The R Project SVN R

/*

 *  R : A Computer Language for Statistical Data Analysis

 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka

 *  Copyright (C) 1998--1999  R Development Core Team

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#ifndef GRAPHICS_H_

#define GRAPHICS_H_

#include "Defn.h"

#ifndef NA_REAL

#define NA_REAL R_NaReal

#endif

#ifndef NA_INTEGER

#define NA_INTEGER R_NaInt

#endif

#include <math.h>

#ifdef Windows

#include <windows.h>

#endif

#include <float.h>

#include <stdlib.h>

#include <stdio.h>

/*

 *	Some Notes on Color

 *

 *	R uses a 24-bit color model.  Colors are specified in 32-bit

 *	integers which are partitioned into 4 bytes as follows.

 *

 *		<-- most sig	    least sig -->

 *		+-------------------------------+

 *		|   0	| blue	| green |  red	|

 *		+-------------------------------+

 *

 *	The red, green and blue bytes can be extracted as follows.

 *

 *		red   = ((color	     ) & 255)

 *		green = ((color >>  8) & 255)

 *		blue  = ((color >> 16) & 255)

 */

#define R_RGB(r,g,b)	((r)|((g)<<8)|((b)<<16))

#define R_RED(col)	(((col)	   )&255)

#define R_GREEN(col)	(((col)>> 8)&255)

#define R_BLUE(col)	(((col)>>16)&255)

#define COLOR_TABLE_SIZE 256

/*

 *	Some Notes on Line Textures

 *

 *	Line textures are stored as an array of 4-bit integers within

 *	a single 32-bit word.  These integers contain the lengths of

 *	lines to be drawn with the pen alternately down and then up.

 *	The device should try to arrange that these values are measured

 *	in points if possible, although pixels is ok on most displays.

 *

 *	If newlty contains a line texture description it is decoded

 *	as follows:

 *

 *		ndash = 0;

 *		for(i=0 ; i<8 && newlty & 15 ; i++) {

 *			dashlist[ndash++] = newlty & 15;

 *			newlty = newlty>>4;

 *		}

 *		dashlist[0] = length of pen-down segment

 *		dashlist[1] = length of pen-up segment

 *		etc

 *

 *	An integer containing a zero terminates the pattern.  Hence

 *	ndash in this code fragment gives the length of the texture

 *	description.  If a description contains an odd number of

 *	elements it is replicated to create a pattern with an

 *	even number of elements.  (If this is a pain, do something

 *	different its not crucial).

 *

 */

/*--- The basic numbered & names line types; Here device-independent:

  e.g. "dashed" == "44",  "dotdash" == "1343"

*/

#define LTY_BLANK	-1

#define LTY_SOLID	0

#define LTY_DASHED	4 + (4<<4)

#define LTY_DOTTED	1 + (3<<4)

#define LTY_DOTDASH	1 + (3<<4) + (4<<8) + (3<<12)

#define LTY_LONGDASH	7 + (3<<4)

#define LTY_TWODASH	2 + (2<<4) + (6<<8) + (2<<12)

#define MAX_LAYOUT_ROWS 15

#define MAX_LAYOUT_COLS 15

	/* possible coordinate systems (for specifying locations) */

#define DEVICE	0	/* native device coordinates (rasters) */

#define NDC	1	/* normalised device coordinates x=(0,1), y=(0,1) */

#define INCHES 13	/* inches x=(0,width), y=(0,height) */

#define NIC	6	/* normalised inner region coordinates (0,1) */

#define OMA1	2	/* outer margin 1 (bottom) x=NIC, y=LINES */

#define OMA2	3	/* outer margin 2 (left) */

#define OMA3	4	/* outer margin 3 (top) */

#define OMA4	5	/* outer margin 4 (right) */

#define NFC	7	/* normalised figure region coordinates (0,1) */

#define NPC	16	/* normalised plot region coordinates (0,1) */

#define USER	12	/* user/data/world corrdinates */

			/* x=(xmin,xmax), y=(ymin,ymax) */

#define MAR1	8	/* figure margin 1 (bottom) x=USER(x), y=LINES */

#define MAR2	9	/* figure margin 2 (left) x=USER(y) y=LINES */

#define MAR3	10	/* figure margin 3 (top) x=USER(x), y=LINES */

#define MAR4	11	/* figure margin 4 (right) x=USER(y) y=LINES */

	/* possible units (for specifying dimensions) */

	/* all of the above, plus ... */

#define LINES 14	/* multiples of a line in the margin (mex) */

#define CHARS 15	/* multiples of text height (cex) */

#define R_MaxDevices 64

#define	DEG2RAD 0.01745329251994329576

typedef unsigned int rcolor;

typedef struct {

	double ax;

	double bx;

	double ay;

	double by;

