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3.1.5.4 TikZ/PGF user-defined styles

TikZ/PGF allows named styles defined by the user, for example 

  \tikzstyle{mypolygonstyle} = [fill=blue!20,fill opacity=0.8]  
  \tikzstyle{mylinestyle} = [red!20,dashed]
Since sketch has no information on the contents of such styles, it omits them entirely from lines, polygons, and their edges during option splitting. For example, 
  polygon[style=mypolygonstyle,style=thick](0,0,1)(1,0,0)(0,1,0)
  line[style=mylinestyle](-1,-1,-1)(2,2,2)
produces the TikZ output 
  \draw(-1,-1)--(.333,.333);
  \filldraw[thick,fill=white](0,0)--(1,0)--(0,1)--cycle;
  \draw(.333,.333)--(2,2);
Note that the user-defined styles are not present. Sketch also issues warnings: 
  warning, unknown polygon option style=mypolygonstyle will be ignored
  warning, unknown line option style=mylinestyle will be ignored

The remedy is to state explicitly whether a user-defined style should be attched to polygons or lines in the TikZ output using pseudo-options fill style and line style, 

  polygon[fill style=mypolygonstyle,style=thick](0,0,1)(1,0,0)(0,1,0)
  line[line style=mylinestyle](-1,-1,-1)(2,2,2)
Now, the output is 
  \draw[mylinestyle](-1,-1)--(.333,.333);
  \filldraw[mypolygonstyle,thick](0,0)--(1,0)--(0,1)--cycle;
  \draw[mylinestyle](.333,.333)--(2,2);

A useful technique is to include user-defined style definitions in sketch code as specials with option [lay=under] to ensure that the styles are emitted first in the output, before any uses of the style names. 1 For example, 

  special|\tikzstyle{mypolygonstyle} = [fill=blue!20,fill opacity=0.8]|[lay=under]
  special|\tikzstyle{mylinestyle} = [red!20,dashed]|[lay=under]
The author is responsible for using the key, line style or fill style, that matches the content of the style definition.

Footnotes

[1] This clever trick is due to Kjell Magne Fauske.

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