Drawing a Tank with Water in it











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I am trying to draw a cylindrical tank that has water in it, using tikz. Here is what I have so far:



documentclass[a4paper, 12pt]{article}
usepackage{pgfplots}
pgfplotsset{compat=1.15}
usepgfplotslibrary{polar}
usepgflibrary{shapes.geometric}
usetikzlibrary{calc}

begin{document}

begin{figure}[ht]

centering

begin{tikzpicture}

node[draw, cylinder, rotate=90, shape aspect=4, minimum height=4cm, minimum
width=8cm, fill = blue, fill opacity = 0.2, blue] {};

node[draw, cylinder, rotate=90, shape aspect=4, minimum height=6cm, minimum
width=8cm, thick] (A) {};

draw[dashed, thick]
let p1 = ($ (A.after bottom) - (A.before bottom) $),
n1 = {0.5*veclen(x1,y1)-pgflinewidth},
p2 = ($ (A.bottom) - (A.after bottom)!.5!(A.before bottom) $),
n2 = {veclen(x2,y2)-pgflinewidth}
in
([xshift=-pgflinewidth] A.before bottom) arc [start angle=0, end
angle=180,
x radius=n1, y radius=n2];

end{tikzpicture}

caption{The tank.}
label{fig:tank}

end{figure}

end{document}


This is the result:



enter image description here



I want the blue part to be shifted down so that it is at the same level as the bottom of the black one.



Any suggestions to this solution, or to making my code more efficient, would be great!










share|improve this question


























    up vote
    4
    down vote

    favorite












    I am trying to draw a cylindrical tank that has water in it, using tikz. Here is what I have so far:



    documentclass[a4paper, 12pt]{article}
    usepackage{pgfplots}
    pgfplotsset{compat=1.15}
    usepgfplotslibrary{polar}
    usepgflibrary{shapes.geometric}
    usetikzlibrary{calc}

    begin{document}

    begin{figure}[ht]

    centering

    begin{tikzpicture}

    node[draw, cylinder, rotate=90, shape aspect=4, minimum height=4cm, minimum
    width=8cm, fill = blue, fill opacity = 0.2, blue] {};

    node[draw, cylinder, rotate=90, shape aspect=4, minimum height=6cm, minimum
    width=8cm, thick] (A) {};

    draw[dashed, thick]
    let p1 = ($ (A.after bottom) - (A.before bottom) $),
    n1 = {0.5*veclen(x1,y1)-pgflinewidth},
    p2 = ($ (A.bottom) - (A.after bottom)!.5!(A.before bottom) $),
    n2 = {veclen(x2,y2)-pgflinewidth}
    in
    ([xshift=-pgflinewidth] A.before bottom) arc [start angle=0, end
    angle=180,
    x radius=n1, y radius=n2];

    end{tikzpicture}

    caption{The tank.}
    label{fig:tank}

    end{figure}

    end{document}


    This is the result:



    enter image description here



    I want the blue part to be shifted down so that it is at the same level as the bottom of the black one.



    Any suggestions to this solution, or to making my code more efficient, would be great!










    share|improve this question
























      up vote
      4
      down vote

      favorite









      up vote
      4
      down vote

      favorite











      I am trying to draw a cylindrical tank that has water in it, using tikz. Here is what I have so far:



      documentclass[a4paper, 12pt]{article}
      usepackage{pgfplots}
      pgfplotsset{compat=1.15}
      usepgfplotslibrary{polar}
      usepgflibrary{shapes.geometric}
      usetikzlibrary{calc}

      begin{document}

      begin{figure}[ht]

      centering

      begin{tikzpicture}

      node[draw, cylinder, rotate=90, shape aspect=4, minimum height=4cm, minimum
      width=8cm, fill = blue, fill opacity = 0.2, blue] {};

      node[draw, cylinder, rotate=90, shape aspect=4, minimum height=6cm, minimum
      width=8cm, thick] (A) {};

      draw[dashed, thick]
      let p1 = ($ (A.after bottom) - (A.before bottom) $),
      n1 = {0.5*veclen(x1,y1)-pgflinewidth},
      p2 = ($ (A.bottom) - (A.after bottom)!.5!(A.before bottom) $),
      n2 = {veclen(x2,y2)-pgflinewidth}
      in
      ([xshift=-pgflinewidth] A.before bottom) arc [start angle=0, end
      angle=180,
      x radius=n1, y radius=n2];

      end{tikzpicture}

      caption{The tank.}
      label{fig:tank}

      end{figure}

      end{document}


      This is the result:



      enter image description here



      I want the blue part to be shifted down so that it is at the same level as the bottom of the black one.



