Re: [NTG-context] Strange behavior with Metapost

2014-05-28 Thread Fabrice 

Hello,
Firstly, thank you for your reply. However, I would like some further 
explanation please.
If I understand, but I'm not sure at all, calculating (xmax-xmin) / 10 
gives the number of points to draw the curve. However, in my example, 
xmax = 4 and xmin = -2, so (xmax-xmin) / 10 = 0.6. My question is : how 
do you find the value in 1000 ?

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Re: [NTG-context] Strange behavior with Metapost

2014-05-27 Thread Hans Hagen 

On 5/28/2014 12:09 AM, Fabrice wrote:

It works. But how to choose not to avoid this problem (/10 or /20 or
) ?


well, you can guess the amount of steps ... but the 1000 you had 
originally was way too much




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  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
 | www.pragma-pod.nl
-
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Re: [NTG-context] Strange behavior with Metapost

2014-05-27 Thread Fabrice 

It works. But how to choose not to avoid this problem (/10 or /20 or ) ?

Another little problem: if I use

" setbounds currentpicture to boundingbox (((xmin,ymin) --(xmax,ymax)) 
scaled u) ; "


the images are not adjusted to the BoundingBox.
So I'm back to my original idea.
Fabrice


\midaligned{%
\startcombination[4*1]
{%
\startMPcode
 input hvdm;
 l:=2.8mm; r:=0.6; alfa:=45; beta:=0; gamma:=0;
 defineDefaultArrow (l, r, alfa, beta, gamma);
 numeric xmin, xmax, ymin, ymax;
 xmin := -2; xmax :=4; ymax :=5 ;ymin:=-1; u := 0.7cm;
 pickup pencircle scaled 1pt ;
 drawarrow ((xmin,0) -- (xmax,0)) scaled u;
 drawarrow ((0,ymin) -- (0,ymax)) scaled u;
 draw tightfunction ("x", "-2*(x-1)*(x-1)+2", xmin, xmax, 
(xmax-xmin)/20)

 scaled u;
 path screen;
screen=(xmin,ymin)*u--(xmax,ymin)*u--(xmax,ymax)*u--(xmin,ymax)*u--cycle;
 clip currentpicture to screen;
\stopMPcode
}{1.}
{%
\startMPcode
 input hvdm;
 l:=2.8mm; r:=0.6; alfa:=45; beta:=0; gamma:=0;
 defineDefaultArrow (l, r, alfa, beta, gamma);
 numeric xmin, xmax, ymin, ymax;
 xmin := -2; xmax :=4; ymax :=5 ;ymin:=-1; u := 0.7cm;
 pickup pencircle scaled 1pt ;
 drawarrow ((xmin,0) -- (xmax,0)) scaled u;
 drawarrow ((0,ymin) -- (0,ymax)) scaled u;
 draw tightfunction ("x", "0.5*(x-1)*(x-1)+2", xmin, xmax, 
(xmax-xmin)/20)

 scaled u;
 path screen;
screen=(xmin,ymin)*u--(xmax,ymin)*u--(xmax,ymax)*u--(xmin,ymax)*u--cycle;
 clip currentpicture to screen;
\stopMPcode
}
{2.}
{%
\startMPcode
 input hvdm;
 l:=2.8mm; r:=0.6; alfa:=45; beta:=0; gamma:=0;
 defineDefaultArrow (l, r, alfa, beta, gamma);
 numeric xmin, xmax, ymin, ymax;
 xmin := -2; xmax :=4; ymax :=5 ;ymin:=-1; u := 0.7cm;
 pickup pencircle scaled 1pt ;
 drawarrow ((xmin,0) -- (xmax,0)) scaled u;
 drawarrow ((0,ymin) -- (0,ymax)) scaled u;
 draw tightfunction ("x", "-0.5*(x-1)*(x-1)+2", xmin, xmax, 
(xmax-xmin)/20)

 scaled u;
 path screen;
screen=(xmin,ymin)*u--(xmax,ymin)*u--(xmax,ymax)*u--(xmin,ymax)*u--cycle;
 clip currentpicture to screen;
\stopMPcode
}
{3.}
{%
\startMPcode
 input hvdm;
 l:=2.8mm; r:=0.6; alfa:=45; beta:=0; gamma:=0;
 defineDefaultArrow (l, r, alfa, beta, gamma);
 numeric xmin, xmax, ymin, ymax;
 xmin := -2; xmax :=4; ymax :=5 ;ymin:=-1; u := 0.7cm;
 pickup pencircle scaled 1pt ;
 drawarrow ((xmin,0) -- (xmax,0)) scaled u;
 drawarrow ((0,ymin) -- (0,ymax)) scaled u;
 draw tightfunction ("x", "2*(x-1)*(x-1)+2", xmin, xmax, 
(xmax-xmin)/20)

 scaled u;
 path screen;
screen=(xmin,ymin)*u--(xmax,ymin)*u--(xmax,ymax)*u--(xmin,ymax)*u--cycle;
 clip currentpicture to screen;
\stopMPcode}
{4.}
\stopcombination}


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Re: [NTG-context] Strange behavior with Metapost

2014-05-27 Thread Hans Hagen 

On 5/27/2014 10:19 PM, Fabrice Couvreur wrote:

Hello,
Why curve drawn is not that expected ?
Fabrice


use  /20


\starttext
\startMPcode
  input hvdm;
  l:=2.8mm; r:=0.6; alfa:=45; beta:=0; gamma:=0;
  defineDefaultArrow (l, r, alfa, beta, gamma);
  numeric xmin, xmax, ymin, ymax;
  xmin :=-2; xmax := 4; ymax :=5 ;ymin:=-1; u := 1cm;
  pickup pencircle scaled 1pt ;
  drawarrow ((xmin,0) -- (xmax,0)) scaled u;
  drawarrow ((0,ymin) -- (0,ymax)) scaled u;
  draw tightfunction ("x", "2*(x-1)*(x-1)+2", xmin, xmax,
(xmax-xmin)/10)
  scaled u;
  setbounds currentpicture to boundingbox (((xmin,ymin) --
  (xmax,ymax)) scaled u);
\stopMPcode
\stoptext



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--

-
  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
 | www.pragma-pod.nl
-
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[NTG-context] Strange behavior with Metapost

2014-05-27 Thread Fabrice Couvreur 
Hello,
Why curve drawn is not that expected ?
Fabrice

\starttext
\startMPcode
 input hvdm;
 l:=2.8mm; r:=0.6; alfa:=45; beta:=0; gamma:=0;
 defineDefaultArrow (l, r, alfa, beta, gamma);
 numeric xmin, xmax, ymin, ymax;
 xmin :=-2; xmax := 4; ymax :=5 ;ymin:=-1; u := 1cm;
 pickup pencircle scaled 1pt ;
 drawarrow ((xmin,0) -- (xmax,0)) scaled u;
 drawarrow ((0,ymin) -- (0,ymax)) scaled u;
 draw tightfunction ("x", "2*(x-1)*(x-1)+2", xmin, xmax,
(xmax-xmin)/10)
 scaled u;
 setbounds currentpicture to boundingbox (((xmin,ymin) --
 (xmax,ymax)) scaled u);
\stopMPcode
\stoptext
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