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/*
Copyright (C) 2017-2020, Dirk Krause
SPDX-License-Identifier: BSD-3-Clause
*/

/*
	WARNING: This file was generated by the dkct program (see
	http://dktools.sourceforge.net/ for details).
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk4gra.ctr
*/

#ifndef DK4GRA_H_INCLUDED
/** Avoid multiple inclusions. */
#define DK4GRA_H_INCLUDED 1


#line 9 "dk4gra.ctr"

/**	@file dk4gra.h	Graphics output (PS/EPS/PDF/PGF).

This module contains functions to create PS/EPS/PDF/PGF graphics.

Coordinates are specified in PS points, called bp in LaTeX.
72 PS points are one inch.

The origin is in the lower left corner, x values grow to the right,
y values grow to top.

Colors specified as double values are in the range from 0.0 to 1.0.

For each object to draw follow an algorithm like

@code
dk4_bb_t	bb;

dk4gra_set_line_width(...);
dk4gra_set_line_style(...);
dk4gra_set_line_cap(...);
dk4gra_set_line_join(...);
dk4gra_set_stroke_...(...);
dk4gra_set_fill_...(...);

if (want_a_pattern_filled_object) {
	dk4bb_init(&bb);
	dk4gra_prepare_fill(...);
	construct_path(...);
	dk4gra_fill(...);
	dk4gra_set_gs_for_pattern_only(gra, 1, ...);
	dk4gra_gsave(...);
	construct_path(..., &bb, ...);
	dk4gra_clip(...);
	dk4gra_pattern(..., bb.xmin, bb.xmax, bb.ymin, bb.ymax, ...);
	dk4gra_grestore(...);
	dk4gra_set_gs_for_pattern_only(gra, 0, ...);
	if (want_a_stroked_object) {
		dk4gra_prepare_stroke(...);
		construct_path(...);
		dk4gra_stroke(...);
	}
}
else {
	if (want_a_filled_object) {
		if (want_a_stroked_object) {
			if (0 != dk4gra_can_fill_and_stroke(...)) {
				dk4gra_prepare_fill_and_stroke(...);
				construct_path(...);
				dk4gra_fill_and_stroke(...);
			}
			else {
				dk4gra_prepare_fill(...);
				construct_path(...);
				dk4gra_fill(...);
				dk4gra_prepare_stroke(...);
				construct_path(...);
				dk4gra_stroke(...);
			}
		}
		else {
			dk4gra_prepare_fill(...);
			construct_path(...);
			dk4gra_fill(...);
		}
	}
	else {
		if (want_a_stroked_object) {
			dk4gra_prepare_stroke(...);
			construct_path(...);
			dk4gra_stroke(...);
		}
	}
}
@endcode

The dk4gra_set_fill_...() and dk4gra_set_stroke_...() functions set color
space and color values. You must use the same color space for both
fill and stroke color.
*/



#ifndef	DK4CONF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4conf.h"
#else
#include <dktools-4/dk4conf.h>
#endif
#endif

#ifndef	DK4MEM_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4mem.h"
#else
#include <dktools-4/dk4mem.h>
#endif
#endif

#ifndef	DK4FONT_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4font.h"
#else
#include <dktools-4/dk4font.h>
#endif
#endif

#ifndef	DK4ALIGN_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4align.h"
#else
#include <dktools-4/dk4align.h>
#endif
#endif

#ifndef	DK4ERROR_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4error.h"
#else
#include <dktools-4/dk4error.h>
#endif
#endif

#ifndef	DK4BB_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4bb.h"
#else
#include <dktools-4/dk4bb.h>
#endif
#endif

#ifndef	DK4BIFTY_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4bifty.h"
#else
#include <dktools-4/dk4bifty.h>
#endif
#endif

#ifndef	DK4CS_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4cs.h"
#else
#include <dktools-4/dk4cs.h>
#endif
#endif

#ifndef	DK4MEMBF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4membuf.h"
#else
#include <dktools-4/dk4membuf.h>
#endif
#endif

#ifndef	DK4MBSTRM_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4mbstrm.h"
#else
#include <dktools-4/dk4mbstrm.h>
#endif
#endif

#ifndef	DK4FONTC_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4fontc.h"
#else
#include <dktools-4/dk4fontc.h>
#endif
#endif

#ifndef	DK4UC2L_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4uc2l.h"
#else
#include <dktools-4/dk4uc2l.h>
#endif
#endif



/**	Epsilon value for coordinates.
	All values smaller than this are treated as 0.0.
*/
#define	DK4_GRA_EPSILON_COORDINATES		1.0e-5

/**	Epsilon value for line widths.
	Line width differing less are treated as equal.
*/
#define	DK4_GRA_EPSILON_LINEWIDTH		1.0e-3

/**	Epsilon value for miter limits.
	Miter limits differing less are treated as equal.
*/
#define	DK4_GRA_EPSILON_MITERLIMIT		1.0e-3


/**	Flags for adding images to a page.
*/
enum {
							/**	The image is the only page contents.
								For PS output the gsave operator, clipping
								and white filling at start of page are
								removed, the grestore at end of page too.
							*/
	DK4_GRA_IMG_FLAG_ONLY_PAGE_CONTENTS		= 0x0001 ,

							/**	Fill image background with color from background
								chunk before applying image data.
								Only in effect when producing PDF output in
								DK4_CS_RGB_ALPHA or DK4_CS_GRAY_ALPHA
								color space.
							*/
	DK4_GRA_IMG_FLAG_FILL_BACKGROUND		= 0x0002 ,

							/**	Allow colored output.
								Otherwise grayscaled output is enforced.
							*/
	DK4_GRA_IMG_FLAG_COLOR					= 0x0004 ,

							/**	Allow LZW compression in PS language
								level 2 output.
							*/
	DK4_GRA_IMG_FLAG_LZW					= 0x0008 ,

