Re: weekend upload

Re: weekend upload

[Jeong Dal]

Dear Aditya,

> You cannot use [offset=2mm] here. Just use \startuseMPgraphic{boxes}.
> 

After remove [offset=smm], it is working well.

Thank you for the solution.

Best regards,

Dalyoung
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Re: weekend upload

[Jeong Dal]

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Dear Aditya,

Thank you for your code and an explanation.

> Let's assume that the last MPpage was a \startuseMPgraphic{boxes} .... \stopuseMPgraphic. Suppose I wanted to use these pictures in a presentation. On the first slide, I can use
> 
>    \useMPgraphic[stacking=0]{boxes}
> 
> to show the three boxes, and on the next slide, I can use
> 
>    \useMPgraphic[stacking={-1,0}]{boxes}
> 

I tried to reproduce your example using \startuseMPgraphic{boxes} … \stopuseMPgraphic, and useMPgraphic[stacking=0]{boxes} .
A modified one of your code is below.
There is no error message but no output at all.
Would you please tell me what is wrong in here?

Best regards,
Dalyoung


\startMPdefinitions
  input boxes;

  primarydef a +- b =
    a -- (xpart a, ypart b) -- b
  enddef ;
  primarydef a -+ b =
    a -- (xpart b, ypart a) -- b
  enddef ;
\stopMPdefinitions
\defineframed
  [boxframed]
  [
    width=6em,
    height=2\lineheight,
    align={middle,lohi},
    background=color,
    backgroundcolor=blue,
    foregroundcolor=white,
    forefroundstyle=bold,
  ]

\startuseMPgraphic[offset=2mm]{boxes}
  boxit.A("\boxframed{Box A}");
  boxit.B("\boxframed{Box B}");
  boxit.C("\boxframed{Box C}");

  defaultdx := 0pt;
  defaultdy := 0pt;

  A.c = origin;

  B.w - A.e = (1cm, 0);

  0.5[ A.s, B.s ] - C.n = (0, 1cm);

  stacking := 0;
  drawunboxed(A,B,C);
  stacking := 1;
  drawarrow A.s +- C.w ;
  drawarrow B.s +- C.e ;

  newpath highlight;

  highlight := (A.sw -- B.se -- B.ne -- A.nw) enlarged EmWidth;
  fill highlight withcolor "darkgray" withstacking -1;

\stopuseMPgraphic

\starttext
\useMPgraphic[stacking={0}]{boxes}
\useMPgraphic[stacking={0,1}]{boxes}
\useMPgraphic[stacking=-1]{boxes}
\stoptext

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Re: weekend upload

[Aditya Mahajan]

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On Tue, 13 Jul 2021, Jeong Dal wrote:

> Dear Aditya,
> 
> Thank you for your code and an explanation.
> 
> > Let's assume that the last MPpage was a \startuseMPgraphic{boxes} .... \stopuseMPgraphic. Suppose I wanted to use these pictures in a presentation. On the first slide, I can use
> > 
> >    \useMPgraphic[stacking=0]{boxes}
> > 
> > to show the three boxes, and on the next slide, I can use
> > 
> >    \useMPgraphic[stacking={-1,0}]{boxes}
> > 
> 
> I tried to reproduce your example using \startuseMPgraphic{boxes} … \stopuseMPgraphic, and useMPgraphic[stacking=0]{boxes} .
> A modified one of your code is below.
> There is no error message but no output at all.
> Would you please tell me what is wrong in here?

> [...]
> \startuseMPgraphic[offset=2mm]{boxes}
> [...]

You cannot use [offset=2mm] here. Just use \startuseMPgraphic{boxes}.

