File:Complex numbers addition.png

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Summary
Made by myself with matlab.

Source code
function main

% set up the plotting window thickness=2.5; fs=30; d=0.004; 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+0.2*i; z3=0.4+1.2*i; plot_seg(z1, z2, red, thickness); plot_seg(z2, z3, green, thickness); plot_seg(z3, z1, blue, thickness);

pt (z1, fs, 5, d, '0'); pt (z2, fs, 7, d, 'A'); pt (z3, fs, 3, d, 'B'); pt (z2+z3, fs, 1, d, 'X');

t=z2; z1=z2+z3; z2=z3; z3=t; plot_seg(z1, z2, red, thickness); plot_seg(z2, z3, green, thickness); plot_seg(z3, z1, blue, thickness);

saveas(gcf, 'Complex_numbers_addition.eps', 'psc2') % convert from eps to png with shell command % convert -antialias -density 400 -scale 20% Complex_numbers_addition.eps Complex_numbers_addition.png

function plot_seg(z1, z2, color, thickness); plot( [real(z1), real(z2)], [imag(z1), imag(z2)], 'color', color, 'linewidth', thickness );

function pt (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')

{| border="1" ! date/time || username || edit summary
 * 04:43, 24 October 2005 || |
 * 03:44, 24 October 2005 || |}
 * 03:44, 24 October 2005 || |}

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 * (del) (cur) 04:36, 24 October 2005 . . * (del) (rev) 04:34, 24 October 2005 . . * (del) (rev) 04:28, 24 October 2005 . . * (del) (rev) 04:26, 24 October 2005 . . * (del) (rev) 03:44, 24 October 2005 ..