Geografic-Information-System/include/symbol.h

#ifndef GRASS_SYMB_H
#define GRASS_SYMB_H

/* definitions and structures */

/* Warning : structure is not exactly the same as format. */

#define S_NONE    0 /* no object (used for reading) */

/* elements */
#define S_LINE    1 /* line */
#define S_ARC     2 /* arc */

/* parts */
#define S_STRING  1 
#define S_POLYGON 2 

#define S_COL_DEFAULT 1 /* default color */
#define S_COL_NONE    2 /* no color */
#define S_COL_DEFINED 3 /* color defined in symbol file */

typedef struct {
    int color;  /* reset default */
    int r, g, b;
    double fr, fg, fb; 
} SYMBCOLOR;

/* symbol element: line or arc */
typedef struct { 
    int type;  /* S_LINE or S_ARC */
    union {
	struct {
            int count, alloc;
	    double *x, *y; 
	} line;
	struct {
	    int clock; /* 1 clockwise, 0 counter clockwise */
	    double x, y, r, a1, a2; 
	} arc;
    } coor;
} SYMBEL;
 
/* string of elements */
typedef struct {
    int count, alloc; /* number of elements */
    SYMBEL **elem; /* array of elements */
    int    scount, salloc;  /* number of points in stroked version */
    int    *sx, *sy;  /* coordinates in stroked version */
} SYMBCHAIN;

/* part */
typedef struct {
    int type; /* S_STRING or S_POLYGON */
    SYMBCOLOR color;
    SYMBCOLOR fcolor;
    int count, alloc; /* number of rings */
    SYMBCHAIN **chain; /* array strings */
} SYMBPART;

typedef struct {
    double scale; /* to get symbol of size 1, each vertex must be multiplied by this scale */
    int count, alloc;/* numer of parts */
    SYMBPART **part; /* objects ( parts ) */
} SYMBOL;

/* prototypes */
SYMBOL *S_read ( char *sname );
void S_stroke ( SYMBOL *symb, int size, double rotation, int tolerance );

#endif