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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I need to compute the size and coordinates for a bounding box for a <g> subtree in an SVG image (well, actually I just need the box center), identified by a specific attribute. It’s easy to do in a web browser (a little DOM traversal, then
a <span style="font-size:8.0pt;font-family:"Lucida Console"">getBoundingClientRect()</span> call), but I need to do it server-side. It looks to me like Cairo library might be able to do that, but it also looks fairly complicated, and I just need to perform
that one specific task.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am using the Ruby bindings for Cairo, together with SVG. Any suggestions on how to locate a given node by attribute (without the convenience of jQuery), and then to compute its bounding rectangle?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am currently loading SVG into a Cairo surface as follows:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Lucida Console"">@rsvgHandle = RSVG::Handle.new_from_file(@baseFile)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Lucida Console"">dim = @rsvgHandle.dimensions<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Lucida Console"">@width = dim.width<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Lucida Console"">@height = dim.height<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Lucida Console""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Lucida Console"">surface = Cairo::ImageSurface.new(Cairo::FORMAT_ARGB32, @width, @height)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Lucida Console"">cr = Cairo::Context.new(surface)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;font-family:"Lucida Console"">cr.render_rsvg_handle(@rsvgHandle)<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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