0.5 : 0.5);
    if (n < 0.0)
      return((FIXNUM)ceil(n));
    return((FIXNUM)floor(n));
}

/************************************************************/
void draw_turtle_helper(void);
void check_x_high(void);
void check_x_low(void);

void draw_turtle(void) {
    unsigned int r=0, g=0, b=0, old_color=pen_color;

    if (!turtle_shown) return;
    get_palette(pen_color, &r, &g, &b);
    if (r==0 && g==0 && b==0) {
      turtle_shown = 0;
      set_pen_color(7);
      turtle_shown = 1;
    }
    draw_turtle_helper();
    /* all that follows is for "turtle wrap" effect */
    if ((turtle_y > turtle_top_max - turtle_height) &&
          (current_mode == wrapmode)) {
      turtle_y -= (screen_height + 1);
      draw_turtle_helper();
      check_x_high();
      check_x_low();
      turtle_y += (screen_height + 1);
    }
    if ((turtle_y < turtle_bottom_max + turtle_height) &&
          (current_mode == wrapmode)) {
      turtle_y += (screen_height + 1);
      draw_turtle_helper();
      check_x_high();
      check_x_low();
      turtle_y -= (screen_height + 1);
    }
    check_x_high();
    check_x_low();
    turtle_shown = 0;
    set_pen_color(old_color);
    turtle_shown = 1;
}

void check_x_high(void) {
    if ((turtle_x > turtle_right_max - turtle_height) &&
          (current_mode == wrapmode)) {
      turtle_x -= (screen_width + 1);
      draw_turtle_helper();
      turtle_x += (screen_width + 1);
    }
}

void check_x_low(void) {
    if ((turtle_x < turtle_left_max + turtle_height) &&
          (current_mode == wrapmode)) {
      turtle_x += (screen_width + 1);
      draw_turtle_helper();
      turtle_x -= (screen_width + 1);
    }
}
void draw_turtle_helper(void) {
    pen_info saved_pen;
    FLONUM real_heading;
    int left_x, left_y, right_x, right_y, top_x, top_y;
#if 1 /* Evan Marshall Manning <manning@alumni.caltech.edu> */
    double cos_real_heading, sin_real_heading;
    FLONUM delta_x, delta_y;
#endif
   
    prepare_to_draw;
    prepare_to_draw_turtle;
    save_pen(&saved_pen);
    plain_xor_pen();
    pen_vis = 0;
    set_pen_width(1);
    set_pen_height(1);
   
    real_heading = -turtle_heading + 90.0;
 
#if 0
    left_x = g_round(turtle_x + x_scale*(FLONUM)(cos((FLONUM)((real_heading + 90.0)*degrad))*turtle_half_bottom));
    left_y = g_round(turtle_y + y_scale*(FLONUM)(sin((FLONUM)((real_heading + 90.0)*degrad))*turtle_half_bottom));
 
    right_x = g_round(turtle_x + x_scale*(FLONUM)(cos((FLONUM)((real_heading - 90.0)*degrad))*turtle_half_bottom));
    right_y = g_round(turtle_y + y_scale*(FLONUM)(sin((FLONUM)((real_heading - 90.0)*degrad))*turtle_half_bottom));
 
    top_x = g_round(turtle_x + x_scale*(FLONUM)(cos((FLONUM)(real_heading*degrad))*turtle_side));
    top_y = g_round(turtle_y + y_scale*(FLONUM)(sin((FLONUM)(real_heading*degrad))*turtle_side));
#else
    cos_real_heading = cos((FLONUM)(real_heading*degrad));
    sin_real_heading = sin((FLONUM)(real_heading*degrad));
 
    delta_x = x_scale*(FLONUM)(sin_real_heading*turtle_half_bottom);
    delta_y = y_scale*(FLONUM)(cos_real_heading*turtle_half_bottom);
 
    left_x = g_round(turtle_x - delta_x);
    left_y = g_round(turtle_y + delta_y);
 
    right_x = g_round(turtle_x + delta_x);
    right_y = g_round(turtle_y - delta_y);
 
    top_x = g_round(turtle_x + x_scale*(FLONUM)(cos_real_heading*turtle_side));
    top_y = g_round(turtle_y + y_scale*(FLONUM)(sin_real_heading*turtle_side));
#endif
 
#if 0
    /* move to left, draw to top; move to right, draw to top; move to left draw to right */
    move_to(screen_x_center + left_x, screen_y_center - left_y);
    line_to(screen_x_center + top_x, screen_y_center - top_y);
    move_to(screen_x_center + right_x, screen_y_center - right_y);
    line_to(screen_x_center + top_x, screen_y_center - top_y);
    move_to(screen_x_center + left_x, screen_y_center - left_y);
    line_to(screen_x_center + right_x, screen_y_center - right_y);
#else
    /* move to right, draw to left, draw to top, draw to right */
    move_to(screen_x_center + right_x, screen_y_center - right_y);
    line_to(screen_x_center + left_x, screen_y_center - left_y);
    line_to(screen_x_center + top_x, screen_y_center - top_y);
    line_to(screen_x_center + right_x, screen_y_center - right_y);
#endif
 
    restore_pen(&saved_pen);
    done_drawing_turtle;
    done_drawing;
}

/************************************************************/
void forward_helper(FLONUM);
BOOLEAN safe_to_save(void);
void save_line(void), save_move(void), save_vis(void), save_mode(void);
void save_color(void), save_size(void), save_pattern(void);
void save_string(char *, int);
void save_arc(FLONUM, FLONUM, FLONUM, FLONUM, FLONUM, FLONUM, FLONUM, FLONUM);

void right(FLONUM a) {
    draw_turtle();
    turtle_heading += a;
    turtle_heading = pfmod(turtle_heading,360.0);
    draw_turtle();
}

NODE *numeric_arg(NODE *args) {
    NODE *arg = car(args), *val;

    val = cnv_node_to_numnode(arg);
    while (val == UNBOUND && NOT_THROWING) {
      setcar(args, err_logo(BAD_DATA, arg));
      arg = car(args);
      val = cnv_node_to_numnode(arg);
    }
    setcar(args,val);
    return(val);
}

NODE *lright(NODE *arg) {
    NODE *val;
    FLONUM a;
    
    val = numeric_arg(arg);
    if (NOT_THROWING) {
      if (nodetype(val) == INT)
          a = (FLONUM)getint(val);
      else
          a = getfloat(val);
      right(a);
    }
    return(UNBOUND);
}