							/**	Allow to use DCT encoded data from JPEG
								files directly.
							*/
	DK4_GRA_IMG_FLAG_DCT					= 0x0010 ,

							/**	Set image interpolation flag to allow
								PS/PDF renderers to optimize representation.
							*/
	DK4_GRA_IMG_FLAG_INTERPOLATION			= 0x0020 ,

							/**	Set image interpolation flag when directly
								using DCT encoded data from JPEG files.
							*/
	DK4_GRA_IMG_FLAG_DCT_INTERPOLATION		= 0x0040 ,

							/**	Analyze number of bits per component, reduce
								if possible without quality loss.
							*/
	DK4_GRA_IMG_FLAG_ANALYZE_BPC			= 0x0080 ,

							/**	Analyze use of colors, switch to grayscale
								if possible without quality loss.
							*/
	DK4_GRA_IMG_FLAG_ANALYZE_COLOR			= 0x0100 ,

							/**	Analyze use of alpha channel data, ignore
								alpha data if all pixels have full opacity.
							*/
	DK4_GRA_IMG_FLAG_ANALYZE_ALPHA			= 0x0200 ,

							/**	Allow to rotate the image to fit paper size.
							*/
	DK4_GRA_IMG_FLAG_ALLOW_ROTATION			= 0x0400 ,

							/**	Ignore image resolution saved in file.
							*/
	DK4_GRA_IMG_FLAG_IGNORE_RESOLUTION		= 0x0800 ,

							/**	Ignore aspect ratio, allow distorsion while
								filling the specified image range completely.
							*/
	DK4_GRA_IMG_FLAG_IGNORE_ASPECT_RATIO	= 0x1000 ,
};



/**	Text flags for use with
	dk4gra_pgf_simple_text(),
	dk4gra_pgf_special_text(),
	dk4gra_app_pgf_simple_text(),
	dk4gra_app_pgf_special_text(),
	dk4pppt_simple_text(),
	and dk4pppt_special_text(), can be or-combined.
*/
enum {
									/**	Draw oval box around text.
									*/
	DK4_GRA_TEXT_FLAG_OVAL_BOX		=	0x0001 ,

									/**	Put white box around text and oval box.
									*/
	DK4_GRA_TEXT_FLAG_WHITE_BOX		=	0x0002
};



/**	Output driver to choose.
*/
typedef enum {
	DK4_GRA_DRIVER_PDF		= 0,	/**< Produce PDF file. */
	DK4_GRA_DRIVER_EPS ,			/**< Produce EPS file. */
	DK4_GRA_DRIVER_PS ,				/**< Produce PS file. */
	DK4_GRA_DRIVER_PGF ,			/**< Produce PGF file. */
	DK4_GRA_DRIVER_BB				/**< Produce bounding box file. */
} dk4_gra_driver_t;



/**	Intended purpose for output.
*/
typedef enum {
	DK4_GRA_PURPOSE_OBJECT	= 0 ,	/**< Object to include in a document. */
	DK4_GRA_PURPOSE_IMAGE ,			/**< Standalone image. */
	DK4_GRA_PURPOSE_DOCUMENT		/**< Document for viewing or printing. */
} dk4_gra_purpose_t;



/**	Line styles.
*/
typedef enum {
	DK4_GRA_LS_SOLID		= 0 ,	/**< Solid line. */
	DK4_GRA_LS_DASH ,				/**< Dashed line. */
	DK4_GRA_LS_DOT ,				/**< Dotted line. */
	DK4_GRA_LS_DASH_DOT ,			/**< Dash dot line. */
	DK4_GRA_LS_DASH_DOT_DOT ,		/**< Dash dot dot line. */
	DK4_GRA_LS_DASH_DOT_DOT_DOT		/**< Dash dot dot dot line. */
} dk4_gra_ls_t;


/**	Line cap styles.
*/
typedef enum {
	DK4_GRA_LC_BUTTED	= 0,	/**< Line finished exactly at point. */
	DK4_GRA_LC_ROUNDED ,		/**< Half circle added at each line end. */
	DK4_GRA_LC_PROJECTING		/**< Half square added at each line end. */
} dk4_gra_lc_t;


/**	Line join styles.
*/
typedef enum {
	DK4_GRA_LJ_MITERED	= 0,	/**< Pointed. */
	DK4_GRA_LJ_ROUNDED ,		/**< Rounded. */
	DK4_GRA_LJ_BEVELED			/**< Cutted point. */
} dk4_gra_lj_t;


/**	Flags for new pages. Or-combinations allowed.
*/
enum {
								/**	Do not set clip path.
								*/
	DK4_GRA_PAGE_FLAG_NO_CLIP	= 0x0001 ,

								/**	Do not fill background in white.
								*/
	DK4_GRA_PAGE_FLAG_NO_BG		= 0x0002 ,

								/**	Use uncompressed PDF page stream.
									Intended for debugging purposes only.
								*/
	DK4_GRA_PAGE_FLAG_NOT_COMPRESSED	= 0x0004 ,

								/**	Use front side and back side of paper.
								*/
	DK4_GRA_DOC_FLAG_DUPLEX				= 0x0200 ,

								/**	Use front side and back side of paper,
									binding like a calendar.
								*/
	DK4_GRA_DOC_FLAG_TUMBLE				= 0x0400 ,

								/**	Force use of grayscaled output
									instead of colors.
								*/
	DK4_GRA_DOC_FLAG_FORCE_GRAY			= 0x0800 ,

								/**	Use PS level 2 instead of level 3.
								*/
	DK4_GRA_DOC_FLAG_PS2				= 0x1000 ,

								/**	Produce document structuring comments.
								*/
	DK4_GRA_DOC_FLAG_PS_DSC				= 0x2000 ,

