### Re: [NTG-context] Strange behavior with Metapost

```
Hello,
Firstly, thank you for your reply. However, I would like some further
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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```

### [NTG-context] Strange behavior with Metapost

```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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```

### Re: [NTG-context] Strange behavior with Metapost

```
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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--

-
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

```
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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wiki : http://contextgarden.net
___

```

### Re: [NTG-context] Strange behavior with Metapost

```
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

-
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
-
___