NODE *lleft(NODE *arg) {
    NODE *val;
    FLONUM a;
    
    val = numeric_arg(arg);
    if (NOT_THROWING) {
      if (nodetype(val) == INT)
          a = (FLONUM)getint(val);
      else
          a = getfloat(val);
      right(-a);
    }
    return(UNBOUND);
}

FLONUM wrap_right(FLONUM, FLONUM, FLONUM, FLONUM, FLONUM);
FLONUM wrap_left(FLONUM, FLONUM, FLONUM, FLONUM, FLONUM);
FLONUM wrap_up(FLONUM, FLONUM, FLONUM, FLONUM, FLONUM);
FLONUM wrap_down(FLONUM, FLONUM, FLONUM, FLONUM, FLONUM);

void forward(FLONUM d) {
    prepare_to_draw;
    draw_turtle();
    forward_helper(d);
    draw_turtle();
    done_drawing;
    wanna_x = turtle_x;
    wanna_y = turtle_y;
    out_of_bounds = FALSE;
}

void forward_helper(FLONUM d) {
    FLONUM real_heading, dx, dy, x1, y1, x2, y2, newd = 0.0;
    FIXNUM rx2, ry2;

wraploop:
    if (newd != 0.0) d = newd;
    real_heading = -turtle_heading + 90.0;
    x1 = screen_x_coord;
    y1 = screen_y_coord;
    dx = (FLONUM)(cos((FLONUM)(real_heading*degrad))*d*x_scale);
    dy = (FLONUM)(sin((FLONUM)(real_heading*degrad))*d*y_scale);
    if ((dx < 0 && dx > -0.000001) || (dx > 0 && dx < 0.000001)) dx = 0;
    if ((dy < 0 && dy > -0.000001) || (dy > 0 && dy < 0.000001)) dy = 0;
    x2 = x1 + dx;
    y2 = y1 - dy;
    
    move_to(g_round(x1), g_round(y1));
    save_move();
    
    if (check_throwing) return;

    if (internal_penmode == PENMODE_REVERSE && pen_vis == 0 && d > 0.0) {
      line_to(g_round(x1), g_round(y1));  /* flip the corner */
      save_line();
    }

    rx2 = g_round(x2);
    ry2 = g_round(y2);

    if (current_mode == windowmode ||
      (rx2 >= screen_left && rx2 <= screen_right &&
       ry2 >= screen_top && ry2 <= screen_bottom)) {
      turtle_x = turtle_x + dx;
      turtle_y = turtle_y + dy;
      line_to(rx2, ry2);
      save_line();
    } else {
      if (rx2 > screen_right && g_round(x1) == screen_right) {
          move_to(screen_left, g_round(y1));
          turtle_x = turtle_left_max;
          goto wraploop;
      }
      if (ry2 < screen_top && g_round(y1) == screen_top) {
          move_to(g_round(x1), screen_bottom);
          turtle_y = turtle_bottom_max;
          goto wraploop;
      }
      if (rx2 < screen_left && g_round(x1) == screen_left) {
          move_to(screen_right, g_round(y1));
          turtle_x = turtle_right_max;
          goto wraploop;
      }
      if (ry2 > screen_bottom && g_round(y1) == screen_bottom) {
          move_to(g_round(x1), screen_top);
          turtle_y = turtle_top_max;
          goto wraploop;
      }
      if ((newd = wrap_right(d, x1, y1, x2, y2)) != 0.0) goto wraploop;
      if ((newd = wrap_left(d, x1, y1, x2, y2)) != 0.0) goto wraploop;
      if ((newd = wrap_up(d, x1, y1, x2, y2)) != 0.0) goto wraploop;
      if ((newd = wrap_down(d, x1, y1, x2, y2)) != 0.0) goto wraploop;
    }

    if (internal_penmode == PENMODE_REVERSE && pen_vis == 0 && d < 0.0) {
      line_to(g_round(screen_x_coord), g_round(screen_y_coord));
      save_line();
    }
}

FLONUM wrap_right(FLONUM d, FLONUM x1, FLONUM y1, FLONUM x2, FLONUM y2) {
    FLONUM yi, newd;
    FIXNUM ryi;
    
    if (x2 > screen_right) {
      yi = ((y2 - y1)/(x2 - x1)) * (screen_right + 1 - x1) + y1;
      ryi = g_round(yi);
      if (ryi >= screen_top && ryi <= screen_bottom) {
          line_to(screen_right, ryi);
          save_line();
          turtle_x = turtle_left_max;
          turtle_y = screen_y_center - yi;
          if (current_mode == wrapmode) {
            newd = d * ((x2 - screen_right - 1)/(x2 - x1));
            if (newd*d > 0) return(newd);
          } else {
            turtle_x = turtle_right_max;
            err_logo(TURTLE_OUT_OF_BOUNDS, NIL);
          }
      }
    }
    return(0.0);
}

FLONUM wrap_left(FLONUM d, FLONUM x1, FLONUM y1, FLONUM x2, FLONUM y2) {
    FLONUM yi, newd;
    FIXNUM ryi;
    
    if (x2 < screen_left) {
      yi = ((y1 - y2)/(x2 - x1)) * (x1 + 1 - screen_left) + y1;
      ryi = g_round(yi);
      if (ryi >= screen_top && ryi <= screen_bottom) {
          line_to(screen_left, ryi);
          save_line();
          turtle_x = turtle_right_max;
          turtle_y = screen_y_center - yi;
          if (current_mode == wrapmode) {
            newd = d * ((x2 + 1 - screen_left)/(x2 - x1));
            if (newd*d > 0) return(newd);
          } else {
            turtle_x = turtle_left_max;
            err_logo(TURTLE_OUT_OF_BOUNDS, NIL);          
          }
      }
    }
    return(0.0);
}

FLONUM wrap_up(FLONUM d, FLONUM x1, FLONUM y1, FLONUM x2, FLONUM y2) {
    FLONUM xi, newd;
    FIXNUM rxi;

    if (y2 < screen_top) {
      xi = ((x2 - x1)/(y1 - y2)) * (y1 + 1 - screen_top) + x1;
      rxi = g_round(xi);
      if (rxi >= screen_left && rxi <= screen_right) {
          line_to(rxi, screen_top);
          save_line();
          turtle_x = xi - screen_x_center;
          turtle_y = turtle_bottom_max;
          if (current_mode == wrapmode) {
            newd = d * ((y2 + 1 - screen_top)/(y2 - y1));
            if (newd*d > 0) return(newd);
          } else {
            turtle_y = turtle_top_max;
            err_logo(TURTLE_OUT_OF_BOUNDS, NIL);
          }
      } else if (rxi >= (screen_left-1) && rxi <= (screen_right+1)) {
          rxi = (rxi > screen_right ? screen_right : screen_left);
          line_to(rxi, screen_top);
          save_line();
          turtle_x = xi - screen_x_center;
          turtle_y = turtle_bottom_max;
          if (current_mode == wrapmode) {
            newd = d * ((y2 + 1 - screen_top)/(y2 - y1));
            if (newd*d > 0) return(newd);
          } else {
            turtle_y = turtle_top_max;
            err_logo(TURTLE_OUT_OF_BOUNDS, NIL);
          }
      }
    }
    return(0.0);
}