								/**	Produce EPS instead of normal PS.
								*/
	DK4_GRA_DOC_FLAG_EPS				= 0x4000 
};



/**	Fill patterns.
*/
typedef enum {
	/**	Diagonal lines 30 degrees to the left.
	*/
	DK4_GRA_PATTERN_30_DEGREE_LEFT	= 0,

	/**	Diagonal lines 30 degrees to the right.
	*/
	DK4_GRA_PATTERN_30_DEGREE_RIGHT ,

	/**	Crosshatch of lines 30 degrees to the left and right.
	*/
	DK4_GRA_PATTERN_30_DEGREE_SIEVE ,

	/**	Diagonal lines 45 degrees to the left.
	*/
	DK4_GRA_PATTERN_45_DEGREE_LEFT ,

	/**	Diagonal lines 45 degrees to the left.
	*/
	DK4_GRA_PATTERN_45_DEGREE_RIGHT ,

	/**	Crosshatch of lines 45 degrees to the left and right.
	*/
	DK4_GRA_PATTERN_45_DEGREE_SIEVE ,

	/**	Horizontal bricks.
	*/
	DK4_GRA_PATTERN_HORIZONTAL_BRICKS ,

	/**	Vertical bricks.
	*/
	DK4_GRA_PATTERN_VERTICAL_BRICKS ,

	/**	Horizontal lines.
	*/
	DK4_GRA_PATTERN_HORIZONTAL_LINES ,

	/**	Vertical lines.
	*/
	DK4_GRA_PATTERN_VERTICAL_LINES ,

	/**	Crosshatch of horizontal and vertical lines.
	*/
	DK4_GRA_PATTERN_HORIZONTAL_VERTICAL_SIEVE ,

	/**	Horizontal shingles skewed to the left.
	*/
	DK4_GRA_PATTERN_HORIZONTAL_SHINGLES_LEFT ,

	/**	Horizontal shingles skewed to the right.
	*/
	DK4_GRA_PATTERN_HORIZONTAL_SHINGLES_RIGHT ,

	/**	Vertical shingles skewed to one side.
	*/
	DK4_GRA_PATTERN_VERTICAL_SHINGLES_1 ,

	/**	Vertical shingles skewed to the other side.
	*/
	DK4_GRA_PATTERN_VERTICAL_SHINGLES_2 ,

	/**	Large fish scales.
	*/
	DK4_GRA_PATTERN_LARGE_FISH_SCALES ,

	/**	Small fish scales.
	*/
	DK4_GRA_PATTERN_SMALL_FISH_SCALES ,

	/**	Circles.
	*/
	DK4_GRA_PATTERN_CIRCLES ,

	/**	Hexagons.
	*/
	DK4_GRA_PATTERN_HEXAGONS ,

	/**	Octagons.
	*/
	DK4_GRA_PATTERN_OCTAGONS ,

	/**	Horizontal tire treads.
	*/
	DK4_GRA_PATTERN_HORIZONTAL_TIRES ,

	/**	Vertical tire treads.
	*/
	DK4_GRA_PATTERN_VERTICAL_TIRES

} dk4_gra_pattern_t;



/**	Maximum pattern number.
*/
enum {
	/**	Maximum pattern number.
	*/
	DK4_GRA_PATTERN_MAX = DK4_GRA_PATTERN_VERTICAL_TIRES
};



/**	Type of preamble line to add.
*/
enum {
	DK4_GRA_PREAMBLE_FONT	= 0 ,	/**< Line to load font package. */
	DK4_GRA_PREAMBLE_PACKAGE ,		/**< Line to load other packages. */
	DK4_GRA_PREAMBLE_OTHER			/**< Any other configuration line. */
};



/**	Output structure to produce a PS or EPS file.
*/
typedef struct {
	int				 llev;		/**< PS language level. */
	int				 dsc;		/**< Flag: Write DSC comments. */
	int				 fspd;		/**< Flag: Use setpagedevice for paper size. */
	int				 fdu;		/**< Flag: Duplex. */
	int				 ftu;		/**< Flag: Duplex and tumble. */
} dk4_gra_ps_output_t;



/**	Output structure to produce a PDF file.
*/
typedef struct {
	dk4_sto_t		*s_imagno;	/**< Images container by object number. */
	dk4_sto_it_t	*i_imagno;	/**< Images iterator. */
	dk4_sto_t		*s_images;	/**< Images container by data source. */
	dk4_sto_it_t	*i_images;	/**< Images iterator. */
	dk4_sto_t		*s_objpos;	/**< Object positions container. */
	dk4_sto_it_t	*i_objpos;	/**< Object positions iterator. */
	size_t			 nextobj;	/**< Object number of next XObject. */
	size_t			 unxo;		/**< Number of XObjects without file name. */
} dk4_gra_pdf_output_t;



/**	Output structure to produce a PGF file.
*/
typedef struct {
	dk4_font_collector_t	*fc;		/**< Font collector. */
	dk4_sto_t				*s_imagno;	/**< Images container by number. */
	dk4_sto_it_t			*i_imagno;	/**< Images iterator. */
	dk4_sto_t				*s_images;	/**< Images container by data source. */
	dk4_sto_it_t			*i_images;	/**< Images iterator. */
	dk4_sto_t				*s_prelfo;	/**< Containter for font setup. */
	dk4_sto_it_t			*i_prelfo;	/**< Font setup iterator. */
	dk4_sto_t				*s_prelpa;	/**< Container for packages. */
	dk4_sto_it_t			*i_prelpa;	/**< Packages iterator. */
	dk4_sto_t				*s_prelot;	/**< Container for other setup. */
	dk4_sto_it_t			*i_prelot;	/**< Other setup iterator. */
	double					 dfs;		/**< Document font size. */
	size_t					 n_images;	/**< Next image number. */
	size_t					 n_prelfo;	/**< Number of font setup lines. */
	size_t					 n_prelpa;	/**< Number of package setup lines. */
	size_t					 n_prelot;	/**< Number of other setup lines. */
	int						 sa;		/**< Flag: Produce standalone doc. */
} dk4_gra_pgf_output_t;