      Any suggestions to this solution, or to making my code more efficient, would be great!










      share|improve this question













      I am trying to draw a cylindrical tank that has water in it, using tikz. Here is what I have so far:



      documentclass[a4paper, 12pt]{article}
      usepackage{pgfplots}
      pgfplotsset{compat=1.15}
      usepgfplotslibrary{polar}
      usepgflibrary{shapes.geometric}
      usetikzlibrary{calc}

      begin{document}

      begin{figure}[ht]

      centering

      begin{tikzpicture}

      node[draw, cylinder, rotate=90, shape aspect=4, minimum height=4cm, minimum
      width=8cm, fill = blue, fill opacity = 0.2, blue] {};

      node[draw, cylinder, rotate=90, shape aspect=4, minimum height=6cm, minimum
      width=8cm, thick] (A) {};

      draw[dashed, thick]
      let p1 = ($ (A.after bottom) - (A.before bottom) $),
      n1 = {0.5*veclen(x1,y1)-pgflinewidth},
      p2 = ($ (A.bottom) - (A.after bottom)!.5!(A.before bottom) $),
      n2 = {veclen(x2,y2)-pgflinewidth}
      in
      ([xshift=-pgflinewidth] A.before bottom) arc [start angle=0, end
      angle=180,
      x radius=n1, y radius=n2];

      end{tikzpicture}

      caption{The tank.}
      label{fig:tank}

      end{figure}

      end{document}


      This is the result:



      enter image description here



      I want the blue part to be shifted down so that it is at the same level as the bottom of the black one.



      Any suggestions to this solution, or to making my code more efficient, would be great!







      tikz-pgf draw shapes






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      asked 2 hours ago









      Aiden Kenny

      1315




      1315






















          3 Answers
          3






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          up vote
          2
          down vote













          I have figured out a solution. In the square brackets containing the parameters for the first cylinder (the one drawing the water), we need only add xshift = -0.75cm. Since the height of the outer cylinder is 6cm and the height of the inner is 4.5cm, so the difference in height is 1.5cm. Since both cylinders are centered at the same spot, the height of the gaps above and below the blue are 0.75cm each, so we just have to shift it down that distance. I was at first curious as to yshift did not work, but then I realized that the cylinder is rotated in the beginning by 90 degrees, so that is probably the reason.






          share|improve this answer




























            up vote
            2
            down vote













            you need to define anchors of your cylinders at their bottoms ...



            documentclass[a4paper, 12pt]{article}
            %usepackage{pgfplots}
            %pgfplotsset{compat=1.15}
            %usepgfplotslibrary{polar}
            usepackage{tikz}
            usetikzlibrary{calc,
            positioning,
            shapes.geometric}

            begin{document}
            begin{figure}[ht]
            centering
            begin{tikzpicture}[
            node distance = 0pt,
            valj/.style args = {#1/#2}{draw, cylinder, shape aspect=4, shape border rotate=90,
            fill=#2, fill opacity=0.2,
            minimum height=#1, minimum width=8cm,
            outer sep=0pt, anchor=bottom, % <--- added
            node contents={}
            }
            ]
            node (A) [valj=60mm/white];
            node (B) [valj=40mm/blue,
            above=of A.bottom]; % <--- positioning of cylinder
            draw[dashed]
            let p1 = ($ (A.after bottom) - (A.before bottom) $),
            n1 = {0.5*veclen(x1,y1)-pgflinewidth},
            p2 = ($ (A.bottom) - (A.after bottom)!.5!(A.before bottom) $),
            n2 = {veclen(x2,y2)}
            in (A.before bottom) arc [start angle=0, end angle=180,
            x radius=n1, y radius=n2];
            end{tikzpicture}
            caption{The tank.}
            label{fig:tank}
            end{figure}
            end{document}


            enter image description here






            share|improve this answer




























              up vote
              2
              down vote













              I would use tikz-3dplot for it, in particular if you are considering adding more 3d-like elements. The following has 4 parameters, one view angle which is set to 100, a radius R, the height of the water HW and the height of the cylinder HC.