FLONUM wrap_down(FLONUM d, FLONUM x1, FLONUM y1, FLONUM x2, FLONUM y2) {
    FLONUM xi, newd;
    FIXNUM rxi;
    
    if (y2 > screen_bottom) {
      xi = ((x2 - x1)/(y2 - y1)) * (screen_bottom + 1 - y1) + x1;
      rxi = g_round(xi);
      if (rxi >= screen_left && rxi <= screen_right) {
          line_to(rxi, screen_bottom);
          save_line();
          turtle_x = xi - screen_x_center;
          turtle_y = turtle_top_max;
          if (current_mode == wrapmode) {
            newd = d * ((y2 - screen_bottom - 1)/(y2 - y1));
            if (newd*d > 0) return(newd);
          } else {
            turtle_y = turtle_bottom_max;
            err_logo(TURTLE_OUT_OF_BOUNDS, NIL);
          }
      } else if (rxi >= (screen_left-1) && rxi <= (screen_right+1)) {
          rxi = (rxi > screen_right ? screen_right : screen_left);
          line_to(rxi, screen_bottom);
          save_line();
          turtle_x = xi - screen_x_center;
          turtle_y = turtle_top_max;
          if (current_mode == wrapmode) {
            newd = d * ((y2 - screen_bottom - 1)/(y2 - y1));
            if (newd*d > 0) return(newd);
          } else {
            turtle_y = turtle_bottom_max;
            err_logo(TURTLE_OUT_OF_BOUNDS, NIL);
          }
      }
    }
    return(0.0);
}

NODE *lforward(NODE *arg) {
    NODE *val;
    FLONUM d;
    
    val = numeric_arg(arg);
    if (NOT_THROWING) {
      if (nodetype(val) == INT)
          d = (FLONUM)getint(val);
      else
          d = getfloat(val);
      forward(d);
    }
    return(UNBOUND);
}

NODE *lback(NODE *arg) {
    NODE *val;
    FLONUM d;
    
    val = numeric_arg(arg);
    if (NOT_THROWING) {
      if (nodetype(val) == INT)
          d = (FLONUM)getint(val);
      else
          d = getfloat(val);
      forward(-d);
    }
    return(UNBOUND);
}

NODE *lshowturtle(NODE *args) {
    prepare_to_draw;
    if (!turtle_shown) {
      turtle_shown = TRUE;
      draw_turtle();
    }
    done_drawing;
    return(UNBOUND);
}

NODE *lhideturtle(NODE *args) {
    prepare_to_draw;
    if (turtle_shown) {
      draw_turtle();
      turtle_shown = FALSE;
    }
    done_drawing;
    return(UNBOUND);
}

NODE *lshownp(NODE *args) {
    return(turtle_shown ? TrueName() : FalseName());
}

NODE *lsetheading(NODE *arg) {
    NODE *val;
    
    val = numeric_arg(arg);
    if (NOT_THROWING) {
      draw_turtle();
      if (nodetype(val) == INT)
          turtle_heading = (FLONUM)getint(val);
      else
          turtle_heading = getfloat(val);
      turtle_heading = pfmod(turtle_heading,360.0);
      draw_turtle();
    }
    return(UNBOUND);
}

NODE *lheading(NODE *args) {
    return(make_floatnode(turtle_heading));
}

NODE *vec_arg_helper(NODE *args, BOOLEAN floatok, BOOLEAN three) {
    NODE *arg = car(args), *val1, *val2, *val3 = NIL;

    while (NOT_THROWING) {
      if (arg != NIL &&
      is_list(arg) &&
      cdr(arg) != NIL &&
      (three ? (cddr(arg) != NIL && cdr(cddr(arg)) == NIL) : cddr(arg) == NIL)) {
          val1 = cnv_node_to_numnode(car(arg));
          val2 = cnv_node_to_numnode(cadr(arg));
            if (three) val3 = cnv_node_to_numnode(car(cddr(arg)));
          if (val1 != UNBOUND && val2 != UNBOUND &&
            (floatok || (nodetype(val1) == INT && getint(val1) >= 0 &&
                       nodetype(val2) == INT && getint(val2) >= 0 &&
                         (!three || (nodetype(val3) == INT && getint(val3) >= 0))))) {
            setcar(arg, val1);
            setcar(cdr(arg), val2);
            if (three) setcar (cddr(arg), val3);
            return(arg);
          }
      }
      setcar(args, err_logo(BAD_DATA, arg));
      arg = car(args);
    }
    return(UNBOUND);
}

NODE *vector_arg(NODE *args) {
    return vec_arg_helper(args,TRUE,FALSE);
}

NODE *pos_int_vector_arg(NODE *args) {
    return vec_arg_helper(args,FALSE,FALSE);
}

NODE *rgb_arg(NODE *args) {
      return vec_arg_helper(args,FALSE,TRUE);
}

FLONUM towards_helper(FLONUM x, FLONUM y, FLONUM from_x, FLONUM from_y) {
    FLONUM m, a, tx, ty;

    tx = from_x/x_scale;
    ty = from_y/y_scale;

    if (x != tx || y != ty) {
      if (x == tx)
          a = (y < ty) ? -90 : 90;
      else {
          m = (y - ty)/(x - tx);
          a = atan(m)/degrad;
          if (x < tx) a = fmod(a + 180.0,360.0);
      }
      a = -(a - 90.0);
      return (a < 0 ? 360.0+a : a);
    }
    return 0.0;
}

NODE *ltowards(NODE *args) {
    NODE *xnode, *ynode = UNBOUND, *arg;
    FLONUM x, y;
    
    arg = vector_arg(args);
    if (NOT_THROWING) {
      xnode = car(arg);
      ynode = cadr(arg);
      
      x = ((nodetype(xnode) == FLOATT) ? getfloat(xnode) :
                    (FLONUM)getint(xnode));
      y = ((nodetype(ynode) == FLOATT) ? getfloat(ynode) :
                    (FLONUM)getint(ynode));
      return make_floatnode(towards_helper(x, y, turtle_x, turtle_y));
    }
    return(UNBOUND);
}