/**	Union of output structure types.
*/
typedef union {
	dk4_gra_ps_output_t		 ps;		/**< Produce PS/EPS output. */
	dk4_gra_pdf_output_t	 pdf;		/**< Produce PDF output. */
	dk4_gra_pgf_output_t	 pgf;		/**< Produce PGF output. */
} dk4_gra_all_output_t;



/**	Output structure to produce a graphics file.
*/
typedef struct {
	dk4_gra_all_output_t	 out;	/**< Output structure. */
	dk4_cs_conv_ctx_t		 cscctx;	/**< Color space conversion context. */
	dk4_sto_t				*s_pages;	/**< Pages container. */
	dk4_sto_it_t			*i_pages;	/**< Iterator through container. */
	dkChar					*fn;	/**< Output file name. */
	void					*curpg;	/**< Current page. */
	double					 cur_x;	/**< Current x position. */
	double					 cur_y;	/**< Current y position. */
	double					 patlw;	/**< Pattern line width. */
	size_t					 pages;	/**< Number of pages. */
	size_t					 w;		/**< Image width. */
	size_t					 h;		/**< Image height. */
	int						 dr;	/**< Output driver. */
	int						 gscp;	/**< Flag: Graphics state pattern clip. */
	int						 eor;	/**< Flag: Use even-odd-rule fill clip. */
	int						 le;	/**< Previous error. */
	int						 lec;	/**< Previous error code. */
	int						 len;	/**< Number how often previous error. */
	int						 docfl;	/**< Document flag set. */
} dk4_gra_t;



/**	Point coordinates in a graphics.
*/
typedef struct {
	double	x;						/**< X value. */
	double	y;						/**< Y value. */
} dk4_gra_point_t;



#ifdef	__cplusplus
extern "C" {
#endif


/**	Open output structure to create a PDF file.
	@param	fn		File name for output file, NULL for standard output.
	@param	w		Image width in bp.
	@param	h		Image height in bp.
	@param	docfl	Document flags.
	The flags can contain both document and page flags, page flags
	here are applied as default page flags for pages added by the
	dk4gra_page() function.

	The following document flags are available:

					- DK4_GRA_DOC_FLAG_PS2<br>
					  to produce PS level 2 instead of level 3,
					- DK4_GRA_DOC_FLAG_EPS<br>
					  to produce EPS instead of PS,
					- DK4_GRA_DOC_FLAG_PS_DSC<br>
					  to write document structuring comments,
					- DK4_GRA_DOC_FLAG_FORCE_GRAY<br>
					  to enforce grayscaled output.

	The following page flags are available:

					- DK4_GRA_PAGE_FLAG_NO_CLIP<br>
					  to skip setting the clip path to page size,
					- DK4_GRA_PAGE_FLAG_NO_BG<br>
					  to skip filling the page with a white background,
					- DK4_GRA_PAGE_FLAG_NOT_COMPRESSED<br>
					  to create an uncompressed page contents stream
					  in PDF output (intended for debugging only).

	@param	erp		Error report, may be NULL.
	@return	Valid pointer to new structure on success, NULL on error.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if fn is NULL, w or h is 0,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available.
*/

dk4_gra_t *
dk4gra_open_pdf(
	const dkChar	*fn,
	size_t			 w,
	size_t			 h,
	int				 docfl,
	dk4_er_t		*erp
);


/**	Open output structure to create a PS or EPS file.
	@param	fn		File name for output file, NULL for standard output.
	@param	w		Image width in bp.
	@param	h		Image height in bp.
	@param	docfl	Document flags.
	The flags can contain both document and page flags, page flags
	here are applied as default page flags for pages added by the
	dk4gra_page() function.
	@param	erp		Error report, may be NULL.
	@return	Valid pointer to new structure on success, NULL on error.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if fn is NULL, w or h is 0 or ll is neither 2 nor 3.
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available.
*/

dk4_gra_t *
dk4gra_open_ps(
	const dkChar	*fn,
	size_t			 w,
	size_t			 h,
	int				 docfl,
	dk4_er_t		*erp
);


/**	Open output structure to create a PGF file.
	@param	fn		File name for output file, NULL for standard output.
	@param	w		Image width in bp.
	@param	h		Image height in bp.
	@param	docfl	Document flags.
	The flags can contain both document and page flags, page flags
	here are applied as default page flags for pages added by the
	dk4gra_page() function.
	@param	sa		Flag: Produce standalone TeX file.
	@param	erp		Error report, may be NULL.
	@return	Valid pointer to new structure on success, NULL on error.

	Error codes:

	- DK4_E_INVALID_ARGUMENTS<br>
	  if fn is NULL, w or h is 0,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available.
*/

dk4_gra_t *
dk4gra_open_pgf(
	const dkChar	*fn,
	size_t			 w,
	size_t			 h,
	int				 docfl,
	int				 sa,
	dk4_er_t		*erp
);


/**	Set color space conversion context.
	@param	gra		Output structure.
	@param	ctx		Color space conversion context to copy.
	@param	backptr	Address of success variable to reset on error.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra or ctx is NULL.
*/

void
dk4gra_set_color_conversion(
	dk4_gra_t				*gra,
	dk4_cs_conv_ctx_t const	*ctx,
	int						*backptr,
	dk4_er_t				*erp
);


/**	Write output file and close output structure.
	@param	gra		Output structure.
	@param	erp		Error report, may be NULL.
	@param	backptr	Address of success variable to reset on errors.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or in a state allowing this operation,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.