} GTrans;

struct colorDataBaseEntry {

	char *name;	/* X11 Color Name */

	char *rgb;	/* #RRGGBB String */

	unsigned int code;  /* Internal R Color Code */

};

typedef struct colorDataBaseEntry ColorDataBaseEntry;

extern int R_ColorTableSize;

extern unsigned int R_ColorTable[];

extern ColorDataBaseEntry ColorDataBase[];

extern char *DefaultPalette[];

/* Graphics State:

 *

 * The following structure defines state for a graphics device driver.

 * Two copies are kept; the ``default'' set of values, and a set which

 * can be modified during calls to an application program.  When a

 * new graphics frame is started, the values revert to the defaults

 *

 */

typedef struct {

    /* Basic Device Driver Properties */

    /* These MUST be set by device drivers on open */

    /* These parameters cannot be set by the user */

    /* although left, right, bottom, and top can be */

    /* interrogated indirectly (i.e., par("din")) */

    /* and cra can be interrogated directly (i.e., par("cra")) */

    double left;	/* left raster coordinate */

    double right;	/* right raster coordinate */

    double bottom;	/* bottom raster coordinate */

    double top;		/* top raster coordinate */

    double xCharOffset;	/* x character addressing offset */

    double yCharOffset;	/* y character addressing offset */

    double yLineBias;	/* 1/2 interline space as fraction of line height */

    int canResizePlot;	/* can the graphics surface be resized */

    int canChangeFont;	/* device has multiple fonts */

    int canRotateText;	/* text can be rotated */

    int canResizeText;	/* text can be resized */

    int canClip;	/* Hardware clipping */

    /* a couple of the GRZ-like parameters that have to be */

    /* set by the device */

    double ipr[2];	/* Inches per raster; [0]=x, [1]=y */

    double asp;		/* Pixel aspect ratio = ipr[1]/ipr[0] */

    double cra[2];	/* Character size in rasters; [0]=x, [1]=y */

    /* Plot State */

    /* When the device driver is started this is 0 */

    /* After the first call to plot.new it is 1 */

    /* Every graphics operation except plot.new */

    /* should fail if state = 0 */

    /* This is checked at the highest internal function */

    /* level (e.g., do_lines, do_axis, do_plot_xy, ...) */

    int	state;		/* Plot State */

    int	valid;		/* valid layout ? */

    /* GRZ-like Graphics Parameters */

    /* ``The horror, the horror ... '' */

    /* Marlon Brando - Appocalypse Now */

    /* General Parameters -- set and interrogated directly */

    double adj;		/* String adjustment */

    int	ann;		/* Should annotation take place */

    int	ask;		/* User confirmation of ``page eject'' */

    rcolor bg;		/* **R ONLY** Background color */

    int	bty;		/* Box type */

    double cex;		/* Character expansion */

    rcolor col;		/* Plotting Color */

    double crt;		/* Character/string rotation */

    double din[2];	/* device size in inches */

    int	err;		/* Error repporting level */

    rcolor fg;		/* **R ONLY** Foreground Color */

    int	font;		/* Text font */

    double gamma;	/* Device Gamma Correction */

    int	lab[3];		/* Axis labelling */

			/* [0] = # ticks on x-axis */

			/* [1] = # ticks on y-axis */

			/* [2] = length of axis labels */

    int	las;		/* Label style (rotation) */

    int	lty;		/* Line texture */

    double lwd;		/* Line width */

    double mgp[3];	/* Annotation location */

			/* [0] = location of axis title */

			/* [1] = location of axis label */

			/* [2] = location of axis line */

    double mkh;		/* Mark size in inches */

    int	pch;		/* Plotting character */

    int	ps;		/* Text & symbol pointsize */

    int	smo;		/* Curve smoothness */

    double srt;		/* String Rotation */

    double tck;		/* Tick size as in S */

    double tcl;		/* Tick size in "lines" */

    double tmag;	/* **R ONLY** Title Magnification */

    int	type;		/* type of plot desired */

    double xaxp[3];	/* X Axis annotation */

			/* [0] = coordinate of lower tick */

			/* [1] = coordinate of upper tick */

			/* [2] = num tick intervals */

			/* almost always used internally */

    int	xaxs;		/* X Axis style */

    int	xaxt;		/* X Axis type */

    int	xpd;		/* Clip to plot region indicator */

    int	oldxpd;