Aditya

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weekend upload

[Hans Hagen]

Hi,

This weekend upload has something new for metapost animation lovers:

\starttext

\startuseMPgraphic{demo}
     stacking := 6;
     fill fullcircle scaled 10cm
         withcolor "red" ;
   % stacking := 3;
     stacking := 9;
     fill fullcircle scaled 10cm shifted (3cm,0)
         withcolor "green" ;
     interim stacking := 4;
     fill fullcircle scaled 10cm shifted (3cm,3cm)
         withcolor "blue" ;
     for i=1 upto 10 :
         draw fullcircle scaled (i*cm)
             withstacking 8
             withpen      pencircle scaled 1mm
             withcolor    "gray" ;
     endfor ;
     for i=1 upto 20 :
         draw fullcircle scaled (i*cm/2)
             withstacking (if odd(i) : i else : 5 fi)
             withpen      pencircle scaled 2mm ;
     endfor ;
     draw boundingbox currentpicture
         withpen      pencircle scaled 1pt
         withstacking 0 ;
     currentpicture := currentpicture xsized 15mm;
\stopuseMPgraphic

\setupMPvariables[demo]

\startTEXpage
     \vskip1ex
     \hbox{\space\dorecurse{10}{\useMPgraphic{demo}{list={0,#1}}\space}}
     \vskip1ex \nointerlineskip
     \hbox{\space\dorecurse{10}{\useMPgraphic{demo}{list={0,1-#1}}\space}}
     \vskip1ex
\stopTEXpage

\stoptext

I have some more ideas but want to approach it stepwise. It bpils down 
to the fact that one can put stuff on different 'layers' and optionally 
flush these (by default all are flushed but the stackling order is 
honored). An advantage is that one doesn't have to set up a graphic in 
order (read: save pictures, flush them later on) and it is actually a 
rather cheap extension in terms of runtime and overhead. Although I 
could emulate it in mkiv, it is currently an LMTX only feature.

The (optional) list accepts the usual {1,2,5,7-9} kind of specification.

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: weekend upload

[Hans Hagen]

there's an issue with textext that i'll fix

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: weekend upload

[Aditya Mahajan]

On Fri, 9 Jul 2021, Hans Hagen wrote:

> Hi,
> 
> This weekend upload has something new for metapost animation lovers:
> 
> \starttext
> 
> \startuseMPgraphic{demo}
>      stacking := 6;
>      fill fullcircle scaled 10cm
>          withcolor "red" ;
>    % stacking := 3;
>      stacking := 9;
>      fill fullcircle scaled 10cm shifted (3cm,0)
>          withcolor "green" ;
>      interim stacking := 4;
>      fill fullcircle scaled 10cm shifted (3cm,3cm)
>          withcolor "blue" ;
>      for i=1 upto 10 :
>          draw fullcircle scaled (i*cm)
>              withstacking 8
>              withpen      pencircle scaled 1mm
>              withcolor    "gray" ;
>      endfor ;
>      for i=1 upto 20 :
>          draw fullcircle scaled (i*cm/2)
>              withstacking (if odd(i) : i else : 5 fi)
>              withpen      pencircle scaled 2mm ;
>      endfor ;
>      draw boundingbox currentpicture
>          withpen      pencircle scaled 1pt
>          withstacking 0 ;
>      currentpicture := currentpicture xsized 15mm;
> \stopuseMPgraphic
> 
> \setupMPvariables[demo]
> 
> \startTEXpage
>      \vskip1ex
>      \hbox{\space\dorecurse{10}{\useMPgraphic{demo}{list={0,#1}}\space}}
>      \vskip1ex \nointerlineskip
>      \hbox{\space\dorecurse{10}{\useMPgraphic{demo}{list={0,1-#1}}\space}}
>      \vskip1ex
> \stopTEXpage
> 
> \stoptext
> 
> I have some more ideas but want to approach it stepwise. It bpils down 
> to the fact that one can put stuff on different 'layers' and optionally 
> flush these (by default all are flushed but the stackling order is 
> honored). An advantage is that one doesn't have to set up a graphic in 
> order (read: save pictures, flush them later on) and it is actually a 
> rather cheap extension in terms of runtime and overhead. Although I 
> could emulate it in mkiv, it is currently an LMTX only feature.
> 
> The (optional) list accepts the usual {1,2,5,7-9} kind of specification.