              documentclass[tikz,border=3.14mm]{standalone}
              usepackage{tikz-3dplot}
              usepgflibrary{shapes.geometric}
              usetikzlibrary{calc}
              begin{document}
              tdplotsetmaincoords{100}{0}
              begin{tikzpicture}[tdplot_main_coords]
              pgfmathsetmacro{R}{4}
              pgfmathsetmacro{HW}{4}
              pgfmathsetmacro{HC}{6}
              % water
              fill[blue!40] plot[variable=x,domain=0:180,smooth] ({R*cos(x)},{R*sin(x)},0)
              --
              plot[variable=x,domain=180:360,smooth] ({R*cos(x)},{R*sin(x)},HW)
              -- cycle;
              draw[blue] plot[variable=x,domain=0:360,smooth,samples=51]
              ({R*cos(x)},{R*sin(x)},HW);
              % "invisible" lined
              draw[dashed] plot[variable=x,domain=180:360,smooth]
              ({R*cos(x)},{R*sin(x)},0);
              % visible cylinder lines
              draw plot[variable=x,domain=0:180,smooth]
              ({R*cos(x)},{R*sin(x)},0)
              --
              plot[variable=x,domain=180:360,smooth]
              ({R*cos(x)},{R*sin(x)},HC) -- cycle;
              draw plot[variable=x,domain=0:180,smooth]
              ({R*cos(x)},{R*sin(x)},HC);
              end{tikzpicture}
              end{document}


              enter image description here



              The meaning of the view angle is illustrated by this animation.



              documentclass[tikz,border=3.14mm]{standalone}
              usepackage{tikz-3dplot}
              usepgflibrary{shapes.geometric}
              usetikzlibrary{calc}
              begin{document}
              foreach X in {0,10,...,350}
              {tdplotsetmaincoords{120+30*sin(X)}{0}
              begin{tikzpicture}
              pgfmathsetmacro{R}{4}
              pgfmathsetmacro{HW}{4}
              pgfmathsetmacro{HC}{6}
              path[use as bounding box] (-1.1*R,-0.75*HC) rectangle (1.1*R,1.25*HC);
              begin{scope}[tdplot_main_coords]
              % water
              fill[blue!40] plot[variable=x,domain=0:180,smooth] ({R*cos(x)},{R*sin(x)},0)
              --
              plot[variable=x,domain=180:360,smooth] ({R*cos(x)},{R*sin(x)},HW)
              -- cycle;
              draw[blue] plot[variable=x,domain=0:360,smooth,samples=51]
              ({R*cos(x)},{R*sin(x)},HW);
              % "invisible" lined
              draw[dashed] plot[variable=x,domain=180:360,smooth]
              ({R*cos(x)},{R*sin(x)},0);
              % visible cylinder lines
              draw plot[variable=x,domain=0:180,smooth]
              ({R*cos(x)},{R*sin(x)},0)
              --
              plot[variable=x,domain=180:360,smooth]
              ({R*cos(x)},{R*sin(x)},HC) -- cycle;
              draw plot[variable=x,domain=0:180,smooth]
              ({R*cos(x)},{R*sin(x)},HC);
              end{scope}
              end{tikzpicture}}
              end{document}


              enter image description here






              share|improve this answer























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                3 Answers
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                oldest

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                3 Answers
                3






                active

                oldest

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                active

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                up vote
                2
                down vote













                I have figured out a solution. In the square brackets containing the parameters for the first cylinder (the one drawing the water), we need only add xshift = -0.75cm. Since the height of the outer cylinder is 6cm and the height of the inner is 4.5cm, so the difference in height is 1.5cm. Since both cylinders are centered at the same spot, the height of the gaps above and below the blue are 0.75cm each, so we just have to shift it down that distance. I was at first curious as to yshift did not work, but then I realized that the cylinder is rotated in the beginning by 90 degrees, so that is probably the reason.






                share|improve this answer

























                  up vote
                  2
                  down vote













                  I have figured out a solution. In the square brackets containing the parameters for the first cylinder (the one drawing the water), we need only add xshift = -0.75cm. Since the height of the outer cylinder is 6cm and the height of the inner is 4.5cm, so the difference in height is 1.5cm. Since both cylinders are centered at the same spot, the height of the gaps above and below the blue are 0.75cm each, so we just have to shift it down that distance. I was at first curious as to yshift did not work, but then I realized that the cylinder is rotated in the beginning by 90 degrees, so that is probably the reason.






                  share|improve this answer























                    up vote
                    2
                    down vote










                    up vote
                    2
                    down vote









                    I have figured out a solution. In the square brackets containing the parameters for the first cylinder (the one drawing the water), we need only add xshift = -0.75cm. Since the height of the outer cylinder is 6cm and the height of the inner is 4.5cm, so the difference in height is 1.5cm. Since both cylinders are centered at the same spot, the height of the gaps above and below the blue are 0.75cm each, so we just have to shift it down that distance. I was at first curious as to yshift did not work, but then I realized that the cylinder is rotated in the beginning by 90 degrees, so that is probably the reason.






