plotting - ParametricPlot and PlotLegends don't seem to cooperate

Bug introduced in 9.0.1 -- fixed in 10.0.0?

I noted that only part of the legend shows up in ParametricPlot using v9's PlotLegends:

ParametricPlot[{{t, t}, {t, 2 t}}, {t, 0, 1}, PlotLegends -> LineLegend[{1, 2}]]

Mathematica graphics

Inspecting the figure's FullForm gets me (among other things)

LineLegend[
 List[
   Directive[EdgeForm[GrayLevel[0.5`]], Hue[0.9060679774997897`, 0.6`, 0.6`]]
 ], List[1, 2], 
 Rule[LegendLayout, "Column"]]

It looks like Mathematica forgot to add the second color. Adding the color manually gets me the full legend. This looks like a bug, but perhaps I'm missing something?

I also noticed that virtually all examples in the "Options/PlotLegends" section of the ParametricPlot doc page yield a result differing from the pre-rendered image. Again, this looks like a bug, perhaps introduced by a last-minute addition. I'm using v9.0.1. Anyone with v9.0.0 care to check whether it exists there as well?

Answer

The work-around posted by rcollyer can readily be generalized to work for an arbitrary number of parametric functions.

With[{funcList = {{t, t}, {t, 2 t}, {t, t/2}}},
  With[{n = Length@funcList}, 
    Legended[ParametricPlot[funcList, {t, 0, 1}], 
      LineLegend[(ColorData[1][#])& /@ #, #]& @ Range @ n]]]

enter image description here

Comments

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