NODE *lpos(NODE *args) {
    return(cons(make_floatnode(cut_error(turtle_x/x_scale)),
      cons(make_floatnode(cut_error(turtle_y/y_scale)), NIL)));
}

NODE *lscrunch(NODE *args) {
    return(cons(make_floatnode(x_scale), cons(make_floatnode(y_scale), NIL)));
}

NODE *lhome(NODE *args) {
    out_of_bounds = FALSE;
    setpos_bynumber((FLONUM)0.0, (FLONUM)0.0);
    draw_turtle();
    turtle_heading = 0.0;
    draw_turtle();
    return(UNBOUND);
}

void cs_helper(int centerp) {    
    prepare_to_draw;
    clear_screen;
    if (centerp) {
      wanna_x = wanna_y = turtle_x = turtle_y = turtle_heading = 0.0;
      out_of_bounds = FALSE;
      move_to(screen_x_coord, screen_y_coord);
    }
    draw_turtle();
    save_pen(&orig_pen);
    p_info_x(orig_pen) = g_round(screen_x_coord);
    p_info_y(orig_pen) = g_round(screen_y_coord);
    record_index = 0;
    if (turtle_x != 0.0 || turtle_y != 0.0) save_move();
    if (pen_vis != 0) save_vis();
    if (internal_penmode != PENMODE_PAINT) save_mode();
    if (pen_color != 7) save_color();
    if (pen_width != 1 || pen_height != 1) save_size();
    done_drawing;
}

NODE *lclearscreen(NODE *args) {
    cs_helper(TRUE);
    return(UNBOUND);
}

NODE *lclean(NODE *args) {
    cs_helper(FALSE);
    return(UNBOUND);
}

void setpos_commonpart(FLONUM target_x, FLONUM target_y) {
    FLONUM scaled_x, scaled_y, tx, ty, save_heading;
    BOOLEAN wrapping = FALSE;
    
    if (NOT_THROWING) {
      scaled_x = target_x * x_scale;
      scaled_y = target_y * y_scale;
      wrapping = scaled_x > turtle_right_max || scaled_x < turtle_left_max ||
               scaled_y > turtle_top_max || scaled_y < turtle_bottom_max;
      if (current_mode == fencemode && wrapping)
          err_logo(TURTLE_OUT_OF_BOUNDS, NIL);
      else if (current_mode == wrapmode && (wrapping || out_of_bounds)) {
          save_heading = turtle_heading;
          turtle_heading = towards_helper(target_x, target_y,
                                  wanna_x, wanna_y);
          tx = wanna_x/x_scale;
          ty = wanna_y/y_scale;
#define sq(z) ((z)*(z))
          forward_helper(sqrt(sq(target_x - tx) + sq(target_y - ty)));
          turtle_heading = save_heading;
          wanna_x = scaled_x;
          wanna_y = scaled_y;
          out_of_bounds = wrapping;
      }
      else {
          out_of_bounds = FALSE;
          wanna_x = turtle_x = scaled_x;
          wanna_y = turtle_y = scaled_y;
          line_to(g_round(screen_x_coord),
                g_round(screen_y_coord));
          save_line();
      }
      done_drawing;
      draw_turtle();
    }
}

void setpos_bynumber(FLONUM target_x, FLONUM target_y) {
    if (NOT_THROWING) {
      prepare_to_draw;
      draw_turtle();
      move_to(g_round(screen_x_coord), g_round(screen_y_coord));
      setpos_commonpart(target_x, target_y);
    }
}

void setpos_helper(NODE *xnode, NODE *ynode) {
    FLONUM target_x, target_y;
    
    if (NOT_THROWING) {
      prepare_to_draw;
      draw_turtle();
      move_to(g_round(screen_x_coord), g_round(screen_y_coord));
      target_x = ((xnode == NIL) ?
            turtle_x :
            ((nodetype(xnode) == FLOATT) ? getfloat(xnode) :
             (FLONUM)getint(xnode)));
      target_y = ((ynode == NIL) ?
            turtle_y :
            ((nodetype(ynode) == FLOATT) ? getfloat(ynode) :
             (FLONUM)getint(ynode)));
      setpos_commonpart(target_x, target_y);
    }
}

NODE *lsetpos(NODE *args) {
    NODE *arg = vector_arg(args);

    if (NOT_THROWING) {
      setpos_helper(car(arg), cadr(arg));
    }
    return(UNBOUND);
}

NODE *lsetxy(NODE *args) {
    NODE *xnode, *ynode;
    
    xnode = numeric_arg(args);
    ynode = numeric_arg(cdr(args));
    if (NOT_THROWING) {
      setpos_helper(xnode, ynode);
    }
    return(UNBOUND);
}

NODE *lsetx(NODE *args) {
    NODE *xnode;
    
    xnode = numeric_arg(args);
    if (NOT_THROWING) {
      setpos_helper(xnode, NIL);
    }
    return(UNBOUND);
}

NODE *lsety(NODE *args) {
    NODE *ynode;
    
    ynode = numeric_arg(args);
    if (NOT_THROWING) {
      setpos_helper(NIL, ynode);
    }
    return(UNBOUND);
}

NODE *lwrap(NODE *args) {
    draw_turtle();
    current_mode = wrapmode;
    while (turtle_x > turtle_right_max) {
      turtle_x -= screen_width;
    }
    while (turtle_x < turtle_left_max) {
      turtle_x += screen_width;
    }
    while (turtle_y > turtle_top_max) {
      turtle_y -= screen_height;
    }
    while (turtle_y < turtle_bottom_max) {
      turtle_y += screen_height;
    }
    move_to(screen_x_coord, screen_y_coord);
    draw_turtle();
    return(UNBOUND);
}

NODE *lfence(NODE *args) {
    (void)lwrap(args);      /* get turtle inside the fence */
    draw_turtle();
    current_mode = fencemode;
    draw_turtle();
    return(UNBOUND);
}

NODE *lwindow(NODE *args) {
    draw_turtle();
    current_mode = windowmode;
    draw_turtle();
    return(UNBOUND);
}


NODE *lturtlemode(NODE *args) {
    switch (current_mode) {
      case wrapmode: return(theName(Name_wrap));
      case fencemode: return(theName(Name_fence));
      case windowmode: return(theName(Name_window));
    }
}

NODE *lfill(NODE *args) {
    draw_turtle();
    logofill();
    draw_turtle();
    if (safe_to_save()) {
      record[record_index] = FILLERUP;
      record_index += One;
    }
    return(UNBOUND);
}