*/

void
dk4gra_write_and_close(
	dk4_gra_t		*gra,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Write output file and close output structure.
	@param	fout	Output file already opened.
	@param	gra		Output structure.
	@param	erp		Error report, may be NULL.
	@param	backptr	Address of success variable to reset on errors.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL,
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is not in a state allowing this operation,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/
void
dk4gra_write_file_and_close(
	FILE			*fout,
	dk4_gra_t		*gra,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Close output structure (without writing output file).
	You might want to use this function instead of dk4gra_write_and_close()
	if the drawing functions indicated an error.
	@param	gra	Output structure.

*/

void
dk4gra_close(
	dk4_gra_t		*gra
);


/**	Start new page.
	Default flags are used for the page:
	- The clip path is set to the image dimensions.
	- Background is filled white.
	- For PDF the contents stream is compressed.
	To start a new page with different setup, use dk4gra_page_with_flags()
	instead and specify flags.
	@param	gra		Output structure.
	@param	erp		Error report, may be NULL.
	@param	backptr	Address of success variable to reset on errors.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL, or in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_page(
	dk4_gra_t		*gra,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Start new page with non-default setup.
	@param	gra		Output structure.
	@param	flags	Or-combined flags:
					- DK4_GRA_PAGE_FLAG_NO_CLIP<br>
					  to avoid setting the clip path at start of page,
					- DK4_GRA_PAGE_FLAG_NO_BG<br>
					  to avoid white background filling,
					- DK4_GRA_PAGE_FLAG_NOT_COMPRESSED<br>
					  to avoid compression of page content stream in PDF.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_page_with_flags(
	dk4_gra_t		*gra,
	int				 flags,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Set flag for simplified gsave/grestore handling.
	Set this flag, if you use gsave and grestore only when dealing
	with clip path for pattern filling.
	@param	gra	Output structure.
	@param	val	New flag value.
	@param	erp	Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL.
*/
void
dk4gra_set_gs_for_pattern_only(
	dk4_gra_t		*gra,
	int				 val,
	dk4_er_t		*erp
);


/**	Save current graphics state (especially clip path).
	@param	gra		Output structure.
	@param	erp		Error report, may be NULL.
	@param	backptr	Address of success variable to reset on errors.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_gsave(
	dk4_gra_t		*gra,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Restore graphics state (especially clip path).
	@param	gra		Output structure.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_grestore(
	dk4_gra_t		*gra,
	int				*backptr,
	dk4_er_t		*erp
);



/**	Set line width.
	@param	gra		Output structure.
	@param	lw		Line width in bp.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation.
*/

void
dk4gra_set_line_width(
	dk4_gra_t		*gra,
	double			 lw,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Set line style.
	@param	gra		Output structure.
	@param	ls		Line style.
	@param	sv		Style value (dash length in bp).
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation.
*/

void
dk4gra_set_line_style(
	dk4_gra_t		*gra,
	dk4_gra_ls_t	 ls,
	double			 sv,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Set line cap.
	@param	gra		Output structure.
	@param	lc		Line cap type.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation.
*/

void
dk4gra_set_line_cap(
	dk4_gra_t		*gra,
	dk4_gra_lc_t	 lc,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Set line join.
	@param	gra		Output structure.
	@param	lj		Line join type.
	@param	ml		Miter limit, only used if lj is DK4_GRA_LJ_MITERED.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation.
*/

void
dk4gra_set_line_join(
	dk4_gra_t		*gra,
	dk4_gra_lj_t	 lj,
	double			 ml,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Set fill color to gray.
	@param	gra		Output structure.
	@param	g		Gray value in interval 0 to 1.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation.
*/

void
dk4gra_set_fill_gray(
	dk4_gra_t		*gra,
	double			 g,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Set fill color to RGB.
	@param	gra		Output structure.
	@param	r		Red value in interval 0 to 1.
	@param	g		Green value in interval 0 to 1.
	@param	b		Blue value in interval 0 to 1.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation.
*/

void
dk4gra_set_fill_rgb(
	dk4_gra_t		*gra,
	double			 r,
	double			 g,
	double			 b,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Set fill color to CMYK.
	@param	gra		Output structure.
	@param	c		Cyan value in interval 0 to 1.
	@param	m		Magenta value in interval 0 to 1.
	@param	y		Yellow value in interval 0 to 1.
	@param	k		Black value in interval 0 to 1.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation.
*/

void
dk4gra_set_fill_cmyk(
	dk4_gra_t		*gra,
	double			 c,
	double			 m,
	double			 y,
	double			 k,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Set stroke color to gray.
	@param	gra		Output structure.
	@param	g		Gray value in interval 0 to 1.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation.
*/

void
dk4gra_set_stroke_gray(
	dk4_gra_t		*gra,
	double			 g,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Set stroke color to RGB.
	@param	gra		Output structure.
	@param	r		Red value in interval 0 to 1.
	@param	g		Green value in interval 0 to 1.
	@param	b		Blue value in interval 0 to 1.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation.
*/

void
dk4gra_set_stroke_rgb(
	dk4_gra_t		*gra,
	double			 r,
	double			 g,
	double			 b,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Set stroke color to CMYK.
	@param	gra		Output structure.
	@param	c		Cyan value in interval 0 to 1.
	@param	m		Magenta value in interval 0 to 1.
	@param	y		Yellow value in interval 0 to 1.
	@param	k		Black value in interval 0 to 1.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation.
*/

void
dk4gra_set_stroke_cmyk(
	dk4_gra_t		*gra,
	double			 c,
	double			 m,
	double			 y,
	double			 k,
	int				*backptr,
	dk4_er_t		*erp
);



/**	Prepare output structure for a fill operation.
	Use this function before you start to construct a path you plan to fill.
	@param	gra		Output structure.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_prepare_fill(
	dk4_gra_t	*gra,
	int			*backptr,
	dk4_er_t	*erp
);