Very interesting. What will be the syntax to use this with \processMPbuffer and \startMPcode?

Aditya
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Re: weekend upload

[Hans Hagen]

On 7/9/2021 11:33 PM, Aditya Mahajan wrote:
> 
> 
> On Fri, 9 Jul 2021, Hans Hagen wrote:
> 
>> Hi,
>>
>> This weekend upload has something new for metapost animation lovers:
>>
>> \starttext
>>
>> \startuseMPgraphic{demo}
>>       stacking := 6;
>>       fill fullcircle scaled 10cm
>>           withcolor "red" ;
>>     % stacking := 3;
>>       stacking := 9;
>>       fill fullcircle scaled 10cm shifted (3cm,0)
>>           withcolor "green" ;
>>       interim stacking := 4;
>>       fill fullcircle scaled 10cm shifted (3cm,3cm)
>>           withcolor "blue" ;
>>       for i=1 upto 10 :
>>           draw fullcircle scaled (i*cm)
>>               withstacking 8
>>               withpen      pencircle scaled 1mm
>>               withcolor    "gray" ;
>>       endfor ;
>>       for i=1 upto 20 :
>>           draw fullcircle scaled (i*cm/2)
>>               withstacking (if odd(i) : i else : 5 fi)
>>               withpen      pencircle scaled 2mm ;
>>       endfor ;
>>       draw boundingbox currentpicture
>>           withpen      pencircle scaled 1pt
>>           withstacking 0 ;
>>       currentpicture := currentpicture xsized 15mm;
>> \stopuseMPgraphic
>>
>> \setupMPvariables[demo]
>>
>> \startTEXpage
>>       \vskip1ex
>>       \hbox{\space\dorecurse{10}{\useMPgraphic{demo}{list={0,#1}}\space}}
>>       \vskip1ex \nointerlineskip
>>       \hbox{\space\dorecurse{10}{\useMPgraphic{demo}{list={0,1-#1}}\space}}
>>       \vskip1ex
>> \stopTEXpage
>>
>> \stoptext
>>
>> I have some more ideas but want to approach it stepwise. It bpils down
>> to the fact that one can put stuff on different 'layers' and optionally
>> flush these (by default all are flushed but the stackling order is
>> honored). An advantage is that one doesn't have to set up a graphic in
>> order (read: save pictures, flush them later on) and it is actually a
>> rather cheap extension in terms of runtime and overhead. Although I
>> could emulate it in mkiv, it is currently an LMTX only feature.
>>
>> The (optional) list accepts the usual {1,2,5,7-9} kind of specification.
> 
> Very interesting. What will be the syntax to use this with \processMPbuffer and \startMPcode?
For now just use:

\setupMPvariables[list=4]

etc (grouped)

btw, i noticed that I need to reset something between graphics

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: weekend upload

[Hans Hagen]

