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function machine
by David Arnold 28 Dec '05

28 Dec '05

Hans, Taco, et al, This is getting pretty close to the limit of my expertise. The good stuff of it is stolen from Metafun and mp-func.mp. Because of the way I handle clipping the path, p:=p cutbefore cpath; p:=reverse p; p:=p cutbefore cpath; this will only work on functions (like lines, quadratics, and polynomials, maybe sinusoids) that both enter and leave the region inside the clipping path. I proceed the in the order I do because I want the axes layered atop the grid and the functions layered atop the grid and axes. It's actually a pretty cool routine for teachers as it almost works like a TI83 calculator. Just change xmin, xmax, xscl, ymin, ymax, and yscl to determine domain and range and tick marks, then adjust the number of points for a smooth graph, then set the width of the figure you want. There's an option to label the axes differently from the usual x and y, if needed. Finally, thanks to Hans' expertise, the drawfcn routine allows for a parametric definition of the intended curve. All you need to do to make another graphic is copy and paste everything between \startMPpage ... \stopMPpage and adjust the parameters described above. Now you have a second plot. You can run texexec with texexec filename or texexec --page=2 filename if you only want your second graphic. When I compile all, I write an xml database file (very cool) and use \usemodule[fig-base] \usefigurebase[figures/figlibSection1] in my document. Very cool working arrangement. Here's some lines from my xml file: <figurelibrary language="en"> <description> <organization>College of the Redwoods Mathematics Department</ organization> <project>Intermediate Algebra Text</project> <product>Chapter 1</product> <comment>Figures for Section 1</comment> </description> <figure> <file>section1figs-mpgraph.1</file> <label>yeqx2</label> <copyright>College of the Redwoods Mathematics Department</copyright> <comment></comment> </figure> <figure> <file>section1figs-mpgraph.2</file> <label>yeq2x2</label> <copyright>College of the Redwoods Mathematics Department</copyright> <comment></comment> </figure> ... </figurelibrary> And here's my function machine. I'd love to hear any suggestions for improvement. Thanks to all who have helped me the last week (Taco has been especially patient). I've learned a lot. %output=pdf \setupcolors[state=start] \definecolor[gridlines][s=0.7] \startMPinclusions color gridlines; gridlines:=\MPcolor{gridlines}; vardef create_grid (expr l,r,h,b,t,v,wid,ht)= save ux, uy; numeric ux, uy; (r-l)*ux=wid; (t-b)*uy=ht; for k=b step v until t: draw (l*ux,k*uy)--(r*ux,k*uy) withcolor \MPcolor{gridlines}; endfor; for k=l step h until r: draw (k*ux,b*uy)--(k*ux,t*uy) withcolor \MPcolor{gridlines}; endfor; enddef; vardef create_axes (expr l,r,b,t,wid,ht) (text xlbl,ylbl) = save ux, uy; numeric ux, uy; (r-l)*ux=wid; (t-b)*uy=ht; textextoffset:=3pt; drawdblarrow (1.05*l*ux,0)--(1.05*r*ux,0); draw textext.rt(xlbl) shifted (1.05*r*ux,0); draw textext.bot(decimal r) shifted (r*ux,0); drawdblarrow (0,1.05*b*uy)--(0,1.05*t*uy); draw textext.top(ylbl) shifted (0,1.05*t*uy); draw textext.lft(decimal t) shifted (0,t*uy); enddef; vardef drawfcn (expr ind,dep,l,r,b,t,wid,ht,n) text txt = save x, dx, ux, uy; numeric x, dx, ux, uy; dx:=(r-l)/n; (r-l)*ux=wid; (t-b)*uy=ht; save cpath; path cpath; cpath:=(l,b)--(r,b)--(r,t)--(l,t)--cycle; save p; path p; hide (x:=l;) p:=(scantokens(ind),scantokens(dep)); for xx:=l step dx until r: hide (x:=xx;) p:=p--(scantokens(ind),scantokens(dep)); endfor; hide(x:=r;) p:=p--(scantokens(ind),scantokens(dep)); p:=p cutbefore cpath; p:=reverse p; p:=p cutbefore cpath; p:=p xyscaled (ux,uy); drawdblarrow p txt; enddef; \stopMPinclusions \starttext \startMPpage %initialize window parameters numeric xmin, xmax, xscl, ymin, ymax, yscl; xmin:=-10; xmax:=10; xscl:=1; ymin:=-10; ymax:=10; yscl:=1; %initialize number of points numeric num_points; num_points:=100; %initialize dimensions of image numeric width, height; width=3in; height=3in; %create the grid create_grid(xmin,xmax,xscl,ymin,ymax,yscl,width,height); %create the axes create_axes(xmin,xmax,ymin,ymax,width,height)("$x$")("$y$"); %draw the function %drawf(xmin,xmax,ymin,ymax,width,height,num_points); drawfcn("x","x*x",xmin,xmax,ymin,ymax,width,height,100) ; %to add another function with extra formatting, try: % drawfcn("x","(x+1)*(x+1)",xmin,xmax,ymin,ymax,width,height,100) % withpen pencircle scaled 2pt dashed evenly withcolor red; \stopMPpage \stoptext %%% Local Variables: %%% mode: conTeXt-en %%% End:

