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Summary
Made by myself with matlab.

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Licensing
Public domainPublic domainfalsefalse 

This work has been released into the public domain by its author, Oleg Alexandrov at the English Wikipedia project. This applies worldwide.
In case this is not legally possible: Oleg Alexandrov grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

Source code
function main ()
% set up the plotting window
thickness=2.8; fs=30; d=0.005;
red=[1, 0, 0]; green=[0, 1, 0]; blue=[0, 0, 1];
figure(1); clf; hold on; axis equal; axis off;
i=sqrt(1);
z1=0; z2=1; z3=1+i;
draw_segment(z1, z2, red, thickness);
draw_segment(z2, z3, green, thickness);
draw_segment(z3, z1, blue, thickness);
place_text_smartly (z1, fs, 5, d, '0');
place_text_smartly (z2, fs, 7, d, '1');
place_text_smartly (z3, fs, 1, d, 'A');
z1=0; z2=2*i; z3=2*i*(1+i);
draw_segment(z1, z2, red, thickness);
draw_segment(z2, z3, green, thickness);
draw_segment(z3, z1, blue, thickness);
place_text_smartly (z2, fs, 1, d, 'B');
place_text_smartly (z3, fs, 3, d, 'X');
saveas(gcf, 'Complex_numbers_multiplication.eps', 'psc2')
function draw_segment(z1, z2, color, thickness);
plot( [real(z1), real(z2)], [imag(z1), imag(z2)], 'color', colour, 'linewidth', thickness );
function place_text_smartly (z, fs, pos, d, tx)
p=cos(pi/4)+sqrt(1)*sin(pi/4);
z = z + p^pos * d * fs;
shiftx=0.0003;
shifty=0.002;
x = real (z); y=imag(z);
H=text(x+shiftx*fs, y+shifty*fs, tx); set(H, 'fontsize', fs, 'HorizontalAlignment', 'c', 'VerticalAlignment', 'c')
date/time 
username 
edit summary 
00:40, 22 November 2005 
en:User:Oleg Alexandrov 
(changes to source code) 
04:45, 24 October 2005 
en:User:Oleg Alexandrov 
(source code) 
03:44, 24 October 2005 
en:User:Oleg Alexandrov 
(Made by myself with matlab.) 
Historio de la dosiero
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 (del) (cur) 03:44, 24 October 2005 . . en:User:Oleg_Alexandrov Oleg Alexandrov ( en:User_talk:Oleg_Alexandrov Talk) . . 242x180 (3520 bytes) (Made by myself with matlab. )