/* Copyright (c) 1991 - 1994 Heinz W. Werntges. All rights reserved. */
/** chardraw.h
**
** 92/02/19 V 1.01 HWW Derived from sprite.h (V 2.01)
** 92/05/28 V 1.02 HWW plot_symbol_char() added
** 99/02/01 V 1.03 MK charsets 5 and 7 added
**
** Structure definition as used by pplib for character drawing
**/
#define JOFF 4
#define _BS '\010' /* Backspace */
#define _HT '\011' /* Horizontal Tab */
#define _LF '\012' /* Line Feed */
#define _VT '\013' /* Vertical Tab */
#define _CR '\015' /* Carriage Return */
#define _SO '\016' /* Shift Out */
#define _SI '\017' /* Shift In */
/**
** Description of struct TextPar (used for internal font drawing):
**
** A character size is defined by its WIDTH and HEIGHT.
** The distance from char. to char. is given by SPACE, from
** text line to text line by LINE.
** WIDTH, SPACE are fractions of the P1,P2 window width,
** SPACE, LINE are fractions of the P1,P2 window height.
** The writing direction is DIR, which is the angle [0,2*M_PI]
** between text line & x direction.
** Set SLANT to an angle != 0 if characters are to appear e.g. italics-like.
** Stroked fonts selectable by setting FONT to > 0
** (not yet supported).
**
** NOTE: struct TextPar was inherited from former project "plib" (a plot
** library which also featured character drawing). It was not
** designed from scratch for the purpose of HP-GL font management.
** However, for charset 0 it does a fair job here, mainly because
** plib itself had been inspired by HP-GL.
**/
typedef struct
{
float width; /* Width of a char (x dirc.) */
float height; /* Height of a char (y dirc.) */
float space; /* Distance between characters */
float line; /* Distance betw. char. lines */
float espace; /* Extra char space rel. to 'space' */
float eline; /* Extra line space rel. to 'line' */
float dir; /* Direction to x axis (rad) */
float slant; /* Character slant (tan angle) */
int font; /* Active Font number */
int stdfont; /* Designated tandard font number */
int altfont; /* Designated alternate font number */
int orig; /* Label origin code */
/**
** Internally needed for character resizing and positioning
**
** T = matrix, mapping (relative) sprite coordinates into norm coord.,
** chardiff & linediff are used to advance the graphical text cursor,
** pref is a pointer to the current text reference point (origin):
**/
double Txx,Txy,Tyx,Tyy; /* Transformation matrix */
HPGL_Pt chardiff, /* Horiz. distance between characters */
linediff, /* Vertical distance between characters */
refpoint, /* Current reference point */
CR_point, /* Returns point after a <CR> */
offset; /* Needed for HP-GL command ``LO;'' */
}
TEXTPAR, *TextPar;
typedef enum {LB_direct, LB_buffered, LB_buffered_in_use}
LB_Mode; /* LB and PB work differently ! */
/**
** Remnant of former BGI font support by project plib,
** currently inactive. Leave it here in case of a future revival
**/
#ifdef STROKED_FONTS
typedef struct {
unsigned int buff[16000]; /* Buffer for font data */
unsigned int vector_off; /* Offset of start of plot data */
unsigned int size_off; /* Offset of size tab */
unsigned int first; /* ASCII code of first character*/
unsigned int num; /* Number of defined character */
unsigned int height;
unsigned int depth;
char *name;
}
FONT, *Font;
#endif
/**
** Prototypes:
**/
#ifdef __cplusplus
extern "C" {
#endif
/* void code_to_ucoord (char, HPGL_Pt *); */
int init_font (int);
void init_text_par (void);
void adjust_text_par (void);
/* void ASCII_to_char (int);*/
void plot_string (char *, LB_Mode);
void plot_symbol_char(char);
#ifdef __cplusplus
}
#endif
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