    double yaxp[3];	/* Y Axis annotation */

    int	yaxs;		/* Y Axis style */

    int	yaxt;		/* Y Axis type */

    int	xlog;		/* Log Axis for X */

    int	ylog;		/* Log Axis for Y */

    /* Annotation Parameters */

    float cexbase;	/* Base character size */

    float cexmain;	/* Main title size */

    float cexlab;	/* xlab and ylab size */

    float cexsub;	/* Sub title size */

    float cexaxis;	/* Axis label size */

    int	fontmain;	/* Main title font */

    int	fontlab;	/* Xlab and ylab font */

    int	fontsub;	/* Subtitle font */

    int	fontaxis;	/* Axis label fonts */

    int	colmain;	/* Main title color */

    int	collab;		/* Xlab and ylab color */

    int	colsub;		/* Subtitle color */

    int	colaxis;	/* Axis label color */

    /* Layout Parameters */

    int	layout;		/* has a layout been specified */

    int	numrows;

    int	numcols;

    int	currentFigure;

    int	lastFigure;

    double heights[MAX_LAYOUT_ROWS];

    double widths[MAX_LAYOUT_COLS];

    int	cmHeights[MAX_LAYOUT_ROWS];

    int	cmWidths[MAX_LAYOUT_COLS];

    int	order[MAX_LAYOUT_ROWS][MAX_LAYOUT_COLS];

    int	rspct;	        /* 0 = none, 1 = full, 2 = see respect */

    int	respect[MAX_LAYOUT_ROWS][MAX_LAYOUT_COLS];

    int	mfind;		/* By row/col indicator */

    /* Layout parameters which can be set directly by the */

    /* user (e.g., par(fig=c(.5,1,0,1))) or otherwise are */

    /* calculated automatically */

    /* NOTE that *Units parameters are for internal use only */

    double fig[4];	/* (current) Figure size (proportion) */

			/* [0] = left, [1] = right */

			/* [2] = bottom, [3] = top */

    double fin[2];	/* (current) Figure size (inches) */

			/* [0] = width, [1] = height */

    int	fUnits;		/* (current) figure size units */

    int	defaultFigure;	/* calculate figure from layout ? */

    double plt[4];	/* (current) Plot size (proportions) */

			/* [0] = left, [1] = right */

			/* [2] = bottom, [3] = top */

    double pin[2];	/* (current) plot size (inches) */

			/* [0] = width, [1] = height */

    int	pUnits;		/* (current) plot size units */

    int	defaultPlot;	/* calculate plot from figure - margins ? */

    /* Layout parameters which are set directly by the user */

    double mar[4];	/* Plot margins in lines */

    double mai[4];	/* Plot margins in inches */

			/* [0] = bottom, [1] = left */

			/* [2] = top, [3] = right */

    int	mUnits;		/* plot margin units */

    double mex;		/* Margin expansion factor */

    double oma[4];	/* Outer margins in lines */

    double omi[4];	/* outer margins in inches */

    double omd[4];	/* outer margins in NDC */

			/* [0] = bottom, [1] = left */

			/* [2] = top, [3] = right */

    int	oUnits;		/* outer margin units */

    int	pty;		/* Plot type */

    /* Layout parameters which can be set by the user, but */

    /* almost always get automatically calculated anyway */

    double usr[4];	/* Graphics window */

			/* [0] = xmin, [1] = xmax */

			/* [2] = ymin, [3] = ymax */

    /* The logged usr parameter;  if xlog, use logusr[0:1] */

    /* if ylog, use logusr[2:3] */

    double logusr[4];

