#ifndef GIMMELIB_GRAPH_H
#define GIMMELIB_GRAPH_H

#include "gimmelib/postext.h"


typedef struct _gim_nax {
    SHORT origin, size;     /* offset of origin and axis size in pixels */
    SHORT low;		    /* coord corresponding to origin */
    SHORT amt;		    /* modified by newgraph flags */
    SHORT initpt;	    /* coord of initial point (see newgraph flags) */
    SHORT step; 	    /* step size for even labelling, 0 for fancy */
    SHORT labnum, labdenom; /* fraction for label scaling */
} NEWAXIS;

typedef struct _gim_axis {
    SHORT origin, size;     /* offset of origin and axis size in pixels */
    SHORT low;		    /* coord corresponding to origin */
    SHORT high; 	    /* coord corresponding to high end of axis */
    SHORT scale;	    /* scale of axis: -ve means coords per pixel */
    SHORT usesize;	    /* actual size of axis used in pixels */
    SHORT lastdata;	    /* last coord added to graph */
    SHORT lastoff;	    /* offset of last coord in pixels */
    SHORT step; 	    /* step size for even labelling, 0 for fancy */
    SHORT labnum, labdenom; /* fraction for label scaling */
    SHORT flow, fhigh;	    /* first low and high - for graph reinit */
    SHORT fdata, foff;	    /* first coord and offset - for graph reinit */
} AXIS;

typedef struct _gim_newgr {
    UBYTE   *title, *xtitle, *ytitle;	    /* graph and axes titles */
    struct TextAttr *titleta, *xta, *yta;   /* text attributes for titles */
    BYTE    FPen, BPen, AxesPen, TitlePen;  /* colours for primary parts */
    ULONG   flags, ctlflags;		    /* all-important flags */
    NEWAXIS X, Y;			    /* actual new-axis structs */
    struct RastPort *rp;		    /* RastPort to be copied, or NULL */
} NEWGRAPH;


/* flags for NEWGRAPH.flags (and GRAPH.flags) */
#define GGR_DELTAX	    (1L << 0)
#define GGR_LINETOX	    (1L << 1)
#define GGR_FILLTOX	    (1L << 2)
#define GGR_BLACKTOX	    (1L << 3)
#define GGR_X_MAX	    (1L << 8)   /* default */
#define GGR_X_INTERVALS     (1L << 9)
#define GGR_X_SPACING	    (1L << 10)  /* auto-spacing based on size */
#define GGR_X_INTEGRAL	    (1L << 11)
#define GGR_X_FLAGS	    0x0000FFFFL

#define GGR_DELTAY	    (1L << 16)
#define GGR_LINETOY	    (1L << 17)
#define GGR_FILLTOY	    (1L << 18)
#define GGR_BLACKTOY	    (1L << 19)
#define GGR_Y_MAX	    (1L << 24)  /* default */
#define GGR_Y_INTERVALS     (1L << 25)
#define GGR_Y_SPACING	    (1L << 26)
#define GGR_Y_INTEGRAL	    (1L << 27)
#define GGR_Y_FLAGS	    0xFFFF0000L

#define GGR_DEFAULT	    0L

/* control flags for NEWGRAPH.ctlflags (and GRAPH.ctlflags) */
#define GGR_INITORIGIN	    (1L << 0)
#define GGR_INITPOINT	    (1L << 1)
#define GGR_NOCLEARSTART    (1L << 8)
#define GGR_NOCONNECTLINE   (1L << 9)
#define GGR_NOLABELS	    (1L << 10)
#define GGR_CLEARONEND	    (1L << 15)
#define GGR_HIRES	    (1L << 24)
#define GGR_INTERLACE	    (1L << 25)

#define GGR_CTL_DEFAULT     0L

/* explanation of drawing flags:
 * DELTA:	coord of new point is relative to coord of previous point
 * LINETO:	draw a line from the point to the respective axis
 * FILLTO:	area fill the trapezoid from previous point to resp. axis
 * BLACKTO:	like LINETO but using background colour (useful with FILLTO)

/* explanation of newaxis-specific flags:
 * MAX: 	newaxis.amt specifies max coord on initial graph
 * INTERVALS:	newaxis.amt specifies difference between low and high coords
 * SPACING:	newaxis.amt specifies the scale to be applied (+ve or -ve)
 * INTEGRAL:	force integer number of pixels/coord or coords/pixel

/* explanation of control flags:
 * INITORIGIN:	    use origin as initial point
 * INITPOINT:	    use point specified in nexaxes as initial point
 *			(otherwise newaxis.initpt is ignored)
 * NOCLEARSTART:    don't clear the rastport when initializing graph
 *			(useful if several graphs on same "rastport")
 * NOLABELS:	    don't draw titles, axes and labels for me ever (I'll do it)
 * NOCONNECTLINE:   don't connect points in graph by a line
 * CLEARONEND:	    clear the graph when doing getRidOfGraph
 * HIRES:	    graph to be displayed on HIRES screen
 * INTERLACE:	    graph to be displayed on INTERLACE screen
 *			(these two are useful for determining aspect ratios)


typedef struct _gim_graph {
    struct RastPort rp; 		/* actual RastPort struct */
    ULONG   flags;			/* flags, as in newgraph */
    ULONG   ctlflags;			/* control flags, as in newgraph */
    UBYTE   *title, *xtitle, *ytitle;	/* graph and axes titles */
    struct TextFont *titletf, *xtf, *ytf;   /* fonts for titles */
    struct TextFont *xlabtf, *ylabtf;	    /* fonts for axes' labels */
    BYTE    FPen, BPen, AxesPen, TitlePen;  /* colours for primary parts */
    BYTE    XlabPen, YlabPen, XtitlePen, YtitlePen;   /* secondary colours */
    SHORT   points;			/* number of points added so far */
    AXIS    X, Y;			/* actual axis structs */
    void    *memhead;			/* memory-chain for this graph */
    struct _gim_graph *next;		 /* link to next graph (future use) */
} GRAPH;


/* INTERNAL scaling factor used by graph routines for intermediate results */
#define SCALE	    6


/* flags for graphWriteLabel() */
#define GWL_XAXIS	(1L << 20)      /* label the x-axis (don't set yaxis) */
#define GWL_YAXIS	(1L << 21)      /* label the y-axis (don't set xaxis) */
#define GWL_CLEAR_ONLY	(1L << 22)      /* clear the previous labels only! */
#define GWL_CLEAR_OLD	(1L << 23)      /* clear previous then draw labels */
#define GWL_RESERVED	(0x000fffffL)   /* reserved for internal use only!! */
#define GWL_DEFAULT	(AWL_YAXIS)


#endif !GIMMELIB_GRAPH_H