MetaFun - Pragma ADE

More documents

Recommendations

Info

234 Does it wor k ok? D o e s i t wor k o k ? A B C D o e s i t wor k o k ? The previous macro is not really an example of generalization, but we used it for demonstrating how to build graphics in a stepwise way. If you put the steps in buffers, you can even combine steps and replace them at will. This is how we made the previous step by step examples: We put each sub--graphic in a buffer and then called the ones we wanted. We now present a more general approach to typesetting along a given path. This method is not only more robust and general, it is also a more compact definition, especially if we omit the tracing and testing code. We use a familiar auxiliary definition. The \setstrut and \strut commands ensure that the lines have the proper depth and height. \def\processfollowingtoken#1% {\appendtoks#1\to\MPtoks \setbox\MPbox=\hbox{\RotFont\setstrut\strut\the\MPtoks}% \startMPdrawing n := n + 1 ; len[n] := \the\wd\MPbox ; \stopMPdrawing \startMPdrawing[-] pic[n] := btex \RotFont\setstrut\strut#1 etex ; pic[n] := pic[n] shifted -llcorner pic[n] ; \stopMPdrawing} The definition of \followtokens is as follows. Keep in mind that \RotFont is defined in the META POST environment. You may notice that we have added a directive to include the METAPOST graphic called followtokens. Storing the path in a graphic container instead of using \startMPdrawing is less sensitive for interference with other drawing processes. \def\followtokens#1% {\vbox\bgroup \MPtoks\emptytoks \resetMPdrawing \startMPdrawing \includeMPgraphic{followtokens} picture pic[] ; numeric len[], n ; n := 0 ; \stopMPdrawing \handletokens#1\with\processfollowingtoken \startMPdrawing numeric al, pl, at, wid, pos ; pair ap, ad ; al := arclength RotPath ; pl := (al-len[n])/(n-1) ; for i=1 upto n : wid := abs(xpart lrcorner pic[i] - xpart llcorner pic[i]) ; pos := len[i]-wid/2 + (i-1)*pl ; at := arctime pos of RotPath ; Typesetting in METAPOST TEX text
ap := point at of RotPath ; ad := direction at of RotPath ; draw pic[i] shifted (-wid/2,0) rotated (angle(ad)) shifted ap ; endfor ; \stopMPdrawing \MPdrawingdonetrue \getMPdrawing \resetMPdrawing \egroup} So, how does this compare to earlier results? The original, full text as typeset by TEX, looks like: We now follow some arbitrary path ... In the examples, the text is typeset along the path with: \followtokens{We now follow some arbitrary path ...} We now follow some arbitrary path ... Since we did not set a path, a dummy path is used. We can provide a path by (re)defining the graphic followtokens. \startuseMPgraphic{followtokens} path RotPath ; RotPath := fullcircle ; \stopuseMPgraphic We now follow some arbitrary path ... We now follow some arbitrary path ... \startuseMPgraphic{followtokens} path RotPath ; RotPath := reverse fullcircle ; \stopuseMPgraphic We now follow some arbitrary path ... \startuseMPgraphic{followtokens} path RotPath ; RotPath := (-3cm,-1cm)--(0,1cm)--(3cm,-1cm) ; \stopuseMPgraphic We now follow some arbitrary path ... TEX text Typesetting in METAPOST 235
Page 1:
Hans Hagen metafun context mkiv
Page 5 and 6:
Introduction This document is about
Page 7 and 8:
Content Conventions . . . . . . . .
Page 9 and 10:
1 Conventions When reading this man
Page 11 and 12:
1 Welcome to MetaPost 1.1 Paths 2 I
Page 13 and 14:
The open path is defined as: (1cm,1
Page 15 and 16:
1.2 Transformations We can store a
Page 17 and 18:
(x,y) zscaled (u,v) (xu − yv,xv +
Page 19 and 20:
z0 = (0.5cm,1.5cm) ; z1 = (2.5cm,2.