On 7/9/2021 11:33 PM, Aditya Mahajan wrote:
> 
> 
> On Fri, 9 Jul 2021, Hans Hagen wrote:
> 
>> Hi,
>>
>> This weekend upload has something new for metapost animation lovers:
>>
>> \starttext
>>
>> \startuseMPgraphic{demo}
>>       stacking := 6;
>>       fill fullcircle scaled 10cm
>>           withcolor "red" ;
>>     % stacking := 3;
>>       stacking := 9;
>>       fill fullcircle scaled 10cm shifted (3cm,0)
>>           withcolor "green" ;
>>       interim stacking := 4;
>>       fill fullcircle scaled 10cm shifted (3cm,3cm)
>>           withcolor "blue" ;
>>       for i=1 upto 10 :
>>           draw fullcircle scaled (i*cm)
>>               withstacking 8
>>               withpen      pencircle scaled 1mm
>>               withcolor    "gray" ;
>>       endfor ;
>>       for i=1 upto 20 :
>>           draw fullcircle scaled (i*cm/2)
>>               withstacking (if odd(i) : i else : 5 fi)
>>               withpen      pencircle scaled 2mm ;
>>       endfor ;
>>       draw boundingbox currentpicture
>>           withpen      pencircle scaled 1pt
>>           withstacking 0 ;
>>       currentpicture := currentpicture xsized 15mm;
>> \stopuseMPgraphic
>>
>> \setupMPvariables[demo]
>>
>> \startTEXpage
>>       \vskip1ex
>>       \hbox{\space\dorecurse{10}{\useMPgraphic{demo}{list={0,#1}}\space}}
>>       \vskip1ex \nointerlineskip
>>       \hbox{\space\dorecurse{10}{\useMPgraphic{demo}{list={0,1-#1}}\space}}
>>       \vskip1ex
>> \stopTEXpage
>>
>> \stoptext
>>
>> I have some more ideas but want to approach it stepwise. It bpils down
>> to the fact that one can put stuff on different 'layers' and optionally
>> flush these (by default all are flushed but the stackling order is
>> honored). An advantage is that one doesn't have to set up a graphic in
>> order (read: save pictures, flush them later on) and it is actually a
>> rather cheap extension in terms of runtime and overhead. Although I
>> could emulate it in mkiv, it is currently an LMTX only feature.
>>
>> The (optional) list accepts the usual {1,2,5,7-9} kind of specification.
> 
> Very interesting. What will be the syntax to use this with \processMPbuffer and \startMPcode?
In order to avoid a slash I went for the 'stacking' key:

  \startMPcode[instance=doublefun,stacking=0] % 4
      draw (fullcircle scaled 5cm shifted (0cm,0cm)) withstacking 4;
      draw (fullcircle scaled 5cm shifted (0cm,0cm))
          withpattern image (fill fullcircle scaled 1cm withcolor 
"darkred" ;)
          withpatternscale (1/10,1/10)
      ;
  \stopMPcode

  \startMPpage[offset=1cm,instance=doublefun,stacking=0] % 4
      draw (fullcircle scaled 5cm shifted (0cm,0cm)) withstacking 4;
      draw (fullcircle scaled 5cm shifted (0cm,0cm))
          withpattern image (fill fullcircle scaled 1cm withcolor 
"darkblue";)
          withpatternscale (1/10,1/10)
      ;
  \stopMPpage

we also have optionals to \use.., \reuse.. and \unique..

\startTEXpage
     \vskip1ex
     \hbox{\space\dorecurse{10}{\useMPgraphic
        {demo}{stacking={0,#1}}\space}}
     \vskip1ex \nointerlineskip
     \hbox{\space\dorecurse{10}{\useMPgraphic
        {demo}{stacking={0,1-#1}}\space}}
     \vskip1ex \nointerlineskip
     \hbox{\space\dorecurse{10}{\useMPgraphic
        [instance=doublefun,stacking={0,1-#1}]{demo}\space}}
     \vskip1ex
\stopTEXpage

work in progress (new upload anyway, also with clipping fixed wrt stacking)

(i was wondering for a moment if "undergraphic removal" makes sense but 
it is a somewhat costly operation)

(an other feature to explore is not to rerun but use some wrapper that 
keeps the image for as long as we flush ... it might save some runtime 
but first i need to run into a case where it pays off)

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: weekend upload

[Bruce Horrocks]

> On 9 Jul 2021, at 17:29, Hans Hagen <j.hagen@xs4all.nl> wrote:
> 
> This weekend upload has something new for metapost animation lovers:

Forgive my ignorance but what exactly am I supposed to be seeing here? I run the example and get two rows of ten boxes. They don't move so it's not like an animated GIF was put into the PDF and they don't appear to be consecutive frames that could be joined into an animated GIF.

