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Re: Combining two paramteric plots into one.


Hi,

what may the option DisplayFunction->Identity do ?
Supress the output from a generated graphics ??

ellipsePlot[{xc_, yc_, w_, h_, a_}, n_] :=
    ParametricPlot[
      {ellipsePoint[{xc, yc, w, h, a}, 2\[Pi] t/n][[1]],
       ellipsePoint[{xc, yc, w, h, a}, 2\[Pi] t/n][[2]]},
      {t, 0, n},
       AspectRatio -> Automatic,DisplayFunction->Identity]

ellipsePlotTwo[{xc1_, yc1_, w1_, h1_, a1_},
               {xc2_, yc2_, w2_, h2_, a2_}] :=
    Show[
      ellipsePlot[{xc1, yc1, w1, h1, a1}],
      ellipsePlot[{xc2, yc2, w2, h2,
a2}],DisplayFunction->$DisplayFunction]

Regards
  Jens

Bob Harris wrote:
> 
> Howdy,
> 
> I'm trying to plot two ellipses together on one plot.  I have accomplished
> this, except that mathematica plots three figures-- ellipse 1, then ellipse
> 2, then the combination of the two.  I want to avoid the first two figures.
> 
> Here's what I am doing.
> 
> ellipsePoint[{xc_, yc_, w_, h_, a_}, t_] :=
>     {((w Cos[a] Cos[t] - h Sin[a] Sin[t]) + xc)/2,
>      ((w Sin[a] Cos[t] + h Cos[a] Sin[t]) + yc)/2}
> 
> ellipsePlot[{xc_, yc_, w_, h_, a_}] :=
>     ellipsePlot[{xc, yc, w, h, a}, 20]
> 
> ellipsePlot[{xc_, yc_, w_, h_, a_}, n_] :=
>     ParametricPlot[
>       {ellipsePoint[{xc, yc, w, h, a}, 2\[Pi] t/n][[1]],
>        ellipsePoint[{xc, yc, w, h, a}, 2\[Pi] t/n][[2]]},
>       {t, 0, n},
>       AspectRatio -> Automatic]
> 
> ellipsePlotTwo[{xc1_, yc1_, w1_, h1_, a1_},
>                {xc2_, yc2_, w2_, h2_, a2_}] :=
>     Show[
>       ellipsePlot[{xc1, yc1, w1, h1, a1}],
>       ellipsePlot[{xc2, yc2, w2, h2, a2}]]
> 
> Apparently what happens is ParametricPlot[...] always draws a figure so when
> I call it inside Show (via ellipsePlot[...]), I get a figure drawn that I
> don't want to draw yet.  How can I call ParametricPlot and just get the
> resulting graphical object without it drawing it?
> 
> I have similar problems with other combinations with ellipsePlot.  For
> example, using ListPlot to try to add a list of points on the figure (i.e.
> Show[ellipsePlot[...], ListPlot[...]]) I get three figures instead of just
> the one I want.
> 
> Thanks,
> Bob H


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