NODE *llabel(NODE *arg) {
    char textbuf[300];
    short theLength;

    print_stringptr = textbuf;
    print_stringlen = 300;
    ndprintf((FILE *)NULL,"%p",car(arg));
    *print_stringptr = '\0';
      
    if (NOT_THROWING) {
      prepare_to_draw;
      draw_turtle();
      theLength = strlen(textbuf);
#ifdef mac
      c_to_pascal_string(textbuf, theLength);
#endif
      label(textbuf);
      save_string(textbuf,theLength);
      draw_turtle();
      done_drawing;
    }
    return(UNBOUND);
}

enum {SCREEN_TEXT, SCREEN_SPLIT, SCREEN_FULL} screen_mode = SCREEN_TEXT;

NODE *ltextscreen(NODE *args) {
    text_screen;
    screen_mode = SCREEN_TEXT;
    return(UNBOUND);
}

NODE *lsplitscreen(NODE *args) {
    split_screen;
    screen_mode = SCREEN_SPLIT;
    return(UNBOUND);
}

NODE *lfullscreen(NODE *args) {
    full_screen;
    screen_mode = SCREEN_FULL;
    return(UNBOUND);
}

NODE *lscreenmode(NODE *args) {
    switch (screen_mode) {
      case SCREEN_TEXT: return(theName(Name_textscreen));
      case SCREEN_SPLIT: return(theName(Name_splitscreen));
      case SCREEN_FULL: return(theName(Name_fullscreen));
    }
}

NODE *lpendownp(NODE *args) {
    return(pen_vis == 0 ? TrueName() : FalseName());
}

NODE *lpencolor(NODE *args) {
    return(make_intnode((FIXNUM)pen_color));
}

NODE *lbackground(NODE *args) {
    return(make_intnode((FIXNUM)back_ground));
}

NODE *lpensize(NODE *args) {
    return(cons(make_intnode((FIXNUM)pen_width),
      cons(make_intnode((FIXNUM)pen_height), NIL)));
}

NODE *lpenpattern(NODE *args) {
    return(get_node_pen_pattern);
}

NODE *lpendown(NODE *args) {
    pen_vis = 0;
    save_vis();
    return(UNBOUND);
}

NODE *lpenup(NODE *args) {
    if (pen_vis == 0)
      pen_vis--;
    save_vis();
    return(UNBOUND);
}

NODE *lpenpaint(NODE *args) {
    internal_penmode = PENMODE_PAINT;
    pen_down;
    save_mode();
    return(lpendown(NIL));
}

NODE *lpenerase(NODE *args) {
    internal_penmode = PENMODE_ERASE;
    pen_erase;
    save_mode();
    return(lpendown(NIL));
}

NODE *lpenreverse(NODE *args) {
    internal_penmode = PENMODE_REVERSE;
    pen_reverse;
    save_mode();
    return(lpendown(NIL));
}

NODE *lpenmode(NODE *args) {
    switch(internal_penmode) {
      case PENMODE_PAINT: return theName(Name_paint);
      case PENMODE_ERASE: return theName(Name_erase);
      case PENMODE_REVERSE: return theName(Name_reverse);
    }
}

NODE *lsetpencolor(NODE *arg) {
    NODE *val = pos_int_arg(arg);

    if (NOT_THROWING) {
      prepare_to_draw;
      set_pen_color(getint(val));
      save_color();
      done_drawing;
    }
    return(UNBOUND);
}

NODE *lsetbackground(NODE *arg) {
    NODE *val = pos_int_arg(arg);

    if (NOT_THROWING) {
      prepare_to_draw;
      set_back_ground(getint(val));
      done_drawing;
    }
    return(UNBOUND);
}

NODE *lsetpalette(NODE *args) {
      NODE *slot = pos_int_arg(args);
      NODE *arg = rgb_arg(cdr(args));
      int slotnum = (int)getint(slot);

      if (NOT_THROWING && (slotnum > 7)) {
            prepare_to_draw;
            set_palette(slotnum,
                      (unsigned int)getint(car(arg)),
                      (unsigned int)getint(cadr(arg)),
                      (unsigned int)getint(car(cddr(arg))));
            done_drawing;
            if (slotnum > max_palette_slot) max_palette_slot = slotnum;
      }
      return(UNBOUND);
}

NODE *lpalette(NODE *args) {
      NODE *arg = pos_int_arg(args);
      unsigned int r=0, g=0, b=0;

      if (NOT_THROWING) {
            get_palette((int)getint(arg), &r, &g, &b);
            return cons(make_intnode((FIXNUM)r),
                              cons(make_intnode((FIXNUM)g),
                                     cons(make_intnode((FIXNUM)b), NIL)));
      }
      return UNBOUND;
}

void save_palette(FILE *fp) {
    unsigned int colors[3];
    int i;
    fwrite(&max_palette_slot, sizeof(int), 1, fp);
    for (i=8; i <= max_palette_slot; i++) {
      get_palette(i, &colors[0], &colors[1], &colors[2]);
      fwrite(colors, sizeof(int), 3, fp);
    }
}

void restore_palette(FILE *fp) {
    unsigned int colors[3];
    int i, nslots;
    fread(&nslots, sizeof(int), 1, fp);
    if (nslots > max_palette_slot) max_palette_slot = nslots;
    for (i=8; i <= nslots; i++) {
      fread(colors, sizeof(int), 3, fp);
      set_palette(i, colors[0], colors[1], colors[2]);
    }
}

NODE *lsetpensize(NODE *args) {
    NODE *arg = pos_int_vector_arg(args);

    if (NOT_THROWING) {
      prepare_to_draw;
      set_pen_width((int)getint(car(arg)));
      set_pen_height((int)getint(cadr(arg)));
      save_size();
      done_drawing;
    }
    return(UNBOUND);
}

NODE *lsetpenpattern(NODE *args) {    
    NODE *arg;

    arg = car(args);
    while ((!is_list(arg)) && NOT_THROWING)
      arg = err_logo(BAD_DATA, arg);
      
    if (NOT_THROWING) {
      prepare_to_draw;
      set_list_pen_pattern(arg);
      save_pattern();
      done_drawing;
    }

    return(UNBOUND);
}

NODE *lsetscrunch(NODE *args) {
    NODE *xnode, *ynode;

    xnode = numeric_arg(args);
    ynode = numeric_arg(cdr(args));

    if (NOT_THROWING) {
      prepare_to_draw;
      draw_turtle();
      x_scale = (nodetype(xnode) == FLOATT) ? getfloat(xnode) :
                         (FLONUM)getint(xnode);
      y_scale = (nodetype(ynode) == FLOATT) ? getfloat(ynode) :
                         (FLONUM)getint(ynode);
      draw_turtle();
      done_drawing;
#ifdef __RZTC__
      {
          FILE *fp = fopen("scrunch.dat","r");
          if (fp != NULL) {
            fclose(fp);
            fp = fopen("scrunch.dat","w");
            if (fp != NULL) {
                fwrite(&x_scale, sizeof(FLONUM), 1, fp);
                fwrite(&y_scale, sizeof(FLONUM), 1, fp);
                fclose(fp);
            }
          }
      }
#endif
    }
    return(UNBOUND);
}