                    share|improve this answer












                    I have figured out a solution. In the square brackets containing the parameters for the first cylinder (the one drawing the water), we need only add xshift = -0.75cm. Since the height of the outer cylinder is 6cm and the height of the inner is 4.5cm, so the difference in height is 1.5cm. Since both cylinders are centered at the same spot, the height of the gaps above and below the blue are 0.75cm each, so we just have to shift it down that distance. I was at first curious as to yshift did not work, but then I realized that the cylinder is rotated in the beginning by 90 degrees, so that is probably the reason.







                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered 1 hour ago









                    Aiden Kenny

                    1315




                    1315






















                        up vote
                        2
                        down vote













                        you need to define anchors of your cylinders at their bottoms ...



                        documentclass[a4paper, 12pt]{article}
                        %usepackage{pgfplots}
                        %pgfplotsset{compat=1.15}
                        %usepgfplotslibrary{polar}
                        usepackage{tikz}
                        usetikzlibrary{calc,
                        positioning,
                        shapes.geometric}

                        begin{document}
                        begin{figure}[ht]
                        centering
                        begin{tikzpicture}[
                        node distance = 0pt,
                        valj/.style args = {#1/#2}{draw, cylinder, shape aspect=4, shape border rotate=90,
                        fill=#2, fill opacity=0.2,
                        minimum height=#1, minimum width=8cm,
                        outer sep=0pt, anchor=bottom, % <--- added
                        node contents={}
                        }
                        ]
                        node (A) [valj=60mm/white];
                        node (B) [valj=40mm/blue,
                        above=of A.bottom]; % <--- positioning of cylinder
                        draw[dashed]
                        let p1 = ($ (A.after bottom) - (A.before bottom) $),
                        n1 = {0.5*veclen(x1,y1)-pgflinewidth},
                        p2 = ($ (A.bottom) - (A.after bottom)!.5!(A.before bottom) $),
                        n2 = {veclen(x2,y2)}
                        in (A.before bottom) arc [start angle=0, end angle=180,
                        x radius=n1, y radius=n2];
                        end{tikzpicture}
                        caption{The tank.}
                        label{fig:tank}
                        end{figure}
                        end{document}


                        enter image description here






                        share|improve this answer

























                          up vote
                          2
                          down vote













                          you need to define anchors of your cylinders at their bottoms ...



                          documentclass[a4paper, 12pt]{article}
                          %usepackage{pgfplots}
                          %pgfplotsset{compat=1.15}
                          %usepgfplotslibrary{polar}
                          usepackage{tikz}
                          usetikzlibrary{calc,
                          positioning,
                          shapes.geometric}

                          begin{document}
                          begin{figure}[ht]
                          centering
                          begin{tikzpicture}[
                          node distance = 0pt,
                          valj/.style args = {#1/#2}{draw, cylinder, shape aspect=4, shape border rotate=90,
                          fill=#2, fill opacity=0.2,
                          minimum height=#1, minimum width=8cm,
                          outer sep=0pt, anchor=bottom, % <--- added
                          node contents={}
                          }
                          ]
                          node (A) [valj=60mm/white];
                          node (B) [valj=40mm/blue,
                          above=of A.bottom]; % <--- positioning of cylinder
                          draw[dashed]
                          let p1 = ($ (A.after bottom) - (A.before bottom) $),
                          n1 = {0.5*veclen(x1,y1)-pgflinewidth},
                          p2 = ($ (A.bottom) - (A.after bottom)!.5!(A.before bottom) $),
                          n2 = {veclen(x2,y2)}
                          in (A.before bottom) arc [start angle=0, end angle=180,
                          x radius=n1, y radius=n2];
                          end{tikzpicture}
                          caption{The tank.}
                          label{fig:tank}
                          end{figure}
                          end{document}


                          enter image description here






                          share|improve this answer























                            up vote
                            2
                            down vote










                            up vote
                            2
                            down vote









                            you need to define anchors of your cylinders at their bottoms ...



