Re: Is Orange translucent?

• To: mathgroup at smc.vnet.net
• Subject: [mg101304] Re: [mg101271] Is Orange translucent?
• From: Murray Eisenberg <murray at math.umass.edu>
• Date: Tue, 30 Jun 2009 06:36:46 -0400 (EDT)
• Organization: Mathematics & Statistics, Univ. of Mass./Amherst
• References: <200906290327.XAA11660@smc.vnet.net>
• Reply-to: murray at math.umass.edu

```I tried the following...

f[x_] := Piecewise[{{-1, x < 1}, {0, 1 <= x < 2}, {1, x >= 2}}]
Plot[f[x], {x, 0, 3}, PlotStyle -> {Thickness[0.01], Green}]
Plot[f[x], {x, 0, 3}, PlotStyle -> {Thickness[0.01], Orange}]

... in both cases, actually, with additional option ImageSize->8*72 so
that I could better see the effect. And yes, the x-axis and tick marks
do show through the green or orange segment of the function's graph.

But this looks perfectly attractive and informative to me: I would not
want to have the axis or the tick marks obscured.  If I were to insist
on obscuring the axes and tick marks, I would simply choose a very
intense, dark color such as Blue.

I don't know how one would determine whether the axes are drawn last,
since if you take the FullForm of the plot, the axes are represented
merely by an expression Rule[Axes,True].

AES wrote:
> I'm Plot[]ing two functions, using
>
>    PlotStyle->{{Thick, Blue}, {Thick, Orange}]
>
> Both functions run along on top of the x axis (i.e., have y(x)=0) for
> part of their range.
>
> In these regions, the black axis line shows through -- or on top of? --
> both curves.  The Blue curve is dark enough that you don't notice this;
> but with the Orange curve -- or maybe a Green one -- it looks terrible.
>
> Are the axes drawn before or after the curves?  (I can see arguments
> both ways on which of these ought to be the default.)
>
> Or are the Colors in the PlotStyle translucent?
>
> Any simple way to switch this behavior?
>

--
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305

```

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