Command "show" in Metapost/Metafun

Command "show" in Metapost/Metafun

[Curious Learn]

Hi,

I am trying to learn Metapost using Context. I tried a few examples for drawing
things and they worked well. But the "show" command does not seem to work. For
example, the code 

\startuseMPgraphic{GridDots}
	u=1cm;
	pickup pencircle scaled 8pt
	for i = 0 upto 2:
		for j = 0 upto 2: draw (i*u,j*u); endfor
	endfor 
\stopuseMPgraphic  
\useMPgraphic{GridDots}  

from John Hobby's manual works great. 

However, the following code gives no output in the PDF file. Am I doing
something wrong?

\startuseMPgraphic{LinearEq}
   a+b = 2a - b = 3;
   show a,b;
\stopuseMPgraphic  
\useMPgraphic{LinearEq}  

I am using the following version from Texlive
ConTeXt  ver: 2008.05.21 15:21 MKII  fmt: 2008.10.1  int: english/english

Thanks for your help.

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___________________________________________________________________________________

Re: Command "show" in Metapost/Metafun

[Aditya Mahajan]

On Thu, 12 Mar 2009, Curious Learn wrote:

> Hi,
>
> I am trying to learn Metapost using Context. I tried a few examples for drawing
> things and they worked well. But the "show" command does not seem to work. For
> example, the code
>
> \startuseMPgraphic{GridDots}
> 	u=1cm;
> 	pickup pencircle scaled 8pt
> 	for i = 0 upto 2:
> 		for j = 0 upto 2: draw (i*u,j*u); endfor
> 	endfor
> \stopuseMPgraphic
> \useMPgraphic{GridDots}
>
> from John Hobby's manual works great.
>
> However, the following code gives no output in the PDF file. Am I doing
> something wrong?
>
> \startuseMPgraphic{LinearEq}
>   a+b = 2a - b = 3;
>   show a,b;
> \stopuseMPgraphic
> \useMPgraphic{LinearEq}
>
> I am using the following version from Texlive
> ConTeXt  ver: 2008.05.21 15:21 MKII  fmt: 2008.10.1  int: english/english

The output of show goes to the terminal and the log file. Look for the 
values in filename-mpgraph.log.

Aditya
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___________________________________________________________________________________

Re: Command "show" in Metapost/Metafun

[Hans Hagen]

Aditya Mahajan wrote:
> On Thu, 12 Mar 2009, Curious Learn wrote:
> 
>> Hi,
>>
>> I am trying to learn Metapost using Context. I tried a few examples 
>> for drawing
>> things and they worked well. But the "show" command does not seem to 
>> work. For
>> example, the code
>>
>> \startuseMPgraphic{GridDots}
>>     u=1cm;
>>     pickup pencircle scaled 8pt
>>     for i = 0 upto 2:
>>         for j = 0 upto 2: draw (i*u,j*u); endfor
>>     endfor
>> \stopuseMPgraphic
>> \useMPgraphic{GridDots}
>>
>> from John Hobby's manual works great.
>>
>> However, the following code gives no output in the PDF file. Am I doing
>> something wrong?
>>
>> \startuseMPgraphic{LinearEq}
>>   a+b = 2a - b = 3;
>>   show a,b;
>> \stopuseMPgraphic
>> \useMPgraphic{LinearEq}
>>
>> I am using the following version from Texlive
>> ConTeXt  ver: 2008.05.21 15:21 MKII  fmt: 2008.10.1  int: english/english
> 
> The output of show goes to the terminal and the log file. Look for the 
> values in filename-mpgraph.log.

\ctxlua{metapost.showlog = true}


-----------------------------------------------------------------
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               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: Command "show" in Metapost/Metafun

[Aditya Mahajan]

On Thu, 12 Mar 2009, Hans Hagen wrote:

> \ctxlua{metapost.showlog = true}

Can you make this default?

Aditya
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Thanks. Two new questions: rotate and scale

[Curious Learn]

Aditya and Hans,

Thanks very much for your replies. I suppose I should install minimals afterall.
Still using the TexLive version. 

I have two new questions:

(1) In the following code the triangle outline (obtained with the "draw"
command) does not rotate, i.e., I get the same triangle as without the "rotated"
command. On the other hand the fill command rotates as expected. What is wrong?

\startuseMPgraphic{Dir} 
pickup pencircle scaled 2pt;
numeric u;
u=2cm;
draw (0,0) -- dir(0)*u -- dir(60)*u --cycle rotated 60;
fill (0,0) -- dir(0)*u -- dir(60)*u --cycle rotated 60 withcolor (0.58,0.94,0.9);
\stopuseMPgraphic  
\useMPgraphic{Dir} 


(2) Is there a command to scale the whole picture...not the components? 

Thanks very much. 

I have said this before but want to say this again. Thanks so much to the
developers of Context who have given us this wonderful system. Thanks also to
all the people on this mailing list who take their precious time to answer
questions.   

