Hello,
What would be the best choice for 2d vector graphics with ruby?
My needs are as follows:
2D vector (SVG/ pdf/ postscript like), Animation, Offscreen rendering.
I think i’ll use openGL, but I’d rather use a pure 2D oriented library.
I’ve searched raa, but could not find anything like that.
Is there any 2D vector lib I should know about, or is opengl my only
option? (as long as i want to use ruby)
Regards Alwin.
I can recommend RMagic.
http://rmagick.rubyforge.org/
Don’t know about animation though.
You may see what I have made using RMagick, here:
http://aeditor.rubyforge.org/softwrap.html
On Sun, 01 Feb 2004 02:12:43 +0900, Alwin Blok wrote:
Hello,
What would be the best choice for 2d vector graphics with ruby?
My needs are as follows:
2D vector (SVG/ pdf/ postscript like), Animation, Offscreen rendering.
–
Simon Strandgaard
Alwin Blok alwinblok@fakevirus.net wrote in message news:279FDE5D-5410-11D8-9F89-003065C833A2@fakevirus.net…
Hello,
What would be the best choice for 2d vector graphics with ruby?
My needs are as follows:
2D vector (SVG/ pdf/ postscript like), Animation, Offscreen rendering.I think i’ll use openGL, but I’d rather use a pure 2D oriented library.
I’ve searched raa, but could not find anything like that.
Is there any 2D vector lib I should know about, or is opengl my only
option? (as long as i want to use ruby)Regards Alwin.
libplot from the gnu plotutils project could be a good choice for you.
There are ruby bindings here, but i dont known how complete they are.
http://raa.ruby-lang.org/list.rhtml?name=ruby-libplot
Ciao
Denis
Simon Strandgaard wrote:
Hello,
What would be the best choice for 2d vector graphics with ruby?
My needs are as follows:
2D vector (SVG/ pdf/ postscript like), Animation, Offscreen rendering.I can recommend RMagic.
http://rmagick.rubyforge.org/Don’t know about animation though.
You may see what I have made using RMagick, here:
http://aeditor.rubyforge.org/softwrap.html–
Simon Strandgaard
I have used RMagic in the past, but it doesn’t quite seem suited to per
pixel editing. I was trying to do an AI project of RedEye detection for
a class, and I did succeed to use it but I had to add a couple methods
to more easily edit individual pixels. It just didn’t seem to be really
set up to do per pixel calculations or modifications very nicely. I was
curious if anyone else has suggestions on what would be most
appropriate for that?
Charles Comstock
On Sun, 01 Feb 2004 02:12:43 +0900, Alwin Blok wrote:
On Sun, 01 Feb 2004 02:12:43 +0900, Alwin Blok wrote:
Hello,
What would be the best choice for 2d vector graphics with ruby?
My needs are as follows:
2D vector (SVG/ pdf/ postscript like), Animation, Offscreen rendering.I can recommend RMagic.
http://rmagick.rubyforge.org/Don’t know about animation though.
Not exactly what was asked for, but ruby-ming is a cracking Flash
library if you want vector animation:
http://madscientist.jp/~ikegami/ruby/ming/
–
Mencken and Nathan’s Fifteenth Law of The Average American:
The worst actress in the company is always the manager’s wife.
Rasputin :: Jack of All Trades - Master of Nuns
It’s possible with RMagick… get/set pixel methods 
http://www.simplesystems.org/RMagick/doc/image.html#Image.get_pixels
On Sun, 01 Feb 2004 16:18:50 -0600, Charles Comstock wrote:
Simon Strandgaard wrote:
On Sun, 01 Feb 2004 02:12:43 +0900, Alwin Blok wrote:
Hello,
What would be the best choice for 2d vector graphics with ruby?
My needs are as follows:
2D vector (SVG/ pdf/ postscript like), Animation, Offscreen rendering.I can recommend RMagic.
http://rmagick.rubyforge.org/Don’t know about animation though.
You may see what I have made using RMagick, here:
http://aeditor.rubyforge.org/softwrap.html–
Simon StrandgaardI have used RMagic in the past, but it doesn’t quite seem suited to per
pixel editing. I was trying to do an AI project of RedEye detection for
a class, and I did succeed to use it but I had to add a couple methods
to more easily edit individual pixels. It just didn’t seem to be really
set up to do per pixel calculations or modifications very nicely. I was
curious if anyone else has suggestions on what would be most
appropriate for that?
–
Simon Strandgaard
Simon Strandgaard wrote:
Simon Strandgaard wrote:
Hello,
What would be the best choice for 2d vector graphics with ruby?