NODE *lmousepos(NODE *args) {
#ifdef WIN32 /* sowings */
    return NIL;
#else
    return(cons(make_intnode(mouse_x), cons(make_intnode(mouse_y), NIL)));
#endif
}

NODE *lbuttonp(NODE *args) {
    if (button)
      return(TrueName());
    return(FalseName());
}

NODE *ltone(NODE *args) {
    NODE *p, *d;
    FIXNUM pitch, duration;
    
    p = numeric_arg(args);
    d = numeric_arg(cdr(args));
    
    if (NOT_THROWING) {
      pitch = (nodetype(p) == FLOATT) ? (FIXNUM)getfloat(p) : getint(p);
      duration = (nodetype(d) == FLOATT) ? (FIXNUM)getfloat(d) : getint(d);
      if (pitch > 0) tone(pitch, duration);
    }
    return(UNBOUND);
}

void do_arc(FLONUM count, FLONUM ang, FLONUM radius, FLONUM delta,
          FLONUM tx, FLONUM ty, FLONUM angle, FLONUM thead, BOOLEAN save) {
    FLONUM x;
    FLONUM y;
    FLONUM i;
    BOOLEAN save_refresh = refresh_p;
    FLONUM save_x = turtle_x;
    FLONUM save_y = turtle_y;
    int pen_state;

    refresh_p = 0;
    if (save) {
      x = sin(ang*3.141592654/180.0)*radius;
      y = cos(ang*3.141592654/180.0)*radius;
      turtle_x = tx+x;
      turtle_y = ty+y;
    }

    /* draw each line segment of arc (will do wrap) */

    for (i=1.0;i<=count;i=i+1.0) {

       /* calc x y */

       x = sin(ang*3.141592654/180.0)*radius;
       y = cos(ang*3.141592654/180.0)*radius;
       setpos_bynumber(tx+x, ty+y);
       ang = ang + delta;
    }

    /* assure we draw something and end in the exact right place */

    x = sin((thead+angle)*3.141592654/180.0)*radius;
    y = cos((thead+angle)*3.141592654/180.0)*radius;

    setpos_bynumber(tx+x, ty+y);

    if (save) {
      pen_state = pen_vis;
      pen_vis = -1;
      setpos_bynumber(tx, ty);
      pen_vis = pen_state;
      turtle_x = save_x;
      turtle_y = save_y;
    }
    refresh_p = save_refresh;
}

NODE *larc(NODE *arg) {
    NODE *val1;
    NODE *val2;

    FLONUM angle;
    FLONUM radius;
    FLONUM ang;
    FLONUM tx;
    FLONUM ty;
    FLONUM count;
    FLONUM delta;
    FLONUM x;
    FLONUM y;

    int turtle_state;
    int pen_state;
    
    /* get args */

    val1 = numeric_arg(arg);
    val2 = numeric_arg(cdr(arg));

    if (NOT_THROWING) {

      if (nodetype(val1) == INT)
          angle = (FLONUM)getint(val1);
      else
          angle = getfloat(val1);

      if (nodetype(val2) == INT)
          radius = (FLONUM)getint(val2);
      else
          radius = getfloat(val2);

      prepare_to_draw;
      draw_turtle();

      /* save and force turtle state */

      turtle_state = turtle_shown;
      turtle_shown = 0;

      /* grab things before they change and use for restore */

      ang = turtle_heading;
      tx = turtle_x;
      ty = turtle_y;

      /* calculate resolution parameters */

      count = fabs(angle*radius/200.0);   /* 4.5 */
      if (count == 0.0) count = 1.0;
      delta = angle/count;

      /* jump to begin of first line segment without drawing */

      x = sin(ang*3.141592654/180.0)*radius;
      y = cos(ang*3.141592654/180.0)*radius;

      pen_state = pen_vis;
      pen_vis = -1;
      save_vis();
      setpos_bynumber(tx+x, ty+y);
      pen_vis = pen_state;
      save_vis();
      ang = ang + delta;

      save_arc(count, ang, radius, delta, tx, ty, angle, turtle_heading);

      do_arc(count, ang, radius, delta, tx, ty, angle, turtle_heading, 0);

      /* restore state */

      pen_state = pen_vis;
      pen_vis = -1;
      save_vis();
      setpos_bynumber(tx, ty);
      pen_vis = pen_state;
      save_vis();

      turtle_shown = turtle_state;
      draw_turtle();
      wanna_x = turtle_x;
      wanna_y = turtle_y;
      out_of_bounds = FALSE;
      pen_state = pen_vis;
      pen_vis = -1;
      save_vis();
      forward_helper((FLONUM)0.0);    /* Lets fill work -- dunno why */
      pen_vis = pen_state;
      save_vis();

      done_drawing;
    }
    return(UNBOUND);
}

/************************************************************/
/* The rest of this file implements the recording of moves in
   the graphics window and the playing back of those moves.  It's
   needed on machines like the Macintosh where the contents of the
   graphics window can get erased and need to be redrawn.  On
   machines where no graphics redrawing is necessary, set the size
   of the recording buffer to 1 in logo.h. */