Page 21 and 22:
4 0 1 3 2 "z0..z1..z2..z3..z0" Only
Page 23 and 24:
0 1 3 2 "z0..z1..z2--z3" Watch how
Page 25 and 26:
0 1 0 2 2 1 "(z0..z1..z2..z3) cutaf
Page 27 and 28:
2 0 1 Using ( ) is not mandatory bu
Page 29 and 30:
0 4 1 3 2 0 These two graphics were
Page 31 and 32:
Since we don't consider this unfill
Page 33 and 34:
First there is the concept of varia
Page 35 and 36:
1.8 Loops Yet another programming c
Page 37 and 38:
If in the definition of doublescale
Page 39 and 40:
test (a) (b) (c) (d) ; test (a,b) (
Page 41 and 42:
If you forget about the colors, the
Page 43 and 44:
linejoin=mitered linecap=butt linej
Page 45 and 46:
1.15 Text Most dashpatterns can be
Page 47 and 48:
Z13 Z24 Z14 Z1 Z12 Z2 Z21 Z23 Z11 Z
Page 49 and 50:
3 Because we want to call this macr
Page 51 and 52:
dotlabel.rt ("$Z_{3}$", z3) ; dotla
Page 53 and 54:
A different approach is to use a tw
Page 55 and 56:
The graphic extends beyond the boun
Page 57 and 58:
p := (p shifted (5cm,0)) randomized
Page 59 and 60:
path p ; p := (0,0) -- (2cm,3cm) ;
Page 61 and 62:
path p ; p := (0cm,0cm) -- (4cm,1cm
Page 63 and 64:
Here, the image macro creates an (a
Page 65 and 66:
So, in addition to on to specify a
Page 67 and 68:
Watch how we can pass a point (poin
Page 69 and 70:
2 A few more details In this chapte
Page 71 and 72:
The second line does just as it say
Page 73 and 74:
fill shape ; draw shape ; filldraw
Page 75 and 76:
2.3 Units 6 As you can see here, as
Page 77 and 78:
2.4 Scaling and shifting When we dr
Page 79 and 80:
Especially when a path results from
Page 81 and 82:
points first order curve second ord
Page 83 and 84:
first iteration second iteration th
Page 85 and 86:
and get: We don't even need that mu
Page 87 and 88:
Figure 2.3 Circles with minimized i
Page 89 and 90:
The tension specifier can be used t
Page 91 and 92:
The asymetrical tensions are less p
Page 93 and 94:
z0 .. z1 .. z2 z0 {curl 1} .. z1 ..
Page 95 and 96:
7 In literature concerning POSTSCRI
Page 97 and 98:
currentpicture := currentpicture sl
Page 99 and 100:
We can achieve this by defining poi
Page 101 and 102:
We're still not there. Like in a pr
Page 103 and 104:
Due to the thicker line width used
Page 105 and 106:
left up down right The previous def
Page 107 and 108:
Here the & glues strings together,
Page 109 and 110:
picture p ; p := "MetaFun" normalin
Page 111 and 112:
pickup pencircle scaled 2pt ; draw
Page 113 and 114:
Because the z--variables are used f
Page 115 and 116:
3 Embedded graphics In addition to
Page 117 and 118:
\startMPcode fill fullcircle scaled
Page 119 and 120:
\startuniqueMPgraphic{right or wron
Page 121 and 122:
{\externalfigure[mprun:extrafun::my
Page 123 and 124:
