Image:Go .png
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Go_.png (481 × 481 pixel, file size: 650 B, MIME type: image/png)
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A tile for constructing Go positions.
This tile is one of a set. An example Go board layout, using all of the images:
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There are also versions with red circles, for pointing out particular spots on the board, and stones with numbers:
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[edit] Sourcecode
To reproduce these images, save the following Metapost program as Go_template.mp:
scale=0.6in; % scale is the diameter of a stone
linethickness = scale/25;
pickup pencircle scaled linethickness;
num = 500; % Levels of shading in each stone.
lx = -0.35;
ly = 0.35;
lz = sqrt(1-lx*lx-ly*ly);
% light source direction vector.
% note that lz = cos(ltip).
ltheta = angle(lx, ly);
ltip = angle(lz, lx++ly);
% the angle at which the light source is tipped.
path ellipse;
ellipse := fullcircle scaled scale xscaled lz;
color boardcolor;
boardcolor = (0.86,0.70,0.36);
% Draw a black and a white stone:
picture blackstone;
blackstone = currentpicture;
addto blackstone contour fullcircle scaled scale;
picture whitestone;
whitestone = currentpicture;
basewhite = 0.7;
addto whitestone contour fullcircle scaled scale
withcolor (basewhite*white);
for ratio = 1 step -1/num until 0 :
path ourellipse;
ourellipse = ellipse scaled ratio
shifted (scale*(1+-+ratio)*sind(ltip)/2, 0)
rotated ltheta;
addto blackstone contour ourellipse withcolor (0.7*(1+-+ratio)**2*white);
addto whitestone contour ourellipse withcolor
(basewhite + (1-basewhite)*((1+-+ratio)**4))*white;
endfor;
def foo(expr fig) =
beginfig(fig);
pickup pencircle scaled linethickness;
fill unitsquare scaled scale shifted (-0.5scale,-0.5scale)
withcolor boardcolor;
linecap := butt;
bar;
endfig;
beginfig(fig+1);
pickup pencircle scaled linethickness;
fill unitsquare scaled scale shifted (-0.5scale,-0.5scale)
withcolor boardcolor;
linecap := butt;
bar;
pickup pencircle scaled (2*linethickness);
draw fullcircle scaled (scale/2) withcolor red;
endfig;
enddef;
def bar =
draw (0,-0.5scale)--(0,0)--(0.5scale,0);
enddef;
foo(1);
def bar =
draw (-0.5scale,0)--(0.5scale,0);
draw (0,-0.5scale)--(0,0);
enddef;
foo(3);
def bar =
draw (-0.5scale,0)--(0,0)--(0,-0.5scale);
enddef;
foo(5);
def bar =
draw (0,0.5scale)--(0,-0.5scale);
draw (-0.5scale,0)--(0,0);
enddef;
foo(7);
def bar =
draw (0,0.5scale)--(0,0)--(-0.5scale,0);
enddef;
foo(9);
def bar =
draw (0.5scale,0)--(-0.5scale,0);
draw (0,0.5scale)--(0,0);
enddef;
foo(11);
def bar =
draw (0.5scale,0)--(0,0)--(0,0.5scale);
enddef;
foo(13);
def bar =
draw (0,-0.5scale)--(0,0.5scale);
draw (0.5scale,0)--(0,0);
enddef;
foo(15);
def bar =
draw (-0.5scale,0)--(0.5scale,0);
draw (0,-0.5scale)--(0,0.5scale);
enddef;
foo(17);
def bar =
draw (-0.5scale,0)--(0.5scale,0);
draw (0,-0.5scale)--(0,0.5scale);
pickup pencircle scaled (2*linethickness);
draw (0,0);
enddef;
foo(19);
beginfig(21);
fill unitsquare scaled scale shifted (-0.5scale,-0.5scale)
withcolor boardcolor;
draw blackstone;
endfig;
beginfig(22);
fill unitsquare scaled scale shifted (-0.5scale,-0.5scale)
withcolor boardcolor;
draw whitestone;
endfig;
beginfig(23);
fill unitsquare scaled scale shifted (-0.5scale,-0.5scale)
withcolor boardcolor;
draw blackstone;
draw thelabel("1", (0,0)) scaled (0.75*scale/10pt)
withcolor white;
endfig;
beginfig(24);
fill unitsquare scaled scale shifted (-0.5scale,-0.5scale)
withcolor boardcolor;
draw whitestone;
draw thelabel("2", (0,0)) scaled (0.75*scale/10pt)
withcolor black;
endfig;
end;
and save the following as Go_template.tex:
\documentclass[10pt]{article}
\usepackage{graphicx}
\pagestyle{empty}
\begin{document}
\includegraphics{\fig}
\end{document}
Then run
mpost Go_template
for num in 23 24; do
latex "\def\fig{Go_template.$num} \input Go_template";
dvips -mode lwpro -D 800 Go_template.dvi -o Go_template.ps.$num;
mv -f Go_template.ps.$num Go_template.$num;
done
for name in Go_template.{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24}; do
convert -density 800 $name $name.pnm;
pnmcrop $name.pnm | pnmtopng > $name.png.uncrush;
pngcrush -reduce -brute -l 9 $name.png.uncrush $name.png;
rm -f $name $name.{pnm,png.uncrush};
done
David Benbennick made these images Friday, February 25, 2005.
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File links
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