—
Bruce Horrocks
Hampshire, UK

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Re: weekend upload

[Hans Hagen]

On 7/11/2021 3:04 PM, Bruce Horrocks wrote:
> 
> 
>> On 9 Jul 2021, at 17:29, Hans Hagen <j.hagen@xs4all.nl> wrote:
>>
>> This weekend upload has something new for metapost animation lovers:
> 
> Forgive my ignorance but what exactly am I supposed to be seeing here? I run the example and get two rows of ten boxes. They don't move so it's not like an animated GIF was put into the PDF and they don't appear to be consecutive frames that could be joined into an animated GIF.
It's not an animation ... but there are users who make animations with 
mp and then they need stepwise build images so this feature provides 
that (instead of defining 10 different mp graphicss one can dedine just 
one).

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: weekend upload

[Aditya Mahajan]

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On Sun, 11 Jul 2021, Bruce Horrocks wrote:

> > On 9 Jul 2021, at 17:29, Hans Hagen <j.hagen@xs4all.nl> wrote:
> > 
> > This weekend upload has something new for metapost animation lovers:
> 
> Forgive my ignorance but what exactly am I supposed to be seeing here? I run the example and get two rows of ten boxes. They don't move so it's not like an animated GIF was put into the PDF and they don't appear to be consecutive frames that could be joined into an animated GIF.

For me, this feature provides the same capability as 'layers' in a graphical program. Consider the diagram shown in page 1 of the attached PDF. Suppose I want to "highlight" boxes A and B by drawing a square around them. That is easy; simply determine the bounding box of A, B (I do that manually here), and expand it a bit and draw it. Simple. See page 2. 

Now, suppose I want to fill this highlighted box. Suddenly, we have a problem. The highlight box needs to be "behind" the other boxes. How do we do it. We determine the location of boxes A, B, and C, but do not draw them. Determine the highlight box. Now draw the highlight box first and then draw the boxes. Suddenly the code became an order of magnitude more complicated. 

With the new stacking mechanism, I can just put the highlight box on "stack -1", and everything works well. See page 4. What's also super cool is that I can control what gets shown by changing the stacking key. 

Let's assume that the last MPpage was a \startuseMPgraphic{boxes} .... \stopuseMPgraphic. Suppose I wanted to use these pictures in a presentation. On the first slide, I can use

    \useMPgraphic[stacking=0]{boxes}

to show the three boxes, and on the next slide, I can use

    \useMPgraphic[stacking={-1,0}]{boxes}

to show the boxes and the highlight. Drawing such "conditional" graphics was cumbersome in the past. Now, it is easier. 

If you show a bunch of such "conditional" graphics in a sequence, you get an animation (or you could wrap around the animation module). 

Aditya

PS: Hans, stacking doesn't completely work with the boxes macro. drawunboxed is always drawn on stack 0, which the bpath is drawn on the right stack. That is the reason I use stack = -1 to put the highlight in the "background". 

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Re: weekend upload

[Hans Hagen]

On 7/12/2021 5:31 AM, Aditya Mahajan wrote:
> On Sun, 11 Jul 2021, Bruce Horrocks wrote:
> 
>>> On 9 Jul 2021, at 17:29, Hans Hagen <j.hagen@xs4all.nl> wrote:
>>>
>>> This weekend upload has something new for metapost animation lovers:
>>
>> Forgive my ignorance but what exactly am I supposed to be seeing here? I run the example and get two rows of ten boxes. They don't move so it's not like an animated GIF was put into the PDF and they don't appear to be consecutive frames that could be joined into an animated GIF.
> 
> For me, this feature provides the same capability as 'layers' in a graphical program. Consider the diagram shown in page 1 of the attached PDF. Suppose I want to "highlight" boxes A and B by drawing a square around them. That is easy; simply determine the bounding box of A, B (I do that manually here), and expand it a bit and draw it. Simple. See page 2.
> 
> Now, suppose I want to fill this highlighted box. Suddenly, we have a problem. The highlight box needs to be "behind" the other boxes. How do we do it. We determine the location of boxes A, B, and C, but do not draw them. Determine the highlight box. Now draw the highlight box first and then draw the boxes. Suddenly the code became an order of magnitude more complicated.
> 
> With the new stacking mechanism, I can just put the highlight box on "stack -1", and everything works well. See page 4. What's also super cool is that I can control what gets shown by changing the stacking key.
> 
> Let's assume that the last MPpage was a \startuseMPgraphic{boxes} .... \stopuseMPgraphic. Suppose I wanted to use these pictures in a presentation. On the first slide, I can use
> 
>      \useMPgraphic[stacking=0]{boxes}
> 
> to show the three boxes, and on the next slide, I can use
> 
>      \useMPgraphic[stacking={-1,0}]{boxes}
> 
> to show the boxes and the highlight. Drawing such "conditional" graphics was cumbersome in the past. Now, it is easier.
> 
> If you show a bunch of such "conditional" graphics in a sequence, you get an animation (or you could wrap around the animation module).
> 
> Aditya
> 
> PS: Hans, stacking doesn't completely work with the boxes macro. drawunboxed is always drawn on stack 0, which the bpath is drawn on the right stack. That is the reason I use stack = -1 to put the highlight in the "background".
I need to ckeck if the range checked does negative numbers ... anyway, 
you can do this

