4.4BSD/usr/src/contrib/groff-1.08/pic/object.h

// -*- C++ -*-
/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
     Written by James Clark (jjc@jclark.com)

This file is part of groff.

groff 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, or (at your option) any later
version.

groff 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 groff; see the file COPYING.  If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

struct place;

enum object_type {
  OTHER_OBJECT,
  BOX_OBJECT,
  CIRCLE_OBJECT,
  ELLIPSE_OBJECT,
  ARC_OBJECT,
  SPLINE_OBJECT,
  LINE_OBJECT,
  ARROW_OBJECT,
  MOVE_OBJECT,
  TEXT_OBJECT,
  BLOCK_OBJECT,
  MARK_OBJECT
  };

struct bounding_box;

struct object {
  object *prev;
  object *next;
  object();
  virtual ~object();
  virtual position origin();
  virtual double width();
  virtual double radius();
  virtual double height();
  virtual position north();
  virtual position south();
  virtual position east();
  virtual position west();
  virtual position north_east();
  virtual position north_west();
  virtual position south_east();
  virtual position south_west();
  virtual position start();
  virtual position end();
  virtual position center();
  virtual place *find_label(const char *);
  virtual void move_by(const position &);
  virtual int blank();
  virtual void update_bounding_box(bounding_box *);
  virtual object_type type() = 0;
  virtual void print();
  virtual void print_text();
};

typedef position (object::*corner)();

struct place {
  object *obj;
  double x, y;
};

struct string_list;

class path {
  corner crn;
  string_list *label_list;
public:
  path(corner = 0);
  path(char *, corner = 0);
  ~path();
  void append(corner);
  void append(char *);
  int follow(const place &, place *) const;
};

struct object_list {
  object *head;
  object *tail;
  object_list();
  void append(object *);
  void wrap_up_block(object_list *);
};

declare_ptable(place)

// these go counterclockwise
enum direction {
  RIGHT_DIRECTION,
  UP_DIRECTION,
  LEFT_DIRECTION,
  DOWN_DIRECTION
  };

struct graphics_state {
  double x, y;
  direction dir;
};

struct saved_state : graphics_state {
  saved_state *prev;
  PTABLE(place) *tbl;
};


struct text_item {
  text_item *next;
  char *text;
  adjustment adj;
  const char *filename;
  int lineno;

  text_item(char *, const char *, int);
  ~text_item();
};

const unsigned long IS_DOTTED = 01;
const unsigned long IS_DASHED = 02;
const unsigned long IS_CLOCKWISE = 04;
const unsigned long IS_INVISIBLE = 020;
const unsigned long HAS_LEFT_ARROW_HEAD = 040;
const unsigned long HAS_RIGHT_ARROW_HEAD = 0100;
const unsigned long HAS_SEGMENT = 0200;
const unsigned long IS_SAME = 0400;
const unsigned long HAS_FROM = 01000;
const unsigned long HAS_AT = 02000;
const unsigned long HAS_WITH = 04000;
const unsigned long HAS_HEIGHT = 010000;
const unsigned long HAS_WIDTH = 020000;
const unsigned long HAS_RADIUS = 040000;
const unsigned long HAS_TO = 0100000;
const unsigned long IS_CHOPPED = 0200000;
const unsigned long IS_DEFAULT_CHOPPED = 0400000;
const unsigned long HAS_THICKNESS = 01000000;
const unsigned long IS_FILLED = 02000000;
const unsigned long IS_DEFAULT_FILLED = 04000000;
const unsigned long IS_ALIGNED = 010000000;

struct segment {
  int is_absolute;
  position pos;
  segment *next;
  segment(const position &, int, segment *);
};

struct rectangle_object;
struct graphic_object;
struct linear_object;

struct object_spec {
  unsigned long flags;
  object_type type;
  object_list oblist;
  PTABLE(place) *tbl;
  double dash_width;
  position from;
  position to;
  position at;
  position by;
  path *with;
  text_item *text;
  double height;
  double radius;
  double width;
  double segment_width;
  double segment_height;
  double start_chop;
  double end_chop;
  double thickness;
  double fill;
  direction dir;
  segment *segment_list;
  position segment_pos;
  int segment_is_absolute;

  object_spec(object_type);
  ~object_spec();
  object *make_object(position *, direction *);
  graphic_object *make_box(position *, direction *);
  graphic_object *make_block(position *, direction *);
  graphic_object *make_text(position *, direction *);
  graphic_object *make_ellipse(position *, direction *);
  graphic_object *make_circle(position *, direction *);
  linear_object *make_line(position *, direction *);
  linear_object *make_arc(position *, direction *);
  graphic_object *make_linear(position *, direction *);
  graphic_object *make_move(position *, direction *);
  int position_rectangle(rectangle_object *p, position *curpos,
			 direction *dirp);
};


object *make_object(object_spec *, position *, direction *);

object *make_mark_object();
object *make_command_object(char *, const char *, int);

int lookup_variable(const char *name, double *val);
void define_variable(const char *name, double val);

void print_picture(object *);