Re: Charting module

[Hans Hagen <pragma@wxs.nl>]

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Hi,

I'm willing to look into extensions later this year but we should then 
collect the wishes first. I know that for instance Tobias has some wishes 
with regards to straight lines [not that complicated] and i'm sure that 
Willy has some too.

while with half-grid steps I could put the intermediate link box 0
>(which btw shows as an empty dot; how to make it disappear so that

i see no quick hack [have to print the module] for the dot.

>A second question is about connection points. Despite the
>recommendations in the manual about trying to avoid multiple
>(outgoing) links per side (using e.g. [-b] or [+b]), I find this
>possibility helpful, and actually essential in the above mentioned
>example, where "Box 1" has two connection at the bottom (left and
>right). (Yes I know I should rearrange the chart, but I don't want
>to; I prefer it this way.)

this looks doable and is mostly a matter of interfacing

>However, these connections are too spaced away, because they are
>at about 1/4, 3/4 of the side, which is essential if a third
>connection (midpoint) is used, but sub-optimal when only two
>connections are used (a better positioning in this case would be
>to use a 1/3, 2/3 spacing). The suggestion resolves finally in
>either giving the user the possibility to control position of the
>connection points, or providing automatically the best position
>depending on how many connection points are actually used. (And
>what about allowing the users to have "as many connection points
>per side as desired"? Imagine a (horrible?) thing with five
>connection points: ++b, +b, b, -b, --b !)

horrible indeed but 1 / 2 / 3 / 5 connections as option are ok

>Finally: why do corner radius and arrow size share the same value?
>Is there a way to change the value for some connections only and
>activate/deactivate arrows for specific connections? is there a
>way to force a straight arrow even when by default it would come
>out bended?

i suppose that you looked into m-chart -) most is configurable in the mp 
module, so again it's mostly a matter of interfacing [and lazyness of me]

concerning changes in settings: you can change them in the flow and use 
grouping if needed, so you can have one connection with arrows and another 
with no arrows.

Also: for lovers of <angle brackets> i have a xml interface to flowcharts; 
combined with mathml and stepcharts and alike, this gives impressive chunks 
of xml

Hans

[-- Attachment #2: demo-001.tex --]
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% output=pdftex interface=en

\usemodule[chart,mathml,steps]

\setupcolors[state=start] \setupbodyfont[lbr,8pt]
\setuplayout[width=middle,height=middle,backspace=1cm,topspace=1cm,header=0pt,footer=0pt]

\startbuffer[xml]
<flowchartdefinition identifier="test">
  <?context-flowchart-directive lines color darkgreen ?>
  <flowcell>
    <name> tex </name>
    <location> <x> 1 </x> <y> 1 </y> </location>
    <shape> action </shape>
    <text> &tex; </text>
    <connection> <type> rl </type> <name> context </name> </connection>
  </flowcell>
  <?context-begin-group a very important cell ?>
  <?context-flowchart-directive shapes framecolor darkred ?>
  <flowcell>
    <?context-flowchart-directive lines color darkyellow ?>
    <name> context </name>
    <location> <x> 2 </x> <y> 1 </y> </location>
    <shape> action </shape>
    <text>
      <stepchart>
        <cell> one   </cell> <text> even </text>
        <cell> two   </cell> <text> odd  </text>
        <cell> three </cell>
      </stepchart>
    </text>
    <connection> <type> rl </type> <name> rubish </name> </connection>
  </flowcell>
  <?context-end-group a very important cell ?>
  <flowcell>
    <name> rubish </name>
    <location> <x> 1 </x> <y> 2 </y> </location>
    <shape> action </shape>
    <text> <m> 1+2=3 </m> </text>
    <connection> <type> rl </type> <name> another </name> </connection>
  </flowcell>
  <flowcell>
    <?context-flowchart-directive lines color darkblue ?>
    <name> another </name>
    <location> <x> 2 </x> <y> 2 </y> </location>
    <shape> action </shape>
    <text>
      <math> <apply> <sin/> <apply> <plus/>
        <cn> 2 </cn> <ci> a </ci>
      </apply> </apply> </math>
    </text>
    <connection> <type> bt </type> <name> tex </name> </connection>
  </flowcell>
</flowchartdefinition>

<flowchart identifier="test"/>
\stopbuffer

\startbuffer[tex]
\startFLOWchart [test]
  \setupFLOWlines[color=darkgreen]
  \startFLOWcell 
    \name{tex}
    \location{1,1}
    \shape{action}
    \text{\TeX}
    \connect[rl]{context}
  \stopFLOWcell 
  \start
  \setupFLOWshapes[framecolor=darkred]
  \startFLOWcell 
    \setupFLOWlines[color=darkyellow]
    \name{context}
    \location{2,1}
    \shape{action}
    \text
      {\startSTEPchart
         \cell{one}  \text{even}
         \cell{two}  \text{odd}
         \cell{three} 
       \stopSTEPchart}
    \connect[rl]{rubish}
  \stopFLOWcell 
  \stop
  \startFLOWcell 
    \name{rubish}
    \location{1,2}
    \shape{action}
    \text{$1+2=3$}
    \connect[rl]{another}
  \stopFLOWcell 
  \startFLOWcell 
    \setupFLOWlines[color=darkblue]
    \name{another}
    \location{2,2}
    \shape{action}
    \text{$\sin(2+a)$}
    \connect[bt]{tex}
  \stopFLOWcell 
\stopFLOWchart

\FLOWchart[test]
\stopbuffer

\starttext

\processXMLbuffer[xml] \typebuffer[xml] \page 

\getbuffer[tex] \typebuffer[tex]

\stoptext

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                                   Hans Hagen | PRAGMA ADE | pragma@wxs.nl
                       Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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