SVG Canvas

Ruby
1

I’ve been looking for a couple of days now and I can’t find a library
for svg graphics with a canvas object so I can make a financial
charting application(stand alone, not web based), is there such a
thing? maybe I’m missing something obvious.
Best regards,
Steven

2

Steven Quinones-Colon wrote:

I’ve been looking for a couple of days now and I can’t find a library
for svg graphics with a canvas object so I can make a financial
charting application(stand alone, not web based), is there such a
thing? maybe I’m missing something obvious.

Most of the available GUI libraries support graphics. I have been using
the
Qt library for this sort of thing, and the graphics are quite
acceptable:

http://localhost/ruby/graphinity/index.html

http://localhost/ruby/gravity/index.html

I have only used the Qt library, there are several others, most of them
offer this sort of graphic library. It’s not necessary to create a GUI
in
order to use the graphic libraries they offer.

If you were planning to create a GUI to go along with your graphic
images,
then this approach makes even more sense.

3

On 12/13/06, Paul L. [email protected] wrote:

Steven Quinones-Colon wrote:

I’ve been looking for a couple of days now and I can’t find a library
for svg graphics with a canvas object so I can make a financial
charting application(stand alone, not web based), is there such a
thing? maybe I’m missing something obvious.

Most of the available GUI libraries support graphics. I have been using the
Qt library for this sort of thing, and the graphics are quite acceptable:
[snip]

4

On Dec 13, 2006, at 6:33 PM, Steven Quinones-Colon wrote:

maybe I’m missing something obvious.
RMagick 1.15.0: RVG Tutorial

5

Simon S. wrote:

acceptable:
[snip]

http://www.arachnoid.com/ruby/graphinity/index.html
* Modeling Gravity with Ruby

Thank you – I managed to overlook the URL content as I collected the
data
locally.

6

On 14/12/2006, at 4:33 AM, Steven Quinones-Colon wrote:

I’ve been looking for a couple of days now and I can’t find a library
for svg graphics with a canvas object so I can make a financial
charting application(stand alone, not web based), is there such a
thing? maybe I’m missing something obvious.
Best regards,
Steven

I haven’t tried it at all, but there are Ruby bindings for the Cairo
library (http://cairographics.org/rcairo) which should produce really
nice output.

Cheers,

Pete Y.

7

Hi,

In [email protected]
“SVG Canvas” on Thu, 14 Dec 2006 02:33:44 +0900,
“Steven Quinones-Colon” [email protected] wrote:

I’ve been looking for a couple of days now and I can’t find a library
for svg graphics with a canvas object so I can make a financial
charting application(stand alone, not web based), is there such a
thing? maybe I’m missing something obvious.

If you want to only show SVG, the following example will
help you:

CVS Info for project ruby-gnome2

If you want to output your chart to screen and SVG file, the
following small script will help you:

====
#!/usr/bin/env ruby

require ‘gtk2’
require ‘rsvg2’

def draw(context, width, height)
context.move_to(0, 0)
context.line_to(width, height)
context.stroke

context.move_to(width, 0)
context.line_to(0, height)
context.stroke
end

window = Gtk::Window.new
window.set_default_size(300, 300)
vbox = Gtk::VBox.new
area = Gtk::DrawingArea.new
save = Gtk::Button.new(“save”)

window.signal_connect(“destroy”) do
Gtk.main_quit
end

area.signal_connect(“expose_event”) do |widget, event|
width, height = area.window.size
context = widget.window.create_cairo_context
draw(context, width, height)
true
end

save.signal_connect(“clicked”) do |widget, event|
width, height = area.window.size
surface = Cairo::SVGSurface.new(“output.svg”, width, height)
context = Cairo::Context.new(surface)
draw(context, width, height)
context.show_page
surface.finish
true
end

vbox.pack_start(area, true, true)
vbox.pack_end(save, false, false)
window.add(vbox)
window.show_all

Gtk.main

Thanks,

8

Thanks, I’ll try these.
Steven