                            documentclass[a4paper, 12pt]{article}
                            %usepackage{pgfplots}
                            %pgfplotsset{compat=1.15}
                            %usepgfplotslibrary{polar}
                            usepackage{tikz}
                            usetikzlibrary{calc,
                            positioning,
                            shapes.geometric}

                            begin{document}
                            begin{figure}[ht]
                            centering
                            begin{tikzpicture}[
                            node distance = 0pt,
                            valj/.style args = {#1/#2}{draw, cylinder, shape aspect=4, shape border rotate=90,
                            fill=#2, fill opacity=0.2,
                            minimum height=#1, minimum width=8cm,
                            outer sep=0pt, anchor=bottom, % <--- added
                            node contents={}
                            }
                            ]
                            node (A) [valj=60mm/white];
                            node (B) [valj=40mm/blue,
                            above=of A.bottom]; % <--- positioning of cylinder
                            draw[dashed]
                            let p1 = ($ (A.after bottom) - (A.before bottom) $),
                            n1 = {0.5*veclen(x1,y1)-pgflinewidth},
                            p2 = ($ (A.bottom) - (A.after bottom)!.5!(A.before bottom) $),
                            n2 = {veclen(x2,y2)}
                            in (A.before bottom) arc [start angle=0, end angle=180,
                            x radius=n1, y radius=n2];
                            end{tikzpicture}
                            caption{The tank.}
                            label{fig:tank}
                            end{figure}
                            end{document}


                            enter image description here






                            share|improve this answer












                            you need to define anchors of your cylinders at their bottoms ...



                            documentclass[a4paper, 12pt]{article}
                            %usepackage{pgfplots}
                            %pgfplotsset{compat=1.15}
                            %usepgfplotslibrary{polar}
                            usepackage{tikz}
                            usetikzlibrary{calc,
                            positioning,
                            shapes.geometric}

                            begin{document}
                            begin{figure}[ht]
                            centering
                            begin{tikzpicture}[
                            node distance = 0pt,
                            valj/.style args = {#1/#2}{draw, cylinder, shape aspect=4, shape border rotate=90,
                            fill=#2, fill opacity=0.2,
                            minimum height=#1, minimum width=8cm,
                            outer sep=0pt, anchor=bottom, % <--- added
                            node contents={}
                            }
                            ]
                            node (A) [valj=60mm/white];
                            node (B) [valj=40mm/blue,
                            above=of A.bottom]; % <--- positioning of cylinder
                            draw[dashed]
                            let p1 = ($ (A.after bottom) - (A.before bottom) $),
                            n1 = {0.5*veclen(x1,y1)-pgflinewidth},
                            p2 = ($ (A.bottom) - (A.after bottom)!.5!(A.before bottom) $),
                            n2 = {veclen(x2,y2)}
                            in (A.before bottom) arc [start angle=0, end angle=180,
                            x radius=n1, y radius=n2];
                            end{tikzpicture}
                            caption{The tank.}
                            label{fig:tank}
                            end{figure}
                            end{document}


                            enter image description here







                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered 1 hour ago









                            Zarko

                            117k865155




                            117k865155






















                                up vote
                                2
                                down vote













                                I would use tikz-3dplot for it, in particular if you are considering adding more 3d-like elements. The following has 4 parameters, one view angle which is set to 100, a radius R, the height of the water HW and the height of the cylinder HC.



                                documentclass[tikz,border=3.14mm]{standalone}
                                usepackage{tikz-3dplot}
                                usepgflibrary{shapes.geometric}
                                usetikzlibrary{calc}
                                begin{document}
                                tdplotsetmaincoords{100}{0}
                                begin{tikzpicture}[tdplot_main_coords]
                                pgfmathsetmacro{R}{4}
                                pgfmathsetmacro{HW}{4}
                                pgfmathsetmacro{HC}{6}
                                % water
                                fill[blue!40] plot[variable=x,domain=0:180,smooth] ({R*cos(x)},{R*sin(x)},0)
                                --
                                plot[variable=x,domain=180:360,smooth] ({R*cos(x)},{R*sin(x)},HW)
                                -- cycle;
                                draw[blue] plot[variable=x,domain=0:360,smooth,samples=51]
                                ({R*cos(x)},{R*sin(x)},HW);
                                % "invisible" lined
                                draw[dashed] plot[variable=x,domain=180:360,smooth]
                                ({R*cos(x)},{R*sin(x)},0);
                                % visible cylinder lines
                                draw plot[variable=x,domain=0:180,smooth]
                                ({R*cos(x)},{R*sin(x)},0)
                                --
                                plot[variable=x,domain=180:360,smooth]
                                ({R*cos(x)},{R*sin(x)},HC) -- cycle;
                                draw plot[variable=x,domain=0:180,smooth]
                                ({R*cos(x)},{R*sin(x)},HC);
                                end{tikzpicture}
                                end{document}


                                enter image description here



                                The meaning of the view angle is illustrated by this animation.