    /* Layout parameter: Internal flags */

    int	new;		/* Clean plot ? */

    int	devmode;	/* creating new image or adding to existing one */

    /* Coordinate System Mappings */

    /* These are only used internally (i.e., cannot be */

    /* set directly by the user) */

    /* The reliability of these parameters relies on */

    /* the fact that plot.new is the */

    /* first graphics operation called in the creation */

    /* of a graph */

    /* udpated per plot.new */

    double xNDCPerChar;	/* Nominal character width (NDC) */

    double yNDCPerChar;	/* Nominal character height (NDC) */

    double xNDCPerLine;	/* Nominal line width (NDC) */

    double yNDCPerLine;	/* Nominal line height (NDC) */

    double xNDCPerInch;	/* xNDC -> Inches */

    double yNDCPerInch;	/* yNDC -> Inches */

    /* updated per plot.new and if inner2dev changes */

    GTrans fig2dev;	/* Figure to device */

    /* udpated per DevNewPlot and if ndc2dev changes */

    GTrans inner2dev;	/* Inner region to device */

    /* udpated per device resize */

    GTrans ndc2dev;	/* NDC to raw device */

    /* updated per plot.new and per plot.window */

    GTrans win2fig;	/* Window to figure mapping */

    /* NOTE: if user has not set fig and/or plt then */

    /* they need to be updated per plot.new too */

    /* device operations */

    int (*open)();

    void (*close)();

    void (*activate)();

    void (*deactivate)();

    void (*resize)();

    void (*newPage)();

    void (*clip)();

    double (*strWidth)();

    void (*line)();

    void (*polyline)();

    void (*text)();

    void (*dot)();

    void (*rect)();

    void (*circle)();

    void (*polygon)();

    int (*locator)();

    void (*mode)();

    void (*hold)();

    void (*metricInfo)();

} GPar;

typedef struct {

	GPar dp;		/* current device default parameters */

	GPar gp;		/* current device current parameters */

	GPar dpSaved;		/* saved device default parameters */

	void *deviceSpecific;	/* pointer to device specific parameters */

	int displayListOn;	/* toggle for display list status */

	SEXP displayList;	/* display list */

} DevDesc;

		/* Drivers from ../main/dev....c , description there: */

int PSDeviceDriver(DevDesc*, char*, char*, char*,

		   char*, char*, double, double, double, double, int, int);

int PicTeXDeviceDriver(DevDesc*, char*, char*, char*, double, double, int);

/*ifdef Unix : ../unix/devX11.h	 only in few places*/

#ifdef Win32

int WinDeviceDriver(char**, int, double*, int);

#endif

#ifdef OLD_Macintosh

int MacDeviceDriver(char**, int, double*, int);