BOOLEAN safe_to_save(void) {
    return(refresh_p && record_index < (GR_SIZE - 300));
}

void save_lm_helper (void) {
    *(int *)(record + record_index + One) = g_round(turtle_x);
    *(int *)(record + record_index + Two) = g_round(turtle_y);
    record_index += Three;
}

void save_line(void) {
    if (safe_to_save()) {
      record[record_index] = LINEXY;
      save_lm_helper();
    }
}

void save_move(void) {
    if (safe_to_save()) {
      if (record_index >= Three && record[record_index - Three] == MOVEXY)
          record_index -= Three;
      record[record_index] = MOVEXY;
      save_lm_helper();
    }
}

void save_vis(void) {
    if (safe_to_save()) {
      record[record_index] = SETPENVIS;
      record[record_index + 1] = (char)pen_vis;
      record_index += One;
    }
}

void save_mode(void) {
    if (safe_to_save()) {
      record[record_index] = SETPENMODE;
#ifdef x_window
      *(GC *)(record + record_index + One) = pen_mode;
#else
      *(int *)(record + record_index + One) = pen_mode;
#endif
      *(int *)(record + record_index + Two) = internal_penmode;
      record_index += Three;
      save_color();
    }
}

void save_color(void) {
    if (safe_to_save()) {
      record[record_index] = SETPENCOLOR;
      *(int *)(record + record_index + One) = pen_color;
      record_index += Two;
    }
}

void save_size(void) {
    if (safe_to_save()) {
      record[record_index] = SETPENSIZE;
      *(int *)(record + record_index + One) = pen_width;
      *(int *)(record + record_index + Two) = pen_height;
      record_index += Three;
    }
}

void save_pattern(void) {
    if (safe_to_save()) {
      record[record_index] = SETPENPATTERN;
      get_pen_pattern(&record[record_index + One]);
      record_index += One+8;
    }
}

void save_string(char *s, int len) {
    int count;

    if (safe_to_save()) {
      record[record_index] = LABEL;
      record[record_index + One] = (unsigned char)len;
      for (count = 0; count <= len; count++)
          record[record_index + One+1 + count] = s[count];
      record[record_index + One+2 + len] = '\0';
      record_index += (One+2 + len + (One-1)) & ~(One-1);
    }
}

void save_arc(FLONUM count, FLONUM ang, FLONUM radius, FLONUM delta,
            FLONUM tx, FLONUM ty, FLONUM angle, FLONUM thead) {
    if (safe_to_save()) {
      record[record_index] = ARC;
      *(FLONUM *)(record + record_index + Big) = count;
      *(FLONUM *)(record + record_index + 2 * Big) = ang;
      *(FLONUM *)(record + record_index + 3 * Big) = radius;
      *(FLONUM *)(record + record_index + 4 * Big) = delta;
      *(FLONUM *)(record + record_index + 5 * Big) = tx;
      *(FLONUM *)(record + record_index + 6 * Big) = ty;
      *(FLONUM *)(record + record_index + 7 * Big) = angle;
      *(FLONUM *)(record + record_index + 8 * Big) = thead;
      record_index += 9*Big;
    }
}

NODE *lrefresh(NODE *args) {
    refresh_p = TRUE;
    return(UNBOUND);
}

NODE *lnorefresh(NODE *args) {
    refresh_p = FALSE;
    return(UNBOUND);
}

void redraw_graphics(void) {
    FLONUM save_tx, save_ty, save_th;
    FIXNUM r_index = 0;
    int lastx, lasty;
    pen_info saved_pen;
    BOOLEAN saved_shown;
#if defined(__RZTC__) && !defined(WIN32)
    BOOLEAN save_splitscreen = in_splitscreen;
#endif
   
    if (!refresh_p) {
    /*      clear_screen;
      draw_turtle();    */
      return;
    }

    save_tx = turtle_x;
    save_ty = turtle_y;
    save_th = turtle_heading;
    saved_shown = turtle_shown;
    turtle_shown = FALSE;
    save_pen(&saved_pen);
    restore_pen(&orig_pen);

#if defined(__RZTC__) && !defined(WIN32)
    full_screen;
#endif

    erase_screen();
    wanna_x = wanna_y = turtle_x = turtle_y = turtle_heading = 0.0;
    out_of_bounds = FALSE;
    move_to(screen_x_coord, screen_y_coord);
    internal_penmode = PENMODE_PAINT;
    pen_down;
    set_pen_color((FIXNUM)7);
    set_pen_width(1);
    set_pen_height(1);

#ifdef __TURBOC__
    moveto(p_info_x(orig_pen),p_info_y(orig_pen));
#endif

    lastx = lasty = 0;

    while (r_index < record_index) {
      turtle_x = (FLONUM)(lastx);
      turtle_y = (FLONUM)(lasty);
      switch (record[r_index]) {
          case (LINEXY) :
            lastx = *(int *)(record + r_index + One);
            lasty = *(int *)(record + r_index + Two);
            line_to(screen_x_center+lastx, screen_y_center-lasty);
            r_index += Three;
            break;
          case (MOVEXY) :
            lastx = *(int *)(record + r_index + One);
            lasty = *(int *)(record + r_index + Two);
            move_to(screen_x_center+lastx, screen_y_center-lasty);
            r_index += Three;
            break;
          case (LABEL) :
            draw_string((unsigned char *)(record + r_index + One+1));
            move_to(screen_x_center+lastx, screen_y_center-lasty);
            r_index += (One+2 + record[r_index + One] + (One-1)) & ~(One-1);
            break;
          case (SETPENVIS) :
            set_pen_vis(record[r_index + 1]);
            r_index += One;
            break;
          case (SETPENMODE) :
#ifdef x_window
            set_pen_mode(*(GC *)(record + r_index + One));
#else
            set_pen_mode(*(int *)(record + r_index + One));
#endif
            internal_penmode = *(int *)(record + r_index + Two);
            r_index += Three;
            break;
          case (SETPENCOLOR) :
            set_pen_color((FIXNUM)(*(int *)(record + r_index + One)));
            r_index += Two;
            break;
          case (SETPENSIZE) :
            set_pen_width(*(int *)(record + r_index + One));
            set_pen_height(*(int *)(record + r_index + Two));
            r_index += Three;
            break;
          case (SETPENPATTERN) :
            set_pen_pattern(&record[r_index + One]);
            r_index += One+8;
            break;
          case (FILLERUP) :
            logofill();
            r_index += One;
            break;
          case (ARC) :
            do_arc(*(FLONUM *)(record + r_index + Big),
                   *(FLONUM *)(record + r_index + 2 * Big),
                   *(FLONUM *)(record + r_index + 3 * Big),
                   *(FLONUM *)(record + r_index + 4 * Big),
                   *(FLONUM *)(record + r_index + 5 * Big),
                   *(FLONUM *)(record + r_index + 6 * Big),
                   *(FLONUM *)(record + r_index + 7 * Big),
                   *(FLONUM *)(record + r_index + 8 * Big),
                   1);
            r_index += 9*Big;
            break;
      }
    }

    restore_pen(&saved_pen);
    turtle_shown = saved_shown;

#if defined(__RZTC__) && !defined(WIN32)
    if (save_splitscreen) {split_screen;}
#endif

    turtle_x = save_tx;
    turtle_y = save_ty;
    turtle_heading = save_th;
    draw_turtle();
}