                                documentclass[tikz,border=3.14mm]{standalone}
                                usepackage{tikz-3dplot}
                                usepgflibrary{shapes.geometric}
                                usetikzlibrary{calc}
                                begin{document}
                                foreach X in {0,10,...,350}
                                {tdplotsetmaincoords{120+30*sin(X)}{0}
                                begin{tikzpicture}
                                pgfmathsetmacro{R}{4}
                                pgfmathsetmacro{HW}{4}
                                pgfmathsetmacro{HC}{6}
                                path[use as bounding box] (-1.1*R,-0.75*HC) rectangle (1.1*R,1.25*HC);
                                begin{scope}[tdplot_main_coords]
                                % water
                                fill[blue!40] plot[variable=x,domain=0:180,smooth] ({R*cos(x)},{R*sin(x)},0)
                                --
                                plot[variable=x,domain=180:360,smooth] ({R*cos(x)},{R*sin(x)},HW)
                                -- cycle;
                                draw[blue] plot[variable=x,domain=0:360,smooth,samples=51]
                                ({R*cos(x)},{R*sin(x)},HW);
                                % "invisible" lined
                                draw[dashed] plot[variable=x,domain=180:360,smooth]
                                ({R*cos(x)},{R*sin(x)},0);
                                % visible cylinder lines
                                draw plot[variable=x,domain=0:180,smooth]
                                ({R*cos(x)},{R*sin(x)},0)
                                --
                                plot[variable=x,domain=180:360,smooth]
                                ({R*cos(x)},{R*sin(x)},HC) -- cycle;
                                draw plot[variable=x,domain=0:180,smooth]
                                ({R*cos(x)},{R*sin(x)},HC);
                                end{scope}
                                end{tikzpicture}}
                                end{document}


                                enter image description here






                                share|improve this answer



























                                  up vote
                                  2
                                  down vote













                                  I would use tikz-3dplot for it, in particular if you are considering adding more 3d-like elements. The following has 4 parameters, one view angle which is set to 100, a radius R, the height of the water HW and the height of the cylinder HC.



                                  documentclass[tikz,border=3.14mm]{standalone}
                                  usepackage{tikz-3dplot}
                                  usepgflibrary{shapes.geometric}
                                  usetikzlibrary{calc}
                                  begin{document}
                                  tdplotsetmaincoords{100}{0}
                                  begin{tikzpicture}[tdplot_main_coords]
                                  pgfmathsetmacro{R}{4}
                                  pgfmathsetmacro{HW}{4}
                                  pgfmathsetmacro{HC}{6}
                                  % water
                                  fill[blue!40] plot[variable=x,domain=0:180,smooth] ({R*cos(x)},{R*sin(x)},0)
                                  --
                                  plot[variable=x,domain=180:360,smooth] ({R*cos(x)},{R*sin(x)},HW)
                                  -- cycle;
                                  draw[blue] plot[variable=x,domain=0:360,smooth,samples=51]
                                  ({R*cos(x)},{R*sin(x)},HW);
                                  % "invisible" lined
                                  draw[dashed] plot[variable=x,domain=180:360,smooth]
                                  ({R*cos(x)},{R*sin(x)},0);
                                  % visible cylinder lines
                                  draw plot[variable=x,domain=0:180,smooth]
                                  ({R*cos(x)},{R*sin(x)},0)
                                  --
                                  plot[variable=x,domain=180:360,smooth]
                                  ({R*cos(x)},{R*sin(x)},HC) -- cycle;
                                  draw plot[variable=x,domain=0:180,smooth]
                                  ({R*cos(x)},{R*sin(x)},HC);
                                  end{tikzpicture}
                                  end{document}


                                  enter image description here



                                  The meaning of the view angle is illustrated by this animation.



