/*
 *              Glimit  Window limits in world coordinates (WC)
 */

typedef struct {
        double xmin;         /*  x min. limit     */
        double xmax;         /*  x max. limit     */
        double ymin;         /*  y min. limit     */
        double ymax;         /*  y max. limit     */
               } Glimit;

/*
 *              Gilimit   Viewport limits in device coordinates (DC)
 */

typedef struct {
        int xmin;            /*  x min. limit     */
        int xmax;            /*  x max. limit     */
        int ymin;            /*  y min. limit     */
        int ymax;            /*  y max. limit     */
               } Gilimit;

/*
 *              Gtran   Window -> Viewport transformation  
 */

typedef struct {
        Glimit  w;            /*    window          */
        Gilimit v;            /*    viewport        */
               } Gtran;

/*
 *               Gpoint   A point in WC
 */

typedef struct {
        double x,y;
               } Gpoint;

/*
 *               Gipoint  A point in DC
 */

typedef struct {
        int x,y;
               } Gipoint;

/*
 *               Gmap   Transformation matrix.
 */

typedef struct {
        double xm,ym,xa,ya;
               } Gmap;


/*
 *              Gflinter. Fill interior style.
 */

typedef enum   {
        HOLLOW,
        SOLID,
        PATTERN,
        HATCH
               } Gflinter;


/*
 *      Define the users function return values.
 */

extern int setwindow(),setviewport(),selntran();
extern int setlinetype(),setlinecolour();
extern int setfillintstyle(),setfillcolour(),setfillindex();
extern int openws(),closews(),polyline(),gdp51(),gdp52(),gdp53();
extern int pause();


/*
 *       Graphics state list.
 */

#include "gks.h"
#define NUMTRAN 12
#define NUMWS   4

typedef struct {
        int scr_width;          /* Screen width in pixels.          */
        int scr_height;         /* Screen height in pixels.         */
        Gtran ntran[NUMTRAN];   /* Vector of transformations.       */
        Gtran curntr;           /* Current transformation.          */
        Gmap  curmap;           /* Current transformation matrix.   */
        int ltype;              /* Current linetype.                */
        int lci;                /* Current line colour index.       */
        Gflinter fstyle;        /* Current fill style.              */
        int fstyle_index;       /* Fill style index.                */
        int fci;                /* Fill colour index.               */
                } Gstate;

Gstate wsdt[NUMWS];


Gstate *wsd;            /* Current workstation state table. */