\startlinecorrection[blank] \proces
Page 125 and 126:
In order to prevent problems, we ad
Page 127 and 128:
There are a few more low level swit
Page 129 and 130:
When we convert color to gray, we u
Page 131 and 132:
4 Enhancing the layout One of the m
Page 133 and 134:
4.2 Overlay variables [offset=3pt,f
Page 135 and 136:
This background demonstrates that a
Page 137 and 138:
As you may know, TEX's ambassador i
Page 139 and 140:
This works as expected: \RotatedTex
Page 141 and 142:
We will now apply this knowledge of
Page 143 and 144:
p := p shifted (2o,OverlayHeight-yp
Page 145 and 146:
We demonstrated that when defining
Page 147 and 148:
5 Positional graphics In this chapt
Page 149 and 150:
5.2 Anchors and layers In a previou
Page 151 and 152:
pab := pab cutafter (pab intersecti
Page 153 and 154:
fill p withcolor \MPcolor{lightgray
Page 155 and 156:
The previous example also demonstra
Page 157 and 158:
\setMPlayer [test] [somepos-1] [loc
Page 159 and 160:
6 Page backgrounds Especially in in
Page 161 and 162:
As soon as you want to make an elec
Page 163 and 164:
do_it (1,4,false) ; do_it (5,4,fals
Page 165 and 166:
gigigi Watch how the bounding boxes
Page 167 and 168:
You can test this concept yourself
Page 169 and 170:
StartPage ; fill Area[Text][Text] s
Page 171 and 172:
fi ; Main := Main enlarged 6pt ; pi
Page 173 and 174:
ulcorner Field[Text] [Text] -urcorn
Page 175 and 176:
The left picture demonstrates what
Page 177 and 178:
There are two more operators: inner
Page 179 and 180:
7 Shapes, symbols and buttons One c
Page 181 and 182:
Table 7.1 demonstrates how scratch
Page 183 and 184:
for i := 1 upto \MPvar{n} : xpos :=
Page 185 and 186:
This table is defined as: \bTABLE[f
Page 187 and 188: Since we have collected some nice b
Page 189 and 190: 8 Special effects Sometimes we want
Page 191 and 192: Because of this implementation, sha
Page 193 and 194: test_shade(origin shifted (.25cm,0)
Page 195 and 196: fill p shifted (3cm,0) withcolor .5
Page 197 and 198: \definecolor [tred] [r=1,t=.5,a=exc
Page 199 and 200: Figure 8.4 Another clipped cow. \pl
Page 201 and 202: withpen pencircle scaled 4mm withco
Page 203 and 204: Because this graphic is the result
Page 205 and 206: The resulting PDF file can be inclu
Page 207 and 208: Including another METAPOST graphic,
Page 209 and 210: After these examples your are proba
Page 211 and 212: In this graphic, we have two text f
Page 213 and 214: } {}} Here we feed some MATHML int
Page 215 and 216: 9 Functions METAPOST provides a wid
Page 217 and 218: 9.2 Grids Some day you may want to
Page 219 and 220: 13 13 13 13 Figure 9.1 Quick and di
Page 221 and 222: 2 − ×10 1 − 1 0×100 Figure 9.