                                  documentclass[tikz,border=3.14mm]{standalone}
                                  usepackage{tikz-3dplot}
                                  usepgflibrary{shapes.geometric}
                                  usetikzlibrary{calc}
                                  begin{document}
                                  foreach X in {0,10,...,350}
                                  {tdplotsetmaincoords{120+30*sin(X)}{0}
                                  begin{tikzpicture}
                                  pgfmathsetmacro{R}{4}
                                  pgfmathsetmacro{HW}{4}
                                  pgfmathsetmacro{HC}{6}
                                  path[use as bounding box] (-1.1*R,-0.75*HC) rectangle (1.1*R,1.25*HC);
                                  begin{scope}[tdplot_main_coords]
                                  % water
                                  fill[blue!40] plot[variable=x,domain=0:180,smooth] ({R*cos(x)},{R*sin(x)},0)
                                  --
                                  plot[variable=x,domain=180:360,smooth] ({R*cos(x)},{R*sin(x)},HW)
                                  -- cycle;
                                  draw[blue] plot[variable=x,domain=0:360,smooth,samples=51]
                                  ({R*cos(x)},{R*sin(x)},HW);
                                  % "invisible" lined
                                  draw[dashed] plot[variable=x,domain=180:360,smooth]
                                  ({R*cos(x)},{R*sin(x)},0);
                                  % visible cylinder lines
                                  draw plot[variable=x,domain=0:180,smooth]
                                  ({R*cos(x)},{R*sin(x)},0)
                                  --
                                  plot[variable=x,domain=180:360,smooth]
                                  ({R*cos(x)},{R*sin(x)},HC) -- cycle;
                                  draw plot[variable=x,domain=0:180,smooth]
                                  ({R*cos(x)},{R*sin(x)},HC);
                                  end{scope}
                                  end{tikzpicture}}
                                  end{document}


                                  enter image description here






                                  share|improve this answer

























                                    up vote
                                    2
                                    down vote










                                    up vote
                                    2
                                    down vote









                                    I would use tikz-3dplot for it, in particular if you are considering adding more 3d-like elements. The following has 4 parameters, one view angle which is set to 100, a radius R, the height of the water HW and the height of the cylinder HC.



                                    documentclass[tikz,border=3.14mm]{standalone}
                                    usepackage{tikz-3dplot}
                                    usepgflibrary{shapes.geometric}
                                    usetikzlibrary{calc}
                                    begin{document}
                                    tdplotsetmaincoords{100}{0}
                                    begin{tikzpicture}[tdplot_main_coords]
                                    pgfmathsetmacro{R}{4}
                                    pgfmathsetmacro{HW}{4}
                                    pgfmathsetmacro{HC}{6}
                                    % water
                                    fill[blue!40] plot[variable=x,domain=0:180,smooth] ({R*cos(x)},{R*sin(x)},0)
                                    --
                                    plot[variable=x,domain=180:360,smooth] ({R*cos(x)},{R*sin(x)},HW)
                                    -- cycle;
                                    draw[blue] plot[variable=x,domain=0:360,smooth,samples=51]
                                    ({R*cos(x)},{R*sin(x)},HW);
                                    % "invisible" lined
                                    draw[dashed] plot[variable=x,domain=180:360,smooth]
                                    ({R*cos(x)},{R*sin(x)},0);
                                    % visible cylinder lines
                                    draw plot[variable=x,domain=0:180,smooth]
                                    ({R*cos(x)},{R*sin(x)},0)
                                    --
                                    plot[variable=x,domain=180:360,smooth]
                                    ({R*cos(x)},{R*sin(x)},HC) -- cycle;
                                    draw plot[variable=x,domain=0:180,smooth]
                                    ({R*cos(x)},{R*sin(x)},HC);
                                    end{tikzpicture}
                                    end{document}


                                    enter image description here



                                    The meaning of the view angle is illustrated by this animation.



                                    documentclass[tikz,border=3.14mm]{standalone}
                                    usepackage{tikz-3dplot}
                                    usepgflibrary{shapes.geometric}
                                    usetikzlibrary{calc}
                                    begin{document}
                                    foreach X in {0,10,...,350}
                                    {tdplotsetmaincoords{120+30*sin(X)}{0}
                                    begin{tikzpicture}
                                    pgfmathsetmacro{R}{4}
                                    pgfmathsetmacro{HW}{4}
                                    pgfmathsetmacro{HC}{6}
                                    path[use as bounding box] (-1.1*R,-0.75*HC) rectangle (1.1*R,1.25*HC);
                                    begin{scope}[tdplot_main_coords]
                                    % water
                                    fill[blue!40] plot[variable=x,domain=0:180,smooth] ({R*cos(x)},{R*sin(x)},0)
                                    --
                                    plot[variable=x,domain=180:360,smooth] ({R*cos(x)},{R*sin(x)},HW)
                                    -- cycle;
                                    draw[blue] plot[variable=x,domain=0:360,smooth,samples=51]
                                    ({R*cos(x)},{R*sin(x)},HW);
                                    % "invisible" lined
                                    draw[dashed] plot[variable=x,domain=180:360,smooth]
                                    ({R*cos(x)},{R*sin(x)},0);
                                    % visible cylinder lines
                                    draw plot[variable=x,domain=0:180,smooth]
                                    ({R*cos(x)},{R*sin(x)},0)
                                    --
                                    plot[variable=x,domain=180:360,smooth]
                                    ({R*cos(x)},{R*sin(x)},HC) -- cycle;
                                    draw plot[variable=x,domain=0:180,smooth]
                                    ({R*cos(x)},{R*sin(x)},HC);
                                    end{scope}
                                    end{tikzpicture}}
                                    end{document}


