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EnigmA Amiga Run 1995 November
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EnigmA AMIGA RUN 02 (1995)(G.R. Edizioni)(IT)[!][issue 1995-11][Skylink CD].iso
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xfig_doc.lha
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FORMAT3.1
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1995-08-22
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/*
* FIG : Facility for Interactive Generation of figures
* Copyright (c) 1985 by Supoj Sutanthavibul
* Parts Copyright (c) 1994 by Brian V. Smith
* Parts Copyright (c) 1991 by Paul King
*
* The X Consortium, and any party obtaining a copy of these files from
* the X Consortium, directly or indirectly, is granted, free of charge, a
* full and unrestricted irrevocable, world-wide, paid up, royalty-free,
* nonexclusive right and license to deal in this software and
* documentation files (the "Software"), including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons who receive
* copies from any such party to do so, with the only requirement being
* that this copyright notice remain intact. This license includes without
* limitation a license to do the foregoing actions under any patents of
* the party supplying this software to the X Consortium.
*/
The only difference from version 3.0 to version 3.1 is that the position
of the "magnet" has been shifted by 14 Fig units.
In the 2.1 and older versions of xfig the grid was in multiples of 5 Fig
units, but they were on intervals 4, 9, 14, 19, etc.
When version 3.0 was created, coordinates were simply multiplied by the
ratio of the resolutions (1200/80 = 15) so values like 4 became 60 instead
of 74 ((4+1)*15 - 1).
This means that figures converted from 2.1 and older files are offset by
14 Fig units but new objects entered with version 3.0 are correct.
In version 3.1 the magnet grid is at intervals 0, 75, 150, etc instead of
-1, 74, 149, etc.
Figures from 2.1 and older are correctly converted now and a warning is popped
up when you read in a version 3.0 file that says you may have to offset the
figure when you load it, using the x and y offsets in the file panel.
--------------------------------------------------------------------------------
Description of the Fig Format Follows
--------------------------------------------------------------------------------
(1) The very first line is a comment line containing the name and version:
#FIG 3.1
The character # at the first column of a line indicates that the line
is a comment line which will be ignored.
(2) The first non-comment line consists of two numbers and two strings:
int fig_resolution (Fig units/inch)
string orientation ("Landscape" or "Portrait")
string justification ("Center" or "Flush Left")
string units ("Metric" or "Inches")
int coordinate_system (1: origin is the lower left corner (NOT USED)
2: upper left)
Fig_resolution is the resolution of the figure in the file.
Xfig will always write the file with a resolution of 1200ppi so it
will scale the figure upon reading it in if its resolution is different
from 1200ppi. Pixels are assumed to be square.
Xfig will read the orientation string and change the canvas to match
either the Landscape or Portrait mode of the figure file.
The units specification is self-explanatory.
The coordinate_system variable is ignored - the origin is ALWAYS the
upper-left corner.
** Coordinates are given in "fig_resolution" units.
** Line thicknesses are given in 1/80 of an inch ("display units"). The
minimum line thickness is 0 (no line is drawn) and the maximum is 500.
** dash-lengths/dot-gaps are given in 1/80 of an inch.
(3) The rest of the file contains various objects. An object can be one
of six classes (or types).
0) Color pseudo-object.
1) Arc.
2) Ellipse which is a generalization of circle.
3) Polyline which includes polygon and box.
4) Spline which includes closed/open control/interpolated spline.
5) Text.
6) Compound object which is composed of one or more objects.
In the following elaboration on object formats, every value of Fig
output are separated by blank characters or new line ('\n'). The
value of the unused parameters will be -1.
Some fields are described as "enumeration type" or "bit vector"; the
values which these fields can take are defined in the header file object.h.
The pen_style field is unused.
These values may be defined in some future version of Fig.
