Re: SVG generation in Lua

["Stuart P. Bentley" <stuart@...>]

Woah, crazy! Not only was I wondering about SVG generation in Lua the other
day, but I've also written a modeling framework that works almost exactly
like this!

function hq.thriller()
 local waist=.825
 local shoulders=.3
 local shouldout=.1
 local blackw=.05
 local headheight=.15
 local hairw=.5
 local hairh=.4
 local neckout=.15

 local hcenter=right/2

 color(1,1,1)
 rect(left,top,right,bottom)
 --hair
 color(.02,.01,0)
   cutcircle({hcenter,headheight},hairw,25,160,hairh)
   cutcircle({hcenter,headheight},hairw,120,230,hairh)
 --base jacket
 color(1,0,0)
   rect(left,top+shoulders,right,bottom)
   polygon(
     {left-shouldout,shoulders},
     {right+shouldout,shoulders},
     {right-hcenter/2,bottom},
     {left+hcenter/2,bottom})
 --lines
 color(0,0,0)
   parallelogram(
     {left-blackw,shoulders},
     {hcenter-blackw,bottom},
     blackw)
   parallelogram(
     {right,shoulders},
     {hcenter,bottom},
     blackw)
   polygon(
   {hcenter-neckout,shoulders},
   {hcenter+neckout,shoulders},
   {hcenter,waist}
   )
end

(This gets passed to a function "model", which uses as an environment a
table of primitive-generating functions. The result is attached, and yes, 
due to a slight miscalculation I haven't bothered to fix, the "hair" wedges 
above the top of the "head".)

Also, would SVG work as a driver for CanvasDraw?


--------------------------------------------------
From: "Asko Kauppi" <askok@dnainternet.net>
Sent: Wednesday, August 12, 2009 A12:32
Newsgroups: gmane.comp.lang.lua.general
To: "Lua list" <lua@bazar2.conectiva.com.br>
Subject: Re: SVG generation in Lua

> I've planned a separate svggraph module for such. This is just a  start. 
> So, not yet.
>
> - asko
>
> On 12.8.2009, at 9.59, Lloyd <lloyd@cdactvm.in> wrote:
>
> > Is there any method available to plot interactive graphs using this 
> > method? For example if we have millions of items in a graph, it will  be 
> > difficult to present in a single screen. In that case, we will  represent 
> > items as very small items, and will give the user more  option to zoom 
> > the graph. Like this, is it possible to draw an  interactive graph?
> >
> > Thanks,
> >  Lloyd
> >
> >
> > On Wed, 12 Aug 2009 11:43:23 +0530, Asko Kauppi  <askok@dnainternet.net> 
> > wrote:
> >
> > > I'll be doing some SVG graphics work and applied some Lumikki-kind 
> > > thinking to making a simple SVG generation tool, in Lua.
> > >
> > > Currently available only by svn checkout, from:
> > >
> > >    svn co svn://slugak.dyndns.org/public/2009/Svg
> > >
> > > Here's one of the sample files:
> > >
> > > --
> > > -- ELLIPSE1.LUA
> > > --
> > >
> > > require "svgcore"
> > >
> > > local rgb= assert(svg.rgb)
> > >
> > > print( svg.document(
> > >     svg.default{ stroke_dasharray={2,2},
> > >         --
> > >         svg.ellipse{ {80,110}, {75,105}, fill="#538" },
> > >         svg.ellipse{ {80,110}, {60,40}, fill="black", stroke="red", 
> > > stroke_width=25 },
> > >         svg.ellipse{ {80,110}, {35,20}, fill="#538",  stroke="yellow", 
> > > stroke_width=25 },
> > >         svg.ellipse{ {80,50}, {40,30}, fill="red", stroke="black", 
> > > stroke_width=25 },
> > >         svg.ellipse{ {80,50}, {30,20}, fill="orange", stroke="red", 
> > > stroke_width=10 },
> > >         svg.ellipse{ {80,170}, {40,30}, fill="yellow",  stroke="orange", 
> > > stroke_width=25 },
> > >         svg.ellipse{ {80,170}, {30,20}, fill="red", stroke="black", 
> > > stroke_width=10 }
> > >     }
> > > ) )
> > >
> > > The idea is that Lua syntax is a bit nicer to craft than XML, but  this 
> > > also allows programmatic creation of macro-like objects  (functions that 
> > > create graphical objects) that can be turned  around, copied etc.. SVG 
> > > has a "uses" element for that, but this is  more easy on the eyes 
> > > (clearer code).
> > >
> > > I post this mostly to inform if anyone has a similar need. Be my  guest 
> > > and use it. Haven't decided the license yet.
> > >
> > > Btw, SVG + JavaScript is a perfect blend for making visually good- 
> > > looking UI applications.  SVG in theory support any scripting  language, 
> > > so maybe we can at one day have SVG+Lua viewer.
> > >
> > > -asko
> >
> >
> >
> > ______________________________________
> > Scanned and protected by Email scanner

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