\startMPpage[offset=2mm, stacking={1,2,3,4}]

   boxit.A("\boxframed{Box A}");
   boxit.B("\boxframed{Box B}");
   boxit.C("\boxframed{Box C}");

   defaultdx := 0pt;
   defaultdy := 0pt;

   A.c = origin;

   B.w - A.e = (1cm, 0);

   0.5[ A.s, B.s ] - C.n = (0, 1cm);

   draw image (drawunboxed(A,B,C)) withstacking 2;

   drawarrow A.s +- C.w withstacking 3 ;
   drawarrow B.s +- C.e withstacking 4 ;

   newpath highlight;

   highlight := (A.sw -- B.se -- B.ne -- A.nw) enlarged EmWidth;
   fill highlight withcolor "darkgray" withstacking 1;

\stopMPpage

but only the first edge in an image picture is adapted ... (i actually 
know that i need to fix that in mplib because i noticed the same issue 
with color etc (some old issue)

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: weekend upload

[Floris van Manen]

[-- Attachment #1: Type: text/plain, Size: 953 bytes --]

with the latest version not everything gets drawn as intended.


$ context --version
mtx-context     | ConTeXt Process Management 1.04
mtx-context     | current version: 2021.07.10 21:51




On 12/07/2021 10:07, Hans Hagen wrote:
> I need to ckeck if the range checked does negative numbers ... anyway, 
> you can do this
> 
> \startMPpage[offset=2mm, stacking={1,2,3,4}]
> 
>    boxit.A("\boxframed{Box A}");
>    boxit.B("\boxframed{Box B}");
>    boxit.C("\boxframed{Box C}");
> 
>    defaultdx := 0pt;
>    defaultdy := 0pt;
> 
>    A.c = origin;
> 
>    B.w - A.e = (1cm, 0);
> 
>    0.5[ A.s, B.s ] - C.n = (0, 1cm);
> 
>    draw image (drawunboxed(A,B,C)) withstacking 2;
> 
>    drawarrow A.s +- C.w withstacking 3 ;
>    drawarrow B.s +- C.e withstacking 4 ;
> 
>    newpath highlight;
> 
>    highlight := (A.sw -- B.se -- B.ne -- A.nw) enlarged EmWidth;
>    fill highlight withcolor "darkgray" withstacking 1;
> 
> \stopMPpage

[-- Attachment #2: Screenshot_20210712_120841.png --]
[-- Type: image/png, Size: 6251 bytes --]

[-- Attachment #3: Type: text/plain, Size: 493 bytes --]

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Re: weekend upload

[Hans Hagen]

