MetaFun - Pragma ADE

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316 \startMPcode \includeMPgraphic{gamble} ; Gamble(120, aa {(0,1)} .. bb) ; \stopMPcode According to METAPOST, when we leave the Earth straight upwards and want a smooth trajectory, we have to pass through outer space. \startMPcode \includeMPgraphic{gamble} ; Gamble(120,aa {(1,0)} .. bb) ; \stopMPcode Given that we want a smooth path as well as a short journey, we can best follow Mars' path. Here we face the risk that when we travel slower than Mars does, we have a problem. \startMPcode \includeMPgraphic{gamble} ; Gamble(120,aa {dir 90} .. {precontrol 0 of b rotated 90} bb) ; \stopMPcode We can even travel a shorter path when we leave Earth at the surface that faces the point of arrival. A few applications Killing time
\startMPcode \includeMPgraphic{gamble} ; Gamble(120,aa .. {precontrol 0 of b rotated 90} bb) ; \stopMPcode In the end we decide that although the trajectories look impressive, we will not trust our lives to METAPOST. A beautiful path is not neccessarily a good path. But even then, this macro provides a nice way to experiment with directions, controls and tensions. Killing time A few applications 317
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Hans Hagen metafun context mkiv
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Introduction This document is about
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Content Conventions . . . . . . . .
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1 Conventions When reading this man
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1 Welcome to MetaPost 1.1 Paths 2 I
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The open path is defined as: (1cm,1
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1.2 Transformations We can store a
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(x,y) zscaled (u,v) (xu − yv,xv +
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z0 = (0.5cm,1.5cm) ; z1 = (2.5cm,2.
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4 0 1 3 2 "z0..z1..z2..z3..z0" Only
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0 1 3 2 "z0..z1..z2--z3" Watch how
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0 1 0 2 2 1 "(z0..z1..z2..z3) cutaf
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2 0 1 Using ( ) is not mandatory bu
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0 4 1 3 2 0 These two graphics were
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Since we don't consider this unfill
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First there is the concept of varia
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1.8 Loops Yet another programming c
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If in the definition of doublescale
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test (a) (b) (c) (d) ; test (a,b) (
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If you forget about the colors, the
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linejoin=mitered linecap=butt linej
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1.15 Text Most dashpatterns can be
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Z13 Z24 Z14 Z1 Z12 Z2 Z21 Z23 Z11 Z
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3 Because we want to call this macr
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dotlabel.rt ("$Z_{3}$", z3) ; dotla
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A different approach is to use a tw
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The graphic extends beyond the boun
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p := (p shifted (5cm,0)) randomized
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path p ; p := (0,0) -- (2cm,3cm) ;
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path p ; p := (0cm,0cm) -- (4cm,1cm
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Here, the image macro creates an (a
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So, in addition to on to specify a
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Watch how we can pass a point (poin
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2 A few more details In this chapte
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The second line does just as it say
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fill shape ; draw shape ; filldraw
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2.3 Units 6 As you can see here, as
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2.4 Scaling and shifting When we dr
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Especially when a path results from
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points first order curve second ord
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first iteration second iteration th
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and get: We don't even need that mu
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Figure 2.3 Circles with minimized i
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The tension specifier can be used t
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The asymetrical tensions are less p
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z0 .. z1 .. z2 z0 {curl 1} .. z1 ..
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7 In literature concerning POSTSCRI
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currentpicture := currentpicture sl
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We can achieve this by defining poi
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We're still not there. Like in a pr
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Due to the thicker line width used
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left up down right The previous def
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Here the & glues strings together,
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picture p ; p := "MetaFun" normalin
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pickup pencircle scaled 2pt ; draw
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Because the z--variables are used f
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3 Embedded graphics In addition to
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\startMPcode fill fullcircle scaled
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\startuniqueMPgraphic{right or wron
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{\externalfigure[mprun:extrafun::my
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\startlinecorrection[blank] \proces
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In order to prevent problems, we ad
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There are a few more low level swit
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When we convert color to gray, we u
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4 Enhancing the layout One of the m
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4.2 Overlay variables [offset=3pt,f
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This background demonstrates that a
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As you may know, TEX's ambassador i
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This works as expected: \RotatedTex
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We will now apply this knowledge of
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p := p shifted (2o,OverlayHeight-yp
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We demonstrated that when defining
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5 Positional graphics In this chapt
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5.2 Anchors and layers In a previou
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pab := pab cutafter (pab intersecti
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fill p withcolor \MPcolor{lightgray
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The previous example also demonstra
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\setMPlayer [test] [somepos-1] [loc
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6 Page backgrounds Especially in in
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As soon as you want to make an elec
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do_it (1,4,false) ; do_it (5,4,fals
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gigigi Watch how the bounding boxes
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You can test this concept yourself
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StartPage ; fill Area[Text][Text] s
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fi ; Main := Main enlarged 6pt ; pi
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ulcorner Field[Text] [Text] -urcorn
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The left picture demonstrates what
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There are two more operators: inner
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7 Shapes, symbols and buttons One c
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Table 7.1 demonstrates how scratch
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for i := 1 upto \MPvar{n} : xpos :=
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This table is defined as: \bTABLE[f
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Since we have collected some nice b
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8 Special effects Sometimes we want
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Because of this implementation, sha
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test_shade(origin shifted (.25cm,0)
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fill p shifted (3cm,0) withcolor .5
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\definecolor [tred] [r=1,t=.5,a=exc
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Figure 8.4 Another clipped cow. \pl
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withpen pencircle scaled 4mm withco
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Because this graphic is the result
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The resulting PDF file can be inclu
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Including another METAPOST graphic,
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After these examples your are proba
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In this graphic, we have two text f
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} {}} Here we feed some MATHML int
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9 Functions METAPOST provides a wid
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9.2 Grids Some day you may want to
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13 13 13 13 Figure 9.1 Quick and di
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2 − ×10 1 − 1 0×100 Figure 9.
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Figure 9.3 By using transparent col
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There are enough applications out t
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Of course we could extend this LUA
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10 Typesetting in METAPOST It is sa
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Meta is a female lion! Figure 10.2
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We use the low level CONTEXT macro
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So, now we have: M etaPostisFun! Wh
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n := n + 1 ; len[n] := \the\wd\MPbo
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ap := point at of RotPath ; ad := d
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\startoverlay {\startuseMPgraphic{f
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\startuseMPgraphic{text draw} draw
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vsize := ypart urcorner p - ypart l
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We are now ready for an attempt to
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We can manipulate the heigth and de
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\strutheight) ; % height of first l
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w := h := 6cm ; o := 6pt ; path p ;
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Donald Knuth has spent the past sev
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Donald Knuth has spent the past sev
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11 Debugging Those familiar with CO
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4 3 5 2 6 1 0 7 8 You can pass opti
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3 4 0 2 1 Of course you may want to
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12 Defining styles Since the integr
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color=gray, contrastcolor=gray, sty
Page 269 and 270: def right_menu_button (expr nn, rr,
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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
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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: 16 draw b withpen pencircle scaled
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
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D Literature There is undoubtly mor
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Index a anchoring 143, 145 angles 2
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This document introduces you in the
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MetaFun - Pragma ADE

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