Re: [NTG-context] METAPOST -- specifying an unknown point coordinate by giving the angle from another known point

Ah, lovely! Who knew there would be so many different solutions? I'm going to use Nicola's solution on this occasion, as it fits my thought process best -- but thanks to Troy as your solutions showed me some other things I didn't know. All the best, James On Fri, Feb 26, 2010 at 9:42 PM, Nicola wrote:

In article <771da05a1002251718l55669a0co770b5a78bed84e4b@mail.gmail.com>,  James Fisher wrote:

...

This isn't specifically a ConTeXt question, but via it I've run into a seemingly simple problem in METAPOST that I just can't solve.  I'm trying to draw a parallelogram by specifying: (1) the length of sides parallel to the x-axis; (2) the total height of the figure; (3) one of the interior angles.

Curiously enough, nobody has posted a solution that uses 'whatever', so here it is:

z0 = origin;        % bottom left z1 = (5,0);         % bottom right y3 = y2 = 10; z3 = z0 + whatever*dir(87); % z3 is obtained by starting at z0 and                            % moving along dir(87) z2-z1 = whatever*(z3-z0);   % The line z1--z2 is parallel to z0--z3

That is, what you were trying to achieve:

angle(z3-z0) = dir(87);

can be written instead:

z3 - z0 = whatever*dir(87);

Nicola

___________________________________________________________________________________ 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  : http://foundry.supelec.fr/projects/contextrev/ wiki     : http://contextgarden.net ___________________________________________________________________________________