Transferred from en.wikipedia to Commons by Maksim.
The original description page was
here. All following user names refer to en.wikipedia.
摘要
Made by myself with Matlab
授權條款
Public domainPublic domainfalsefalse
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我,此作品的版權所有人,釋出此作品至公共領域。此授權條款在全世界均適用。 這可能在某些國家不合法,如果是的話: 我授予任何人有權利使用此作品於任何用途,除受法律約束外,不受任何限制。
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Source code
function main ()
N=12; line_thickness=2.2; font_size=25; d=0.13; big_rad=10; ball_rad=0.5; ii=sqrt(-1);
red=[1, 0, 0]; green=[0, 1, 0]; blue=[0, 0, 1];
All=[red' green' blue'];
figure(1); clf; hold on; axis equal; axis off;
Theta=0:0.1:3*pi;
X=big_rad*cos(Theta);
Y=big_rad*sin(Theta);
plot(X, Y, 'linewidth', line_thickness, 'color', [0 0 0]);
for i=0:(N-1)
z=big_rad*exp(i*ii*2*pi/N);
place_text_smartly (z, font_size, i, d, sprintf('%d\\pi/%d', i, N/2), N);
color_ball(real(z), imag(z), ball_rad, All(:, mod(i, 3)+1)');
end
scale=1.4;plot(scale*big_rad, scale*big_rad)
scale=-1.4;plot(scale*big_rad, scale*big_rad)
saveas(gcf, 'Normal_subgroup_illustration.eps', 'psc2')
saveas(gcf, 'Normal_subgroup_illustration.png')
function place_text_smartly (z, font_size, pos, d, tx, N)
p=cos(2*pi/N)+sqrt(-1)*sin(2*pi/N);
z = z + p^pos * d * font_size;
shiftx=0.0003; shifty=0.03;
x = real (z); y=imag(z);
H=text(x+shiftx*font_size, y+shifty*font_size, tx);
set(H, 'fontsize', font_size, 'HorizontalAlignment', 'c', 'VerticalAlignment', 'c')
function color_ball(x, y, r, color)
Theta=0:0.1:2*pi;
X=r*cos(Theta)+x;
Y=r*sin(Theta)+y;
H=fill(X, Y, color);
set(H, 'EdgeColor', 'none');
date/time |
username |
edit summary
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13:19, 27 October 2005 |
en:User:Oleg Alexandrov |
(<span class="autocomment"><a href="/wiki/Image:Normal_subgroup_illustration.png#Source_code" title="Image:Normal subgroup illustration.png">→</a>Source code</span>)
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13:10, 27 October 2005 |
en:User:Oleg Alexandrov |
(<span class="autocomment"><a href="/wiki/Image:Normal_subgroup_illustration.png#Licensing" title="Image:Normal subgroup illustration.png">→</a>Licensing -</span> source code)
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12:42, 27 October 2005 |
en:User:Oleg Alexandrov |
(Made by myself with <a href="/wiki/Matlab" title="Matlab">Matlab</a>)
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原始上傳日誌
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