The two color fields (pen and fill; pen only, for texts) are
defined as follows:
-1 = Default
0 = Black
1 = Blue
2 = Green
3 = Cyan
4 = Red
5 = Magenta
6 = Yellow
7 = White
8-11 = four shades of blue (dark to lighter)
12-14 = three shades of green (dark to lighter)
15-17 = three shades of cyan (dark to lighter)
18-20 = three shades of red (dark to lighter)
21-23 = three shades of magenta (dark to lighter)
24-26 = three shades of brown (dark to lighter)
27-30 = four shades of pink (dark to lighter)
31 = Gold
values from 32 to 543 (512 total) are user colors and
are defined in color pseudo-objects (type 0)
For WHITE color, the area fill field is defined as follows:
-1 = not filled
0 = black
... values from 1 to 19 are shades of grey, from darker to lighter
20 = white
21-40 not used
41-56 see patterns for colors, below
For BLACK or DEFAULT color, the area fill field is defined as follows:
-1 = not filled
0 = white
... values from 1 to 19 are shades of grey, from lighter to darker
20 = black
21-40 not used
41-56 see patterns for colors, below
For all other colors, the area fill field is defined as follows:
-1 = not filled
0 = black
... values from 1 to 19 are "shades" of the color, from darker to lighter.
A shade is defined as the color mixed with black
20 = full saturation of the color
... values from 21 to 39 are "tints" of the color from the color to white.
A tint is defined as the color mixed with white
40 = white
41 = 30 degree left diagonal pattern
42 = 30 degree right diagonal pattern
43 = 30 degree crosshatch
44 = 45 degree left diagonal pattern
45 = 45 degree right diagonal pattern
46 = 45 degree crosshatch
47 = bricks
48 = circles
49 = horizontal lines
50 = vertical lines
51 = crosshatch
52 = fish scales
53 = small fish scales
54 = octagons
55 = horizontal "tire treads"
56 = vertical "tire treads"
The depth field is defined as follows:
0 ... 999 where larger value means object is deeper than (under)
objects with smaller depth
The line_style field is defined as follows:
-1 = Default
0 = Solid
1 = Dashed
2 = Dotted
The style_val field is defined as the length, in 1/80 inches, of the on/off
dashes for dashed lines, and the distance between the dots, in 1/80 inches,
for dotted lines.
The join_style field is defined FOR LINES only as follows:
0 = Miter (the default in xfig 2.1 and earlier)
1 = Bevel
2 = Round
The cap_style field is defined FOR LINES, OPEN SPLINES and ARCS only as follows:
0 = Butt (the default in xfig 2.1 and earlier)
1 = Round
2 = Projecting
The arrow_type field is defined for LINES, ARCS and OPEN SPLINES
only as follows:
0 = Stick-type (the default in xfig 2.1 and earlier)
1 = Closed triangle:
|\
| \
| \
| /
| /
|/
2 = Closed with "indented" butt:
|\
\ \
\ \
\ \
/ /
/ /
/ /
|/
3 = Closed with "pointed" butt:
|\
/ \
/ \
/ \
\ /
\ /
\ /
|/
The arrow_style field is defined for LINES, ARCS and OPEN SPLINES
only as follows:
0 = Hollow (actually filled with white)
1 = Filled with pen_color
(3.0) OBJECT DEFINITION:
(3.1) Color Pseudo-objects (user-defined colors)
This is used to define arbitrary colors beyond the 32 standard colors.
The color objects must be defined before any other Fig objects.