/**	Prepare output structure for a stroke operation.
	Use this function before you start to construct a path you plan to stroke.
	@param	gra		Output structure.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_prepare_stroke(
	dk4_gra_t	*gra,
	int			*backptr,
	dk4_er_t	*erp
);


/**	Prepare output structure for a combined fill and stroke operation.
	Use this function before you start to construct a path you plan to
	fill and stroke.
	@param	gra		Output structure.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_prepare_fill_and_stroke(
	dk4_gra_t	*gra,
	int			*backptr,
	dk4_er_t	*erp
);


/**	Check whether a combined fill and close operation is available
	for an output structure.
	@param	gra	Output structure to test.
	@return	1 if a fill-and-close operation is available, 0 otherwise.
*/

int
dk4gra_can_fill_and_stroke(
	const dk4_gra_t	*gra
);


/**	Fill current path.
	Note: Use dk4gra_prepare_fill() before you start to construct a path
	you plan to fill.
	The value of the even-odd-rule flag is used to choose either
	even-odd-rule or nonzero-winding-rule, the dk4gra_set_eorule() function
	can be used to set the flag.
	@param	gra		Output structure.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_fill(
	dk4_gra_t		*gra,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Stroke current path.
	Note: Use dk4gra_prepare_stroke() before you start to construct a path
	you plan to stroke.
	@param	gra		Output structure.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_stroke(
	dk4_gra_t		*gra,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Fill and stroke current path.
	Note: Use dk4gra_prepare_fill_and_stroke() before you start to construct
	a path you plan to fill and stroke.
	The value of the even-odd-rule flag is used to choose either
	even-odd-rule or nonzero-winding-rule, the dk4gra_set_eorule() function
	can be used to set the flag.
	@param	gra		Output structure.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_fill_and_stroke(
	dk4_gra_t		*gra,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Use current path for clipping.
	The value of the even-odd-rule flag is used to choose either
	even-odd-rule or nonzero-winding-rule, the dk4gra_set_eorule() function
	can be used to set the flag.
	@param	gra		Output structure.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_clip(
	dk4_gra_t		*gra,
	int				*backptr,
	dk4_er_t		*erp
);

/**	Set line width for pattern drawing.
	The pattern line width should be in range 0.0 to 2.0.
	@param	gra	Output structure.
	@param	plw	New pattern line width in bp.
*/

void
dk4gra_set_pattern_line_width(
	dk4_gra_t	*gra,
	double		 plw
);

/**	Pattern a region (clipping should be set to the path).
	@param	gra		Output structure.
	@param	xl		Left y coordinate.
	@param	xr		Right x coordinate.
	@param	yb		Bottom y coordinate.
	@param	yt		Top y coordinate.
	@param	pn		Pattern number.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_pattern(
	dk4_gra_t			*gra,
	double				 xl,
	double				 xr,
	double				 yb,
	double				 yt,
	dk4_gra_pattern_t	 pn,
	int					*backptr,
	dk4_er_t			*erp
);

/**	Set flag for even-odd-rule.
	If this flag is on, the even-odd-rule is used for filling and
	clipping. Otherwise the nonzero-winding rule is used.
	By default this flag is turned on when creating a dk4_gra_t structure.
	@param	gra		Output structure.
	@param	val		New flag value.
*/
void
dk4gra_set_eorule(
	dk4_gra_t	*gra,
	int			 val
);

/**	Start a new path and move to first point.
	@param	gra		Output structure.
	@param	x		X coordinate of start point.
	@param	y		Y coordinate of start point.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_newpath_moveto(
	dk4_gra_t		*gra,
	double			 x,
	double			 y,
	dk4_bb_t		*bbptr,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Add line from current point to new point to path.
	@param	gra		Output structure.
	@param	x		X coordinate of new point.
	@param	y		Y coordinate of new point.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_lineto(
	dk4_gra_t		*gra,
	double			 x,
	double			 y,
	dk4_bb_t		*bbptr,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Add Bezier curve segment from current point to new point in path.
	@param	gra		Output structure.
	@param	xc1		X coordinate of first control point.
	@param	yc1		Y coordinate of first control point.
	@param	xc2		X coordinate of second control point.
	@param	yc2		Y coordinate of second control point.
	@param	x		X coordinate of new point.
	@param	y		Y coordinate of new point.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_curveto(
	dk4_gra_t		*gra,
	double			 xc1,
	double			 yc1,
	double			 xc2,
	double			 yc2,
	double			 x,
	double			 y,
	dk4_bb_t		*bbptr,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Close current path.
	@param	gra		Output structure.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_closepath(
	dk4_gra_t		*gra,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Create path for a circle.
	@param	gra		Output structure.
	@param	xc		Center point x coordinate.
	@param	yc		Center point y coordinate.
	@param	r		Radius.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_circle(
	dk4_gra_t		*gra,
	double			 xc,
	double			 yc,
	double			 r,
	dk4_bb_t		*bbptr,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Create path for rectangle parallel to axes, optionally with
	rounded corners.
	@param	gra		Output structure.
	@param	xl		Left x coordinate.
	@param	xr		Right x coordinate.
	@param	yb		Bottom y coordinate.
	@param	yt		Top y coordinate.
	@param	r		Corner radius, maximum is a half of the smaller side length.
					Use negative values to avoid rounded corners.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_rectangle(
	dk4_gra_t		*gra,
	double			 xl,
	double			 xr,
	double			 yb,
	double			 yt,
	double			 r,
	dk4_bb_t		*bbptr,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Add path for an arc.
	@param	gra		Output structure.
	@param	xc		Center point x coordinate.
	@param	yc		Center point y coordinate.
	@param	ra		Radius.
	@param	start	Start angle in degree.
	@param	end		End angle in degree.
	@param	cl		Flag: Draw closed arc (piece of cake) instead of simple arc.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_arc(
	dk4_gra_t		*gra,
	double			 xc,
	double			 yc,
	double			 ra,
	double			 start,
	double			 end,
	int				 cl,
	dk4_bb_t		*bbptr,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Create path for an ellipse.
	@param	gra		Output structure.
	@param	xc		Center point x coordinate.
	@param	yc		Center point y coordinate.
	@param	rx		Radius in x direction.
	@param	ry		Radius in y direction.
	@param	rot		Rotation counterclockwise in degree.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_ellipse(
	dk4_gra_t		*gra,
	double			 xc,
	double			 yc,
	double			 rx,
	double			 ry,
	double			 rot,
	dk4_bb_t		*bbptr,
	int				*backptr,
	dk4_er_t		*erp
);


