| #### D.13.6.21 texDrawTropical Procedure from library `tropical.lib` (see tropical_lib). Usage: texDrawTropical(graph[,#]); graph list, # optional list Assume: graph is the output of tropicalCurve Return: string, the texdraw code of the tropical plane curve encoded by graph Note: - if the list # is non-empty, the first entry should be a string; if this string is 'max', then the tropical curve is considered with respect to the maximum - the procedure computes a scalefactor for the texdraw command which should help to display the curve in the right way; this may, however, be a bad idea if several texDrawTropical outputs are put together to form one image; the scalefactor can be prescribed by the further optional entry of type poly - one can add a string as last opional argument to the list #; it can be used to insert further texdraw commands (e.g. to have a lighter image as when called from inside conicWithTangents); - the list # is optional and may as well be empty Example:
    LIB "tropical.lib";
    ring r=(0,t),(x,y),dp;
    poly f=x+y+x2y+xy2+1/t*xy;
    list graph=tropicalCurve(f);
    // compute the texdraw code of the tropical curve defined by f
    texDrawTropical(graph);
    ==>
    ==>
    ==>        \setgray 0.6
    ==>
    ==>
    ==>        \relunitscale 6
    ==>        \move (-1 -1) \fcir f:0 r:0.03
    ==>        \move (-1 -1) \lvec (-1 1)
    ==>        \move (-1 -1) \lvec (1 -1)
    ==>        \move (-1 -1) \rlvec (-0.5 -0.5)
    ==>        \move (-1 1) \fcir f:0 r:0.03
    ==>        \move (-1 1) \lvec (1 1)
    ==>        \move (-1 1) \rlvec (-0.5 0.5)
    ==>        \move (1 -1) \fcir f:0 r:0.03
    ==>        \move (1 -1) \lvec (1 1)
    ==>        \move (1 -1) \rlvec (0.5 -0.5)
    ==>        \move (1 1) \fcir f:0 r:0.03
    ==>        \move (1 1) \rlvec (0.5 0.5)
    ==>
    ==>    %% HERE STARTS THE CODE FOR THE LATTICE
    ==>         \move (-1 -1) \fcir f:0.8 r:0.01
    ==>         \move (-1 0) \fcir f:0.8 r:0.01
    ==>         \move (-1 1) \fcir f:0.8 r:0.01
    ==>         \move (0 -1) \fcir f:0.8 r:0.01
    ==>         \move (0 0) \fcir f:0.8 r:0.01
    ==>         \move (0 1) \fcir f:0.8 r:0.01
    ==>         \move (1 -1) \fcir f:0.8 r:0.01
    ==>         \move (1 0) \fcir f:0.8 r:0.01
    ==>         \move (1 1) \fcir f:0.8 r:0.01
    ==>    %% HERE ENDS THE CODE FOR THE LATTICE
    ==>
    // compute the texdraw code again, but set the scalefactor to 1
    texDrawTropical(graph,"",1);
    ==>
    ==>
    ==>        \setgray 0.6
    ==>
    ==>
    ==>        \relunitscale 6
    ==>        \move (-1 -1) \fcir f:0 r:0.03
    ==>        \move (-1 -1) \lvec (-1 1)
    ==>        \move (-1 -1) \lvec (1 -1)
    ==>        \move (-1 -1) \rlvec (-0.5 -0.5)
    ==>        \move (-1 1) \fcir f:0 r:0.03
    ==>        \move (-1 1) \lvec (1 1)
    ==>        \move (-1 1) \rlvec (-0.5 0.5)
    ==>        \move (1 -1) \fcir f:0 r:0.03
    ==>        \move (1 -1) \lvec (1 1)
    ==>        \move (1 -1) \rlvec (0.5 -0.5)
    ==>        \move (1 1) \fcir f:0 r:0.03
    ==>        \move (1 1) \rlvec (0.5 0.5)
    ==>
    ==>    %% HERE STARTS THE CODE FOR THE LATTICE
    ==>         \move (-1 -1) \fcir f:0.8 r:0.01
    ==>         \move (-1 0) \fcir f:0.8 r:0.01
    ==>         \move (-1 1) \fcir f:0.8 r:0.01
    ==>         \move (0 -1) \fcir f:0.8 r:0.01
    ==>         \move (0 0) \fcir f:0.8 r:0.01
    ==>         \move (0 1) \fcir f:0.8 r:0.01
    ==>         \move (1 -1) \fcir f:0.8 r:0.01
    ==>         \move (1 0) \fcir f:0.8 r:0.01
    ==>         \move (1 1) \fcir f:0.8 r:0.01
    ==>    %% HERE ENDS THE CODE FOR THE LATTICE
    ==>

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