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textext funny error
by David Arnold 28 Dec '05

28 Dec '05

Hans, Taco, et al, I have a funny error involving textext. If I do two compiles of the following code, saved a junk6.tex, with: texexec junk6 texexec junk6 This produces a file junk6.pdf that looks as it should. However, if I compile the junk6-mpgraph.mp that is produced with the above runs, I get: (/usr/local/teTeX/share/texmf.local/metapost/context/base/mp-core.mp) >> unknown picture p >> textext.rt ! Equation cannot be performed (unknown picture=numeric). <to be read again> ( create_axes->...pt;save.p;picture.p;p:=textext.rt( (TEXT8));p:=p.shifted(1.05... l.148 ...max,ymin,ymax,width,height)("$x$")("$y$") ; ? Very perplexing. Any comments? Helpful corrections? Here's the file: %output=pdf \startMPinclusions vardef create_axes (expr l,r,b,t,wid,ht) (text xlbl,ylbl) = save ux, uy; numeric ux, uy; (r-l)*ux=wid; (t-b)*uy=ht; textextoffset:=3pt; save p; picture p; p:=textext.rt(xlbl); p:=p shifted (1.05*r*ux,0); save q; picture q; q:=textext.top(ylbl); q:=q shifted (0,1.05*t*uy); drawdblarrow (1.05*l*ux,0)--(1.05*r*ux,0); draw p; drawdblarrow (0,1.05*b*uy)--(0,1.05*t*uy); draw q; enddef; \stopMPinclusions \starttext \startMPpage %initialize window parameters numeric xmin, xmax, xscl, ymin, ymax, yscl; xmin:=-5; xmax:=5; xscl:=1; ymin:=-5; ymax:=5; yscl:=1; %initialize dimensions of image numeric width, height; width=3in; height=3in; %create the axes create_axes(xmin,xmax,ymin,ymax,width,height)("$x$")("$y$"); \stopMPpage \stoptext %%% Local Variables: %%% mode: conTeXt-en %%% End:

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accents in math
by Peter Münster 28 Dec '05

28 Dec '05

Hello, \enableregime[il1] \starttext This used to work once upon a time, but now the ö is not ok: $\hbox{löslich}$ This seems to be a workaround: $\displaystyle\text{löslich}$ \stoptext Bug or new feature? Cheers, Peter -- http://pmrb.free.fr/contact/

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problem with starttable and subscript
by Peter Münster 28 Dec '05

28 Dec '05

Hello, the problem with the following example is, that the last X touches the line. \starttext \starttable[|p(2em)|] \NC $X^X$ $X_X^-$ \NC\AR \HL \stoptable \stoptext TIA for any help! Greetings, Peter -- http://pmrb.free.fr/contact/

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start-stop consistency
by Gilles Grégoire 28 Dec '05

28 Dec '05

Hello, I was wondering why ConTeXt doesn't use a syntax like \startsomething \stopsomething for chapters, sections, etc. So I had a look on Google and found this: > At 03:46 PM 6/21/2002 +0200, Giuseppe Bilotta wrote: > > >one of the main features of both ConTeXt and LaTeX over plain TeX > >is their heavily "object-oriented" approach to source writing, > >giving a large set of useful tools to build well-structured > >documents. > > > >There is though one aspect which has not been addressed in either: > >structuring of the sections. One still uses \chapter, \section, > >\subsection etc to denote the start of any of these, while > >structured writing would call for \startchapter ... \stopchapter, > >\startsection ... \stopsection etc. > > > >My proposal is to switch to such a method, while still retaining > >compatibility with the old-style sectioning (maybe we can use some > >flag like the one used to left left/right alignment use the > >_correct_ term --what was the switch name?). > > actually, this is on my to do list, for most of the project that we run > currently we use this approach since it gives you the options > > (1) to skip a chapter / section > (2) to attach hooks to the end-of-some-section > > >How should it work: > > > >\startchapter[optional reference name] > > > >Possible stuff before the title (e.g. an epigraph) > > > >\title{Title of the chapter} > >Optional commands to set alternative forms of the title (see > >below) > > no, just \startchapter[ref]{title} is ok, since i don't want to pick up the > title separately (imagine that you want \startchapter to trigger a complex > title page > > also, we currently test (play with) some mechanism to have section (or > whatever) dependent variables, thereby introducing more convenient ways to > tune typo behaviour. > > * easy way to set different titles for ToCs, running heads, (PDF) > >bookmarks etc. Consider the following hierarchy of titles: > > > >title listtitle markingtitle bmtitle > > that's for variables (since here we also have things like several graphics > to be used in typesetting the chapter page) > > >write anything to the .tuo file; this ought to be done by the > >\stop<section-name> command, which would save all of them together > >with the appropriate counter values and beginning/ending page. > > hm, i'm not sure if i like that > > >* easy way to put things before the title (e.g. an epigraph) while > >still within the structure of the section. > > > >* also comes from the above: currently, when using the /XYZ method > >for PDF references, link targets end out-of-the-window because the > >TeX cohordinate used is that of the baseline. This means that the > >visible part of the page does not include the target reference > >(which is rather uncomfortable). Instead, with the new approach > >the mark could be set "right before everything else, but still > >within the correct structure", with optimal PDF navigation. > > that is a whole different matter, (1) output format/driver dependent and > (2) can handled now by moving things around and (3) we don't want those > funny nodes to screw up the spacing [actually, since i never use that xyz > way of viewing docs [too inconstent auto scaling in viewers] i never felt > the need to look into it; maybe something for a cold winter night] > > >Hans, do you think you can implement this easily? > > the \start-\stop thing will certainly be there I see you planned to include the \start-\stop thing in ConTeXt, I even understand that you already implemented this method. Did you change your mind or is it something you just don't have time to do? Would it be possible to retrieve the macro you use? I think this kind of feature would really be an improvement since it allows to learn faster. Thanks a lot. -- Gilles Grégoire -- Gilles Grégoire

