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任意移动径向阴影

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任意移动径向阴影

我找不到解决方案

  1. 将圆移动到原点 (0,0)。如您在图二中看到的，图片“扭曲”了（扇形圆也一样！）？。放置位置应根据所选的纸张尺寸任意调整。
  2. 实现一个明确的纸张尺寸（想要选择 A4 或 A5）且不带边距。也许通过独立包？目前在这方面的输出是可以的，但纸张尺寸不行。注意：黑色背景的纸张宽度和高度的提及会更改为字母格式（这从何而来？）。
\documentclass[tikz,border=0mm]{standalone}
\usepackage{color}
\usetikzlibrary{math,}


\definecolor{clr1}{RGB}{0.00,0.00,0.00}
\definecolor{clr2}{RGB}{40,0.00,40}%
\definecolor{clr3}{RGB}{60,0,60}%
\definecolor{clr4}{RGB}{80,0,80}% 
\definecolor{clr5}{RGB}{100,255,100}%
\definecolor{clr6}{RGB}{139,0,139}%
\tikzset{
%%
%%
shade radial/.code={%
\tikzset{%
        color four radial/.cd,% 
        #1,
        cfradial
       }%end second(!) tikzset
},%end code shade radial!
%
color four radial/.cd,%causes default path to be set to key(color four radial)  
                  shade radial color/.code n args={2} 
{\colorlet{cfradialcolor#1}{#2}},
                                           shade radial color={1}{black},
                                           shade radial color={2}{black},
                                           shade radial color={3}{white},
                                           shade radial color={4}{white},
                                           shade radial color={5}{purple},
                                           shade radial color={6}{purple},
%
cfradial/.style={/tikz/path picture={
                                 \xdef\radius{\radius}
                                 \pgfmathsetmacro{\rone}{0.65*\radius}
                                 \pgfmathsetmacro{\rtwo}{0.90*\radius}
                                 \pgfmathsetmacro{\rthree}{0.98*\radius}
                                 \pgfmathsetmacro{\rfour}{0.99*\radius}
                                 \pgfdeclareradialshading[cfradialcolor1,cfradialcolor2,cfradialcolor3,cfradialcolor4,cfradialcolor5,cfradialcolor6]
                                                         {cfradial}%shading name s. 3.01a, p. 1083
                                                         {\centerpoint}%center point 
                                                         {color(0pt)=(cfradialcolor1); %color specifications
                                                          color(\rone pt)=(cfradialcolor2);
                                                          color(\rtwo pt)=(cfradialcolor3);
                                                          color(\rthree pt)=(cfradialcolor4);
                                                          color(\rfour pt)=(cfradialcolor5);
                                                          color(\radius)=(cfradialcolor6) %
                                                         }
                                  \typeout{\radius,\rone,\rtwo}
                                  \pgfuseshading{cfradial}
                                 }%end path picture
             }%end style cfradial
%%
%%
}%%en
\begin{document}

\begin{tikzpicture}%

\newdimen\circleradius

\tikzmath{
   \circleradius=14.0 cm;
}%end tikzmath

\coordinate (circleorig) at (-1cm,0cm);%%wrong if differs from (0,0)


\tikzset{
  recstyle/.style={minimum height=\paperheight,minimum width=\paperwidth,rectangle,draw=blue!50,fill=black!100,thick}
}
\node at (circleorig)  [recstyle]{background black};

\node [shape=circle, opacity=.5,
      inner sep=0cm,
      shade radial={
                    shade radial color={1}{clr1},
                    shade radial color={2}{clr2},
                    shade radial color={3}{clr3},
                    shade radial color={4}{clr4},
                    shade radial color={5}{clr5},
                    shade radial color={6}{clr6}
                   },%the one parameter of shade radial
      minimum size = \circleradius,
      font=\sffamily
     ] 
  (thecircle) at (circleorig) {do};
\end{tikzpicture} 
\end{document}

(0,0) 处无失真

在此处输入图片描述

我尝试过边界框等等，但我的能力太小，无法获得所需的输出。

答案1

我混合使用了 Latex 和 Tikz 来解决这个问题。整个正确的阴影图片被放在一个迷你页面中，除了边缘边框外，它占用了与图片一样多的空间，如果需要的话，可以用 Latex 的方式消除这些边框（新问题）。

