Re: [Maxima-discuss] explit plotting in wxdraw2d

[Evan C. <eva...@gm...>]

Hey, thanks. I wasn't even aware of that as an option. [Apparently, 
reading *all* of the documentation might help.]

On 2/13/2017 4:40 PM, Gunter Königsmann wrote:
> I always use parametric() for this purpose:
>
> wxdraw2d(parametric(5,y,y,0,10));
>
> Am 13. Februar 2017 22:09:10 MEZ schrieb Eric Barth <ej...@gm...>:
>
>     Here's another way that may or may not be simpler than your polygon
>
>     wxdraw2d(points_joined=true,point_type=0, line_width=3,
>         points([[1,1],[1,4]]),
>         xrange=[-2,2],yrange=[0,5]);
>
>     Eric
>
>     On Mon, Feb 13, 2017 at 3:52 PM Evan Cooch <eva...@gm...
>     <mailto:eva...@gm...>> wrote:
>
>         For a variety of reasons, I need to be able to plot a vertical
>         line, wrt
>         to the horizontal axis, in a plot. For the life of me, I'm not
>         sure how
>         to do this using wxdraw2d (or if its even possible). Suppose I
>         want a
>         simply x-y plot, with a horizontal line at y=200 over all x, and a
>         vertical line at x=100 over all y.
>
>         First, I call a few things, and set some defaults:
>
>         load("draw")$
>
>         set_draw_defaults(
>                grid=true,
>                xaxis = true, yaxis = true,
>                  xaxis_type = solid, yaxis_type = solid,
>                proportional_axes=xy)$
>
>         wxplot_size: [250, 250] $
>
>         wxdraw2d(x_voxel = 100,
>             y_voxel = 100,
>             line_width=2,color="black",
>             explicit(200,x,0,250), /* horizontal line */
>             explicit(100,y,0,250)); /* vertical */;
>
>
>         But, this doesn't work. It seems that explicit within wxdraw2d
>         must be a
>         function in x.If thats the case, then how the heck would you
>         ever draw
>         something like...x=100 over all y? In other words, a vertical
>         reference
>         line? The only way I could 'get something to work' seems like
>         a kludge
>         -- using polygon:
>
>         wxdraw2d(
>             line_width=2,color="black",
>             explicit(200,x,0,250), /* horizontal line */
>             polygon([100,100],[0,250])); /* vertical */;
>
>         Does the trick but...is there a better way that I'm missing?
>
>         Thanks!
>
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