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byte order marks in utf-8 (old)
by Taco Hoekwater 28 Dec '05

28 Dec '05

Hi, A long time ago, Hans wrote: > Patrick Gundlach wrote: > >> are you sure that your scite does not use utf-16 and puts the BOM (byte >> order mark) there? > > scite indeed does this (kind of annoying) It is the BOM, in utf-8 file encoding. A bit pointless (utf-8 is based on opcodes instead of byte ordering), but is allowed by the unicode specification. > context can handle that for xml files > > i can consider handling it automatically (i.e. when BOM before first start-stop, > then assume utf-8) It is a safe bet that any document that starts with the three bytes 0xEF 0xBB 0xBF is encoded as UTF-8, esp. if it is supposed to be text input. Cheers, Taco

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expert font access
by Henning Hraban Ramm 28 Dec '05

28 Dec '05

Ahoi! One decorative font that I use contains some additional (swashed etc.) characters. At the moment I access them like this: \def\DelitschC#1{\getglyph{\defaultencoding-raw-delitschantiqua} {\char#1}} \definetextmodediscretionary A {\DelitschC{197}} So I get the alternative A as |A|, and that's enough for me. But in this way |A| always takes this character from the same font. How could I solve this more generally, two cases: 1. if several fonts use the same "expert" encoding 2. if I change the font, I'd like to get a simple A instead of |A| At the moment I need (2.), because I'd like to use something like \chapter{|A|nfang}; that's ok with my definition of chapter style=\hw (Delitsch font being defined as handwriting), but not in the ToC (rm font). Further (don't know how different), how could I define "take this special character always at the end/beginning of a word" or the like, e.g. how could I enable the different 's' of gothic fonts? Another one: How can I define additional ligatures, e.g. if my font provides a "Qu" or some other unusual ligature? Grüßlis vom Hraban! --- http://www.fiee.net/texnique/ http://contextgarden.net http://www.cacert.org (I'm an assurer)

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description question (bis)
by VnPenguin 27 Dec '05

27 Dec '05

Hi, I have another question about description list : How to make description list with idented text, not header ? Example: This is header This is the text of description. This is the text of description. This is the text of description. This is the text of description. This is the text of description. This is the text of description. Thank you in advance, Cheers, -- http://vnoss.org Vietnamese Open Source Software Community

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more font packages
by Henning Hraban Ramm 27 Dec '05

27 Dec '05

Here's a present for you: http://www.fiee.net/texnique/?menu=0-1-4 I made some more font packages and also published some symbol packages (Apostrophe HardTalk, FontShop FFDingbests, Klein RudolfsBats and my own Unitas2). The additional files of the newer packages are finally in the right places (docs/fonts/... and tex/context/third) I'll think about a better structure of the page including preview pictures... Merry Christmas (or whatever)! Grüßlis vom Hraban! --- http://www.fiee.net/texnique/ http://contextgarden.net http://www.cacert.org (I'm an assurer)

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hlingrid text t parameter?
by David Arnold 27 Dec '05

27 Dec '05

All, In mp-grid.mp, I find this definition: def hlingrid (expr Min, Max, Step, Length, Width) text t = image ( for i=Min step Step until Max+grid_eps : draw (origin--(Width,0)) shifted (0,i*(Length/Max)) t ; endfor ; ) ; enddef ; See the text t at the end of the first line? Can someone tell me what that does and can I have a small example of its use? Thanks.

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