#endif

#ifndef R_NO_REMAP

#define addDevice		Rf_addDevice

#define char2col		Rf_char2col

#define col2name		Rf_col2name

#define copyDisplayList		Rf_copyDisplayList

#define copyGPar		Rf_copyGPar

#define CreateAtVector		Rf_CreateAtVector

#define curDevice		Rf_curDevice

#define CurrentDevice		Rf_CurrentDevice

#define currentFigureLocation	Rf_currentFigureLocation

#define deviceNumber		Rf_deviceNumber

#define DevNull			Rf_DevNull

#define FixupCex		Rf_FixupCex

#define FixupCol		Rf_FixupCol

#define FixupFont		Rf_FixupFont

#define FixupLty		Rf_FixupLty

#define FixupLwd		Rf_FixupLwd

#define FixupPch		Rf_FixupPch

#define FixupVFont		Rf_FixupVFont

#define GArrow			Rf_GArrow

#define GBox			Rf_GBox

#define GCheckState		Rf_GCheckState

#define GCircle			Rf_GCircle

#define GClip			Rf_GClip

#define GClipPolygon		Rf_GClipPolygon

#define GConvert		Rf_GConvert

#define GConvertX		Rf_GConvertX

#define GConvertXUnits		Rf_GConvertXUnits

#define GConvertY		Rf_GConvertY

#define GConvertYUnits		Rf_GConvertYUnits

#define GEndPath		Rf_GEndPath

#define GetAxisLimits		Rf_GetAxisLimits

#define GetDevice		Rf_GetDevice

#define GExpressionHeight	Rf_GExpressionHeight

#define GExpressionWidth	Rf_GExpressionWidth

#define GForceClip		Rf_GForceClip

#define GInit			Rf_GInit

#define GLine			Rf_GLine

#define GLocator		Rf_GLocator

#define GLPretty		Rf_GLPretty

#define GMapUnits		Rf_GMapUnits

#define GMapWin2Fig		Rf_GMapWin2Fig

#define GMathText		Rf_GMathText

#define GMetricInfo		Rf_GMetricInfo

#define GMMathText		Rf_GMMathText

#define GMode			Rf_GMode

#define GMtext			Rf_GMtext

#define GNewPlot		Rf_GNewPlot

#define GPolygon		Rf_GPolygon

#define GPolyline		Rf_GPolyline

#define GPretty			Rf_GPretty

#define GRect			Rf_GRect

#define GReset			Rf_GReset

#define GRestore		Rf_GRestore

#define GRestorePars		Rf_GRestorePars

#define GSavePars		Rf_GSavePars

#define GScale			Rf_GScale

#define GSetState		Rf_GSetState

#define GSetupAxis		Rf_GSetupAxis

#define GStartPath		Rf_GStartPath

#define GStrHeight		Rf_GStrHeight

#define GStrWidth		Rf_GStrWidth

#define GSymbol			Rf_GSymbol

#define GText			Rf_GText

#define GVStrHeight		Rf_GVStrHeight

#define GVStrWidth		Rf_GVStrWidth

#define GVText			Rf_GVText

#define inhibitDisplayList	Rf_inhibitDisplayList

#define initDisplayList		Rf_initDisplayList

#define InitGraphics		Rf_InitGraphics

#define KillAllDevices		Rf_KillAllDevices

#define KillDevice		Rf_KillDevice

#define killDevice		Rf_killDevice

#define labelformat		Rf_labelformat

#define LTYget			Rf_LTYget

#define LTYpar			Rf_LTYpar

#define name2col		Rf_name2col

#define NewFrameConfirm		Rf_NewFrameConfirm

#define nextDevice		Rf_nextDevice

#define NoDevices		Rf_NoDevices

#define NumDevices		Rf_NumDevices

#define playDisplayList		Rf_playDisplayList

#define prevDevice		Rf_prevDevice

#define ProcessInlinePars	Rf_ProcessInlinePars

#define recordGraphicOperation	Rf_recordGraphicOperation

#define rgb2col			Rf_rgb2col

#define RGB2rgb			Rf_RGB2rgb

#define RGBpar			Rf_RGBpar

#define ScaleColor		Rf_ScaleColor

#define selectDevice		Rf_selectDevice

#define Specify2		Rf_Specify2

#define StartDevice		Rf_StartDevice

#define str2col			Rf_str2col

#define StrMatch		Rf_StrMatch

#define xDevtoNDC		Rf_xDevtoNDC

#define xDevtoNFC		Rf_xDevtoNFC

#define xNPCtoUsr		Rf_xNPCtoUsr

#define yDevtoNDC		Rf_yDevtoNDC

#define yDevtoNFC		Rf_yDevtoNFC

#define yNPCtoUsr		Rf_yNPCtoUsr

#endif

		/* User Callable Functions */

/*-------------------------------------------------------------------

 *

 *  DEVICE FUNCTIONS are concerned with the creation and destruction

 *  of devices.

 *

 */

/* Return a pointer to the current device. */

DevDesc* CurrentDevice();

/* Return a pointer to a device which is identified by number */

DevDesc* GetDevice(int);

/* Initialise internal device structures. */

void InitGraphics(void);

/* Kill device which is identified by number. */

void KillDevice(DevDesc*);

/* Kill all active devices (used at shutdown). */

void KillAllDevices();

/* Is the null device the current device? */

int NoDevices();

/* How many devices exist ? (>= 1) */

int NumDevices();

/* Get the index of the specified device. */

int deviceNumber(DevDesc*);

/* Create a new device. */

int StartDevice(SEXP, SEXP, int, SEXP, int);

void DevNull(void);

/* Miscellaneous */

void NewFrameConfirm();

void recordGraphicOperation(SEXP, SEXP, DevDesc*);

void initDisplayList();

void copyDisplayList(int);

void playDisplayList(DevDesc*);

void inhibitDisplayList(DevDesc*);

/*-------------------------------------------------------------------

 *

 *  DEVICE UTILITIES are concerned with providing information

 *  for R interpreted functions.