First line:
type name (brief description)
---- ---- -------------------
int object_code (always 0)
int color_number (color number, from 32-543 (512 total))
hex string rgb values (hexadecimal string describing red,
green and blue values (e.g. #330099) )
(3.2) ARC
First line:
type name (brief description)
---- ---- -------------------
int object_code (always 5)
int sub_type (0: pie-wedge (closed)
1: open ended arc)
int line_style (enumeration type)
int line_thickness (1/80 inch)
int pen_color (enumeration type, pen color)
int fill_color (enumeration type, fill color)
int depth (enumeration type)
int pen_style (pen style, not used)
int area_fill (enumeration type, -1 = no fill)
float style_val (1/80 inch)
int cap_style (enumeration type)
int direction (0: clockwise, 1: counterclockwise)
int forward_arrow (0: no forward arrow, 1: on)
int backward_arrow (0: no forward arrow, 1: on)
float center_x, center_y (center of the arc)
int x1, y1 (Fig units, the 1st point the user entered)
int x2, y2 (Fig units, the 2nd point)
int x3, y3 (Fig units, the last point)
Forward arrow line (Optional; absent if forward_arrow is 0):
type name (brief description)
---- ---- -------------------
int arrow_type (enumeration type)
int arrow_style (enumeration type)
float arrow_thickness (1/80 inch)
float arrow_width (Fig units)
float arrow_height (Fig units)
Backward arrow line (Optional; absent if backward_arrow is 0):
type name (brief description)
---- ---- -------------------
int arrow_type (enumeration type)
int arrow_style (enumeration type)
float arrow_thickness (1/80 inch)
float arrow_width (Fig units)
float arrow_height (Fig units)
(3.3) COMPOUND
A line with object code 6 signifies the start of a compound.
There are four more numbers on this line which indicate the
upper right corner and the lower left corner of the bounding
box of this compound. A line with object code -6 signifies
the end of the compound. Compound may be nested.
First line:
type name (brief description)
---- ---- -------------------
int object_code (always 6)
int upperright_corner_x (Fig units)
int upperright_corner_y (Fig units)
int lowerleft_corner_x (Fig units)
int lowerleft_corner_y (Fig units)
Subsequent lines:
objects
.
.
Last line:
-6
(3.4) ELLIPSE
First line:
type name (brief description)
---- ---- -------------------
int object_code (always 1)
int sub_type (1: ellipse defined by radiuses
2: ellipse defined by diameters
3: circle defined by radius
4: circle defined by diameter)
int line_style (enumeration type)
int thickness (1/80 inch)
int pen_color (enumeration type, pen color)
int fill_color (enumeration type, fill color)
int depth (enumeration type)
int pen_style (pen style, not used)
int area_fill (enumeration type, -1 = no fill)
float style_val (1/80 inch)
int direction (always 1)
float angle (radians, the angle of the x-axis)
int center_x, center_y (Fig units)
int radius_x, radius_y (Fig units)
int start_x, start_y (Fig units; the 1st point entered)
int end_x, end_y (Fig units; the last point entered)
(3.5) POLYLINE
First line:
type name (brief description)
---- ---- -------------------
int object_code (always 2)
int sub_type (1: polyline
2: box
3: polygon
4: arc-box)
5: imported-picture bounding-box)
int line_style (enumeration type)
int thickness (1/80 inch)
int pen_color (enumeration type, pen color)
int fill_color (enumeration type, fill color)
int depth (enumeration type)
int pen_style (pen style, not used)
int area_fill (enumeration type, -1 = no fill)
float style_val (1/80 inch)
int join_style (enumeration type)
int cap_style (enumeration type, only used for POLYLINE)
int radius (1/80 inch, radius of arc-boxes)
int forward_arrow (0: off, 1: on)
int backward_arrow (0: off, 1: on)
int npoints (number of points in line)
Forward arrow line: same as ARC object
Backward arrow line: same as ARC object
Points line:
type name (brief description)
---- ---- -------------------
int x1, y1 (Fig units)
int x2, y2 (Fig units)
.
