MetaFun - Pragma ADE

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302 A B A B A B A few applications Growing graphics C D C A B D C A M B step 1 step 2 step 3 step 4 step 5 Figure 13.5 The five graphics, each with the same bounding box. \definesymbol[step 3][{\processMPbuffer[a,b,c,d,e,f,g,3]}] \definesymbol[step 4][{\processMPbuffer[a,b,c,d,e,f,g,4]}] \definesymbol[step 5][{\processMPbuffer[a,b,c,d,e,f,g,5]}] A field stack is a sequence of overlayed graphics. We will arrange these to cycle manually, with clicks of the mouse, through the sequence of graphs depicting the construction of the midpoint of segment A − B. So, in fact we are dealing with a manual simulation. The definition of such a stack is as follows: \definefieldstack [midpoint construction] [step 1, step 2, step 3, step 4, step 5] [frame=on,offset=3pt,framecolor=darkyellow,rulethickness=1pt] The first argument is to be a unique identifier, the second argument takes a list of symbols, while the third argument accepts settings. More on this command can be found in the CONTEXT manuals. The stack is shown as figure 13.6. Its caption provides a button, which enables the reader to cycle through the stack. We call this a stack because the graphics are positioned on top of each other. Only one of them is visible at any time. \placefigure [here][fig:steps] {Bisecting a line segment with compass and straightedge? Just click \goto {here} [JS(Walk_Field{midpoint construction})] to walk through the construction! (This stack is only visible in a \PDF\ viewer that supports widgets.)} {\fieldstack[midpoint construction]} At the start of this section, we mentioned three methods. When we use the first method of putting all the graphics in an external METAPOST file, the following framework suits. We assume that the file is called step.mp and that it is kept by the user along with his document source. We start with the definitions of the graphic steps. These are the same as the ones shown previously. def draw_basics = ... enddef ; def draw_circles = ... enddef ; def draw_intersection = ... enddef ; def draw_bisector = ... enddef ; def draw_midpoint = ... enddef ; def stand_out = ... enddef ; We can safe some code by letting the ..._everything take care of the beginfig and endfig macros. D
Figure 13.6 Bisecting a line segment with compass and straightedge? Just click here to walk through the construction! (This stack is only visible in a PDF viewer that supports widgets.) def start_everything (expr n) = beginfig(n) ; ... enddef ; def stop_everything = ... ; endfig ; enddef ; The five graphics now become: start_everything (1) ; stand_out ; draw_basics ; stop_everything ; start_everything (2) ; draw_basics ; stand_out ; draw_circles ; stop_everything ; start_everything (3) ; draw_basics ; draw_circles ; stand_out ; draw_intersection ; stop_everything ; start_everything (4) ; draw_basics ; draw_circles ; draw_intersection ; stand_out ; draw_bisector ; stop_everything ; start_everything (5) ; draw_basics ; draw_circles ; draw_intersection ; draw_bisector ; stand_out ; draw_midpoint ; stop_everything ; The definitions of the symbols now refer to an external figure. \definesymbol[step 1][{\externalfigure[step.1]}] \definesymbol[step 2][{\externalfigure[step.2]}] \definesymbol[step 3][{\externalfigure[step.3]}] \definesymbol[step 4][{\externalfigure[step.4]}] \definesymbol[step 5][{\externalfigure[step.5]}] Growing graphics A few applications 303
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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 ;
Page 255 and 256: Donald Knuth has spent the past sev
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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
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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: draw_basics ; draw_circles ; draw_i
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
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everse path reverse fullcircle shif
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oundingbox path boundingbox fullcir
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C.3 Points top pair top center full
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C.4 Attributes withcolor rgbcolor w
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draw draw fullcircle metapost macro
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ounded linecap := rounded metapost
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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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