 *

 */

/* Return the number of the current device. */

int curDevice();

/* Return the number of the next device. */

int nextDevice(int);

/* Return the number of the previous device. */

int prevDevice(int);

/* Make the specified device (specified by number) the current device */

int selectDevice(int);

/* Kill device which is identified by number. */

void killDevice(int);

/* ...NO DOC... */

void addDevice(DevDesc *);

/*-------------------------------------------------------------------

 *

 *  GPAR FUNCTIONS are concerned with operations on the

 *  entire set of graphics parameters for a device

 *  (e.g., initialisation, saving, and restoring)

 */

/* Default the settings for general graphical parameters

 * (i.e., defaults that do not depend on the device type: */

void GInit(GPar*);

/* Reset the current graphical parameters from the default ones: */

void GRestore(DevDesc*);

/* Make a temporary copy of the current parameters */

void GSavePars(DevDesc*);

/* Restore the temporary copy saved by GSavePars */

void GRestorePars(DevDesc*);

		/* More Programmer GPar functions */

void ProcessInlinePars(SEXP, DevDesc*);

void Specify2(char*, SEXP, DevDesc*);

void RecordGraphicsCall(SEXP);

SEXP FixupPch(SEXP, int);

SEXP FixupLty(SEXP, int);

SEXP FixupFont(SEXP, int);

SEXP FixupCol(SEXP, unsigned int);

SEXP FixupCex(SEXP, double);

SEXP FixupLwd(SEXP, double);

SEXP FixupVFont(SEXP);

/*-------------------------------------------------------------------

 *

 *  DEVICE STATE FUNCTIONS are concerned with getting and setting

 *  the current state of the device;  is it ready to be drawn into?

 */

/* has plot.new been called yet? */

void GCheckState(DevDesc*);

/* Set to 1 when plot.new succeeds

 * Set to 0 when don't want drawing to go ahead */

void GSetState(int, DevDesc*);

/*-------------------------------------------------------------------

 *

 *  GRAPHICAL PRIMITIVES are the generic front-end for the functions

 *  that every device driver must provide.

 *

 *  NOTE that locations supplied to these functions may be in any

 *  of the valid coordinate systems (each function takes a "coords"

 *  parameter to indicate the coordinate system);  the device-specific

 *  version of the function is responsible for calling GConvert to get

 *  the location into device coordinates.

 *

 */

/* Draw a circle, centred on (x,y) with radius r (in inches). */

void GCircle(double, double, int, double, int, int, DevDesc*);

/* Set clipping region (based on current setting of dd->gp.xpd).

 * Only clip if new clipping region is different from the current one */

void GClip(DevDesc*);

/* Polygon clipping: */

int GClipPolygon(double *, double *, int, int, int,

		 double *, double *, DevDesc *);

/* Always clips */

void GForceClip(DevDesc*);

/* Draw a line from (x1,y1) to (x2,y2): */

void GLine(double, double, double, double, int, DevDesc*);

/* Return the location of the next mouse click: */

int  GLocator(double*, double*, int, DevDesc*);

/* Return the height, depth, and width of the specified

 * character in the specified units: */

void GMetricInfo(int, double*, double*, double*, int, DevDesc*);

/* Set device "mode" (drawing or not drawing) here for windows and mac drivers.

 */

void GMode(int, DevDesc*);

/* Draw a polygon using the specified lists of x and y values: */

void GPolygon(int, double*, double*, int, int, int, DevDesc*);

/* Draw series of straight lines using the specified lists of x and y values: */

void GPolyline(int, double*, double*, int, DevDesc*);

/* Draw a rectangle given two opposite corners: */

void GRect(double, double, double, double, int, int, int, DevDesc*);

/* Return the height of the specified string in the specified units: */

double GStrHeight(char*, int, DevDesc*);

/* Return the width of the specified string in the specified units */

double GStrWidth(char*, int, DevDesc*);

/* Draw the specified text at location (x,y) with the specified

 * rotation and justification: */

void GText(double, double, int, char*, double, double, double, DevDesc*);

void GStartPath(DevDesc*);

void GEndPath(DevDesc*);

void GMathText(double, double, int, SEXP, double, double, double, DevDesc*);

void GMMathText(SEXP, int, double, int, double, int, DevDesc*);

void GVText(double x, double y, int unit, char* s, int typeface, int fontindex,

	    double xadj, double yadj, double rot, DevDesc *dd);

double GVStrWidth(const unsigned char *s, int typeface, int fontindex,

		  int unit, DevDesc *dd);

double GVStrHeight(const unsigned char *s, int typeface, int fontindex,

		   int unit, DevDesc *dd);

/*-------------------------------------------------------------------

 *

 *  GRAPHICAL UTILITIES are functions that produce graphical output

 *  using the graphical primitives (i.e., they are generic - NOT

 *  device-specific).

