我，本作品著作权人，释出本作品至公有领域。这适用于全世界。 在一些国家这可能不合法；如果是这样的话，那么： 我无条件地授予任何人以任何目的使用本作品的权利，除非这些条件是法律规定所必需的。

The picture was done in Matlab, with source code below. The conversion from eps to png format was done with the Unix command convert:

convert -antialias -density 400x400 -scale 10% Heronian_trig.eps Heronian_trig.png

function main ()

%prepare the screen
figure(1); clf; hold on; axis equal; axis off;

% points to graph
P=[-12, 0]; Q=[0, 0]; R=[32, 0]; S=[0, 24];

% text fontsize, line thickness, distance from text to graphics
fs=30; thick=3; dist=fs*0.1;

or=1; % to which side of a given segment the text should go

% draw the segments
side(P, Q, or, thick, dist, fs, 'b')
side(Q, R, or, thick, dist, fs, 'd')
side(R, S, or, thick, dist, fs, 'e')
side(S, P, or, thick, dist, fs, 'c')
side(S, Q, -or, thick, dist, fs, 'a')

% save as eps.
saveas(gcf, 'Heronian_trig.eps', 'psc2');

% Use later the command
% convert -antialias -density 400x400 -scale 10% Heronian_trig.eps Heronian_trig.png
% to convert to PNG. This keeps small size but good detail.

% a function to draw a segment and put some text a bit to a side of it.
function side(P, Q, or, thick, dist, fs, name)

 plot([P(1) Q(1)], [P(2), Q(2)], 'linewidth', thick);

 v=[(Q(2)-P(2)), -(Q(1)-P(1))]; % PQ rotated by 90 deg clockwise

 if or < 0
  v=-v; % change orientation
 end

 R=(P+Q)/2+dist*v/max(abs(v));
 H=text(R(1), R(2), name);
 set(H, 'fontsize', fs, 'VerticalAlignment', 'c', 'HorizontalAlignment', 'c')

Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version.

Click on date to download the file or see the image uploaded on that date.

• (del) (cur) 23:38, 12 September 2005 . . en:User:Oleg_Alexandrov Oleg Alexandrov ( en:User_talk:Oleg_Alexandrov Talk) . . 214x151 (4747 bytes)

File:Triangle-heronian.svg是此文件的矢量版本。 如果此文件质量不低于原点阵图，就应该将这个PNG格式文件替换为此文件。 File:Heronian trig.png → File:Triangle-heronian.svg 更多信息请参阅Help:SVG/zh。 其他语言 Alemannisch ∙ Bahasa Indonesia ∙ Bahasa Melayu ∙ British English ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ eesti ∙ English ∙ español ∙ Esperanto ∙ euskara ∙ français ∙ Frysk ∙ galego ∙ hrvatski ∙ Ido ∙ italiano ∙ lietuvių ∙ magyar ∙ Nederlands ∙ norsk bokmål ∙ norsk nynorsk ∙ occitan ∙ Plattdüütsch ∙ polski ∙ português ∙ português do Brasil ∙ română ∙ Scots ∙ sicilianu ∙ slovenčina ∙ slovenščina ∙ suomi ∙ svenska ∙ Tiếng Việt ∙ Türkçe ∙ vèneto ∙ Ελληνικά ∙ беларуская (тарашкевіца) ∙ български ∙ македонски ∙ нохчийн ∙ русский ∙ српски / srpski ∙ татарча/tatarça ∙ українська ∙ ქართული ∙ հայերեն ∙ বাংলা ∙ தமிழ் ∙ മലയാളം ∙ ไทย ∙ 한국어 ∙ 日本語 ∙ 简体中文 ∙ 繁體中文 ∙ עברית ∙ العربية ∙ فارسی ∙ +/−