My needs are as follows:
2D vector (SVG/ pdf/ postscript like), Animation, Offscreen rendering.I can recommend RMagic.
http://rmagick.rubyforge.org/Don’t know about animation though.
You may see what I have made using RMagick, here:
http://aeditor.rubyforge.org/softwrap.html–
Simon StrandgaardI have used RMagic in the past, but it doesn’t quite seem suited to per
pixel editing. I was trying to do an AI project of RedEye detection for
a class, and I did succeed to use it but I had to add a couple methods
to more easily edit individual pixels. It just didn’t seem to be really
set up to do per pixel calculations or modifications very nicely. I was
curious if anyone else has suggestions on what would be most
appropriate for that?It’s possible with RMagick… get/set pixel methods
http://www.simplesystems.org/RMagick/doc/image.html#Image.get_pixels–
Simon Strandgaard
Right I have used that function it’s just very cumbersome, it would be
much easier to directly edit the values in the real array they are in.
Exporting a pixel array is really not a very efficient operation, not to
mention the need to reimport them later. Not to mention the fact it
returns a flat array which while it’s easy to write an accessor that
2d’s it, it still is not particularly friendly towards doing image analysis.
Charlie
On Sun, 01 Feb 2004 16:18:50 -0600, Charles Comstock wrote:
On Sun, 01 Feb 2004 02:12:43 +0900, Alwin Blok wrote:
Charles Comstock wrote:
I have used RMagic in the past, but it doesn’t quite seem suited to
per pixel editing. I was trying to do an AI project of RedEye
detection for a class, and I did succeed to use it but I had to add
a couple methods to more easily edit individual pixels. It just
didn’t seem to be really set up to do per pixel calculations or
modifications very nicely. I was curious if anyone else has
suggestions on what would be most appropriate for that?It’s possible with RMagick… get/set pixel methods
http://www.simplesystems.org/RMagick/doc/image.html#Image.get_pixelsRight I have used that function it’s just very cumbersome, it would be
much easier to directly edit the values in the real array they are in.
Exporting a pixel array is really not a very efficient operation, not to
mention the need to reimport them later. Not to mention the fact it
returns a flat array which while it’s easy to write an accessor that
2d’s it, it still is not particularly friendly towards doing image
analysis.
Tell that to Tim. I’m sure he’ll consider adding to the API if you
make a strong case for it.
Hal
i’m in total agreement. what i have done is to create a class the memory maps
images using guy’s mmap module in ‘r+’ mode (read/write) and created a class
that ‘2ds’ the pixel indexes - using this i have written some ruby programs
which run faster that some of our C programs (due to stupid i/o ops). if you
really are doing pixel level operations i’d consider this approach.
-a
On Mon, 2 Feb 2004, Charles Comstock wrote:
Date: Mon, 02 Feb 2004 18:27:32 -0600
From: Charles Comstock cc1@cec.wustl.edu
Newsgroups: comp.lang.ruby
Subject: Re: graphics lib?Simon Strandgaard wrote:
On Sun, 01 Feb 2004 16:18:50 -0600, Charles Comstock wrote:
Simon Strandgaard wrote:
On Sun, 01 Feb 2004 02:12:43 +0900, Alwin Blok wrote:
Hello,
What would be the best choice for 2d vector graphics with ruby?
My needs are as follows:
2D vector (SVG/ pdf/ postscript like), Animation, Offscreen rendering.I can recommend RMagic.
http://rmagick.rubyforge.org/Don’t know about animation though.
You may see what I have made using RMagick, here:
http://aeditor.rubyforge.org/softwrap.html–
Simon StrandgaardI have used RMagic in the past, but it doesn’t quite seem suited to per
pixel editing. I was trying to do an AI project of RedEye detection for
a class, and I did succeed to use it but I had to add a couple methods
to more easily edit individual pixels. It just didn’t seem to be really
set up to do per pixel calculations or modifications very nicely. I was
curious if anyone else has suggestions on what would be most
appropriate for that?It’s possible with RMagick… get/set pixel methods
http://www.simplesystems.org/RMagick/doc/image.html#Image.get_pixels–
Simon StrandgaardRight I have used that function it’s just very cumbersome, it would be
much easier to directly edit the values in the real array they are in.
Exporting a pixel array is really not a very efficient operation, not to
mention the need to reimport them later. Not to mention the fact it
returns a flat array which while it’s easy to write an accessor that
2d’s it, it still is not particularly friendly towards doing image analysis.Charlie
–
ATTN: please update your address books with address below!
