FLY( Version 1.6.5) FLY( Version 1.6.5)
NB FOR FULL DOCUMENTATION see fly.html
USAGE
The standard manner used to invoke fly is: fly -i <input file> -o
<output file>
You can omit the input file, and fly takes its directives from stdin,
and if you omit the output file, the output goes to stdout.
Using the -q switch sets fly to quiet mode - no on-screen
reporting.
A quick reference to directives may be seen by using the -h
switch.
THE COMMAND FILE
The command file uses a number of directives. It must start with one
of the following lines:
existing /path/to/file.gif
if modifying an existing image, OR new size x,y
for creating a new image of width x pixels, height y pixels.
After the initial command, any of the commands below may be used.
To create more than one image from a command file, use the directive
end, followed by either
existing /path/to/file.gif name <filename.gif>
if modifying an existing image, OR new size x,y name
<filename.gif>
for creating a new image.
Note:
All x,y values are in pixels measured from the top left of the
image. For a 256x256 image, top left is 0,0 and
bottom right is 255,255. All x1,y1,x2,y2 pairs must specify the
top left and bottom right of the shape, where
appropriate.
All RGB colour values are in integer format, not hexadecimal.
Arc sweeps are clockwise.
DIRECTIVES AND EXPLANATIONS
line x1,y1,x2,y2,R,G,B
Creates a line from coordinates x1,y1 to coordinates x2,y2 of
colour R,G,B.
- 1 - Formatted: April 19, 2024
FLY( Version 1.6.5) FLY( Version 1.6.5)
dline x1,y1,x2,y2,R,G,B
Creates a dashed line from coordinates x1,y1 to coordinates
x2,y2 of colour R,G,B.
rect x1,y1,x2,y2,R,G,B
Creates a rectangle from coordinates x1,y1 to coordinates x2,y2
with edging of colour R,G,B.
frect x1,y1,x2,y2,R,G,B
Creates a filled rectangle from coordinates x1,y1 to coordinates
x2,y2 filled with colour R,G,B.
square x1,y1,s,R,G,B
Creates a square qith the top left corner at coordinates x1,y1,
with side s in length, with edge of colour
R,G,B.
fsquare x1,y1,s,R,G,B
Creates a square qith the top left corner at coordinates x1,y1,
with side s in length, filled with colour
R,G,B.
poly R,G,B,x1,y1...,xn,yn
Creates a polygon (has to be closed) through the points x1,y1 to
x2,y2 to ... to xn,yn, of colour R,G,B.
Note that the colour values appear before the coordinates in
this directive.
fpoly R,G,B,x1,y1...,xn,yn
Creates a polygon (has to be closed) through the points x1,y1 to
x2,y2 to ... to xn,yn, filled with colour
R,G,B.
Note that the colour values appear before the coordinates in
this directive.
arc x1,y1,w,h,start,finish,R,G,B
Creates an arc of colour R,G,B centered at coordinates x1,y1, of
width w and height h, starting at start
degrees and finishing at finish degrees.
ellipse x1,y1,w,h,R,G,B
Creates an ellipse of colour R,G,B centered at coordinates
- 2 - Formatted: April 19, 2024
FLY( Version 1.6.5) FLY( Version 1.6.5)
x1,y1, of width w and height h.
fcircle x1,y1,d,R,G,B
Creates a circle centered at coordinates x1,y1, of diameter d,
filled with colour R,G,B.
circle x1,y1,d,R,G,B
Creates a circle of colour R,G,B centered at coordinates x1,y1,
of diameter d.
fill x,y,R,G,B
Flood fills with the colour R,G,B from the coordinates x,y to
the edge of the area of the original color of
x,y.
filltoborder x,y,R1,G1,B1,R2,B2,G2
Flood fills with colour R2,G2,B2 from x,y to the border of
colour R1,G1,B1.
string R,G,B,x,y,<size>,<string>
Writes a string starting at x,y (in the colour R,G,B), of font
size <size>, where size can be one of tiny
(5x8), small (6x12), medium (7x13, bold), large (8x16) or giant
(9x15, bold).
stringup R,G,B,x,y,<size>,<string>
Writes a string vertically starting at x,y (in the colour
R,G,B), of font size <size>, where size can be one of
tiny, small, medium, large or giant. The string will go up from
the coordinates supplied.
copy x,y,x1,y1,x2,y2,[source-filename.gif|`command`]
Copies region x1,y1 - x2,y2 of source-filename.gif or the GIF
output of command to the coordinates x,y
of the image being created/modified.
