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asymptote: Figure size

 
 3.3 Figure size
 ===============
 
 In 'Asymptote', coordinates like '(0,0)' and '(100,100)', called
 _pairs_, are expressed in 'PostScript' "big points" (1 'bp' = 1/72
 'inch') and the default line width is '0.5bp'.  However, it is often
 inconvenient to work directly in 'PostScript' coordinates.  The next
 example produces identical output to the previous example, by scaling
 the line '(0,0)--(1,1)' to fit a rectangle of width '100.5 bp' and
 height '100.5 bp' (the extra '0.5bp' accounts for the line width):
 size(100.5,100.5);
 draw((0,0)--(1,1));
 
                               [diagonal]
 
    One can also specify the size in 'pt' (1 'pt' = 1/72.27 'inch'),
 'cm', 'mm', or 'inches'.  Two nonzero size arguments (or a single size
 argument) restrict the size in both directions, preserving the aspect
 ratio.  If 0 is given as a size argument, no restriction is made in that
 direction; the overall scaling will be determined by the other direction
 (size):
 size(0,100.5);
 draw((0,0)--(2,1),Arrow);
 
                              [bigdiagonal]
 
    To connect several points and create a cyclic path, use the 'cycle'
 keyword:
 size(3cm);
 draw((0,0)--(1,0)--(1,1)--(0,1)--cycle);
 
                                [square]
 For convenience, the path '(0,0)--(1,0)--(1,1)--(0,1)--cycle' may be
 replaced with the predefined variable 'unitsquare', or equivalently,
 'box((0,0),(1,1))'.
 
    To make the user coordinates represent multiples of exactly '1cm':
 unitsize(1cm);
 draw(unitsquare);
 

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