On 7/12/2021 12:12 PM, Floris van Manen wrote:
> with the latest version not everything gets drawn as intended.
> 
> 
> $ context --version
> mtx-context     | ConTeXt Process Management 1.04
> mtx-context     | current version: 2021.07.10 21:51
> 
> 
> 
> 
> On 12/07/2021 10:07, Hans Hagen wrote:
>> I need to ckeck if the range checked does negative numbers ... anyway, 
>> you can do this
>>
>> \startMPpage[offset=2mm, stacking={1,2,3,4}]
>>
>>    boxit.A("\boxframed{Box A}");
>>    boxit.B("\boxframed{Box B}");
>>    boxit.C("\boxframed{Box C}");
>>
>>    defaultdx := 0pt;
>>    defaultdy := 0pt;
>>
>>    A.c = origin;
>>
>>    B.w - A.e = (1cm, 0);
>>
>>    0.5[ A.s, B.s ] - C.n = (0, 1cm);
>>
>>    draw image (drawunboxed(A,B,C)) withstacking 2;
>>
>>    drawarrow A.s +- C.w withstacking 3 ;
>>    drawarrow B.s +- C.e withstacking 4 ;
>>
>>    newpath highlight;
>>
>>    highlight := (A.sw -- B.se -- B.ne -- A.nw) enlarged EmWidth;
>>    fill highlight withcolor "darkgray" withstacking 1;
>>
>> \stopMPpage
indeed, that why i mentioned that the next version will do (but no 
upload today)

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: weekend upload

[Hans Hagen]

On 7/12/2021 5:31 AM, Aditya Mahajan wrote:
> On Sun, 11 Jul 2021, Bruce Horrocks wrote:
> 
>>> On 9 Jul 2021, at 17:29, Hans Hagen <j.hagen@xs4all.nl> wrote:
>>>
>>> This weekend upload has something new for metapost animation lovers:
>>
>> Forgive my ignorance but what exactly am I supposed to be seeing here? I run the example and get two rows of ten boxes. They don't move so it's not like an animated GIF was put into the PDF and they don't appear to be consecutive frames that could be joined into an animated GIF.
> 
> For me, this feature provides the same capability as 'layers' in a graphical program. Consider the diagram shown in page 1 of the attached PDF. Suppose I want to "highlight" boxes A and B by drawing a square around them. That is easy; simply determine the bounding box of A, B (I do that manually here), and expand it a bit and draw it. Simple. See page 2.
> 
> Now, suppose I want to fill this highlighted box. Suddenly, we have a problem. The highlight box needs to be "behind" the other boxes. How do we do it. We determine the location of boxes A, B, and C, but do not draw them. Determine the highlight box. Now draw the highlight box first and then draw the boxes. Suddenly the code became an order of magnitude more complicated.
> 
> With the new stacking mechanism, I can just put the highlight box on "stack -1", and everything works well. See page 4. What's also super cool is that I can control what gets shown by changing the stacking key.
> 
> Let's assume that the last MPpage was a \startuseMPgraphic{boxes} .... \stopuseMPgraphic. Suppose I wanted to use these pictures in a presentation. On the first slide, I can use
> 
>      \useMPgraphic[stacking=0]{boxes}
> 
> to show the three boxes, and on the next slide, I can use
> 
>      \useMPgraphic[stacking={-1,0}]{boxes}
> 
> to show the boxes and the highlight. Drawing such "conditional" graphics was cumbersome in the past. Now, it is easier.
> 
> If you show a bunch of such "conditional" graphics in a sequence, you get an animation (or you could wrap around the animation module).
> 
> Aditya
> 
> PS: Hans, stacking doesn't completely work with the boxes macro. drawunboxed is always drawn on stack 0, which the bpath is drawn on the right stack. That is the reason I use stack = -1 to put the highlight in the "background".

in a netx upload this will work ok

\startMPpage[offset=2mm, stacking={1,2}]

     draw fullsquare scaled 4cm withstacking 2 withcolor "red" ;
     draw image (
         draw fullsquare scaled 2cm withstacking 3 withcolor "green" 
withstacking 3 ;
         draw fullsquare scaled 1cm withstacking 4 withcolor "blue" 
withstacking 4 ;
     ) withstacking 2 withcolor "cyan";

     drawarrow llcorner currentpicture .. origin withstacking 3;
\stopMPpage





-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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