/**	Add simple (non-special) text to PGF graphics.
	The text is shown in the current fill color (non-stroking color)
	unless a color is specified in colspec.
	@param	gra		Output structure, must be initialized for PGF.
	@param	x		X coordinate.
	@param	y		Y coordinate.
	@param	rot		Rotation counterclockwise in degree.
	@param	txt		Text to show.
	@param	colspec	Color specification, may be NULL to use fill color.
	@param	ie		Text encoding, only used for char text.
	@param	ha		Horizontal alignment.
	@param	va		Vertical alignment.
	@param	fno		Font number.
	@param	fsz		Font size in pt.
	@param	fex		Flag: Use exact font (1) or similar font (0).
	@param	uc2l	UC to LaTeX conversion structure.
	@param	flags	Text flags DK4_GRA_TEXT_FLAG_xxx, can be or-combined.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_pgf_simple_text(
	dk4_gra_t			*gra,
	double				 x,
	double				 y,
	double				 rot,
	const dkChar		*txt,
	const char			*colspec,
	int					 ie,
	dk4_text_align_h_t	 ha,
	dk4_text_align_v_t	 va,
	int					 fno,
	double				 fsz,
	dk4_gra_tf_t		 fex,
	dk4_uc2l_t			*uc2l,
	int					 flags,
	int					*backptr,
	dk4_er_t			*erp
);


/**	Add simple (non-special) text to PGF graphics.
	The text is shown in the current fill color (non-stroking color)
	unless a color is specified in colspec.
	@param	gra		Output structure, must be initialized for PGF.
	@param	x		X coordinate.
	@param	y		Y coordinate.
	@param	rot		Rotation counterclockwise in degree.
	@param	txt		Text to show.
	@param	colspec	Color specification, may be NULL to use fill color.
	@param	ha		Horizontal alignment.
	@param	va		Vertical alignment.
	@param	fno		Font number.
	@param	fsz		Font size in pt.
	@param	fex		Flag: Use exact font (1) or similar font (0).
	@param	uc2l	UC to LaTeX conversion structure.
	@param	flags	Text flags DK4_GRA_TEXT_FLAG_xxx, can be or-combined.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_pgf_simple_utf8_text(
	dk4_gra_t			*gra,
	double				 x,
	double				 y,
	double				 rot,
	const char			*txt,
	const char			*colspec,
	dk4_text_align_h_t	 ha,
	dk4_text_align_v_t	 va,
	int					 fno,
	double				 fsz,
	dk4_gra_tf_t		 fex,
	dk4_uc2l_t			*uc2l,
	int					 flags,
	int					*backptr,
	dk4_er_t			*erp
);


/**	Add special text to PGF graphics.
	The text is shown in the current fill color (non-stroking color)
	unless a color is specified in colspec.
	@param	gra		Output structure, must be initialized for PGF.
	@param	x		X coordinate.
	@param	y		Y coordinate.
	@param	rot		Rotation counterclockwise in degree.
	@param	txt		Text to show.
	@param	colspec	Color specification, may be NULL to use fill color.
	@param	ha		Horizontal alignment.
	@param	va		Vertical alignment.
	@param	fno		Font number.
	@param	fsz		Font size.
	@param	fex		Flag: Use exact font.
	@param	flags	Text flags DK4_GRA_TEXT_FLAG_xxx, can be or-combined.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_pgf_special_text(
	dk4_gra_t			*gra,
	double				 x,
	double				 y,
	double				 rot,
	const char			*txt,
	const char			*colspec,
	dk4_text_align_h_t	 ha,
	dk4_text_align_v_t	 va,
	int					 fno,
	double				 fsz,
	dk4_gra_tf_t		 fex,
	int					 flags,
	int					*backptr,
	dk4_er_t			*erp
);


/**	Set the font size for the documentclass line.
	@param	gra		Output structure, must be initialized for PGF.
	@param	fs		Font size in pt.
	@param	backptr	Address of success variable to reset on error.
	@param	erp		Error report, may be NULL.
*/
void
dk4gra_pgf_doc_font_size(
	dk4_gra_t			*gra,
	double				 fs,
	int					*backptr,
	dk4_er_t			*erp
);


/**	Add a preamble line.
	For font setup and package setup the lines added by this function
	replace the default contents.
	For other setup the lines added by this function are appended
	after the default contents.
	@param	gra		Output structure, must be initialized for PGF.
	@param	line	Line text without trailing newline.
	@param	tp		Line type: DK4_GRA_PREAMBLE_FONT, DK4_GRA_PREAMBLE_PACKAGE,
					or DK4_GRA_PREAMBLE_OTHER.
	@param	backptr	Address of success variable to reset on error.
	@param	erp		Error report, may be NULL.
*/

void
dk4gra_pgf_doc_preamble_line(
	dk4_gra_t	*gra,
	const char	*line,
	int			 tp,
	int			*backptr,
	dk4_er_t	*erp
);


