The picture is generated by the program working together with text file «1000000 sign of pi.txt» with decimal digits of 
. File could be downloaded freely from tripnet.se. Clicking on «+» button, one could add next 13 digits of of the picture as coloured segment, which is calculated as follows: first 12 digits define the coordinates of start and ending points of the segment, and the 13th digit sets colour of the segment. The width of each segment is 20 pixels.