===============================================================================
EMAIL :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
PHONE :: 303.497.6469
ADDRESS :: E/GC2 325 Broadway, Boulder, CO 80305-3328
STP :: Solar-Terrestrial Physics Data | NCEI
NGDC :: http://www.ngdc.noaa.gov/
NESDIS :: http://www.nesdis.noaa.gov/
NOAA :: http://www.noaa.gov/
US DOC :: http://www.commerce.gov/The difference between art and science is that science is what we
understand well enough to explain to a computer.
Art is everything else.
– Donald Knuth, “Discover”/bin/sh -c ‘for l in ruby perl;do $l -e “print "\x3a\x2d\x29\x0a"”;done’
===============================================================================
Ara.T.Howard wrote:
On Mon, 2 Feb 2004, Charles Comstock wrote:
Date: Mon, 02 Feb 2004 18:27:32 -0600
From: Charles Comstock cc1@cec.wustl.edu
Newsgroups: comp.lang.ruby
Subject: Re: graphics lib?Simon Strandgaard wrote:
On Sun, 01 Feb 2004 16:18:50 -0600, Charles Comstock wrote:
Simon Strandgaard wrote:
On Sun, 01 Feb 2004 02:12:43 +0900, Alwin Blok wrote:
Hello,
What would be the best choice for 2d vector graphics with ruby?
My needs are as follows:
2D vector (SVG/ pdf/ postscript like), Animation, Offscreen rendering.I can recommend RMagic.
http://rmagick.rubyforge.org/Don’t know about animation though.
You may see what I have made using RMagick, here:
http://aeditor.rubyforge.org/softwrap.html–
Simon StrandgaardI have used RMagic in the past, but it doesn’t quite seem suited to per
pixel editing. I was trying to do an AI project of RedEye detection for
a class, and I did succeed to use it but I had to add a couple methods
to more easily edit individual pixels. It just didn’t seem to be really
set up to do per pixel calculations or modifications very nicely. I was
curious if anyone else has suggestions on what would be most
appropriate for that?It’s possible with RMagick… get/set pixel methods
http://www.simplesystems.org/RMagick/doc/image.html#Image.get_pixels–
Simon StrandgaardRight I have used that function it’s just very cumbersome, it would be
much easier to directly edit the values in the real array they are in.
Exporting a pixel array is really not a very efficient operation, not to
mention the need to reimport them later. Not to mention the fact it
returns a flat array which while it’s easy to write an accessor that
2d’s it, it still is not particularly friendly towards doing image analysis.Charlie
i’m in total agreement. what i have done is to create a class the memory maps
images using guy’s mmap module in ‘r+’ mode (read/write) and created a class
that ‘2ds’ the pixel indexes - using this i have written some ruby programs
which run faster that some of our C programs (due to stupid i/o ops). if you
really are doing pixel level operations i’d consider this approach.-a
You don’t happen to have some code for example of this? I’m not quite
following is this through a C extension or just raw ruby? My solution I
did last time was wrap the get/set pixel methods so they only grabbed
a 1x1 range, and then I could access them directly, but this somehow
seems like it probably incites horrible performance.
Charles Comstock
Or even a weak case
Suggestions and patches are always welcome. I’m planning a new release of
RMagick in conjunction with the upcoming release of ImageMagick 5.5.8.
On Tue, 03 Feb 2004 09:33:01 +0900, Hal Fulton wrote:
Tell that to Tim. I’m sure he’ll consider adding to the API if you make a
strong case for it.
before i reply to the above i’d also suggest checking out narray - it features
ultra fast and pretty easy to use very large array manipulation. it is a c
extension available from the raa…
re: above
yes - i have example code - and yes mmap is a c extension (written by ts). my
code is ultra specific to a statelite image format we use here at ngdc that’s
something like
number of records = 3021
number of header records = 1
number of data records = 3020
record size = 7231
…
…
…
…
…
lots_of_binary_satelite_data32409132483124083209840238402983…
409132483124083209840238402983…
409132483124083209840238402983…
i have classes for header, scanlines, scanline header, and to get at
row/pixels.
excerpt follows (contact me offline and i will send you sources); this should
give you the general flavor of what i’m talking about. below shows the idea
behind a row level ‘munging’ method (#map!) that makes use of mmap to change
pixels in place w/o really doing anything explict. pixel operations would be
similar. the speed is gained by mapping the file ‘rw’ and never hanging on to
more data than required at a time - in this case a scanline (record) of data.