小页面将根据 hspace 的值向左和向右移动，根据 vspace 的值向上和向下移动。

\documentclass[a4paper]{scrartcl}
\usepackage[margin=0cm,showframe]{geometry}

\usepackage{color}
\usepackage{tikz}
\usetikzlibrary{math,}


\definecolor{clr1}{RGB}{0.00,0.00,0.00}
\definecolor{clr2}{RGB}{40,0.00,40}%
\definecolor{clr3}{RGB}{60,0,60}%
\definecolor{clr4}{RGB}{80,0,80}%
\definecolor{clr5}{RGB}{100,255,100}%
\definecolor{clr6}{RGB}{139,0,139}%
\tikzset{
%%
%%
shade radial/.code={%
\tikzset{%
        color four radial/.cd,% 
        #1,
        cfradial
       }%end second(!) tikzset
},%end code shade radial!
%
color four radial/.cd,%causes default path to be set to key(color four radial)  
                  shade radial color/.code n args={2}{\colorlet{cfradialcolor#1}{#2}},
                                           shade radial color={1}{black},
                                           shade radial color={2}{black},
                                           shade radial color={3}{white},
                                           shade radial color={4}{white},
                                           shade radial color={5}{purple},
                                           shade radial color={6}{purple},
%
cfradial/.style={/tikz/path picture={
                                 \xdef\radius{\radius}
                                 \pgfmathsetmacro{\rone}{0.65*\radius}
                                 \pgfmathsetmacro{\rtwo}{0.90*\radius}
                                 \pgfmathsetmacro{\rthree}{0.98*\radius}
                                 \pgfmathsetmacro{\rfour}{0.99*\radius}
                                 \pgfdeclareradialshading[cfradialcolor1,cfradialcolor2,cfradialcolor3,cfradialcolor4,cfradialcolor5,cfradialcolor6]
                                                         {cfradial}%shading name s. 3.01a, p. 1083
                                                         {\centerpoint}%center point 
                                                         {color(0pt)=(cfradialcolor1); %color specifications
                                                          color(\rone pt)=(cfradialcolor2);
                                                          color(\rtwo pt)=(cfradialcolor3);
                                                          color(\rthree pt)=(cfradialcolor4);
                                                          color(\rfour pt)=(cfradialcolor5);
                                                          color(\radius)=(cfradialcolor6) %
                                                         }
                                  \typeout{\radius,\rone,\rtwo}
                                  \pgfuseshading{cfradial}
                                 }%end path picture
             }%end style cfradial
%%
%%
}%%end first tikzset

\begin{document}
%old code for black background replaced by this: 
%https://tex.stackexchange.com/questions/56716/shading-over-a-single-page?rq=1
%replace white and orange by black and the job is done
\begin{tikzpicture}[remember picture,overlay]
   \shade[left color=white,right color=orange!60]
      (current page.south west) rectangle (current page.north east);
\end{tikzpicture}

%height above the picture. adding to vspace sets the circle lower
\vspace*{40mm}
%if zero, circle on most left place. adding to hspace shifts the circle to right side
\hspace*{50mm}
%\fbox{%just to see the minipage
\begin{minipage}{145mm}
\begin{tikzpicture}%

\newdimen\circleradius

\tikzmath{\circleradius=14.0 cm;}%end tikzmath

\coordinate (circleorig) at (0cm,0cm);

 \node [shape=circle, 
      inner sep=0cm,
      shade radial={
                    shade radial color={1}{clr1},
                    shade radial color={2}{clr2},
                    shade radial color={3}{clr3},
                    shade radial color={4}{clr4},
                    shade radial color={5}{clr5},
                    shade radial color={6}{clr6}
                   },%the one parameter of shade radial
      minimum size = \circleradius,
      font=\sffamily
     ] 
  (thecircle) at (circleorig) {do};
\end{tikzpicture} 
\end{minipage}
%}%end fbox
\end{document}

在此处输入图片描述 在此处输入图片描述

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