If x1,y1,x2,y2 are all -1, copy the entire image.
copyresized x1,y1,x2,y2,dx1,dy1,dx2,dy2,[source-
filename.gif|`command`]
Copies region x1,y1 - x2,y2 of source-filename.gif or the GIF
output of command to the area dx1,dy1 -
dx2,dy2 of the image being created/modified, resizing the image
to fit.
- 3 - Formatted: April 19, 2024
FLY( Version 1.6.5) FLY( Version 1.6.5)
If x1,y1,x2,y2 are all -1, copy the entire image.
getpixel x,y
Gets the colour index of the point at x,y.
setpixel x,y,R,G,B
Sets the point at x,y to the colour R,G,B.
colourchange R1,G1,B1,R2,G2,B2
Changes all pixels of colour R1,G1,B1 to R2,G2,B2.
setbrush filename.gif
Sets the current "brush" to filename.gif. Subsequent directives
of line, dline, rect, poly and arc will use the
selected "brush" to draw their lines, until a call of killbrush.
killbrush
Turns off the brush selection. Calls to line, dline, rect, poly
and arc will then use the standard single-pixel
width brush.
settile filename.gif
Sets the current "tile" to filename.gif. Subsequent directives
of fill, and fpoly will use the selected "tile" as
a fill pattern, until a call of killtile.
killtile
Turns off the tile selection. Calls to fill, filltoborder and
fpoly will then use the specified colour for fills.
setstyle R1,G1,B1, R2, G2, B2, ..., Rn,Gn,Bn
Various line calls can use a style, specified by one or more
colour settings for each pixel, that is repeated for
the length of the "line". All subsequent directives of line,
dline, rect, poly and arc will use the selected "style"
to draw their lines, until a call of killstyle.
killstyle
Turns off the style selection. Calls to line, dline, rect, poly
and arc will then use the standard single-pixel
width brush.
- 4 - Formatted: April 19, 2024
FLY( Version 1.6.5) FLY( Version 1.6.5)
transparent R,G,B
Makes the colour R,G,B the transparent colour.
sizex
Returns the width of the image in pixels.
sizey
Returns the height of the image in pixels.
rotate deg
Rotates the GIF image deg degrees clockwise, where deg is 90,
180 or 270.
interlace
Makes the image output by fly an interlaced GIF.
Comments in the command file
At any point in the command file, you can insert a comment line
starting with "#".
Example:
new size 256,256 # # start with a background fill fill 1,1,255,255,255
# # then a circle in the middle circle 128,128,180,0,0,0 # etc.
EXAMPLES
If you are using fly from within a CGI program, here are some
examples:
Perl
#!/usr/local/bin/perl
$flyprog = "/usr/local/bin/fly";
$outfile = "temp.gif";
open(FLY,"| $flyprog -o $outfile ");
print FLY "new0;
print FLY "size 256,2560;
print FLY "fill 1,1,255,255,2550;
- 5 - Formatted: April 19, 2024
FLY( Version 1.6.5) FLY( Version 1.6.5)
print FLY "circle 128,128,180,0,0,00;
print FLY "fill 128,128,255,255,00;
print FLY "arc 128,128,120,120,0,180,0,0,00;
print FLY "circle 96,96,10,0,0,00;
print FLY "circle 160,96,10,0,0,00;
print FLY "fill 96,96,0,0,00;
print FLY "fill 160,96,0,0,00;
close(FLY);
csh
#!/bin/csh
# test out fly!
cat > /tmp/fly.$$ <<EOD
new
size 256,256
fill 1,1,255,255,255
circle 128,128,180,0,0,0
fill 128,128,255,255,0
arc 128,128,120,120,0,180,0,0,0
circle 96,96,10,0,0,0
circle 160,96,10,0,0,0
fill 96,96,0,0,0
fill 160,96,0,0,0
EOD
fly -i /tmp/fly.$$ -o test.gif
Fly Scripts
You can even create your own fly "scripts"!
#!/usr/local/bin/fly -q
new
size 256,256
fill 1,1,255,255,255
<etc>
Thanks to Andrew Finkenstadt <andyf@simutronics.com> for noting
this unintentional feature of fly.
C
If you're using C, then you might as well use gd!!
Can you guess what the above examples produce? Here's the answer!
Feedback
- 6 - Formatted: April 19, 2024
FLY( Version 1.6.5) FLY( Version 1.6.5)
Let me know if you're using fly - send email to
gleeson@unimelb.edu.au.
- 7 - Formatted: April 19, 2024