.
int xnpoints ynpoints (this will be the same as the 1st
point for polygon and box)
PIC line:
type name (brief description)
---- ---- -------------------
boolean flipped orientation = normal (0) or flipped (1)
char file[] name of picture file to import
(3.6) SPLINE
First line:
type name (brief description)
---- ---- -------------------
int object_code (always 3)
int sub_type (0: open spline
1: closed spline
2: open interpolated spline
3: closed interpolated spline)
int line_style (See the end of this section)
int thickness (1/80 inch)
int pen_color (enumeration type, pen color)
int fill_color (enumeration type, fill color)
int depth (enumeration type)
int pen_style (pen style, not used)
int area_fill (enumeration type, -1 = no fill)
float style_val (1/80 inch)
int cap_style (enumeration type, only used for open splines)
int forward_arrow (0: off, 1: on)
int backward_arrow (0: off, 1: on)
int npoints (number of control points in spline)
Forward arrow line: same as ARC object
Backward arrow line: same as ARC object
Points line: same as POLYLINE object
Control points line (absent if sub_type is 0 or 1):
Control points of interpolated spline. There are two control
points for each knots. A section i, of the spline is drawn
using Bezier cubic with the following four points:
(x ,y ), (rx ,ry ), (lx , ly ), (x , y ).
i i i i i+1 i+1 i+1 i+1
For closed interpolated spline the last pair of control points,
(lxnpoints,lynpoints) and (rxnpoints,rynpoints) (which can be ignored),
are the same as (lx1,ly1) and (rx1,ry1) respectively.
type name (brief description)
---- ---- -------------------
float lx1, ly1 (Fig units)
float rx1, ry1 (Fig units)
float lx2, ly2 (Fig units)
float rx2, ry2 (Fig units)
.
.
float lxnpoints, lynpoints (Fig units)
float rxnpoints, rynpoints (Fig units)
(3.7) TEXT
type name (brief description)
---- ---- -------------------
int object (always 4)
int sub_type (0: Left justified
1: Center justified
2: Right justified)
int color (enumeration type)
int depth (enumeration type)
int pen_style (enumeration , not used)
int font (enumeration type)
float font_size (font size in points)
float angle (radians, the angle of the text)
int font_flags (bit vector)
float height (Fig units)
float length (Fig units)
int x, y (Fig units, coordinate of the origin
of the string. If sub_type = 0, it is
the lower left corner of the string.
If sub_type = 1, it is the lower
center. Otherwise it is the lower
right corner of the string.)
char string[] (ASCII characters; starts after a blank
character following the last number and
ends before the sequence '\001'. This
sequence is not part of the string.
Characters above octal 177 are
represented by \xxx where xxx is the
octal value. This permits Fig files to
be edited with 7-bit editors and sent
by e-mail without data loss.
Note that the string may contain '\n'.)
The font_flags field is defined as follows:
Bit Description
0 Rigid text (text doesn't scale when scaling compound objects)
1 Special text (for LaTeX)
2 PostScript font (otherwise LaTeX font is used)
3 Hidden text
The font field is defined as follows:
For font_flags bit 2 = 0 (LaTeX fonts):
0 Default font
1 Roman
2 Bold
3 Italic
4 Sans Serif
5 Typewriter
For font_flags bit 3 = 1 (PostScript fonts):
-1 Default font
0 Times Roman
1 Times Italic
2 Times Bold
3 Times Bold Italic
4 AvantGarde Book
5 AvantGarde Book Oblique
6 AvantGarde Demi
7 AvantGarde Demi Oblique
8 Bookman Light
9 Bookman Light Italic
10 Bookman Demi
11 Bookman Demi Italic
12 Courier
13 Courier Oblique
14 Courier Bold
15 Courier Bold Oblique
16 Helvetica
17 Helvetica Oblique
18 Helvetica Bold
19 Helvetica Bold Oblique
20 Helvetica Narrow
21 Helvetica Narrow Oblique
22 Helvetica Narrow Bold
23 Helvetica Narrow Bold Oblique
24 New Century Schoolbook Roman
25 New Century Schoolbook Italic
26 New Century Schoolbook Bold
27 New Century Schoolbook Bold Italic
28 Palatino Roman
29 Palatino Italic
30 Palatino Bold
31 Palatino Bold Italic
32 Symbol
33 Zapf Chancery Medium Italic
34 Zapf Dingbats
