色光三原色

 

 

 

 Mathematica code:

coords =1/2{{1,-(Sqrt[3]/3)},{0,(2Sqrt[3])/3},{-1,-(Sqrt[3]/3)}};

colors ={Red,Green,Blue};
Fold[ImageAdd,First@#,Rest@#]&@
  MapThread[Graphics[{##},PlotRange->1.8,Background->Black]&,
    {colors,Disk/@ coords}]
Clear[coord, colors]

 

Manipulate[

 With[{c1 ={x1, y1}, c2 ={x2, y2}, c3 ={x3, y3}},

  Module[{pts1, pts2, pts3},

    {pts1, pts2, pts3}=

    Quiet@Solve[{Tr[({x, y}-#1)^2]==#2^2,

         Tr[({x, y}-#3)^2]==#4^2},{x, y},Reals]&@@@{{c1, r1,

       c2, r2},{c1, r1, c3, r3},{c2, r2, c3, r3}};

   Fold[ImageAdd,First@#,Rest@#]&@

    MapThread[

     Graphics[{##,{PointSize[Large],

         Point[If[#=={},{},{x, y}/.#//Re]]&/@{pts1, pts2,

           pts3}}}, Axes->1,AxesStyle->White,PlotRange->6,

       Background->GrayLevel[0.02]]&,{{Red,Green,Blue},

      Disk@@@{{c1, r1},{c2, r2},{c3, r3}}}]]],

    {{x1,1},-4,   4},{{y1,-1/Sqrt[3]},-4,4},{{r1,2},0,4},

    {{x2,0},-4,4},{{y2,2/Sqrt[3]},-4,4},{{r2,2},0,4},

    {{x3,-1},-4,  4},{{y3,-1/Sqrt[3]},-4,4},{{r3,2},0,4}]