% Freely adapted from Escher's drawing 73 % From: Doris Schattschneider % M.C. Escher % Visions of Symmetry % W.H. Freeman and Company % New York % ISBN: 0-7167-2126-0 mpgraph:=1; input mp-tool; prologues:=2;beginfig(1); pickup pencircle scaled 1; pair p[], xshift, yshift, origin, offset; path line[], fish, drawing; color WHITE, GREY, C[]; WHITE = (1,1,1); GREY = 0.85(1.0,1.0,1.0); width = 279.4mm; height = 215.9mm; s := 0.055; p1 = (4905,9000-2925); p2 = (1215,9000-4890); p3 = (4890,9000-8985); p4 = (4770,9000-4155); p5 = (4380,9000-5130); p6 = (3840,9000-5040); p7 = (2940,9000-4590); p8 = (2025,9000-4515); p9 = (1935,9000-5295); p10 = (2445,9000-5925); p11 = (2835,9000-6780); p12 = (3225,9000-7425); p13 = (2160,9000-8115); p14 = (1455,9000-9240); p15 = (3225,9000-9750); p16 = (3210,9000-9735); line1 = (p1..p4..p5) shifted -p1; line2 = (p5..p6..p7..p8..p2) shifted -p1; line3 = (p2..p9..p10..p11..p12) shifted -p1; line4 = (p12..p13..p14) shifted -p1; line5 = (p14..p15..p3) shifted -p1; line6 = (p5..p4..p1) shifted -p1; line7 = (p2..p8..p7..p6..p5) shifted -p1; line8 = (p12..p11..p10..p9..p2) shifted -p1; line9 = (p14..p13..p12) shifted -p1; line10 = (p3 ..p15..p14) shifted -p1; fish = line1--line2--line3--line4--line5-- line7 shifted (p3 - p2)-- line6 shifted (p3 - p2)-- line10 shifted (p1 - p2)-- line9 shifted (p1 - p2)-- line8 shifted (p1 - p2)--cycle; p17 = (2880,9000-9750); p18 = (2370,9000-9720); p19 = (2055,9000-9585); p20 = (1605,9000-9360); p22 = (2355,9000-9540); p23 = (2700,9000-9490); p24 = (2820,9000-9540); p25 = (2910,9000-9225); p26 = (3075,9000-8880); p27 = (3300,9000-8640); p28 = (3420,9000-8400); p29 = (3420,9000-8175); p30 = (3375,9000-8025); p31 = (3450,9000-8340); p32 = (3420,9000-8820); p33 = (3300,9000-9225); p34 = (3000,9000-9645); p35 = (1935,9000-9270); p36 = (2385,9000-9225); p37 = (2775,9000-9060); p38 = (3030,9000-8895); p39 = (3000,9000-9105); p40 = (2865,9000-9300); p41 = (2820,9000-9585); p42 = (2820,9000-9570); p43 = (3885,9000-5205); p44 = (4005,9000-5565); p45 = (3990,9000-5880); p46 = (3045,9000-4725); p47 = (3405,9000-5580); p48 = (3555,9000-6270); p49 = (3795,9000-7035); p50 = (2115,9000-4605); p51 = (2595,9000-5190); p52 = (3015,9000-6015); p53 = (3300,9000-6720); p54 = (3510,9000-7230); p55 = (4185,9000-5490); p56 = (3855,9000-6360); p57 = (3765,9000-7320); p58 = (3825,9000-7620); p59 = (4200,9000-7670); p60 = (4455,9000-7670); p61 = (4770,9000-7750); p62 = (5040,9000-7890); p63 = (5040,9000-7605); p64 = (4080,9000-7350); p65 = (4170,9000-6705); p66 = (4350,9000-6120); p67 = (4665,9000-5505); p68 = (5130,9000-4725); p69 = (5625,9000-3660); p70 = (4440,9000-7320); p71 = (4515,9000-6825); p72 = (4875,9000-6060); p73 = (5430,9000-5220); p74 = (6120,9000-4320); p75 = (4740,9000-7605); p76 = (4845,9000-7005); p77 = (5205,9000-6240); p78 = (5850,9000-5460); p79 = (6405,9000-5040); p80 = (6945,9000-7935); p81 = (7215,9000-8100); p82 = (7440,9000-8340); p83 = (7065,9000-8595); p84 = (6705,9000-8650); p85 = (7890,9000-8085); p86 = (8355,9000-7905); p87 = (7800,9000-8445); p88 = (8235,9000-8430); p89 = (7575,9000-8835); p90 = (8055,9000-8880); p91 = (3210,9000-7680); p92 = (3285,9000-7650); p93 = (3375,9000-7635); p94 = (3540,9000-7710); p95 = (3825,9000-7995); p96 = (3990,9000-8370); p97 = (3990,9000-8790); p98 = (3885,9000-9150); p99 = (3765,9000-9345); p100 = (2775,9000-8325); line11 = (p17..p18..p19..p20..p14) shifted -p1; line12 = (p19..p22..p23) shifted -p1; line13 = (p17..p24..p25..p26..p27..p28..p29..p30) shifted -p1; line14 = (p30..p31..p32..p33..p34..p17) shifted -p1; line15 = (p14..p35..p36..p37..p38-- p38..p25..p24..p17-- p17..p18..p19..p20..p14-- cycle) shifted -p1; line16 = (p43..p44..p45) shifted -p1; line17 = (p46..p47..p48..p49) shifted -p1; line18 = (p50..p51..p52..p53..p54) shifted -p1; line19 = (p1..p4..p5..p55..p45..p56..p49..p57..p58) shifted -p1; line20 = (p12..(p54-(0,110))..p57) shifted -p1; line21 = (p58..p59..p60..p61..p62) shifted - p1; line22 = (p62..p63..p14+p1 - p2) shifted -p1; line23 = (p59..p64..p65..p66..p67..p68..p69) shifted -p1; line24 = (p60..p70..p71..p72..p73..p74) shifted -p1; line25 = (p61..p75..p76..p77..p78..p79) shifted -p1; line26 = (p80..p81..p82) shifted -p1; line27 = (p82..p83..p84) shifted -p1; line28 = (p81..p85..p86) shifted -p1; line29 = (p82..p87..p88) shifted -p1; line30 = (p83..p89..p90) shifted -p1; line31 = (p91..p92..p93..p94..p95..p96..p97..p98..p99) shifted -p1; line32 = (p100+(300,0).. p100+(0,-300).. p100-(300,0).. p100+(300,0)-- cycle) shifted -p1; line33 = (p100+200*(0.5,0.87)-- p100-- p100+(200,0).. p100+(0,-200).. p100-(200,0).. p100+200*(0.5,0.87)-- cycle) shifted -p1; origin = (10cm,10cm); xshift = (p1 + p3 - 2p2) scaled s; yshift = (p1 - p2) scaled s; C[1] = WHITE; C[2] = GREY; c := 1; xmin = -2; xmax = 2; ymin = -2; ymax = 5; for y=ymin upto ymax: for x=xmin upto xmax: offset := origin + x*xshift + y*yshift; fill fish scaled s shifted offset withcolor C[c]; fill line15 scaled s shifted offset withcolor C[3-c]; fill line33 scaled s shifted offset withcolor C[3-c]; endfor; c := 3 - c; endfor; c := 1; pickup pencircle scaled 2pt; for y=ymin upto ymax: for x=xmin upto xmax: offset := origin + x*xshift + y*yshift; draw line11 scaled s shifted offset withcolor C[c]; draw line12 scaled s shifted offset withcolor C[c]; for i=13 upto 14: draw line[i] scaled s shifted offset withcolor C[3-c]; endfor; for i=16 upto 32: draw line[i] scaled s shifted offset withcolor C[3-c]; endfor; endfor; c := 3 - c; endfor; % pickup pencircle scaled 1; draw(0,0)--(width,0)--(width,height)--(0,height)--cycle withcolor (0,0,0); drawing = unitsquare xscaled width yscaled height; clip currentpicture to drawing; draw drawing; endfig; end