/**	Add bitmap image with coordinates transformations already calculated.
	@param	gra		Output structure.
	@param	cotra	Array containing 5 elements for coordinates transformations.
	@param	bif		Bitmap image file.
	@param	fn		Image file name.
	@param	fno		Frame number. The frame number given here is used
	by the PDF output driver only. You must call
	dk4bif_set_current_frame() on the bitmap image file before calling
	this function.
	@param	ifl		Image flags.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or bif is NULL or a frame number other than 0
	  was specified for PGF output or gra is
	  not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/
void
dk4gra_bif_cotra_image(
	dk4_gra_t			*gra,
	double				*cotra,
	dk4_bif_t			*bif,
	const dkChar		*fn,
	size_t				 fno,
	int					 ifl,
	int					*backptr,
	dk4_er_t			*erp
);


/**	Add bitmap image XFig style from opened bitmap image file.
	@param	gra		Output structure.
	@param	xl		Left x coordinate.
	@param	xr		Right x coordinate.
	@param	yb		Bottom y coordinate.
	@param	yt		Top y coordinate.
	@param	bif		Bitmap image file.
	@param	fn		Image file name.
	@param	fno		Frame number (0 for first frame).
	@param	pos		Image positioning:
	- 0 not rotated, not flipped,
	- 1 rotated 90 degree counterclockwise, not flipped,
	- 2 rotated 180 degree counterclockwise, not flipped,
	- 3 rotated 270 degree counterclockwise, not flipped,
	- 4 not rotated, flipped,
	- 5 rotated 90 degree counterclockwise, flipped,
	- 6 rotated 180 degree counterclockwise, flipped,
	- 7 rotated 270 degree counterclockwise, flipped.
	@param	ifl		Image flags.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or bif is NULL or a frame number other than 0
	  was specified for PGF output or gra is
	  not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_bif_fig_image(
	dk4_gra_t			*gra,
	double				 xl,
	double				 xr,
	double				 yb,
	double				 yt,
	dk4_bif_t			*bif,
	const dkChar		*fn,
	size_t				 fno,
	int					 pos,
	int					 ifl,
	dk4_bb_t			*bbptr,
	int					*backptr,
	dk4_er_t			*erp
);


/**	Add bitmap image from opened bitmap image file.
	@param	gra		Output structure.
	@param	xl		Left x coordinate.
	@param	xr		Right x coordinate.
	@param	yb		Bottom y coordinate.
	@param	yt		Top y coordinate.
	@param	bif		Bitmap image file data.
	@param	fn		Image file name.
	@param	fno		Frame number (0 for first frame).
	@param	ifl		Image flags.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or bif is NULL or gra is
	  not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_bif_image(
	dk4_gra_t			*gra,
	double				 xl,
	double				 xr,
	double				 yb,
	double				 yt,
	dk4_bif_t			*bif,
	const dkChar		*fn,
	size_t				 fno,
	int					 ifl,
	dk4_bb_t			*bbptr,
	int					*backptr,
	dk4_er_t			*erp
);


/**	Add bitmap image specified by file name.
	@param	gra		Output structure.
	@param	xl		Left x coordinate.
	@param	xr		Right x coordinate.
	@param	yb		Bottom y coordinate.
	@param	yt		Top y coordinate.
	@param	fn		Image file name.
	@param	fno		Frame number (0 for first frame).
	@param	ctx		Bitmap image conversion context, may be NULL.
	@param	ifl		Image flags.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or bif is NULL or gra is
	  not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_image(
	dk4_gra_t			*gra,
	double				 xl,
	double				 xr,
	double				 yb,
	double				 yt,
	const dkChar		*fn,
	size_t				 fno,
	dk4_cs_conv_ctx_t	*ctx,
	int					 ifl,
	dk4_bb_t			*bbptr,
	int					*backptr,
	dk4_er_t			*erp
);


/**	Add bitmap image XFig style specified by file name.
	@param	gra		Output structure.
	@param	xl		Left x coordinate.
	@param	xr		Right x coordinate.
	@param	yb		Bottom y coordinate.
	@param	yt		Top y coordinate.
	@param	fn		Image file name.
	@param	fno		Frame number (0 for first frame).
	@param	ctx		Bitmap image conversion context, may be NULL.
	@param	pos		Image positioning:
	- 0 not rotated, not flipped,
	- 1 rotated 90 degree counterclockwise, not flipped,
	- 2 rotated 180 degree counterclockwise, not flipped,
	- 3 rotated 270 degree counterclockwise, not flipped,
	- 4 not rotated, flipped,
	- 5 rotated 90 degree counterclockwise, flipped,
	- 6 rotated 180 degree counterclockwise, flipped,
	- 7 rotated 270 degree counterclockwise, flipped.
	@param	ifl		Image flags.
	@param	bbptr	Bounding box, may be NULL.
	@param	backptr	Address of success variable to reset on errors.
	@param	erp		Error report, may be NULL.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if gra is NULL or bif is NULL or gra is
	  not in a state allowing this operation,
	- DK4_E_MATH_OVERFLOW<br>
	  on numeric overflow in memory size calculation,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if there is not enough memory available,
	- DK4_E_WRITE_FAILED<br>
	  if writing one ore multiple bytes to the stream failed,
	- DK4_E_FLUSH_FAILED<br>
	  if flushing data downwards failed.
*/

void
dk4gra_fig_image(
	dk4_gra_t			*gra,
	double				 xl,
	double				 xr,
	double				 yb,
	double				 yt,
	const dkChar		*fn,
	size_t				 fno,
	dk4_cs_conv_ctx_t	*ctx,
	int					 pos,
	int					 ifl,
	dk4_bb_t			*bbptr,
	int					*backptr,
	dk4_er_t			*erp
);


#ifdef	__cplusplus
}
#endif


/**	Number of points to calculate for a circle or ellipse.
*/
enum {
							/**	Number of points to calculate for a circle
								or ellipse.
							*/
	DK4_GRA_CIRCLE_POINTS	= 24
};


/* vim: set ai sw=4 ts=4 : */


#endif