Btukfyl

I am drawing a plot with some legends. It seems the legend markers will always have lines through them since I have to use Joined->True for this plot. The legend markers also seem to be always larger than those in the plot. My question is, is it possible to get rid of those lines through the legend markers and also make the legend markers smaller? Besides, is there a way to remove the grey outlines around the legend markers?

The code I used for this plot is

ListPlot[{{1, 2, 3, 4, 5}, (1/2) {1, 2, 3, 4, 5}}, Joined -> True, 

 PlotStyle -> {{Blue, Dashed, AbsoluteThickness[1]}, {Red, Dashed, 

    AbsoluteThickness[1]}}, 

 PlotMarkers -> {{Graphics@{Disk}, 0.04}, {Graphics@{Rectangle}, 

    0.04}}, InterpolationOrder -> 1, 

 Frame -> {{True, False}, {True, False}}, 

 PlotLegends -> 

  Placed[PointLegend[

    Automatic, {Style["Series 1", FontFamily -> "Times New Roman", 

      FontSize -> 9, ScriptMinSize -> 6], 

     Style["Series 2", FontFamily -> "Times New Roman", FontSize -> 9,

       ScriptMinSize -> 6]}], {0.3, 0.8}], ImageSize -> 240]

This is just an answer for your last question. You can get rid of the border of your markers in the legend by specifying EdgeForm[None], e.g.:

ListPlot[

    {{1,2,3,4,5}, (1/2) {1,2,3,4,5}},

    Joined->True,

    PlotStyle->{

        {Blue,Dashed,AbsoluteThickness[1]},

        {Red,Dashed,AbsoluteThickness[1]}

    },

    PlotMarkers->{

        {Graphics@{EdgeForm[None],Disk},0.04},

        {Graphics@{EdgeForm[None],Rectangle},0.04}

    },

    InterpolationOrder->1,

    Frame->{{True,False},{True,False}},

    PlotLegends->Placed[

        PointLegend[

            Automatic,

            {

            Style["Series 1",FontFamily->"Times New Roman",FontSize->9,ScriptMinSize->6],

            Style["Series 2",FontFamily->"Times New Roman",FontSize->9,ScriptMinSize->6]

            }

        ],

        {0.3,0.8}

    ],

    ImageSize->240

]

Here is a work around.

Show[ListPlot[{{1, 2, 3, 4, 5}, (1/2) {1, 2, 3, 4, 5}}, 

  PlotStyle -> {Blue, Red}, 

  PlotMarkers -> {{Graphics@{EdgeForm[None], Disk}, 

     0.04}, {Graphics@{EdgeForm[None], Rectangle}, 0.04}}, 

  Frame -> {{True, False}, {True, False}}, 

  PlotLegends -> 

   Placed[

    PointLegend[

     Automatic, {Style["Series 1", FontFamily -> "Times New Roman", 

       FontSize -> 9, ScriptMinSize -> 6], 

      Style["Series 2", FontFamily -> "Times New Roman", 

       FontSize -> 9, ScriptMinSize -> 6]}], {0.3, 0.8}], 

  ImageSize -> 240], 

 ListLinePlot[{{1, 2, 3, 4, 5}, (1/2) {1, 2, 3, 4, 5}}, 

  PlotStyle -> {{Blue, Dashed, AbsoluteThickness[1]}, {Red, Dashed, 

     AbsoluteThickness[1]}}]]

Just add the options Joined -> False and BaseStyle -> EdgeForm to PointLegend in your code to get

If you don't like the red syntax highlighting of BaseStyle -> EdgeForm you can use Method -> { BaseStyle -> EdgeForm}.

Define a standalone legend:

legend = PointLegend[{Red, Blue},

          {Style["Series 1", FontFamily -> "Times New Roman", FontSize -> 9, ScriptMinSize -> 6], 

           Style["Series 2", FontFamily -> "Times New Roman", FontSize -> 9, ScriptMinSize -> 6]}, 

          LegendMarkers -> {{Graphics@{EdgeForm[None], Disk}, 0.04}, 

                            {Graphics@{EdgeForm[None], Rectangle}, 0.04}}]

Unfortunately, adding PlotLegends -> Placed[legend, {0.3, 0.8}] doesn't work:

plot2 = ListPlot[{{1, 2, 3, 4, 5}, (1/2) {1, 2, 3, 4, 5}}, 

  Joined -> True, 

  PlotStyle -> {{Blue, Dashed, AbsoluteThickness[1]}, {Red, Dashed, 

     AbsoluteThickness[1]}}, 

  PlotMarkers -> {{Graphics@{Disk}, 0.04}, {Graphics@{Rectangle}, 

     0.04}}, InterpolationOrder -> 1, 

  Frame -> {{True, False}, {True, False}}, 

  PlotLegends -> Placed[legend, {0.3, 0.8}], ImageSize -> 240]

However, Legended is a workaround:

plot3 = Legended[

  ListPlot[{{1, 2, 3, 4, 5}, (1/2) {1, 2, 3, 4, 5}}, Joined -> True, 

   PlotStyle -> {{Blue, Dashed, AbsoluteThickness[1]}, {Red, Dashed, 

      AbsoluteThickness[1]}}, 

   PlotMarkers -> {{Graphics@{Disk}, 0.04}, {Graphics@{Rectangle},

       0.04}}, InterpolationOrder -> 1, 

   Frame -> {{True, False}, {True, False}}, ImageSize -> 240], 

  Placed[legend, {0.3, 0.8}]]