require ‘mmap’
…
module DMSP
module OLS
class Header < Array
#{{{
…
…
def k
#{{{
idx = index_of k
raise IndexError, “#{ k.class } : #{ k.inspect }” unless idx
ret = super(idx)
raise IndexError, "#{ k.class } : #{ k.inspect }" unless
ret and ret.size == 2
Numeric === k ? ret : ret[1]
#}}}
end
# new
…
def = k, v
#{{{
if Numeric === k
raise TypeError, “#{ v.class } : #{ v.inspect }” unless Array === v
@modified = true
return super(k,v)
end
idx = index_of k
if idx
k = self[idx].first if Regexp === k
else
raise IndexError, "#{ k.class } : #{ k.inspect }" if Regexp === k
idx = self.size # append
end
raise TypeError, "#{ k.class } : #{ k.inspect }" unless String === k
pair = [k.strip, v]
# recurse with numeric argument!
self[idx] = pair
v
#}}}
end
…
#}}}
end # class Header
class Mmap < ::Mmap
#{{{
…
…
# methods
def initialize(*args)
#{{{
@args = DMSP::hashify(*args)
@path, @mode, @protection =
@args.values_at :path, :mode, :protection
@type = DMSP::file_type @path
@mode ||= DEFAULT_MODE
@protection ||= DEFAULT_PROTECTION
super(path, mode, protection)
@header = Header.new :io => self
self
#}}}
end
…
def get_record n
#{{{
n = n.to_i
raise(IndexError, “INDEX [%s]” % [n]) if
n < 0 or n >= number_of_records
rb = header.record_bytes
start, length = n * rb, rb
self[start, length]
#}}}
end
…
def set_record n, data
#{{{
n = n.to_i
raise(IndexError, “INDEX [%s]” % [n]) if
n < 0 or n >= number_of_records
rb = header.record_bytes
raise(RangeError, "DATA SIZE [%d]" % [data.size]) if
data.size != rb
start, length = n * rb, rb
self[start, length] = data
#}}}
end
…
def map!
#{{{
changed = false
r = header.number_of_header_records … header.number_of_records
r.each do |n|
data = yield(get_record(n))
if data
set_record(n, data)
changed = true
end
end
changed ? self : nil
#}}}
end
alias collect! map!
…
#}}}
end # class MmappedFile
end # module DMSP
i would think that, for an image, you may end up with something like
(un-tested)
class Image < Mmap
# class to support double ([i][j]) style indexing
class Row
attr :row
attr :image
def initialize row, image; @row = row; @image = image; end
def col
image[row * image.n_cols + col]
end
def = col, pixel
image[row * image.n_cols + col] = pixel
end
end
attr :n_rows
attr :n_cols
def initialize path, n_rows, n_cols
super path, 'rw', Mmap::MAP_SHARED
end
def [] row
Row.new row, self
end
def pixel i, j, pix = nil
pix ? (self[i * n_cols + j] = pix) : self[i * n_cols + j]
end
end
which would allow you to do something like
p(image.pixel i, j)
image.pixel i, j, 0b101010
p(image.pixel i, j)
or
p(image.pixel[i][j])
image.pixel[i][j] = 0b101010
p(image.pixel[i][j])
you would proably be better off using rmagick or narray. the reason i chose
this approach is that the ONLY thing i really needed was pixel level access
since we are applying our own algorithims to the pixels and installing rmagick
or narray for this was a bit overkill. mmap is lightweight and fast if all
you desire is pixel level access.
food for thought.
-a
On Mon, 2 Feb 2004, Charles Comstock wrote:
You don’t happen to have some code for example of this? I’m not quite
following is this through a C extension or just raw ruby? My solution I did
last time was wrap the get/set pixel methods so they only grabbed a 1x1
range, and then I could access them directly, but this somehow seems like it
probably incites horrible performance.
Charles Comstock
–
ATTN: please update your address books with address below!
===============================================================================
EMAIL :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
PHONE :: 303.497.6469
ADDRESS :: E/GC2 325 Broadway, Boulder, CO 80305-3328
STP :: http://www.ngdc.noaa.gov/stp/
NGDC :: http://www.ngdc.noaa.gov/
NESDIS :: http://www.nesdis.noaa.gov/
NOAA :: http://www.noaa.gov/
US DOC :: http://www.commerce.gov/The difference between art and science is that science is what we
understand well enough to explain to a computer.
Art is everything else.
– Donald Knuth, “Discover”/bin/sh -c ‘for l in ruby perl;do $l -e “print "\x3a\x2d\x29\x0a"”;done’
===============================================================================