 *

 */

/* Draw a line from (x1,y1) to (x2,y2) with an arrow head

 * at either or both ends. */

void GArrow(double, double, double, double, int, double, double, int, DevDesc*);

/* Draw a box around specified region:

 *  1=plot region, 2=figure region, 3=inner region, 4=device. */

void GBox(int, DevDesc*);

/* Return a "nice" min, max and number of intervals for a given

 * range on a linear or _log_ scale, respectively: */

void GPretty(double*, double*, int*);

void GLPretty(double*, double*, int*);

/* Draw text in margins. */

void GMtext(char*, int, double, int, double, int, DevDesc*);

/* Draw one of the predefined symbols (circle, square, diamond, ...) */

void GSymbol(double, double, int, int, DevDesc*);

double GExpressionHeight(SEXP, int, DevDesc*);

double GExpressionWidth(SEXP, int, DevDesc*);

/*-------------------------------------------------------------------

 *

 *  COLOUR CODE is concerned with the internals of R colour representation

 *

 */

/* Convert an R colour specification (which might be a number or */

/* a string) into an internal colour specification. */

unsigned int RGBpar(SEXP, int);

/*-------------------------------------------------------------------

 *

 *  LINE TEXTURE CODE is concerned with the internals of R

 *  line texture representation.

 */

unsigned int LTYpar(SEXP, int);

SEXP LTYget(unsigned int);

/*----------------------------------------------------------------------

 *

 *  TRANSFORMATIONS are concerned with converting locations between

 *  coordinate systems and dimensions between different units.

 */

/* Convert an R unit (e.g., "user") into an internal unit (e.g., USER)> */

int GMapUnits(int);

/* Convert a LOCATION from one coordinate system to another: */

void GConvert(double*, double*, int, int, DevDesc*);

double GConvertX(double, int, int, DevDesc*);

double GConvertY(double, int, int, DevDesc*);

/* Convert an x/y-dimension from one set of units to another: */

double GConvertXUnits(double, int, int, DevDesc*);

double GConvertYUnits(double, int, int, DevDesc*);

/* Set up the different regions on a device (i.e., inner region,

 * figure region, plot region) and transformations for associated

 * coordinate systems (called whenever anything that affects the

 * coordinate transformations changes):

 */

void GReset(DevDesc*);

/* Set up the user coordinate transformations: */

void GMapWin2Fig(DevDesc*);

/* Set up the device for a new plot by Resetting graphics parameters

 * and Resetting the regions and coordinate Systems */

DevDesc *GNewPlot(int, int);

/* Set up the user coordinates based on the axis limits */

void GScale(double, double, int, DevDesc*);

/* Set up the axis limits based on the user coordinates */

void GSetupAxis(int, DevDesc*);

/* Return row and column of current figure in the layout matrix */

void currentFigureLocation(int*, int*, DevDesc*);

double R_Log10(double);

double xDevtoNDC(double x, DevDesc *dd);

double yDevtoNDC(double y, DevDesc *dd);

double xDevtoNFC(double x, DevDesc *dd);

double yDevtoNFC(double y, DevDesc *dd);

double xNPCtoUsr(double, DevDesc*);

double yNPCtoUsr(double, DevDesc*);

		/* Miscellaneous (from graphics.c & colors.c) */

unsigned int rgb2col(char *);

unsigned int name2col(char *);

unsigned int char2col(char *s);/* rgb2col() or name2col() */

char* col2name(unsigned int);

unsigned int str2col(char *s);

unsigned int ScaleColor(double x);

char* RGB2rgb(unsigned int, unsigned int, unsigned int);

int StrMatch(char *s, char *t);

void copyGPar(GPar *, GPar *);

/* some functions that plot.c needs to share with plot3d.c */

SEXP CreateAtVector(double*, double*, int, int);

void GetAxisLimits(double, double, double*, double*);

SEXP labelformat(SEXP);

/* Vector fonts */

double GVStrWidth (const unsigned char *, int, int, int, DevDesc *);

double GVStrHeight (const unsigned char *, int, int, int, DevDesc *);

void GVText (double, double, int, char *, int, int, 

	     double, double, double, DevDesc *);

#endif