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#ifndef LAYOUT_H

#define LAYOUT_H 1

#ifdef __cplusplus

extern "C" {

#endif

/*

Unlike the original code, we assume that the set of nodes

known to this layout graph is always kept 1-1 with the set

of dual nodes.  Similarly with respect to edges.

This implies that every time a dual is created/deleted,

that the corresponding create/delete methods must be

called in the layout graph class.

Additionally, we assume the existence of two ``update''

methods that propagate the correct location and size info

between the layout graph nodes and their duals.

*/

struct Layout_Graph; /* hidden */

/* ptr to user's node info */

typedef void* pItem;

/*

As inputs, we need the following:

For nodes: bbox that just surrounds the node.

For edges: width and height of the text (if any)

           associated with the edge.

As outputs, we provide the following:

For nodes: new absolute position of the northwest corner

           of the bbox for the node.

For edges: (x,y) coordinates of the endpoints of the edge.

To avoid proliferation of types,

we define a single struct (ItemGeom)

that is used to carry all the input and output info.

Item type       Direction       ItemGeom Fields Used

---------       ---------       --------------------

Node            In              x1,y1,x2,y2

                Out             x1,y1

Edge            In              width,height

                Out             x1,y1,x2,y2

*/

/* All values are in pixels */

struct ItemGeom {

        double  x1,y1;

        double  x2,y2;

        double  width,height;

};

typedef struct ItemGeom ItemGeom;

struct LayoutConfig {

        pItem                   rootnode;

        int                     graphorder;

        int                     nodespaceH;

        int                     nodespaceV;

        int                     xoffset;

        int                     yoffset;

        int                     computenodesize;

        int                     elementsperline;

        int                     hideedges;

        int                     keeprandompositions;

        int                     maxx;

        int                     maxy;

        int                     gridlock;

};

typedef struct LayoutConfig LayoutConfig;

extern LayoutConfig GetLayoutConfig _ANSI_ARGS_((struct Layout_Graph*));

extern void SetLayoutConfig _ANSI_ARGS_((struct Layout_Graph*, LayoutConfig));

extern  int LayoutISI _ANSI_ARGS_((struct Layout_Graph*));

extern  int LayoutTree _ANSI_ARGS_((struct Layout_Graph*));

extern  int LayoutMatrix _ANSI_ARGS_((struct Layout_Graph*));

extern  int LayoutRandom _ANSI_ARGS_((struct Layout_Graph*));

#if DEBUGGING

extern  void LayoutDebugging _ANSI_ARGS_((struct Layout_Graph*, struct Node *currentnode, char *string, int type));

#endif

extern struct Layout_Graph* LayoutCreateGraph _ANSI_ARGS_(());

extern void LayoutFreeGraph _ANSI_ARGS_((struct Layout_Graph*));

extern void LayoutClearGraph _ANSI_ARGS_((struct Layout_Graph*));

extern int LayoutCreateNode _ANSI_ARGS_((struct Layout_Graph*,

                                          pItem nodeid,

                                          pItem from, pItem to));

extern int LayoutDeleteNode _ANSI_ARGS_((struct Layout_Graph*, pItem nodeid));

extern int LayoutCreateEdge _ANSI_ARGS_((struct Layout_Graph*,

                                         pItem edgeid,

                                         pItem from, pItem to));

extern int LayoutDeleteEdge _ANSI_ARGS_((struct Layout_Graph*, pItem edgeid));

extern int LayoutGetIthNode _ANSI_ARGS_((struct Layout_Graph*, long, pItem*));

extern int LayoutGetIthEdge _ANSI_ARGS_((struct Layout_Graph*, long,  pItem*));

extern int LayoutGetNodeBBox _ANSI_ARGS_((struct Layout_Graph*, pItem, ItemGeom*));

extern int LayoutSetNodeBBox _ANSI_ARGS_((struct Layout_Graph*, pItem, ItemGeom));

extern int LayoutGetEdgeEndPoints _ANSI_ARGS_((struct Layout_Graph*, pItem, ItemGeom*));

extern int LayoutSetEdgeDim _ANSI_ARGS_((struct Layout_Graph*, pItem, ItemGeom));

extern char* LayoutGetError _ANSI_ARGS_((struct Layout_Graph*));

#ifdef __cplusplus

}

#endif

#endif /*LAYOUT_H*/