NODE *lsavepict(NODE *args) {
    FILE *fp;
    static int bg;
      FIXNUM want, cnt;
      char *p;
      
#if defined(WIN32)||defined(ibm)
      extern NODE *lopen(NODE *, char *);
      lopen(args,"wb");
#else
    lopenwrite(args);
#endif
    if (NOT_THROWING) {
      fp = (FILE *)file_list->n_obj;
      save_palette(fp);
      fwrite(&record_index, sizeof(FIXNUM), 1, fp);
      want = record_index;
      p = record;
      while (want > 0) {
            cnt = fwrite(p, 1, want, fp);
            if (ferror(fp) || cnt <= 0) {
                  err_logo(FILE_ERROR,
                        make_static_strnode("File too big"));
                  lclose(args);
                  return UNBOUND;
            }
            want -= cnt;
            p += cnt;
      }
      bg = (int)back_ground;
      fwrite(&bg, sizeof(int), 1, fp);
      lclose(args);
    }
    return UNBOUND;
}

NODE *lloadpict(NODE *args) {
    FILE *fp;
    static int bg;
      FIXNUM want, cnt;
      char *p;

#if defined(WIN32)||defined(ibm)
      extern NODE *lopen(NODE *, char *);
      lopen(args,"rb");
#else
    lopenread(args);
#endif
    if (NOT_THROWING) {
      prepare_to_draw;
      fp = (FILE *)file_list->n_obj;
      restore_palette(fp);
      fread(&record_index, sizeof(FIXNUM), 1, fp);
      if (record_index < 0 || record_index >= GR_SIZE) {
            err_logo(FILE_ERROR,
                         make_static_strnode("File bad format"));
            record_index = 0;
            lclose(args);
            return UNBOUND;
      }
      want = record_index;
      p = record;
      while (want > 0) {
            cnt = fread(p, 1, want, fp);
            if (ferror(fp) || cnt <= 0) {
                  record_index = 0;
                  done_drawing;
                  err_logo(FILE_ERROR,
                               make_static_strnode("File bad format"));
                  lclose(args);
                  return UNBOUND;
            }
            want -= cnt;
            p += cnt;
      }
      fread(&bg, sizeof(int), 1, fp);
      lclose(args);
      set_back_ground((FIXNUM)bg);
      done_drawing;
    }
    return UNBOUND;
}

void ps_string(FILE *fp, char *p) {
    int ch;

    while ((ch = *p++)) {
      if (ch=='(' || ch==')' || ch=='\\') fprintf(fp, "\\");
      fprintf(fp, "%c", ch);
    }
}

void rgbprint(FILE *fp, int cnum) {
    unsigned int r=0, g=0, b=0;

    get_palette(cnum, &r, &g, &b);
    fprintf(fp, "%6.4f %6.4f %6.4f", ((double)r)/65535,
            ((double)g)/65535, ((double)b)/65535);
}

#ifdef mac
extern void fixMacType(NODE *args);
#endif

NODE *lepspict(NODE *args) {
    FILE *fp;
    int r_index = 0, act=0, lastx = 0, lasty = 0, vis = 0;

#ifdef mac
    fixMacType(args);
    lopenappend(args);
#else
    lopenwrite(args);
#endif
    if (NOT_THROWING) {
      fp = (FILE *)file_list->n_obj;

      fprintf(fp, "%%!PS-Adobe-3.0 EPSF-3.0\n");
      ndprintf(fp, "%%Title: %p\n", car(args));
      fprintf(fp, "%%%%Creator: Logo2PS 1.1; Copyright 1997, Vladimir Batagelj\n");
      fprintf(fp, "%%%%BoundingBox: %d %d %d %d\n",
            screen_left, screen_top, screen_right, screen_bottom);
      fprintf(fp, "%%%%EndComments\n");
      ndprintf(fp, "%%Page: %p\n", car(args));
      fprintf(fp, "1 setlinecap 1 setlinejoin\n");
      fprintf(fp, "/Courier 9 selectfont\n");

      fprintf(fp, "gsave\n");
      rgbprint(fp, back_ground);
      fprintf(fp, " setrgbcolor\n");
      fprintf(fp, "%d %d moveto %d %d lineto %d %d lineto %d %d lineto\n",
                screen_left, screen_top, screen_right, screen_top,
                screen_right, screen_bottom, screen_left, screen_bottom);
      fprintf(fp, " closepath fill grestore\n");

      fprintf(fp, "%d %d moveto\n", screen_x_center, screen_y_center);

      while (r_index < record_index)
          switch (record[r_index]) {
            case (LINEXY) :
                if (!vis) {
                  lastx = screen_x_center + *(int *)(record + r_index + One);
                  lasty = screen_y_center + *(int *)(record + r_index + Two);
                  fprintf(fp, "%d %d lineto\n", lastx, lasty);
                  r_index += Three;
                  act++;
                  break;      /* else fall through */
                }
            case (MOVEXY) :
                lastx = screen_x_center + *(int *)(record + r_index + One);
                lasty = screen_y_center + *(int *)(record + r_index + Two);
                fprintf(fp, "%d %d moveto\n", lastx, lasty);
                r_index += Three;
                break;
            case (LABEL) :
                fprintf(fp, "gsave -5 1 rmoveto (");
                ps_string(fp, record + r_index + One+1);
                fprintf(fp, ") show grestore\n");
                fprintf(fp, "%d %d moveto\n", lastx, lasty);
                r_index += (One+2 + record[r_index + One] + (One-1)) & ~(One-1);
                break;
            case (SETPENVIS) :
                vis = record[r_index + 1];
                r_index += One;
                break;
            case (SETPENMODE) :
                r_index += Three;
                break;
            case (SETPENCOLOR) :
                if (act) {
                  fprintf(fp, "stroke %d %d moveto\n", lastx, lasty);
                  act = 0;
                }
                rgbprint(fp, (*(int *)(record + r_index + One)));
                fprintf(fp, " setrgbcolor\n");
                r_index += Two;
                break;
            case (SETPENSIZE) :
                if (act) {
                  fprintf(fp, "stroke %d %d moveto\n", lastx, lasty);
                  act = 0;
                }
                fprintf(fp, "%d setlinewidth\n",
                      (*(int *)(record + r_index + One)));
                r_index += Three;
                break;
            case (SETPENPATTERN) :
                r_index += One+8;
                break;
            case (FILLERUP) :
                r_index += One;
                break;
            case (ARC) :
                r_index += 9*Big;
                break;
          }
          
      fprintf(fp, "stroke\nshowpage\n%%%%EOF\n");

      lclose(args);
    }
    return UNBOUND;
}

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