Page 223 and 224: Figure 9.3 By using transparent col
Page 225 and 226: There are enough applications out t
Page 227 and 228: Of course we could extend this LUA
Page 229 and 230: 10 Typesetting in METAPOST It is sa
Page 231 and 232: Meta is a female lion! Figure 10.2
Page 233 and 234: We use the low level CONTEXT macro
Page 235 and 236: So, now we have: M etaPostisFun! Wh
Page 237: n := n + 1 ; len[n] := \the\wd\MPbo
Page 241 and 242: \startoverlay {\startuseMPgraphic{f
Page 243 and 244: \startuseMPgraphic{text draw} draw
Page 245 and 246: vsize := ypart urcorner p - ypart l
Page 247 and 248: We are now ready for an attempt to
Page 249 and 250: We can manipulate the heigth and de
Page 251 and 252: \strutheight) ; % height of first l
Page 253 and 254: w := h := 6cm ; o := 6pt ; path p ;
Page 255 and 256: Donald Knuth has spent the past sev
Page 257 and 258: Donald Knuth has spent the past sev
Page 259 and 260: 11 Debugging Those familiar with CO
Page 261 and 262: 4 3 5 2 6 1 0 7 8 You can pass opti
Page 263 and 264: 3 4 0 2 1 Of course you may want to
Page 265 and 266: 12 Defining styles Since the integr
Page 267 and 268: color=gray, contrastcolor=gray, sty
Page 269 and 270: def right_menu_button (expr nn, rr,
Page 271 and 272: \Topic {Edward R. Tufte} \input tuf
Page 273 and 274: A Few Nice Quotes A Simple Style De
Page 275 and 276: 13 A few applications For those who
Page 277 and 278: vardef spring (expr a, b, w, h, n)
Page 279 and 280: There is a numeric constant labelof
Page 281 and 282: text text text text text text text
Page 283 and 284: p := fullcircle scaled (2*length(lo
Page 285 and 286: These definitions of anglebetween a
Page 287 and 288: Because in most cases we want the l
Page 289 and 290:
γ δ β ɛ α ζ δ γ β ɛ metho
Page 291 and 292:
There are for sure more (efficient)
Page 293 and 294:
The next circle that we draw shows
Page 295 and 296:
popcurrentpicture ; enddef ; Here,
Page 297 and 298:
draw (u,i) -- (2u,i) withcolor .5wh
Page 299 and 300:
Figure 13.4 Koffka's examples of ma
Page 301 and 302:
\startbuffer[a] def start_everythin
Page 303 and 304:
pointC := circleA intersectionpoint
Page 305 and 306:
draw_basics ; draw_circles ; draw_i
Page 307 and 308:
Figure 13.6 Bisecting a line segmen
Page 309 and 310:
z1 = (0, height/2) ; z2 = (width/2-
Page 311 and 312:
The clipping path is applied by say
Page 313 and 314:
13.8 Music sheets The next example
Page 315 and 316:
The euro symbol A few applications
Page 317 and 318:
draw i withpen pencircle scaled 1pt
Page 319 and 320:
16 draw b withpen pencircle scaled
Page 321 and 322:
\startMPcode \includeMPgraphic{gamb
Page 323 and 324:
14 METAFUN macros CONTEXT comes wit
Page 325 and 326:
A METAPOST syntax In the METAFONT b
Page 327 and 328:
〈number or fraction〉 → 〈num
Page 329 and 330:
〈suffix〉 → 〈empty〉 | 〈s
Page 331 and 332:
〈assignment〉 → 〈variable〉
Page 333 and 334:
〈command〉 → clip 〈picture v
Page 335 and 336:
〈if test〉 → if 〈boolean exp
Page 337 and 338:
B This document This document is pr
Page 339 and 340:
C Reference C.1 Paths In this chapt
Page 341 and 342:
tension atleast numeric (0,0)..(.75
Page 343 and 344:
angle origin--dir(angle(1,1)) metap
Page 345 and 346:
circle bcircle metafun variable lci
Page 347 and 348:
path randomized numeric/pair unitsq
Page 349 and 350:
path stretched numeric/pair (fullci
Page 351 and 352:
path zscaled pair fullcircle zscale
Page 353 and 354:
path llenlarged numeric fullcircle
Page 355 and 356:
path urmoved numeric fullcircle urm
Page 357 and 358:
everse path reverse fullcircle shif
Page 359 and 360:
oundingbox path boundingbox fullcir
Page 361 and 362:
C.3 Points top pair top center full
Page 363 and 364:
C.4 Attributes withcolor rgbcolor w
Page 365 and 366:
draw draw fullcircle metapost macro
Page 367 and 368:
ounded linecap := rounded metapost
Page 369 and 370:
label.top label.top("MetaFun",origi
Page 371 and 372:
D Literature There is undoubtly mor
Page 373 and 374:
Index a anchoring 143, 145 angles 2
Page 376:
This document introduces you in the
show all

MetaFun - Pragma ADE

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?