Problem with shadings declarations in pgf












0















I have no real question but rather some observations about declaring shadings in pgf.



First strange thing is that parameterless shadings are declared globally while shadings with parameters are declared locally. For instance, if one says



begingroup

  pgfdeclareverticalshading{myshading1}{1cm}{color(0cm)=(red);color(1cm)=(blue)}

  pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}

endgroup


then



pgfuseshading{myshading1}


works because myshading1 was actually declared globally, while



colorlet{mycolor}{red}

pgfuseshading{myshading1}


does not because myshading2 was declared locally.



However, when a shading with parameters is used, a specific instance is declared globally if not already declared. For instance, after



begingroup

  pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}

  colorlet{mycolor}{red}

  pgfuseshading{myshading2}

endgroup


the shading myshading2,1,0,0 is declared globally (red=rgb(1,0,0)), and one may use



pgfuseshading{myshading2,1,0,0}


although myshading2 is not defined anymore.



Another problem is that redefining a shading with parameters is impossible or at least may produce strange results. In the following example, myshading2 is first declared as a vertical shading and used with mycolor=red. Afterwards it is redeclared as a radial shading and used first with mycolor=green which works as expected and then with mycolor=red which uses falsely the vertical shading: since myshading2,1,0,0 was already declared, it is not redefined.



pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}

colorlet{mycolor}{red}

pgfuseshading{myshading2}

pgfdeclareradialshading[mycolor]{myshading2}{pgfpointorigin}{color(0cm)=(mycolor!20);color(.5cm)=(mycolor)}

colorlet{mycolor}{green}

pgfuseshading{myshading2}% correct

colorlet{mycolor}{red}

pgfuseshading{myshading2}% incorrect: uses the vertical shading 'myshading2[red]'





tikz-pgf shading







share|improve this question



























    0















    I have no real question but rather some observations about declaring shadings in pgf.



    First strange thing is that parameterless shadings are declared globally while shadings with parameters are declared locally. For instance, if one says



    begingroup
    
  pgfdeclareverticalshading{myshading1}{1cm}{color(0cm)=(red);color(1cm)=(blue)}
    
  pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}
    
endgroup


    then



    pgfuseshading{myshading1}


    works because myshading1 was actually declared globally, while



    colorlet{mycolor}{red}
    
pgfuseshading{myshading1}


    does not because myshading2 was declared locally.



    However, when a shading with parameters is used, a specific instance is declared globally if not already declared. For instance, after



    begingroup
    
  pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}
    
  colorlet{mycolor}{red}
    
  pgfuseshading{myshading2}
    
endgroup


    the shading myshading2,1,0,0 is declared globally (red=rgb(1,0,0)), and one may use



    pgfuseshading{myshading2,1,0,0}


    although myshading2 is not defined anymore.



    Another problem is that redefining a shading with parameters is impossible or at least may produce strange results. In the following example, myshading2 is first declared as a vertical shading and used with mycolor=red. Afterwards it is redeclared as a radial shading and used first with mycolor=green which works as expected and then with mycolor=red which uses falsely the vertical shading: since myshading2,1,0,0 was already declared, it is not redefined.



    pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}
    
colorlet{mycolor}{red}
    
pgfuseshading{myshading2}
    
pgfdeclareradialshading[mycolor]{myshading2}{pgfpointorigin}{color(0cm)=(mycolor!20);color(.5cm)=(mycolor)}
    
colorlet{mycolor}{green}
    
pgfuseshading{myshading2}% correct
    
colorlet{mycolor}{red}
    
pgfuseshading{myshading2}% incorrect: uses the vertical shading 'myshading2[red]'





    tikz-pgf shading







    share|improve this question

























      0












      0








      0








      I have no real question but rather some observations about declaring shadings in pgf.



      First strange thing is that parameterless shadings are declared globally while shadings with parameters are declared locally. For instance, if one says



      begingroup
      
  pgfdeclareverticalshading{myshading1}{1cm}{color(0cm)=(red);color(1cm)=(blue)}
      
  pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}
      
endgroup


      then



      pgfuseshading{myshading1}


      works because myshading1 was actually declared globally, while



      colorlet{mycolor}{red}
      
pgfuseshading{myshading1}


      does not because myshading2 was declared locally.



      However, when a shading with parameters is used, a specific instance is declared globally if not already declared. For instance, after



      begingroup
      
  pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}
      
  colorlet{mycolor}{red}
      
  pgfuseshading{myshading2}
      
endgroup


      the shading myshading2,1,0,0 is declared globally (red=rgb(1,0,0)), and one may use



      pgfuseshading{myshading2,1,0,0}


      although myshading2 is not defined anymore.



      Another problem is that redefining a shading with parameters is impossible or at least may produce strange results. In the following example, myshading2 is first declared as a vertical shading and used with mycolor=red. Afterwards it is redeclared as a radial shading and used first with mycolor=green which works as expected and then with mycolor=red which uses falsely the vertical shading: since myshading2,1,0,0 was already declared, it is not redefined.



      pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}
      
colorlet{mycolor}{red}
      
pgfuseshading{myshading2}
      
pgfdeclareradialshading[mycolor]{myshading2}{pgfpointorigin}{color(0cm)=(mycolor!20);color(.5cm)=(mycolor)}
      
colorlet{mycolor}{green}
      
pgfuseshading{myshading2}% correct
      
colorlet{mycolor}{red}
      
pgfuseshading{myshading2}% incorrect: uses the vertical shading 'myshading2[red]'





      tikz-pgf shading







      share|improve this question














      I have no real question but rather some observations about declaring shadings in pgf.



      First strange thing is that parameterless shadings are declared globally while shadings with parameters are declared locally. For instance, if one says



      begingroup
      
  pgfdeclareverticalshading{myshading1}{1cm}{color(0cm)=(red);color(1cm)=(blue)}
      
  pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}
      
endgroup


      then



      pgfuseshading{myshading1}


      works because myshading1 was actually declared globally, while



      colorlet{mycolor}{red}
      
pgfuseshading{myshading1}


      does not because myshading2 was declared locally.



      However, when a shading with parameters is used, a specific instance is declared globally if not already declared. For instance, after



      begingroup
      
  pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}
      
  colorlet{mycolor}{red}
      
  pgfuseshading{myshading2}
      
endgroup


      the shading myshading2,1,0,0 is declared globally (red=rgb(1,0,0)), and one may use



      pgfuseshading{myshading2,1,0,0}


      although myshading2 is not defined anymore.



      Another problem is that redefining a shading with parameters is impossible or at least may produce strange results. In the following example, myshading2 is first declared as a vertical shading and used with mycolor=red. Afterwards it is redeclared as a radial shading and used first with mycolor=green which works as expected and then with mycolor=red which uses falsely the vertical shading: since myshading2,1,0,0 was already declared, it is not redefined.



      pgfdeclareverticalshading[mycolor]{myshading2}{1cm}{color(0cm)=(mycolor);color(1cm)=(mycolor!20)}
      
colorlet{mycolor}{red}
      
pgfuseshading{myshading2}
      
pgfdeclareradialshading[mycolor]{myshading2}{pgfpointorigin}{color(0cm)=(mycolor!20);color(.5cm)=(mycolor)}
      
colorlet{mycolor}{green}
      
pgfuseshading{myshading2}% correct
      
colorlet{mycolor}{red}
      
pgfuseshading{myshading2}% incorrect: uses the vertical shading 'myshading2[red]'





      tikz-pgf shading




      tikz-pgf shading






      share|improve this question













      share|improve this question











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      asked Jan 29 at 17:21









      Eric DomenjoudEric Domenjoud

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