Re: [NTG-context] How to "unfill" a picture?

25 Jun 2009


      Hi Zichu,

an other approach (mkiv + lilypond font):

\definefont[music][name:emmentaler20 at 72pt]
\starttext
\music\char57770
\stoptext

:-)

Greetings Lutz

2009/6/24 Zhichu Chen 
...
Hi Nicola,
Thank you very much for your example and the idea. It's amazing,
I thought it's just a metafont thing and metapost just can't do that.
Thank you for your information again.
On Wed, Jun 24, 2009 at 10:12 PM, Nicola wrote:
...
In article
<769ba7780906240342s4939ac2foe7bfd783ad2e82ee@mail.gmail.com>,
 Zhichu Chen  wrote:
...
Well, my example is too simple. Actually, I was trying to draw a
treble clef
If your goal is to draw a path with pens of varying width (kind of
calligraphic strokes),'penpos' and 'penstroke' may be your friends
(defined in plain.mp). This is what I've come out with by about 15
minutes of trial and error (disclaimer: this is my first attempt at
using these macros beyond trying to draw a sans-serif 'l' - I'm not a
designer at all):
fill unitsquare scaled 12cm shifted (-6cm,-6cm) withcolor .625red;
  b = 2pt; % Default pen width
  w = 30mm; % Width of treble clef
  h = 100mm; % Height of treble clef
  % Specify breadth and angle of pen at keypoints:
  penpos 1 (0.5b, 30);
  penpos 1.5 (b, 15);
  penpos 2 (3b, 0);
  penpos 3 (5b, -90);
  penpos 4 (3b, -180);
  penpos 5 (b, 90);
  penpos 6 (5b,0);
  penpos 6.5 (4b, -30);
  penpos 7 (.5b, 0);
  penpos 8 (5b, 90);
  penpos 9 (3b, -180);
  penpos 10 (b, -180);
  % Fix x coords of keypoints
  x1=0;
  x1.5=1/2[x1,x2];
  x5=x1=x3=x8;
  x10=1/2[x9,x1];
  x7=1/2[x3,x4];
  x4-x6=w;
  x1=1/2[x2,x4];
  x3-x2=x2-x6;
  x9=1/2[x1,x2];
  x6.5=1/2[x5,x6];
  % Fix y coords of keypoints
  y1=0;
  y1.5=y1;
  y6=y2=y4=1/2[y3,y1];
  y3-y1=y1-y5=1/10h;
  y5-y10=2(y3-y1);
  y8-y7=y3-y1;
  y9=y7;
  y8-y3=y3-y10;
  y6.5=1/2[y6,y7];
drawoptions (withcolor background);
  % Draw (an incomplete and ugly) treble clef
  penstroke z1e .. z1.5e .. z2e .. z3e .. z4e .. z5e .. z6e .. z6.5e ..
z7e .. z8e .. z9e .. z10e;
  drawoptions(withcolor black);
  labels.lft(1,1.5,2,3,4,5,6,6.5,7,8,9,10);
You must take special care never to cross the left and right edges of
the pen. See The METAFONTbook for details and examples.
Regards,
Nicola
...
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--
Best Regards
Chen
----------------------------------------------------------------
Zhi-chu Chen | Shanghai Synchrotron Radiation Facility
        No. 2019 | Jialuo Rd. | Jiading | Shanghai | P.R. China
            tel: 086 21 5955 3405 | zhichu.chen.googlepages.com
                                              | www.sinap.ac.cn
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___________________________________________________________________________________
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
___________________________________________________________________________________

Re: [NTG-context] How to "unfill" a picture?

Lutz Haseloff