/* $Id: block.h,v 1.4 2004/12/11 19:26:05 ellson Exp $ $Revision: 1.4 $ */
/* vim:set shiftwidth=4 ts=8: */

/**********************************************************
*      This software is part of the graphviz package      *
*                http://www.graphviz.org/                 *
*                                                         *
*            Copyright (c) 1994-2004 AT&T Corp.           *
*                and is licensed under the                *
*            Common Public License, Version 1.0           *
*                      by AT&T Corp.                      *
*                                                         *
*        Information and Software Systems Research        *
*              AT&T Research, Florham Park NJ             *
**********************************************************/

#ifdef __cplusplus
extern "C" {
#endif

#ifndef BLOCK_H
#define BLOCK_H

#include  <nodelist.h>

    typedef struct block block_t;

    typedef struct {
	block_t *first;
	block_t *last;
    } blocklist_t;

    struct block {
	Agnode_t *child;	/* if non-null, points to node in parent block */
	block_t *next;		/* sibling block */
	Agraph_t *sub_graph;	/* nodes and edges in this block */
	double radius;		/* radius of block and subblocks */
	double rad0;		/* radius of block */
	nodelist_t *circle_list;	/* ordered list of nodes in block */
	blocklist_t children;	/* child blocks */
	double parent_pos;	/* if block has 1 node, angle to place parent */
	int flags;
    };

    extern block_t *mkBlock(Agraph_t *);
    extern void freeBlock(block_t * sp);

    extern void initBlocklist(blocklist_t *);
    extern void appendBlock(blocklist_t * sp, block_t * sn);
    extern void insertBlock(blocklist_t * sp, block_t * sn);
/* extern void freeBlocklist (blocklist_t* sp); */

#ifdef DEBUG
    extern void printBlocklist(blocklist_t * snl);
#endif

#define CHILD(b) ((b)->child)
#define BLK_PARENT(b) (CHILD(b)? PARENT(CHILD(b)) : 0)
#define BLK_FLAGS(b) ((b)->flags)

#define COALESCED_F   (1 << 0)
#define COALESCED(b) (BLK_FLAGS(b)&COALESCED_F)
#define SET_COALESCED(b) (BLK_FLAGS(b) |= COALESCED_F)

#endif

#ifdef __cplusplus
}
#endif