                                    enter image description here






                                    share|improve this answer














                                    I would use tikz-3dplot for it, in particular if you are considering adding more 3d-like elements. The following has 4 parameters, one view angle which is set to 100, a radius R, the height of the water HW and the height of the cylinder HC.



                                    documentclass[tikz,border=3.14mm]{standalone}
                                    usepackage{tikz-3dplot}
                                    usepgflibrary{shapes.geometric}
                                    usetikzlibrary{calc}
                                    begin{document}
                                    tdplotsetmaincoords{100}{0}
                                    begin{tikzpicture}[tdplot_main_coords]
                                    pgfmathsetmacro{R}{4}
                                    pgfmathsetmacro{HW}{4}
                                    pgfmathsetmacro{HC}{6}
                                    % water
                                    fill[blue!40] plot[variable=x,domain=0:180,smooth] ({R*cos(x)},{R*sin(x)},0)
                                    --
                                    plot[variable=x,domain=180:360,smooth] ({R*cos(x)},{R*sin(x)},HW)
                                    -- cycle;
                                    draw[blue] plot[variable=x,domain=0:360,smooth,samples=51]
                                    ({R*cos(x)},{R*sin(x)},HW);
                                    % "invisible" lined
                                    draw[dashed] plot[variable=x,domain=180:360,smooth]
                                    ({R*cos(x)},{R*sin(x)},0);
                                    % visible cylinder lines
                                    draw plot[variable=x,domain=0:180,smooth]
                                    ({R*cos(x)},{R*sin(x)},0)
                                    --
                                    plot[variable=x,domain=180:360,smooth]
                                    ({R*cos(x)},{R*sin(x)},HC) -- cycle;
                                    draw plot[variable=x,domain=0:180,smooth]
                                    ({R*cos(x)},{R*sin(x)},HC);
                                    end{tikzpicture}
                                    end{document}


                                    enter image description here



                                    The meaning of the view angle is illustrated by this animation.



                                    documentclass[tikz,border=3.14mm]{standalone}
                                    usepackage{tikz-3dplot}
                                    usepgflibrary{shapes.geometric}
                                    usetikzlibrary{calc}
                                    begin{document}
                                    foreach X in {0,10,...,350}
                                    {tdplotsetmaincoords{120+30*sin(X)}{0}
                                    begin{tikzpicture}
                                    pgfmathsetmacro{R}{4}
                                    pgfmathsetmacro{HW}{4}
                                    pgfmathsetmacro{HC}{6}
                                    path[use as bounding box] (-1.1*R,-0.75*HC) rectangle (1.1*R,1.25*HC);
                                    begin{scope}[tdplot_main_coords]
                                    % water
                                    fill[blue!40] plot[variable=x,domain=0:180,smooth] ({R*cos(x)},{R*sin(x)},0)
                                    --
                                    plot[variable=x,domain=180:360,smooth] ({R*cos(x)},{R*sin(x)},HW)
                                    -- cycle;
                                    draw[blue] plot[variable=x,domain=0:360,smooth,samples=51]
                                    ({R*cos(x)},{R*sin(x)},HW);
                                    % "invisible" lined
                                    draw[dashed] plot[variable=x,domain=180:360,smooth]
                                    ({R*cos(x)},{R*sin(x)},0);
                                    % visible cylinder lines
                                    draw plot[variable=x,domain=0:180,smooth]
                                    ({R*cos(x)},{R*sin(x)},0)
                                    --
                                    plot[variable=x,domain=180:360,smooth]
                                    ({R*cos(x)},{R*sin(x)},HC) -- cycle;
                                    draw plot[variable=x,domain=0:180,smooth]
                                    ({R*cos(x)},{R*sin(x)},HC);
                                    end{scope}
                                    end{tikzpicture}}
                                    end{document}


                                    enter image description here







                                    share|improve this answer














                                    share|improve this answer



                                    share|improve this answer








                                    edited 1 hour ago

























                                    answered 1 hour ago









                                    marmot

                                    79.9k491171




                                    79.9k491171






























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