MetaFun - Pragma ADE

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202 fill fullcircle scaled 2cm withcolor yellow ; fill fullcircle scaled 2cm shifted (3cm,0) withcolor red ; The yellow and red color do not match the main document colors, but this is no problem: we can remap them, without spoiling the original definition. fill fullcircle scaled 2cm withcolor yellow ; fill fullcircle scaled 2cm shifted (3cm,0) withcolor red ; remapcolor(yellow,.625yellow) ; remapcolor(red ,.625red) ; recolor currentpicture ; resetcolormap ; We can combine the inclusion technique with remapping colors. This time using an artist impression of one of Hasselts Canals (gracht in Dutch). loadfigure "gracht.mp" number 1 scaled .5 ; If you think that the sky is too bright in this picture, and given that you also know which color is used, you can fool the reader by remapping a few colors. loadfigure "gracht.mp" number 1 scaled .5 ; color skycolor ; skycolor := (0.8,0.90,1.0) ; color watercolor ; watercolor := (0.9,0.95,1.0) ; remapcolor(skycolor ,.8skycolor ) ; remapcolor(watercolor,.8watercolor) ; recolor currentpicture ; resetcolormap ; Special effects Changing colors
Including another METAPOST graphic, refilling, redrawing, and recoloring are all relatively simple features that use no real tricks. Opposite to the next feature, which is implemented using the METAPOST special driver that comes with CONTEXT. METAPOST is not really meant for manipulating graphics, but the previous examples demonstrated that we have some control over individual colors. In the next series of examples we will treat the picture as a whole. First we invert the colors using inverted. loadfigure "gracht.mp" number 1 scaled .5 ; addto currentpicture also inverted currentpicture shifted (bbwidth(currentpicture)+.5cm,0) ; This is a special case of uncolored. In the next example we explicitly specify the color. loadfigure "gracht.mp" number 1 scaled .5 ; addto currentpicture also (currentpicture uncolored green) shifted (bbwidth(currentpicture)+.5cm,0) ; You can also multiply each color using softened. In the next sample, the colors have 80% of their value. Changing colors Special effects 203
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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
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
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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: The resulting PDF file can be inclu
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 and 238: n := n + 1 ; len[n] := \the\wd\MPbo
Page 239 and 240: ap := point at of RotPath ; ad := d
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
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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
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def right_menu_button (expr nn, rr,
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\Topic {Edward R. Tufte} \input tuf
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A Few Nice Quotes A Simple Style De
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13 A few applications For those who
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vardef spring (expr a, b, w, h, n)
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There is a numeric constant labelof
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text text text text text text text
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p := fullcircle scaled (2*length(lo
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These definitions of anglebetween a
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Because in most cases we want the l
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γ δ β ɛ α ζ δ γ β ɛ metho
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There are for sure more (efficient)
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The next circle that we draw shows
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popcurrentpicture ; enddef ; Here,
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draw (u,i) -- (2u,i) withcolor .5wh
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Figure 13.4 Koffka's examples of ma
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\startbuffer[a] def start_everythin
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pointC := circleA intersectionpoint
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draw_basics ; draw_circles ; draw_i
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Figure 13.6 Bisecting a line segmen
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z1 = (0, height/2) ; z2 = (width/2-
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The clipping path is applied by say
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13.8 Music sheets The next example
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The euro symbol A few applications
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draw i withpen pencircle scaled 1pt
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16 draw b withpen pencircle scaled
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\startMPcode \includeMPgraphic{gamb
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14 METAFUN macros CONTEXT comes wit
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A METAPOST syntax In the METAFONT b
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〈number or fraction〉 → 〈num
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〈suffix〉 → 〈empty〉 | 〈s
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〈assignment〉 → 〈variable〉
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〈command〉 → clip 〈picture v
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〈if test〉 → if 〈boolean exp
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B This document This document is pr
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C Reference C.1 Paths In this chapt
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tension atleast numeric (0,0)..(.75
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angle origin--dir(angle(1,1)) metap
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circle bcircle metafun variable lci
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path randomized numeric/pair unitsq
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path stretched numeric/pair (fullci
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path zscaled pair fullcircle zscale
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path llenlarged numeric fullcircle
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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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