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Re: Thanks. Two new questions: rotate and scale

[Albrecht Kauffmann]

only to (1): try

draw (((0,0) -- dir(0)*u -- dir(60)*u --cycle) rotated 60);

greetings,
Albrecht


On Thu, 12 Mar 2009, Curious Learn wrote:

> Aditya and Hans,
>
> Thanks very much for your replies. I suppose I should install minimals afterall.
> Still using the TexLive version.
>
> I have two new questions:
>
> (1) In the following code the triangle outline (obtained with the "draw"
> command) does not rotate, i.e., I get the same triangle as without the "rotated"
> command. On the other hand the fill command rotates as expected. What is wrong?
>
> \startuseMPgraphic{Dir}
> pickup pencircle scaled 2pt;
> numeric u;
> u=2cm;
> draw (0,0) -- dir(0)*u -- dir(60)*u --cycle rotated 60;
> fill (0,0) -- dir(0)*u -- dir(60)*u --cycle rotated 60 withcolor (0.58,0.94,0.9);
> \stopuseMPgraphic
> \useMPgraphic{Dir}
>
>
> (2) Is there a command to scale the whole picture...not the components?
>
> Thanks very much.
>
> I have said this before but want to say this again. Thanks so much to the
> developers of Context who have given us this wonderful system. Thanks also to
> all the people on this mailing list who take their precious time to answer
> questions.
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>
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___________________________________________________________________________________

Re: Thanks. Two new questions: rotate and scale

[Curious Learn]

Albrecht Kauffmann <alkauffm <at> rz.uni-potsdam.de> writes:

> 
> only to (1): try
> 
> draw (((0,0) -- dir(0)*u -- dir(60)*u --cycle) rotated 60);

Thanks Albrecht. That worked great.

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___________________________________________________________________________________

Re: Thanks. Two new questions: rotate and scale

[Taco Hoekwater]

>>
>> (2) Is there a command to scale the whole picture...not the components?

Parse error. In my view, the whole picture *is* the components.

Best wishes,
Taco

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Re: Thanks. Two new questions: rotate and scale

[Curious Learn]

Taco Hoekwater <taco <at> elvenkind.com> writes:


> >> (2) Is there a command to scale the whole picture...not the components?
> 
> Parse error. In my view, the whole picture *is* the components.
> 
> Best wishes,
> Taco

Hi Taco,

Sorry for the typo and for not being clear. I meant the following. I know that
"scaled" command can be used to scale any particular component. To scale the
whole picture does one have to scale each and every component individually, or
is there one command that scales every component. 

One way is perhaps to define a variable, say u=1cm and express all measurements
in terms of "u". Then by changing just "u" one can scale the whole picture (and
all the components) up or down. Is there another way? For example, in TikZ there
is a command "scale" which scales the entire picture if put as an option to
\begin{tikzpicture}. I was wondering if something like that is available in
Metapost too.




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___________________________________________________________________________________

Re: Thanks. Two new questions: rotate and scale

[Mikael Persson]

On Fri, Mar 13, 2009 at 2:39 PM, Curious Learn <curiouslearn@gmail.com> wrote:
> Taco Hoekwater <taco <at> elvenkind.com> writes:
>
>
>> >> (2) Is there a command to scale the whole picture...not the components?
>>
>> Parse error. In my view, the whole picture *is* the components.
>>
>> Best wishes,
>> Taco
>
> Hi Taco,
>
> Sorry for the typo and for not being clear. I meant the following. I know that
> "scaled" command can be used to scale any particular component. To scale the
> whole picture does one have to scale each and every component individually, or
> is there one command that scales every component.
>
> One way is perhaps to define a variable, say u=1cm and express all measurements
> in terms of "u". Then by changing just "u" one can scale the whole picture (and
> all the components) up or down. Is there another way? For example, in TikZ there
> is a command "scale" which scales the entire picture if put as an option to
> \begin{tikzpicture}. I was wondering if something like that is available in
> Metapost too.
>

Hi,

I use the method of
u=1mm;
in the beginning and then use u as the "unit".
I think "currentpicture" is what you are after otherwise, but not sure.

Mikael
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Re: Thanks. Two new questions: rotate and scale

[Taco Hoekwater]

Curious Learn wrote:
> Taco Hoekwater <taco <at> elvenkind.com> writes:
> 
> 
>>>> (2) Is there a command to scale the whole picture...not the components?
>> Parse error. In my view, the whole picture *is* the components.
>>
>> Best wishes,
>> Taco
> 
> Hi Taco,
> 
> Sorry for the typo and for not being clear. I meant the following. I know that
> "scaled" command can be used to scale any particular component. To scale the
> whole picture does one have to scale each and every component individually, or
> is there one command that scales every component. 

You want this, I think:

  beginfig(1);
  ... do stuff ...
  currentpicture := currentpicture scaled X;
  endfig;


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___________________________________________________________________________________

Re: Thanks. Two new questions: rotate and scale

[Curious Learn]

Taco Hoekwater <taco <at> elvenkind.com> writes:

> 
> You want this, I think:
> 
>   beginfig(1);
>   ... do stuff ...
>   currentpicture := currentpicture scaled X;
>   endfig;
> 
 
Awesome!! This is exactly what I was looking for. 

Thanks Taco and Mikael.


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